Answer:
The immune system uses white blood cells and antibodies to identify and eliminate organisms that get through the body's natural barriers.
Explanation:
When the immune system is weakened by the virus, the body is especially susceptible to infections by what are usually harmless pathogens because of the reduction of a specific group of T cells. Due to the lack of T cells, the immune system has difficulties properly coordinating the fight against the pathogens in the tissue. This is when white blood cells and antibodies begin their attack. Then the immune system can fight against the infection on all fronts.
White Blood Cell- a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell. There are several types, all amoebic cells with a nucleus, including lymphocytes, granulates, monocles, and macrophages.
Antibodies- a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.
How do polar molecules respond when they are placed between two metal plates one positively charged and one negatively charged ? A the molecules online and the electric field be the molecules joined together form in one large molecule see the molecules break apart as atoms migrate to the two plates d the molecule spin in circles
Answer:
The molecules align with the electric field
Explanation:
Polar molecules have dipoles (parts of the molecules have partial charges). This is because the atoms with a larger atomic mass attract more of the electron cloud of the molecule hence become partially electronegative. The other part of the molecule becomes partially positive. Therefore these parts of the molecule will align with opposite charges including in this case based on the charged metal plates. The positive dipole will align with the negative plate while the negative dipoles will align with the positive plate.
Answer:
The molecules align to the electric field.
Explanation:
A polar molecule is one that is neutral, that is, it does not have a net charge. But it has an internal distribution of charges that form a partially positive region and a partially negative region.
Coulomb's law indicates that charged bodies suffer a force of attraction or repulsion when approaching. The value of this force is proportional to the product of the value of its loads. The force is of attraction if the charges are of opposite sign and of repulsion if they are of the same sign. The force is inversely proportional to the square of the distance that separates them.
Then, following Coulomb's Law, the negatively charged end of the polar molecule will be attracted to the positively charged metal plate. And the positively charged end of the polar molecule is attracted to the negatively charged metal plate.
Then, the molecules align to the electric field.
Carbon atoms have four valence electrons. Are they likely to react with other atoms?
Answer:
yes
Explanation:
because they can become more stable by doing so. ... Two or more atoms of different elements that are chemically bonded together are known as: Compounds 6.
pls make brainliest thx
Carbon atoms have four valence electrons and are likely to react with other atoms because they can become more stable by doing so.
What is an atom?An atom is any particle of matter at its most basic level which contains at least one proton.
The four valence electrons in a carbon atom can do this by forming four single bonds, or by forming two single bonds and a double bond, by forming one single bond and a triple bond, or by forming two double bonds.
Carbons covalently bond with one another, also, forming chains of various lengths, and rings.
Hence, carbon atoms have four valence electrons and are likely to react with other atoms because they can become more stable by doing so.
Learn more about an atom here:
https://brainly.com/question/1566330
#SPJ2
Leon uses a pressure gauge to measure the air pressure in one of his car tires. The gauge shows that the pressure is 220 kilopascals. The temperature is 297 K, and the outdoor air is at standard pressure. If the tire contains 4.8 moles of air, what is the volume of the tire? The volume of the car tire is __ liters.
To find the volume of Leon's tire, we use the Ideal Gas Law: PV = nRT. Given the pressure, temperature, and moles of air, we calculate the volume to be approximately 53.5 liters. Therefore, the tire's volume is 53.5 liters.
Leon uses a pressure gauge to measure the air pressure in one of his car tires. The gauge shows that the pressure is 220 kilopascals. The temperature is 297 K, and the outdoor air is at standard pressure. If the tire contains 4.8 moles of air, what is the volume of the tire? The volume of the car tire is liters.
To find the volume of the tire, we can use the Ideal Gas Law: PV = nRT.
Where:
P = Pressure = 220 kPa (220,000 Pa)V = Volume (what we are solving for)n = Number of moles = 4.8 molesR = Ideal Gas Constant = 8.314 J/(mol·K)T = Temperature = 297 KRearranging the Ideal Gas Law to solve for V, we get:
V = nRT / P
Substitute the known values:
V = (4.8 moles) * (8.314 J/(mol·K)) * (297 K) / (220,000 Pa)
V = 11.781 / 220
V ≈ 0.0535 m³
To convert cubic meters to liters: 0.0535 m³ * 1000 = 53.5 liters
Therefore, the volume of the car tire is approximately 53.5 liters.
Which is the noble gas notation for chlorine?
Answer:
[Ne] 3s² 3p⁵Explanation:
Chlorine's atomic number is 17.
That means that it has 17 protons and 17 electrons.
Then, you have to write the electron configuration for the 17 electrons.
The noble gas notation is a short notation that uses the previous noble gas symbol (closed in brackets) and adds the new electrons, filling the orbitals in increasing order of energy, which you can remember using Aufbau rules.
Then:
number of electrons: 17Previous noble gas: neon, which has 10 electrons.Then, you use [Ne] and add 17 - 10 = 7 more electrons.Since, the electron configuration of neon is 1 s² 2s² 2p⁶, the seven electrons that you have to add will occupy the orbitals 3s and 3p.Result: [Ne] 3s² 3p⁵ ← answer
What determines the types of chemical reactions that an atom participates in?
Answer:
The innermost electron shell of an atom can hold up to _____ electrons. ... What determines the types of chemical reactions that an atom participates in? the number of electrons in the outermost electron shell. Atoms with the same number of protons but with different electrical charges
The types of chemical reactions an atom can participate in are determined by its valence electrons, which are the outermost electrons in an atom. The atom's goal in a reaction is usually to achieve a stable structure, like a full or empty outer shell. The periodic table can also guide our understanding of an atom's reactive behaviour.
Explanation:The types of chemical reactions that an atom participates in are primarily determined by its electronic structure, specifically its valence electrons. These are the electrical charges contained in the outermost shell of an atom. Atoms generally strive to achieve a stable structure, which usually means filling up or emptying the outermost shell. Chemical reactions serve the purpose of reaching this stability. For instance, in a reaction between sodium (which wants to lose an electron) and chlorine (which wants to gain an electron) both atoms achieve a stable structure, forming sodium chloride, a common salt. Periodic table also provides useful information, as atoms in the same group (column) have similar chemical behaviours due to having the same number of valence electrons.
Learn more about Chemical Reactions here:https://brainly.com/question/34137415
#SPJ12
How many liters of water vapor can be produced if 108 grams of methane gas (CH4) are combusted at 312 K and 0.98 atm? Show all work. Pls help! WILL MARK AS BRAINLIEST
Answer:
Approximately 352 liters of water vapor will be produced.
Assumption: the water vapor here behaves like an ideal gas.
Explanation:
Relative atomic mass data from a modern periodic table:
Carbon: 12.011;Hydrogen: 1.008.Burning methane [tex]\rm CH_4[/tex] in excess oxygen will produce carbon dioxide and water. The balanced equation will be
[tex]\rm CH_4\; (g) + 2\; O_2\;(g) \to CO_2\;(g) + 2\; H_2O\;(g)[/tex].
Hint: start by assign "1" to methane while balancing this equation.
How many moles of molecules in 108 gram of methane?
Molar mass of methane:
[tex]M(\rm CH_4) = 12.011 + 4\time 1.008 =16.043\;g\cdot mol^{-1}[/tex].
[tex]\displaystyle n(\rm CH_4) = \frac{m}{M} = \frac{108}{16.043} = 6.73191\;mol[/tex].
How many moles of water molecules will be produced?
Consider the ratio between the coefficient in front of water and that in front of methane in the equation:
[tex]\displaystyle \frac{n(\mathrm{H_2O})}{n(\mathrm{CH_4})} = 2[/tex].
[tex]\displaystyle n(\mathrm{H_2O}) = n(\mathrm{CH_4})\cdot \frac{n(\mathrm{H_2O})}{n(\mathrm{CH_4})} = \rm 2\times 6.73191\;mol = 13.4638\;mol[/tex].
Assume that water vapor here behaves like an ideal gas.
Ideal gas constant in liters and [tex]\rm atm[/tex]:
[tex]R \rm \approx 0.0820573\;L\cdot atm \cdot K^{-1}\cdot mol^{-1}[/tex]. (NIST.)
Make sure that the temperature here is in degrees Kelvins.
[tex]\displaystyle \begin{aligned}V &= \frac{n\cdot R\cdot T}{P} \\ &= \rm \frac{13.4638\;mol\times 0.0820573\;L\cdot atm \cdot K^{-1}\cdot mol^{-1}\times 312\; K}{0.98\; atm}\\ &\rm \approx 352\; L\end{aligned}[/tex].
What is the enthalpy of reaction for the
decomposition of calcium carbonate?
CaCO3(s) → CaO(s) + CO2(g)
kJ
Answer:
[tex]\boxed{\text{656.3 kJ/mol}}[/tex]
Explanation:
The formula for calculating the enthalpy change of a reaction by using the enthalpies of formation of reactants and products is:
[tex]\Delta_{\text{r}}H^{\circ} = \sum \Delta_{\text{f}} H^{\circ} (\text{products}) - \sum\Delta_{\text{f}}H^{\circ} (\text{reactants})[/tex]
CaCO₃(s) ⟶ CaO(s) + CO₂(g)
ΔH°f/kJ·mol⁻¹: -1207.1 -157.3 -393.5
[tex]\begin{array}{rcl}\Delta_{\text{r}}H^{\circ} & = & [-157.3 + (-393.5)] - (-1207.1)\\& = & -550.8 +1207.1\\& = & \textbf{656.3 kJ/mol}\\\end{array}\\\\\text{The enthalpy of decomposition is } \boxed{\textbf{656.3 kJ/mol}}[/tex]
The enthalpy of decomposition is 656.3 KJ/mol.
Given that the enthalpy of decomposition is obtained from;
ΔHrxn = ∑ΔHf(products) - ∑ΔHf(reactants)
Now, the species involved in the reaction are;
ΔHf(CaO)(s)) = -157.3 KJ/mol
ΔHf((CO2)(g)) = -393.5 KJ/mol
ΔHf(CaCO3)(s)) = -1207.1 KJ/mol
Substituting values;
ΔHrxn = [(-393.5) + ( -157.3)] - ( -1207.1) KJ/mol
ΔHrxn =(( -550.8) + 1207.1) KJ/mol
ΔHrxn = 656.3 KJ/mol
Learn more: https://brainly.com/question/7827769
Which group on the periodic table is the most reactive
Answer:
Group 7 or the Halogens
Explanation:
The halogens occupies the 7th group on the periodic table. The group is made of F, Cl , Br, I and At.
The elements in this group are the most reactive of all elements. They are very reactive because they have just 7 electrons in their outermost shell and they only require an electron to complete their electronic configuration to produce an octet which typically mimics the stable group VIII elements.
This makes them very highly reactive.
Answer:
7
Explanation:
Where does carbon monoxide come from in a house?
Answer:
Most likely stoves and fire places.
Explanation:
Answer: carbon monoxide is found in fumes produced any time you burn fuel in cars or trucks, small engines, stoves, lanterns, grills, fireplaces, gas ranges, or furnaces.
Malia was able to make a paper clip float on the surface of water what will most likely happen to the paper clip if a drop of dishwashing detergent is added near it
which of the following correctly represents the second ionization of copper?a) Cu + (g) + e- ---> Cu2+ (g)-b)Cu (g) ---> Cu + (g) + e-c) Cu+ (g) ---> Cu2+ (g) + e-d) Cu - (g) + e- ---> Cu2- (g)e) Cu+ (g) + e- ---> Cu (g)
Answer:
c) Cu⁺(g)⟶ Cu²⁺(g) + e⁻
Explanation:
Ionization energy is the energy needed to remove a valence electron from a gaseous atom.
b) Cu(g) ⟶ Cu⁺(g) + e⁻ represents the first ionization energy, the energy needed to remove the first electron.
c) Cu⁺(g)⟶ Cu²⁺(g) + e⁻ represents the second ionization energy of Cu, the energy needed to remove the second electron after the first one is gone.
a) is wrong. The charge is not balanced.
d) is wrong. It represents the electron gain energy of a Cu⁻ ion (highly unlikely).
e) is wrong. It represents the electron gain energy of a Cu⁺ ion (the reverse of the first ionization energy).
The second ionization of copper, where copper(I) loses an extra electron to become copper(II), is correctly represented by the option c) Cu+ (g) → Cu2+ (g) + e-.
Explanation:The correct answer to the question of which of the following correctly represents the second ionization of copper is c) Cu+ (g) → Cu2+ (g) + e-. During the second ionization process, a copper(I) ion, also called a cuprous ion, loses an additional electron to become a copper(II) ion or cupric ion with a 2+ charge. This process can be observed in various redox reactions where copper transitions from a +1 oxidation state to a +2 oxidation state.
A 220.0 gram piece of copper is dropped into 500.0 grams of water 24.00 °C. If the final temperature of water is 42.00 °C, what was the initial temperature of the copper piece?
Specific heat of copper = 0.39 J/g °C
A. 436 °C
B. 456 °C
C. 481 °C
D. 487 °C
Answer:
C. 481 °C.
Explanation:
At equilibrium:The amount of heat absorbed by water = the amount of heat released by copper.
To find the amount of heat, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of energy.
m is the mass of substance.
c is the specific heat capacity.
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T).
∵ Q of copper = Q of water
∴ - (m.c.ΔT) of copper = (m.c.ΔT) of water
m of copper = 220.0 g, c of copper = 0.39 J/g °C, ΔT of copper = final T - initial T = 42.00 °C - initial T.
m of water = 500.0 g, c of water = 4.18 J/g °C, ΔT of water = final T - initial T = 42.00 °C - 24.00 °C = 18.00 °C.
∴ - (220.0 g)( 0.39 J/g °C)(42.00 °C - Ti) = (500.0 g)(4.18 J/g °C)(18.00 °C)
∴ - (85.8)(42.00 °C - Ti) = 37620.
∴ (42.00 °C - Ti) = 37620/(- 85.8) = - 438.5.
∴ Ti = 42.00 °C + 438.5 = 480.5°C ≅ 481°C.
So, the right choice is: C. 481 °C.
5) From an environmental perspective, it is important to ensure that radioactive materials are stored properly, because radioactive samples:
a) can be in liquid, solid or gas forms
b) once they are leaked into the environment, could cause serious health hazards to all living organisms
c) can remain radioactive for long periods of time
d) can do all of these
Answer:
once they are leaked into the environment, could cause serious health hazards to all living organisms
Answer:
can do all of these
Explanation:
A radioactive material may exist in any given state of matter; solid, liquid or gas. Some radioactive materials have very long half lives. Half life refers to the period of time it takes for the amount of radioactive material in a sample to decrease by half of its original content of radioactive material.
Most radioactive materials produce ionizing radiation which causes ill effects on human and animal cells.
Cameron is visiting a new country while traveling around the world. He is extremely fascinated by the cuisine of this country. He really enjoyed the traditional beef noodle soup known as pho. In fact, according to tradition, he was encouraged to participate in the seasoning of the dish. Which type of cuisine has Cameron tried?
Answer:
Vietnamese.
Correct for plato
According to avogadro's law, what is characteristic of 1 mole of gas at stp?
Answer:
1 mole of any gas has a volume of 22.4 at STP
Avogadro's law states 1 mole of any gas at standard temperature and pressure (STP) occupies a volume of 22.4 liters. This statement is applicable to all gases.
Explanation:According to Avogadro's law, one very important characteristic of 1 mole of gas at standard temperature and pressure (STP) is that it occupies a volume of 22.4 liters. This is applicable to any gas, regardless of the type. Avogadro's law states that equal volumes of different gases, at the same temperature and pressure, contain the same number of molecules. Therefore, irrespective of whether it is oxygen, hydrogen, or nitrogen, if you have 1 mole of gas at STP, it will occupy a volume of 22.4 liters.
Learn more about Avogadro's law here:https://brainly.com/question/4420851
#SPJ6
(a) Calculate the mass of CaCl2·6H2O needed to prepare 0.125 m CaCl2(aq) by using 500. g of water. (b) What mass of NiSO4·6H2O must be dissolved in 500. g of water to produce 0.22 m NiSO4(aq)?
Answer:
(a) 13.7 g.
(b) 28.91 g.
Explanation:
molality (m) is the no. of moles of solute dissolved in 1.0 kg of solvent.∴ m = (no. of moles of solute)/(mass of water (kg))
∴ m = (mass/molar mass of solute)/(mass of water (kg)).
(a) Calculate the mass of CaCl₂·6H₂O needed to prepare 0.125 m CaCl₂(aq) by using 500. g of water.
∵ m = (mass/molar mass of CaCl₂·6H₂O)/(mass of water (kg)).
m = 0.125 m, molar mass of CaCl₂·6H₂O = 219.0757 g/mol, mass of water = 500.0 g = 0.5 kg.
∴ 0.125 m = (mass of CaCl₂·6H₂O / 219.0757 g/mol)/(0.5 kg).
∴ mass of CaCl₂·6H₂O = (0.125 m)(219.0757 g/mol)(0.5 kg) = 13.7 g.
(b) What mass of NiSO₄·6H₂O must be dissolved in 500. g of water to produce 0.22 m NiSO₄(aq)?
∵ m = (mass/molar mass of NiSO₄·6H₂O)/(mass of water (kg)).
m = 0.22 m, molar mass of NiSO₄·6H₂O = 262.84 g/mol, mass of water = 500.0 g = 0.5 kg.
∴ 0.125 m = (mass of NiSO₄·6H₂O / 262.84 g/mol)/(0.5 kg).
∴ mass of NiSO₄·6H₂O = (0.22 m)(262.84 g/mol)(0.5 kg) = 28.91 g.
Final answer:
The answer provides a balanced chemical equation and guides through calculating the mass of Na2CO3 needed and finding the osmolarity of the solution after the reaction. It covers stoichiometry and solution concentration concepts.
Explanation:
(a) Balance the chemical equation:
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
(b) How many grams of Na2CO3 are needed:
Use the molarity and volume to find moles of Ca(NO3)2, then use the mole ratio to find moles of Na2CO3, and finally convert moles to grams.
(c) Find the osmolarity of the NaNO3 solution:
Since Na2CO3 doesn't affect volume significantly, find moles of Na2CO3 reacting, and use that to calculate the moles of NaNO3 left in the solution for osmolarity.
How would you prepare 2-methyl-2-propanol via a grignard with dimethyl carbonate as your carbonyl source? show all reagents?
Answer:
React it with CH₃MgBr and work up the product with saturated ammonium chloride solution
Explanation:
Grignard reagents convert esters into tertiary alcohols.
The general equation is
[tex]\text{RCOOR}' \xrightarrow[\text{2. H}^{+}]{\text{1. R$^{\prime \prime}$MgBr}}\text{RR$_{2}^{\prime \prime}$C-OH}[/tex]
The Grignard reagent in this synthesis is methylmagnesium bromide. You prepare it by reacting a solution methyl bromide in anhydrous ether with magnesium and a few crystals of iodine.
The reaction consumes 3 mol of CH₃MgBr per mole of dimethyl carbonate, and everything happens in the same pot.
Acid workup of the product usually involves the addition of a saturated aqueous solution of ammonium chloride and extraction with a low-boiling organic solvent.
The mechanism involves:
Step 1. Nucleophilic attack and loss of leaving group
(a) The Grignard reagent attacks the carbonyl of dimethyl carbonate, followed by (b) the loss of a methoxide leaving group.
Step 2. Nucleophilic attack and loss of leaving group
(a) A second mole of the Grignard reagent attacks the carbonyl of methyl acetate, followed by (b) the loss of a methoxide leaving group.
Step 3. Nucleophilic attack and protonation of the adduct.
(a) A third mole of the Grignard reagent attacks the carbonyl of acetone, followed by (b) protonation of the alkoxide to form 2-methylpropan-2-ol.
The Grignard reagent serves as a very important tool in the synthesis of many other compounds.
The Grignard reagent serves as a very important tool in the synthesis of many other compounds. Grignard reagent are used in the synthesis of alcohols, ethers etc.
All the reagents and compounds required for the synthesis of 2-methyl-2-propanol via a Grignard reagent with dimethyl carbonate are shown in the image attached to this answer.
Learn more about Grignard reagent: https://brainly.com/question/12978582
[01.07]what is the answer to the problem: 101 g + 25.01 g + 5.05 g? 131.06 g 131.1 g 131 g 130 g
Answer:
[tex]\boxed{\text{131 g}}[/tex]
Explanation:
When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.
That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.
[tex]\begin{array}{r|l}101.& \text{g}\\25. & \text{01 g}\\5. & \text{05 g} \\\mathbf{131.} & \text{06 g}\\\end{array}[/tex]
The measurement of 101 g has no digits after the decimal point, so you round off the answer to give no digits to the right of the decimal.
[tex]\text{The sum is }\boxed{\textbf{131 g}}[/tex]
Which would have a higher pH, a 0.1 M solution of a strong acid, or a weak acid? Why?
Answer:
0.1 M weak acid
Explanation:
The term pH simply means power of hydrogen which is basically a log (the exponent to base 10 of the concentration) of the concentration of the hydrogen ions.
Weak acids have a higher pH since their hydrogen concentration is lower than that of strong acids.
A radical is a group of atoms that remains bonded together and behaves as a single atom in a chemical reaction.
a. True
b. False
Answer:
A radical is a group of atoms that remains bonded together and behaves as a single atom in a chemical reaction. True (a.)
Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.
Answer:
3065.63 J = 3.066 kJ.
Explanation:
We can calculate the amount of heat (Q) needed to warm Fe using the relation:Q = m.c.ΔT,
where, Q is the amount of heat needed to warm Fe (Q = ??? J).
m is the mass of Fe (m = 125.0 g).
c is the specific heat capacity of Fe (c = 0.45 J/g.°C).
ΔT is the difference in T (ΔT = final temperature - initial temperature = 78.0°C - 23.5°C = 54.5°C).
∴ Q = m.c.ΔT = (125.0 g)(0.45 J/g.°C)(54.5°C) = 3065.63 J = 3.066 kJ.
What is the theoretical yield of carbon dioxide?
a)0.993 g
b)2.98 g
c)3.65 g
d)8.93 g
Answer:
Hey how are you all doing the answer is 8.93 g
Explanation:
The theoretical yield of carbon dioxide is 8.93 g
Before performing chemical reactions, it is helpful to know how much product will be produced with given quantities of reactants. This is known as the theoretical yield. This is a strategy to use when calculating the theoretical yield of a chemical reaction. The same strategy can be applied to determine the amount of each reagent needed to produce a desired amount of product.
Carbon dioxide (CO2) became the first gas that was distinguished from ordinary air. In 1630 or so, Jan Baptist van Helmont, a Flemish chemist, identified a vapor distinct from the air when he burned charcoal in a closed vessel. He then called the vapor “wood gas” (spiritus sylvestris). He thought that it was an element or a single substance.1 In 1756, Joseph Black, a Scottish physician, noticed this gas when heating calcium carbonate (CaCO3). He called it “fixed air”. He also identified it from exhaled breath and described it as denser than the air faintly acidic. In 1803, John Dalton (an English chemist) proposed that this substance is comprised of one carbon atom and two oxygen atoms. Now, it is called “carbon dioxide”.Carbon dioxide is a chemical compound made up of a carbon atom and two oxygen atoms. Each of the oxygen atoms is attached to the central carbon atom by a double covalent bond. The C-O bond has a length of 116.3 pm. The configuration of the compound is linear and centrosymmetric. Its chemical formula is CO2.Learn more about Carbon dioxide
https://brainly.com/question/13054663
#SPJ2
If an atom contains 11 protons and 12 neutrons, what is its mass number?
Answer: The mass number will be 23
Explanation: The mass number refers back to the number of protons and neutrons.
You are asked to make 43 grams of iron (Fe) from iron III oxide (Fe2O3) and carbon monoxide (CO) as shown in the chemical equation below.
Fe2O3 + 3CO → 2Fe + 3CO2
How many grams of iron III oxide must you use?
Question 10 options:
61.49 g
122.99 g
0.77 g
6863 g
To produce 43 grams of iron from the reaction Fe2O₃ + 3CO ightarrow 2Fe + 3CO₂, one would require approximately 61.48 grams of iron III oxide, following stoichiometry calculations based on molar masses and the balanced chemical equation.
To determine how many grams of iron III oxide (Fe₂O₃) are needed to make 43 grams of iron (Fe) using the reaction Fe₂O₃ + 3CO ightarrow 2Fe + 3CO₂, we will use the concept of stoichiometry. The molar mass of Fe is 55.85 grams per mole and the molar mass of Fe₂O₃ is approximately 159.69 grams per mole.
First, we need to determine the number of moles of iron that correspond to 43 grams:
Calculate moles of iron:
43 g Fe 1 mol Fe / 55.85 g Fe = 0.770 moles Fe.
Next, we use the stoichiometry of the reaction to find the moles of Fe₂O₃ needed. From the balanced equation, 1 mole of Fe₂O₃ produces 2 moles of Fe.
Calculate moles of Fe₂O₃:
0.770 moles Fe X (1 mol Fe2O3 / 2 mol Fe) = 0.385 moles Fe₂O₃.
Finally, convert the moles of Fe₂O₃ to grams:
0.385 moles Fe₂O₃ X 159.69 g Fe₂O₃/mol = 61.48 grams of Fe₂O₃ (rounded to two significant figures).
Therefore, to make 43 grams of iron, you must start with approximately 61.48 grams of iron III oxide.
Answer the following question: In a space shuttle, the CO2 that the crew exhales is removed from the air by a reaction within canisters of lithium hydroxide. On average, each astronaut exhales about 650 L of CO2 daily. What mass of water will be produced
when this amount reacts with LiOH? The other product of the reaction is
Li2CO3. When answering this question include the following:
Have both the unbalanced and balanced chemical equations.
Explain how to find the molar mass of the compounds.
Explain how the balanced chemical equation is used to find the ratio of moles (hint: step 3 in the video).
Explain how many significant figures your answer needs to have.
The numerical answer
Answer:
[tex]\boxed{\text{520 g H$_{2}$O}}[/tex]
Explanation:
(a) Unbalanced equation
[tex]\rm LiOH + CO$_{2} \longrightarrow \,$ Li$_{2}$CO$_{3}$ + H$_{2}$O[/tex]
(b) Balanced equation
[tex]\rm 2LiOH + CO$_{2} \longrightarrow \,$ Li$_{2}$CO$_{3}$ + H$_{2}$O[/tex]
(c) Molar masses
The only compound for which you need an atomic mass is water.
You look up the atomic masses of each element in the Periodic Table, multiply by their subscripts in the formula, and add.
[tex]\begin{array}{rcrcr}\text{2H} & = & 2 \times 1.008 & = & 2.02\\\text{1O} & = & 1 \times 16.00 & = & 16.00\\\text{H$_{2}$O} & = & & & \mathbf{18.02}\\\end{array}[/tex]
(d) Molar Ratio
You want to convert moles of carbon dioxide to moles of water.
The balanced equation tells you that the molar ratio is 1 mol H₂O:1 mol CO₂.
(e) Significant figures
The only measurement you are given is "about 650 L." That tells you that the trailing zero is not significant.
The volume has only two significant figures, so the mass of water can have only two significant figures.
Note: Intermediate calculations should carry at least one extra digit (a guard digit) to prevent cumulative round-off errors, answers to be reported must have the correct number of significant figures.
(f) The calculation
You don't give the temperature and pressure of the gas, so I shall assume STP (1 bar and 0 °C). At STP, the molar volume of a gas
is 22.71 L.
[tex]\text{Moles of CO$_{2}$} = \text{650 L CO$_{2}$} \times \dfrac{\text{1 mol CO$_{2}$}}{\text{22.71 L CO$_{2}$ }} = \text{28.6 mol CO$_{2}$}\\\\\text{Moles of H$_{2}$O} = \text{28.6 mol CO$_{2}$} \times \dfrac{\text{1 mol H$_{2}$O}}{\text{1 mol CO$_{2}$}} = \text{28.6 mol H$_{2}$O}\\\\\text{Mass of H$_{2}$O} = \text{28.6 mol H$_{2}$O} \times \dfrac{\text{18.02 g H$_{2}$O}}{\text{1 mol H$_{2}$O}} = \boxed{\textbf{520 g H$_{2}$O}}[/tex]
The mass of water produced when CO2 reacts with LiOH can be determined using the balanced chemical equation and the molar mass of the compounds.
Explanation:The unbalanced chemical equation for the reaction between carbon dioxide (CO2) and lithium hydroxide (LiOH) is:
CO2 + LiOH → H2O + Li2CO3
To find the molar mass of a compound, you add up the atomic masses of each element in the compound. The molar mass of CO2 can be calculated by adding the atomic masses of carbon (12.01 g/mol) and oxygen (16.00 g/mol).
The balanced chemical equation allows you to determine the ratio of moles of reactants and products. In this case, you can see that for every 1 mole of CO2 reacted, 1 mole of H2O is produced.
The answer needs to have the same number of significant figures as the given data, which is 3 significant figures. Therefore, the mass of water produced when 650 L of CO2 reacts with LiOH is 2.35 kg.
Learn more about Calculating the mass of water produced in a chemical reaction here:https://brainly.com/question/29699543
#SPJ3
Determine the internal energy change Δu of hydrogen, in kJ/kg, as it is heated from 500 to 700 K, using (a) the empirical specific heat equation as a function of temperature, (b) the value at the average temperature, and (c) the value at room temperature.
What are the three major branches of natural science?
• Earth and space science, life science, physical science
•Earth and space science, physical science, chemistry
•Physical science, life science, chemistry
•Life science, chemistry, physics
Answer:
• Earth and space science, life science, physical science is the correct answer.
Explanation:
natural science is the branch of science that deals with the study of natural events, based on experimental proof from research and experimentation.
The three major branches of natural science are
Earth and space science: is the study of the Earth, oceans, land, solar system and atmosphere. it covers all fields of the natural science that are associated with the Earth planet.
life science:The life sciences include the parts of science that include the scientific understanding of living organisms and life( plants, animals , microbes and human beings).
physical science:it deals with studies of non-livings things.
If one mole of rucl3·5h2o reacts with agno3 to produce two moles of agcl(s), how can the formula rucl3·5h2o be re-written to show the proper coordination sphere?
Answer:
The formula of the compound will be:[tex] [Ru(Cl)_1(H_2O)_5]Cl_2[/tex].
Explanation:
Coordination sphere is an array of ions or ligands around central atom or or an ion. Ions and ligands linked to central atom forms primary coordination sphere and ions or molecules linked to primary coordination sphere forms secondary coordination sphere.
Given: If one mole of [tex]RuCl_3.5H_2O[/tex] reacts with [tex]AgNO_3[/tex] to produce two moles of AgCl precipitate.
This means that in primary coordination sphere there is a 1 chloride ion and 5 water molecules. And remaining 2 chloride ions present in secondary sphere which are available to react with silver ions of silver nitrate solution.
This why on reaction with silver nitrate 2 molecules or silver chloride are formed.
[tex][Ru(Cl)_1(H_2O)_5]Cl_2+2AgNO_3(aq)\rightarrow 2 AgCl(s)+[Ru(Cl)_1(H_2O)_5](NO_3)_2(aq)[/tex]
The formula of the compound will be:[tex] [Ru(Cl)_1(H_2O)_5]Cl_2[/tex].
Final answer:
The proper coordination sphere in the formula RuCl3·5H2O, after reacting with AgNO3 to produce AgCl, is represented by [Ru(H2O)5Cl]Cl2·H2O, indicating one chloride in the sphere, two as counterions, and one water molecule of crystallization.
Explanation:
To rewrite the formula RuCl3·5H2O to show the proper coordination sphere, we need to understand the stoichiometry of the reaction with AgNO3. This compound reacts to form two moles of AgCl, which indicates that two chloride ions are involved in the precipitation reaction. Since only those chloride ions are directly involved in the reaction to form AgCl with AgNO3, they must be in the coordination sphere of the ruthenium complex. The water molecules are assumed to complete the coordination sphere. Therefore, the proper way to write the formula indicating the coordination sphere would be [Ru(H2O)5Cl]Cl2·H2O, showing one chloride in the coordination sphere and two chloride ions outside as counterions with one crystallization water molecule.
What is the number of moles of beryllium atoms in 36 g of be? 0.25 mol 4.0 mol 45.0 mol 320 mol?
Answer:
[tex]\boxed{\text {4.0 mol}}[/tex]
Explanation:
1 mol of Be = 9.012 g
[tex]\text{Moles of Be} = \text{36 g Be} \times \dfrac{\text{1 mol Be}}{\text{9.012 g Be}} = \text{4.0 mol Be}\\\\\text{There are }\boxed{\textbf{4.0 mol Be}} \text{ in 36 g of Be}[/tex]
Answer: Option (b) is the correct answer.
Explanation:
It is known that number of moles of a substance is equal to the given mass of the substance divided by its molar mass.
Mathematically, Number of moles = [tex]\frac{mass}{/text{\molar mass}}[/tex]
Molar mass of beryllium is 9 g/mol. Hence, putting the given values into the above formula as follows.
Number of moles = [tex]\frac{mass}{/text{\molar mass}}[/tex]
= [tex]\frac{36}{9 g/mol}[/tex]
= 4 moles
Thus, we can conclude that the number of moles present in 36 grams of Be are 4 moles.
What is one chemical reaction that begins with petroleum as a starting material
Answer:
Thermal decomposition or cracking
Explanation:
Petroleum is a mixture of hydrocarbons which are usually formed naturally. Petroleum undergo a host of chemical reactions. One of such is thermal decomposition or cracking.
Cracking is used in the petroleum industry to covert heavy fractions to more useful lighter ones.
When petroleum is subjected to high temperature and pressure, and in the presence of catalyst, the long chain type of petroleum will decompose into more useful smaller and lighter molecules.
Example is given below:
C₁₅H₃₂ → C₈H₁₈ + C₃H₆ + 2C₂H₄