3. How many electrons are present in 1.6 g of methane?
Answers
Answer:
They present 1 electron
I showed how to solve in the pic attached.
Related Questions
Blood serum is typically about 0.0044 M in K+ (aq). Calculate the mass of the potassium ions in 4,459. mL of blood serum. The molar mass of potassium is 39.10 g/mol
Answers
Answer:
0.767 g.
Explanation:
Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 L of the solution.
M = (no. of moles of K⁺)/(Volume of the solution (L).
∵ no. of moles of K⁺ = (mass/molar mass) of K⁺.
∴ M = (mass/molar mass) of K⁺/(Volume of the solution (L).
M = 0.0044 M.
Volume of the solution = 4459.0 mL = 4.459 L.
mass of K⁺ = ??? g.
molar mass of K⁺ = 39.01 g/mol.
∴ mass of K⁺ = (M)((molar mass of K⁺)(volume of the solution (L)) = (0.0044 M)(39.10 g/mol)(4.459 L) = 0.767 g.
How many atoms of fluorine are in each molecule of disulfur decafluoride?
10
5
2
15
Answers
Answer:
10
Explanation:
You can tell with the name of the molecule. Just remember that the prefix will tell you how many.
di = 2
deca = 10
The name of the molecule is
disulfur decaflouride
This means that there are 2 sulfur atoms and 10 flourine atoms.
To eliminate the other choices:
penta = 5
pentadeca = 15
How much potassium chlorate (KCIO3) must decompose in order to produce 150 grams of oxygen gas (O2)?
Potassium chlorate decomposes according to the following balanced equation:
2KCIO3 + heat → 2KCI+ 3O2
Answers
Answer:
765.95 grams.
Explanation:
2 moles of KClO3 produce 3 moles of oxygen.
Using molar masses:
2 * 122.545 g of KCLO3 produces 47.997 grams of oxygen.
47.997 g O2 is produced from 245.09 g KCLO3
150 g .......................................... 150 * 245.09 / 47.997
= 765.95 grams.
Which of these best describes an ionic bond?
Answers
Answer:
chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds
Explanation:
Certain types of organisms such as fireflies and anglerfish can produce light
through chemical reactions in a process called bioluminescence.
What kind of chemical reactions occur during bioluminescence?
O A) exothermic
OB) endothermic
OC) recomposition
OD) decomposition
Answers
Answer:
B
Explanation:
Explanation
What is insulin's structure?
a.quaternary
b.secondary
c.primary
d.tertiary
Answers
Insulin has a complex structure that involves primary, secondary, tertiary, and quaternary levels, with its three-dimensional tertiary structure being essential for its biological function.
Explanation:The structure of insulin can be described in terms of primary, secondary, tertiary, and quaternary levels. The primary structure refers to its amino acid sequence. Insulin exhibits a secondary structure through regions of alpha-helices and beta-sheets. The tertiary structure of insulin is its unique three-dimensional shape resulting from the folding of the protein, and is essential for its biological function. Finally, insulin may also exhibit a quaternary structure when two insulin monomers (A and B chains) come together, stabilized by disulfide bonds and other interactions, as seen in its storage form within the body.
A reaction occurs when one compound reacts and is broken down into different elements or simpler compounds.
Answers
Answer:
Decomposition Reaction
Explanation:
If you are referring to what type of reaction that occurred then the answer would be decomposition reaction.
This is a chemical reaction where one reactant is broken down into two or more products.
REACTANT → PRODUCT
AB → A + B
The products can be two or more elements or two or more compounds, depending on what was decomposed.
Answer:
decomposition on edg
Explanation:
what volume of 0.500 mol/L hydrochloric acid, HCI (aq) is required to react completely with 1.00 g of aluminum hydroxide, AI(OH)3 (s)?
Please help
Answers
To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), use the balanced chemical equation and stoichiometry. The equation is AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l). Convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl.
Explanation:To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), we need to use the balanced chemical equation for the reaction and the stoichiometry of the reaction.
The balanced chemical equation is: AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l)
From the equation, we can see that 1 mole of AI(OH)3 reacts with 3 moles of HCl. Given that the concentration of HCl is 0.500 mol/L, we can convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl:
Calculate the moles of AI(OH)3: 1.00 g AI(OH)3 * (1 mol AI(OH)3 / molar mass AI(OH)3)Use the mole ratio to find the moles of HCl: moles AI(OH)3 * (3 moles HCl / 1 mole AI(OH)3)Convert moles of HCl to volume using the concentration: moles HCl * (1 L / 0.500 mol)Plug in the values above to calculate the volume of HCl required.
Which of the following is an indication that a substance has undergone a chemical change?
A.
No new product has been formed.
B.
The color of the substance has not changed.
C.
The original constitute has not changed.
D.
The molecular structure has changed.
Answers
A change in the molecular structure is an indication that a substance has undergone a chemical change. Hence, option D is correct.
What is molecular structure?Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule.
Some signs of a chemical change are a change in colour and the formation of bubbles.
The five conditions of chemical change: colour change, formation of a precipitate, formation of a gas, odour change, temperature change or change in molecular structure.
Hence, option D is correct.
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name a brittle metal , which is used to galvanize iron
Answers
Answer:
ZINC(zn) is used as the coating layer for the iron and as well as for all ferrous materials in galvanization/galvanizing process which defined as given below.
Explanation:
Answer:
zinc
Explanation:
when the pressure that a gas exerts on a sealed container changes from ____ atm to 2.64 atm, the temperature changes from 315 K to 475 K
Answers
Answer:
1.75 atm
Explanation:
When the pressure that a gas exerts on a sealed container changes from 1.75 atm to 2.64 atm, the temperature changes from 315 K to 475 K.
(2.64 atm) x (315 K / 475 K) = 1.75 atm
The pressure and temperature of a gas in a sealed container are directly proportional. An increase in temperature would imply that the pressure also increased.
Answer:1.75 atm
Explanation:
In a closed system, increase in pressure leads to increase in temperature. Using pressure law, P1/T1 = P2/T2
Data =
P1 =?
P2 = 2.64 atm
T1 = 315k
T2 = 475k
From the equation above,
P1 = P2 * T1 / T2
P1 = 2.64*315 / 475
P2 = 1.75 atm
Four statements about the development of the atomic model are shown below.
A: Electrons have wavelike properties.
B: Atoms have small, negatively charged particles.
C. The center of an atom is a small, dense nucleus.
D: Atoms are hard, indivisible spheres.
Which order of statements represents the historical development of the atomic model?
C-D-A-B
C-D-B-A
D— В-А — С
D-B-C-A
Answers
Answer:
D-B-C-A
Explanation:
D: Atoms are hard, indivisible spheres — John Dalton: Atomic theory (1803)
B: Atoms have small, negatively charged particles — J. J. Thomson: cathode rays (1897)
C. The center of an atom is a small, dense nucleus — Lord Rutherford: gold foil experiment (1909)
A: Electrons have wavelike properties — Niels Bohr: Bohr model (1913)
The development of the idea of atoms passed through various stages.
The history of the development of the atomic theory passed through several stages. Each stage in the development of atomic theory was backed by empirical evidence. The theory was jettisoned only when more compelling evidence suggests that the current model is inaccurate.
The order of development of atomic theory is shown below;
Atoms are hard, indivisible spheres.Atoms have small, negatively charged particles.The center of an atom is a small, dense nucleus. Electrons have wavelike properties.Learn more: https://brainly.com/question/24775418
If the price of gasoline is $3.85 per US gallon, what is the cost per liter? (1 L =1.06 qt)
Answers
If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.
What are volume units?Volume is used for the measurement of capacity. Thus the unit for measuring volume is basically a unit for measuring the capacity or the extent of space in an object. A unit is used to indicate the volume of goods or liquids. It should be kept in mind that mass and volume are two different physical quantities.
The SI Unit for volume is measured in cubic metres or m^3. Here the three-dimensional use of the base unit of length is used which is metres.
1 m^3 = 1 m • 1 m • 1 m.
The metric unit for volume is the litre and is widely used. Also, there are standard metric prefixes which are used for highlighting large or small volume measures. These are millilitre (ml) which is also used as a unit for measuring volume.
Few other units are used to depict the volume. These are the British system of measurements like barrels, drams, gills, bushels, and pecks. In the British system, more standard units used are the cubic inch or cubic foot and the gallon.
Therefore, If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.
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Final answer:
To convert the price of gasoline from $3.85 per US gallon to the cost per liter, divide $3.85 by 3.78541, which results in approximately $1.017 per liter.
Explanation:
If the price of gasoline is $3.85 per US gallon, we need to convert this to the cost per liter. Since 1 US gallon is equivalent to 3.78541 liters, we divide $3.85 by 3.78541 to get the price per liter.
The calculation is as follows:
$3.85 per gallon ÷ 3.78541 liters per gallon = approximately $1.017 per liter.
Therefore, the cost of gasoline is roughly $1.017 per liter.
Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.
Answers
Answer:
1- Equilibrium determines the rate of reactants and products at the same time.
General expression for equilibrium:
Reactants⇌ Products
2- At equilibrium, all the reactants and products are constant.
3- At equilibrium forward and reverse reaction does not stop, in fact, it continues at all times.
4- When the concentrations of reactants and products become equal dynamic equilibrium is obtained.
For example:
A + B ⇌ C + D
In this reaction, if the concentration of reactant A has increased the equilibrium will shift to the right to form more products.
If the concentration of reactant A has decreased the equilibrium will shift to the left in the backward direction to form reactants.
Answer:At equilibrium, the forward and backward reaction rate is the same.
Explanation:The equilibrium counteracts any change in the condition of the reactant or product. The le'chatalier principle highlights three main factors that affect the state of equilibrium. The three factors are: amount of moles, concentration and pressure.If the amount of reactant is increased, the equilibrium will shift to the right in order to create a balance between the forward and backward reaction and vice versa.
1. Combine iron and copper (II) sulfate solution. (Hint: Iron will form the iron (III) ion)
Fe + CuSO4 →
2. Combine lead (II) nitrate and potassium iodide solutions.
Pb(NO3)2+ Kl →
3. Combine magnesium metal and hydrochloric acid solution.
Mg + HCl →
4. Electrolysis (splitting) of water.
H2O →
5. Burning magnesium.
Mg + O2 →
Answers
Answer:
1. 2Fe + 3CuSO₄ → Fe₂(SO₄)₃ + 3Cu.
2. Pb(NO₃)₂+ 2Kl → PbI₂ + 2KNO₃.
3. Mg + 2HCl → MgCl₂ + H₂.
4. H₂O → H₂ + 1/2O₂.
5. 2Mg + O₂ → 2MgO.
Explanation:
1. Combine iron and copper (II) sulfate solution. (Hint: Iron will form the iron (III) ion)
2Fe + 3CuSO₄ → Fe₂(SO₄)₃ + 3Cu.
It is a redox reaction including replacing Cu with Fe and changing their oxidation states.
That Fe replaces Cu and resulting in ferric sulfate.
2. Combine lead (II) nitrate and potassium iodide solutions.
Pb(NO₃)₂+ 2Kl → PbI₂ + 2KNO₃.
It is a double replacement reaction that lead nitrate reacts with potassium iodide resulting in lead iodide and potassium nitrate.
3. Combine magnesium metal and hydrochloric acid solution.
Mg + 2HCl → MgCl₂ + H₂.
It is a dissolution reaction that HCl dissolve Mg and resulting in Magnesium chloride and hydrogen gas is evolved.
4. Electrolysis (splitting) of water.
H₂O → H₂ + 1/2O₂.
Water electrolysis resulting in splitting of water to produce hydrogen and water.
5. Burning magnesium.
2Mg + O₂ → 2MgO.
It is a combustion reaction that Mg is burned with oxygen to produce magnesium oxide.
Answer:
1. Fe₂(SO₄)₃ + 3Cu
2. PbI₂ + 2KNO₃
3. MgCl₂ + H₂
4. H₂ + 1/2O₂
5. 2MgO
Explanation:
what is the predictided change in the boiling point of water when 1.5 g of barium chloride (BaCl2) is dissolved in 1.5 Kg of water
Answers
Answer:
0.0074 °C.
Explanation:
Adding solute (BaCl₂) to water causes elevation of boiling water of water (collegative properties).We can predict the change in the boiling point (ΔTb) of water using the relation:ΔTb = i.Kb.m,
where, ΔTb is the elevation in boiling water.
i is van 't Hoff factor, The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.
i for BaCl₂ = 3/1 = 3.
Kb is the molal elevation constant of water (Kb = 0.512 °C/m).
m is the molality of the solution.
molality (m) is the no. of moles of solute dissolved in 1.0 kg of solvent.m = (no. of moles of BaCl₂)/(mass of water (kg)) = (mass/molar mass of BaCl₂)/(mass of water (kg)) = (1.5 g/208.23 g/mol)/(1.5 kg) = 0.0048 m.
∴ ΔTb = i.Kb.m = (3)(0.512 °C/m)(0.0048 m) = 0.0074 °C.
What is the empirical formula of a compound that is made of 3.80g of phosphorus and 0.371g of hydrogen?
Answers
You start by diving each quantity given by the atomic wight of each element:
Phosphorus (P) [tex]\frac{3.8}{31} =0.123[/tex]
Hydrogen (H) [tex]\frac{0.371}{1} =0.371[/tex]
Then you divide by the lowest number:
[tex]\frac{0.123}{0.123} = 1[/tex] for phosphorus
[tex]\frac{0.371}{0.123} = 3[/tex] for hydrogen
So the empirical formula will be:
[tex]PH_{3}[/tex]
how can liquids be seperated by density
A the liquids are absorbed onto a paper
B the liquids are turned into seperate vapors
C the liquids are collected as they evaporate
D the liquids are allowed to seperate into layers
Answers
Answer:
D the liquids are allowed to seperate into layers
D. The liquids are allowed to separate into layers.
Explanation:Density refers to the weight of the substance. The substance which is light in weight remains at the top of the substance which is heavy or with more density. This principle is used for separation of liquid based on their density.
In the process, the liquid sample composed of various liquids of varying density is poured in a separating funnel. The setup is left as it is without disturbance for considerable period of time. Based upon the weight of the liquid it forms a layer in which liquid with high density settles at the bottom, whereas liquid with less density remain at the top.
Which conclusion could be made from Ernest Rutherford’s gold foil experiment?
Atoms are made up of mostly empty space.
Atoms are mainly solid and block alpha particles.
The volume of the nucleus is large compared to the rest of the atom.
The mass of the nucleus is small compared to the rest of the atom.
Answers
Answer:
The correct option is :Atoms are made up of mostly empty space.
Explanation:
Ernest Rutherford’s gold foil experiment has following observation:
Most of the alpha particles had easily escaped through the atom which accounts for that atom is mostly empty space.Very less number of alpha particles were deflected from their path which indicated that positive charge is only concentrated in the center of the atom which termed as nucleus of an atom where positively charged i.e protons are located.Whole the mass of an atom is concentrated in the nucleus of the atom.The student repeated the experiment using a higher concentration of acid. The same volume of acid and the same mass of magnesium ribbon were used. What volume of hydrogen gas would have been produced after 60 seconds?
Answers
Answer:
53 cm³
Explanation:
When the student used dilute sulfuric acid, the reaction was complete after 60 s, because no more hydrogen was formed in the next 10 s.
The reaction would go faster if the student used a more concentrated acid, but 53 cm³ of hydrogen is the most that would form.
The blackbody curve for a star named beta is shown below. The most intense radiation for this star occurs in what spectral band?
Gamma rays
Ultraviolet
Visible
Infrared
Answers
Answer: Ultraviolet
Explanation:
The Electromagnetic spectrum involves gamma rays , X rays, ultra violet rays, visible rays, infrared rays, micro waves and radio waves which are arranged in order of increasing wavelength and decreasing frequency.
The wavelength range for gamma rays is less than 0.001 nm.
The wavelength range for ultraviolet rays is 1 nm to 400 nm.
The wavelength range for visible rays is 400 nm to 750 nm.
The wavelength range for infra red rays is 700 nm to 1000000 nm.
It can be seen from the graph that the most intense radiation for the star occurs near a wavelength of 200 nm , thus the most intense radiation occurs in ultraviolet band.
A stable atom that has a large nucleus most likely contains
1. more neutrons than protons.
2.more protons than neutrons.
3.equal numbers of protons and neutrons.
4.changing numbers of protons and neutrons.
Answers
Answer:
3.equal numbers of protons and neutrons.
Explanation:
A stable atom with a large nucleus would contain equal number of protons and neutrons. When the number of protons and neutrons in the nucleus are equal, an atom would attain stability.
Unstable atoms have either the number of protons or neutrons greater. In order for such atoms to attain stability, they give off the excess protons or neutrons. When atoms gives off excess protons or neutrons, they are said to be radioactive.
Answer:
More neutrons than protons
Explanation:
Which property does a metal with a large number of free-flowing electrons most likely have?
very hard
very brittle
poor conductivity
good conductivity
Answers
a metal with a large number of free-flowing electrons most likely have good conductivity
Answer: Option (d) is the correct answer.
Explanation:
Ability of an element or substance to conduct electricity is known as conductivity. Also, flow of electric current is the flow of free electrons.
It is known that metals contain more number of free electrons and they are good conductors of heat and electricity. Metals are hard substances.
Whereas non-metals are brittle and they are poor conductors of heat and electricity.
Thus, we can conclude that the property of a metal with a large number of free-flowing electrons most likely have good conductivity.
PLEASE HELP !!!!!!!!!
what is the solute and the solution for a solvent of 44.8g and percent of 4.8
Answers
Answer:
The solute is 2.26 g and the solution is 47.1 gExplanation:
1) Percent formula: % = (mass of solue / mass of solution)×100
mass of solute = xmass of solvent = 44.8 gmass of solution = mass of solute + mass of solvent = x + 44.8Substitue the values in the percent formula:
4.8 = 100 x / (x + 44.8 g) 0.048 = x / (x + 44.8)0.048 (x + 44.8) = xx - 0.048x = 2.15x = 2.15 / ( 1 - 0.048) x = 2.26Mass of solute = 2.26 g ← answer
2) Mass of solution = mass of solute + mass of solvent
Mass of solution = 2.26g + 44.8g = 47.1 g ← answerAnswer:
[tex]\boxed{\text{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]
Explanation:
[tex]\text{Mass percent} = \dfrac{\text{mass of solute }}{\text{mass of solute + mass of solvent}} \times 100 \, \%[/tex]
1. Calculate the mass of solute
Let x = mass of solute. Then
[tex]\begin{array}{rcl}4.8 & = & \dfrac{x}{x + 44.8} \times 100\\\\4.8(x + 44.8) & = & 100x\\4.8x + 215 & = & 100x\\215 & = & 95.2x\\\\x & = & \dfrac{215}{95.2}\\\\x & = & \textbf{2.26 g}\\\end{array}[/tex]
2. Calculate the mass of solution
Mass of solution = mass of solute + mass of solvent = (2.26 + 44.8) g
= 47.1 g
[tex]\boxed{\textbf{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]
In science class Richard learns that a substance has a boiling point of 230 Fahrenheit his teacher ask him to convert this temperature to degrees Celsius what is the boiling point of his substance in degrees Celsius
Answers
Answer:
110 celcius
Explanation:
(230- 32) · 5/9= 110
Answer:
Boiling point in degrees celsius = 356.4 (approximately 356 C)
Explanation:
Given:
Temperature = 230 Fahrenheit (F)
To determine:
The temperature in units of degrees celsius
Calculation:
Convert temperature from degrees celsius to degrees fahrenheit using the following formula:
[tex]C = (F-32)*1.8\\\\C = (230-32)*1.8 = 356.4[/tex]
Which of the following describes a situation where competition between producers exists
Answers
Answer:
C. two or more producers are trying to sell the same good or service to the same consumers.
Explanation:
APEX
According to Newton’s first law of morion when will an object at rest begin to move?
Answers
Hello There!
According to "Newton's First Law" an object at rest will begin to move when it is acted upon an unbalanced force.
Have A Great Day!
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A particle that the nucleus is an atom is called a(n)
Answers
Answer:
Eukaryotic cells
Explanation:
Prokaryotic cells do NOT have nuclei.
I hope this helps, and as always, I am joyous to assist anyone at any time.
an element has atomic number 10 and an atomic number mass of 20. How mamy neutrons are in the atom of this element?
Answers
Answer:
10
Explanation:
The atomic mass = 20
The atomic number = 10
The number of neutrons = mass - number = 20 - 10 = 10
This formula is always true. There are no exceptions.
What volume of a 0.0606 M solution of strontium bromide is needed to obtain 0.340 mol of the compound?
Question 42 options:
A)5.61 L
B) 3.4 L
C) 600 mL
D) 1 L
E) 178 mL
Answers
C=n/V
V=n/C=0.34/0.0606=5.61L