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].
Deuterium is an isotope of hydrogen. The nucleus of a deuterium atom consists of one proton and one neutron. When two deuterium nuclei fuse, helium-3 is formed, and a neutron is emitted. Give the equation that illustrates this process?
Answer:
[tex]^2_1H+^2_1H->^3_2He+^1_0n[/tex]Explanation:
Remember that the atomic number of an element is the number of protons and the mass number is the number of protons plus neutrons.
1) Deuterium representation:
Hydrogen: ⇒ HOne proton: ⇒ [tex]_1H[/tex]One neutron: ⇒ add 1 to the mass number = 1 + 1 = 2 ⇒ [tex]^2_1H[/tex]2) Helium-3 representation:
He atom with 1 neutron: ⇒ mass number = 2 + 1 ⇒ [tex]^3_He[/tex]3) Neutron representation
Atomic number 0 and mass number 1: ⇒ [tex]^1_0n[/tex]4) Nuclear equation:
[tex]^2_1H+^2_1H->^3_2He+^1_0n[/tex] ← answerAnswer:
the answer is D. on edg 2020
Explanation:
An acidified solution was electrolyzed using copper electrodes. A constant current of 1.18 A caused the anode to lose 0.584 g after 1.52 ✕ 103 s. (a) What is the gas produced at the cathode and what is its volume at STP? name of gas volume of gas WebAssign will check your answer for the correct number of significant figures. L (b) Given that the charge of an electron is 1.6022 ✕ 10−19 C, calculate Avogadro's number. Assume that copper is oxidized to Cu2+ ions.
Answer:
[tex]\boxed{\text{(a) 209 mL; (b) } 6.09 \times 10^{23}}[/tex]
Explanation:
(a) Gas produced at cathode.
(i). Identity
The only species known to be present are Cu, H⁺, and H₂O.
Only the H⁺ and H₂O can be reduced.
The corresponding reduction half reactions are:
(1) 2H₂O + 2e⁻ ⇌ H₂ + 2OH⁻; E° = -0.8277 V
(2) 2H⁺ +2e⁻ ⇌ H₂; E° = 0.0000 V
Two important points to remember when using a table of standard reduction potentials:
The higher up a species is on the right-hand side, the more readily it will lose electrons (be oxidized). The lower down a species is on the left-hand side, the more readily it will accept electrons (be reduced}.H⁺ is below H₂O, so H⁺ is reduced to H₂.
The cathode reaction is 2H⁺ +2e⁻ ⇌ H₂, and the gas produced at the cathode is hydrogen.
(ii) Volume
a. Anode reaction
The only species that can be oxidized are Cu and H₂O.
The corresponding half reactions are:
(3) Cu²⁺ + 2e⁻ ⇌ Cu; E° = 0.3419 V
(4) O₂ + 4H⁺ + 4e⁻ ⇌ 2H₂O E° = 1.229 V
Cu is above H₂O, so Cu is more easily oxidized.
The anode reaction is Cu ⇌ Cu²⁺ + 2e⁻.
b. Overall reaction:
Cu ⇌ Cu²⁺ + 2e⁻
2H⁺ +2e⁻ ⇌ H₂
Cu + 2H⁺ ⇌ Cu²⁺ + H₂
c. Moles of Cu lost
[tex]n_{\text{Cu}} = \text{0.584 g } \times \dfrac{\text{1 mol}}{\text{63.55 g}} = 9.190 \times 10^{-3}\text{ mol Cu}[/tex]
d. Moles of H₂ formed
[tex]n_{\text{H}_{2}}} = 9.190 \times 10^{-3}\text{ mol Cu} \times \dfrac{\text{1 mol H}_{2}}{\text{1 mol Cu}} =9.190 \times 10^{-3}\text{ mol H}_{2}[/tex]
e. Volume of H₂ formed
Volume of 1 mol at STP (0 °C and 1 bar) = 22.71 mL
[tex]V = 9.190 \times 10^{-3}\text{ mol}\times \dfrac{\text{22.71 L}}{\text{1 mol}} = \text{0.209 L} = \boxed{\textbf{209 mL}}[/tex]
(b) Avogadro's number
(i) Moles of electrons transferred
[tex]\text{Moles of electrons} = 9.190 \times 10^{-3}\text{ mol Cu}\times \dfrac{\text{2 mol electrons}}{\text{1 mol Cu}}\\\\\\= \text{0.018 38 mol electrons}[/tex]
(ii) Number of coulombs
Q = It
Q = \text{1.18 C/s} \times 1.52 \times 10^{3} \text{ s} = 1794 C
(iii). Number of electrons
[tex]n = \text{ 1794 C} \times \dfrac{\text{1 electron}}{1.6022 \times 10^{-19} \text{ C}} = 1.119 \times 10^{22} \text{ electrons}[/tex]
(iv) Avogadro's number
[tex]N_{\text{A}} = \dfrac{1.119 \times 10^{22} \text{ electrons}}{\text{0.018 38 mol}} = \boxed{6.09 \times 10^{23} \textbf{ electrons/mol}}[/tex]
Interpolate: Use the equation to determine what the student enrollment in 2003 likely was.
students
Answer:
1244 students
Explanation:
That would be y = 82*3 + 998
= 1244.
Answer:
The expected student enrollment in 2003 is 1244.
Explanation:
The given diagram it is clear that the graph represents the relationship x and y, where x is number of years since 2000 and y is number of student enrollment.
From the given figure it is clear that the equation of best fit line is
[tex]y=82x+998[/tex] .... (1)
We need to find the expected student enrollment in 2003.
Year 2003 is 3 years since 2000.
Substitute x=3 in equation (1) to find the expected student enrollment in 2003.
[tex]y=82(3)+998[/tex]
[tex]y=246+998[/tex]
[tex]y=1244[/tex]
Therefore the expected student enrollment in 2003 is 1244.
Match the following.
1. hybrid BB
2. dominant "pure breed" 3:1
3. recessive alleles Bb
4. phenotype ratio bb
Answer:
hybrid BB
Dominant Bb
recessive alleles bb
phenotype ratio 3:1
Answer:
hybrid BB
dominant Bb
recessive alleles bb
phenotype ratio 3:1
Explanation:
because phenotype ratio is a type of ratio so it match with the ratio. that's what l think
Given that Kw for water is 2.4× 10–14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.
Answer:
pH = 6.81.
Explanation:
The ionization of water is given by the equation :H₂O(l) ⇄ H⁺(aq) + OH⁻(aq),
The equilibrium constant (Kw) expression is:
Kw = [H⁺][OH⁻] = 2.4 x 10⁻¹⁴.
in pure water and neutral aqueous solution, [H⁺] = [OH⁻]
So, Kw = [H⁺]²
∴ 2.4 x 10⁻¹⁴ = [H⁺]²
∴ [H⁺] = 1.55 x 10⁻⁷ M.
∵ pH = - log [H⁺]
pH = - log (1.55 x 10⁻⁷) = 6.81.
The stability of an isotope is based on its
Answer:
It is believed that the stability of an isotope is based on the ratio of neutrons to protons.
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When you perform this reaction, what substances could remain at the end of the reaction? Check all that apply.
excess reactant aqueous copper chloride
excess reactant aluminum
oxygen
product solid copper
carbon dioxide
product aqueous aluminum chloride
water
Answer:
a.) excess reactant aqueous copper chloride.
b.) excess reactant aluminum.
d.) product solid copper.
f.) product aqueous aluminum chloride.
g.) water.
Explanation:
just did the lab, here's the answers :)
Excess reactant aluminum, oxygen, product solid copper, product aqueous aluminum chloride, water could remain at the end of the reaction.
Explanation:
When performing the reaction between aluminum and copper chloride, there are several substances that could remain at the end of the reaction:
Excess reactant aluminum: If aluminum is present in excess, then it would remain at the end of the reaction.
Oxygen: If oxygen is introduced into the reaction, it could remain as a result of incomplete combustion.
Product solid copper: Copper is formed as a product of the reaction between aluminum and copper chloride.
Product aqueous aluminum chloride: Aluminum chloride is also formed as a product of the reaction.
Water: Water can also be present as a product depending on the conditions of the reaction.
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The balanced equation given below means: CH4 + 2 O2 → CO2 + 2H2O The balanced equation given below means: CH4 + 2 O2 → CO2 + 2H2O One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. One gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water. One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water. One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water, one gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water and one molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water and one molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
Answer:
See below.
Explanation:
CH4 + 2 O2 → CO2 + 2H2O
One molecule of methane reacts with 2 molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
It is also true if we replace the word molecule by mole.
Answer : The correct option is,
One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water.
Explanation :
The given balanced chemical reaction is,
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
The given chemical reaction is a balanced reaction.
By the stoichiometry we can say that,
One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
or,
One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water.
Calculate the molarity of 48.0 mL of 6.00 M H2SO4 diluted to 0.250 L .
Answer:
1.152 M.
Explanation:
It is known that the no. of millimoles of a substance before dilution is equal to the no. of millimoles after dilution.∴ (MV) before dilution = (MV) after dilution
before dilution: M = 6.0 M, V = 48.0 mL.
after dilution: M = ??? M, V = 0.25 L = 250.0 mL.
∴ M after dilution = (MV) before dilution/(V) after dilution = (6.0 M)(48.0 mL)/(250.0 mL) = 1.152 M.
To calculate the molarity of the diluted solution, use the formula M1V1 = M2V2 and plug in the values to find the final molarity.
Explanation:To calculate the molarity of the diluted solution, we can use the formula:
M1V1 = M2V2
Where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Plugging in the values:
(6.00 M)(48.0 mL) = (M2)(0.250 L)
and solving for M2, we find:
M2 = (6.00 M)(48.0 mL) / (0.250 L) = 1152 M
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Why is the melting of ice not a chemical change?
Answer:
Chemical change is basiclly chemical reaction that creates new substances, sometimes can be hard to observed. The melting of the ice only involves in changing the form of the matter, from solid to liquid form, it doesn't transform the substance which is water into another substance. Therefore, the melting of ice is not a chemical change, but rather a physical one.
Answer:
A new substance is not formed
Explanation:
Its still water just not physically
When salt is dissolved in water, what happens to the water
Answer:
When salt is dissolved in water, many physical properties change, among them the so called colligative properties:
The vapor pressure of water decreases,The boiling point increases,The freezing point decreases, andOsmotic pressure appears.Explanation:
Colligative properties are the physical properties of the solvents whose change is determined by the number of particles (moles or ions) of the solute added.
The colligative properties are: vapor pressure, boiling point, freezing point, and osmotic pressure.
Vapor pressure:
The vapor pressure is the pressure exerted by the vapor of a lquid over its surface, in a closed vessel.
The vapor pressure increases when a solute is added, because the presence of the solute causes less solvent molecules to be near the surface ready to escape to the vapor phase, which means that the vapor pressure is lower.
Boiling point:
The boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. Since we have seen that the vapor pressure of water decreases when a solute occupies part of the surface, now more temperature will be required for the water molecules reach the atmospheric pressure. So, the boiling point increases when salt is dissolved in water.
Freezing point:
The freezing point is the temperarute at which the vapor pressure of the liquid and the solid are equal. Since, the vapor pressure of water with salt is lower than that of the pure water, the vapor pressure of the liquid and solid with salt will be equal at a lower temperature. Hence, the freezing point is lower (decreases).
Osmotic pressure:
Osmotic pressure is the additional pressure that must be exerted over a solution to make that the vapor pressure of the solvent in the solution equals the vapor pressure of the pure solvent. This additional pressure is proportional to the concentration of the solute: the higher the salt concentration the higher the osmotic pressure.
What is the total reduction potential of a cell in which lithium (li) is reduced and mercury (hg) is oxidized?
Answer: The total reduction potential of the cell is -3.89 V.
Explanation:
We are given:
Reduction of lithium follows the reaction:[tex]Li^++e^-\rightarrow Li[/tex]
The standard reduction potential for this is -3.04 V
Oxidation of mercury follows the reaction:[tex]Hg\rightarrow Hg^{2+}+2e^-[/tex]
The standard reduction potential for this is -0.85 V
The cell formed by these half reactions is: [tex]Hg/Hg^{2+}||Li^+/Li[/tex]
The cell potential, [tex]E^o_{cell}=E^o_{oxidation}+E^o_{reduction}[/tex]
[tex]E^o_{cell}=[-0.85+(-3.04)]=-3.89V[/tex]
Hence, the total reduction potential of the cell is -3.89 V.
What is the difference between the energy of spring A, stretched 0.6 meters, and spring B, stretched 0.3 meters, if they have the same spring constant? A. Spring A has more potential energy than spring B. B. Spring A has less potential energy than spring B. C. Springs A and B have the same potential energy. D. Springs A and B have the same kinetic energy.
Your answer would be A, Spring A has more potential energy.
Potential energy is exactly what it sounds like - energy that has the potential to exist due to stressors, but doesn't yet. In this case, the spring is ready to jump back into its original position however it can't because of it still being stretched, therefore this tension is what creates potential energy.
When you measure potential energy, the one with greater of it is the one where it has more stress being placed on it. In this case, spring A is being stretched furthest so it has the most potential energy.
Hope this helped!
Answer:
a
Explanation:
Pastoral farming is best described as _______. a. a method of raising livestock and moving herds b. an African method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming Please select the best answer from the choices provided A B C D
Answer:
Pastoral farming is best described as a method of raising livestock and moving herds. (a.)
What are the two largest greenhouse gases
Carbon dioxide and M
ethane
PLEASE HELP WILL GIVE BRAINLYIST TO FIRST PERSON
Which would have a lower pH, a 0.1 M solution of a strong base or a weak base? Why?
Which would have a higher pH, a 0.1 M solution of a strong acid, or a weak acid? Why?
Answer:
1) Weak base.
2) Weak acid.
Explanation:
1) Which would have a lower pH, a 0.1 M solution of a strong base or a weak base? Why?
For bases:Solution with lower pH means that the solution has a lower basic character.
While solution with higher pH means that the solution has a higher basic character.
When we have a 0.1 M solution of a strong base or a weak base, the weak base will have a lower pH because it is not completely dissociated to produce OH⁻ ions.
While, strong base dissociates completely to produce OH⁻ ions, so it will has higher basic character and thus has a higher pH value.
So, weak base will have the lower pH value.
2) Which would have a higher pH, a 0.1 M solution of a strong acid, or a weak acid? Why?
For Acids:
Solution with lower pH means that the solution has a higher acidic character.
While solution with higher pH means that the solution has a lower acidic character.
When we have a 0.1 M solution of a strong acid or a weak acid, the weak acid will have a higher pH because it is not completely dissociated to produce H⁺ ions, so it has a lower acidic character.
While, strong acid dissociates completely to produce H⁺ ions, so it will has higher acidic character and thus has a lower pH value.
So, weak acid will have the higher pH value.
Use the measurements in the table to determine which unidentified metal has the highest density.
Metal Volume Mass
A 10.5 cm3 122 g
B 14.2 cm3 132 g
C 16.1 cm3 115 g
D 12.7 cm3 126 g
Answer:
Metal A has the highest density.
Explanation:
Density is defined as mass present in unit volume of the substance.
[tex]Density=\frac{Mass}{Volume}[/tex]
Density of metal A
Mass of metal = 122 g
Volume of metal = [tex]10.5 cm^3[/tex]
[tex]D=\frac{122 g}{10.5 cm^3}=11.61 g/cm^3[/tex]
Density of metal B
Mass of metal = 132 g
Volume of metal = [tex]14.2 cm^3[/tex]
[tex]D=\frac{132 g}{14.2 cm^3}=9.29 g/cm^3[/tex]
Density of metal C
Mass of metal = 115 g
Volume of metal = [tex]16.1 cm^3[/tex]
[tex]D=\frac{115 g}{16.1 cm^3}=7.14 g/cm^3[/tex]
Density of metal D
Mass of metal = 126 g
Volume of metal = [tex]12.7 cm^3[/tex]
[tex]D=\frac{126 g}{12.7 cm^3}=9.92 g/cm^3[/tex]
Metal A has the highest density.
How does water vapor get into the atmosphere?
Answer:
through the water cycle
Explanation:
Diversification is most effective when security returns are _________.
Answer:
negatively correlated
is HNO3 (aq) an acid or a base?
Answer:
HNO3 (aq) is an acid
Explanation:
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How many valence electrons are in atom of radon?
Answer: 8
Explanation: Radon has 8 valence electrons. Radon is considered stable with a complete octet of electrons, filling the s and p orbitals.
Chromium(III) oxide reacts with hydrogen sulphide gas to form chromium(III) sulphide and water. How many grams of hydrogen sulphide are required to produce 324.8 g of chromium(III) sulphide?
Answer:
165.726 g.
Explanation:
For the balanced equation:Cr₂O₃ + 3H₂S → Cr₂S₃ + 3H₂O,
It is clear that 1 mol of Cr₂O₃ and 3 mol of H₂S to produce 1 mol of Cr₂S₃ and 3 mol of H₂O.
Firstly, we need to calculate the no. of moles of 324.8 g of chromium(III) sulphide:no. of moles of Cr₂S₃ = mass/molar mass = (324.8 g)/(200.19 g/mol) = 1.62 mol.
Now, we can find the "no. of grams" of H₂S are needed:
Using cross multiplication:
3 mol of H₂S produces → 1 mol of Cr₂S₃, from stichiometry.
??? mol of H₂S produces → 1.62 mol of Cr₂S₃.
∴ The no. of moles of H₂S are needed = (3 mol)(1.62 mol)/(1 mol) = 4.86 mol.
∴ The "no. of grams" of H₂S are needed = (no. of moles of H₂S)(molar mass of H₂S) = (4.86 mol)(34.1 g/mol) = 165.726 g.
What caused the different pH values for the test solutions? Each solution has a different concentration of ions. hydroxide or hydrogen?
Answer: The correct answer is hydrogen.
Explanation:
pH is defined as the negative logarithm of hydrogen or hydronium ion concentration that are present in a solution.
The equation representing pH of the solution follows:
[tex]pH=-\log[H^+][/tex]
pH range of the solution varies from 0 to 14.
If the pH of the solution is from 0 to 6.9, the solution is said to be acidic.
If the pH of the solution is from 7.1 to 14, the solution is said to be basic.
If the pH of the solution is 7, the solution is said to be neutral.
Thus, different concentration of hydrogen ions will give us different values of pH.
Hence, the correct answer is hydrogen.
The different pH values for the test solutions result from the distinct concentrations of hydrogen (H+) or hydroxide (OH-) ions present in each solution. Acidic solutions have more H+ ions and a lower pH, while alkaline solutions have more OH- ions and a higher pH.
Explanation:The different pH values for the test solutions are caused by the varying concentrations of their hydrogen ions (H+) or hydroxide ions (OH-). The pH value is essentially a measure of the hydrogen ion concentration in the solution. Acidic solutions have a higher concentration of H+ ions and therefore a lower pH value (below 7), while basic or alkaline solutions have a higher concentration of hydroxide ions, resulting in pH values above 7. For instance, if one solution has more hydroxide ions than another, it will have a higher pH value, indicating it is more basic.
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When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____.
A) hydrolyzed
B) oxidized
C) reduced
D) an oxidizing agent
Answer:
B) oxidized
Explanation:
When glucose loses a hydrogen atom, it is losing 1 proton and 1 electron. This loss of an electron means it is oxidized.
The glucose molecule becomes oxidized when it loses a hydrogen atom in an oxidation-reduction reaction. This reflects the loss of electrons, which is characteristic of oxidation, while gaining electrons, or hydrogen atoms, indicates reduction.(Option b)
Explanation:When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes oxidized. This loss of hydrogen represents the molecule giving up electrons, which characterizes the process of oxidation. Conversely, when a molecule gains hydrogen atoms, it is said to be reduced.
In the context of glucose metabolism, an oxidizing agent would be a molecule like NAD+ or FAD, which accepts the electrons that are lost when glucose is oxidized. Hence, the carbohydrate is oxidized, liberating energy that the body can use.
Remember that in the process of cellular respiration, glucose is oxidized into carbon dioxide (CO2), and the oxygen is reduced while forming water (H2O). Glucose losing hydrogens means it is becoming oxidized, and the gaining of hydrogen by oxygen to form water indicates that oxygen is being reduced.
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three diagnostic characteristics of an acid are:
three diagnostic characteristics of a base are:
Answer:
Explanation:
An acid:
According to Arrhenius Theory, is a substance that interacts with water to produce excess hydrogen ion in an aqeous solution. The Bronsted -Lowry Theory defines an acid as a proton donor. The Lewis Theory states that an acid is an electron pair acceptor.A base:
Arrhenius defined a base as a substance which interacts with water to yield excess hydroxide ions in an aqeous solution. Bronsted-Lowry defined a base as a proton acceptor. The Lewis Theory described a base as an electron pair donor.Acids and bases have unique diagnostic characteristics that can be used to identify them. Acids taste sour, turn blue litmus paper red, and react with metals to produce hydrogen gas. Bases taste bitter, turn red litmus paper blue, and feel slippery.
Explanation:Three diagnostic characteristics of an acid:
An acid tastes sour.An acid turns blue litmus paper red.An acid reacts with metals to produce hydrogen gas.Three diagnostic characteristics of a base:
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A mixture of iron and sulfur can be separated by
distillation, magnetic attraction, filtration
An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons
Answer: Electrons and protons
An atom of lithium-7 has an equal number of electrons and protons. Therefore, the correct option is option 2.
What is lithium?Lithium is a chemical substance with the atomic number three as well as the symbol Li. The material is a delicate alkali metal in white-silver. Under normal conditions, it is both the lowest population metal and the least populated inorganic element. Because lithium is an extremely reactive as well as flammable alkali metal, it must be stored in a vacuum.
When cut, it has a glossy luster, but wet air quickly corrodes it, turning it into an olive drab silvery gray, eventually merely a black patina. Only compounds, particularly pegmatitic minerals, which has also historically been the primary source of lithium, may exist naturally. An atom of lithium-7 has an equal number of electrons and protons.
Therefore, the correct option is option 2.
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• 1 mol of beryllium • 1 mol of salt • 1 mol of water • 1 mol of hydrogen Which statement is true about these substances?
Answer:
they all contain the same number of molecules at constant temperature and pressure
Answer:
Option D is correct! - They have different masses.
Explanation:
The pictured compound has which of the following bonds?
Answer: There are C - C bonds and C - H bonds.
trust me! I took a test with this question and got 100! :)
The pictured compound has C - C bonds and C - H bonds.
What is a Bond?
This is defined as an attraction between atoms, ions or molecules which results in the formation of chemical compounds.
The compound is an alkane as the formula is C₄H₁₀(butane) which has only C - C bonds and C - H bonds single bonds thereby making option C the most appropriate choice.
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Which of the following is an incorrect pairing?
a. CH2::CHCH2CH2CH2CH2CH2CH3, alkene
b. CH3OCH3, amine
c. CH3CH2OH, alcohol
d. (CH3)2CO, ketone
Answer:
b. CH3OCH3, amine.
Explanation:
It is not an amine It is ethyl ether.
The option that is incorrect pairing is b. CH3OCH3, amine.
What are aminesCH3OCH3 represents the chemical formula for dimethyl ether, which is a type of ether. Ethers are organic compounds characterized by an oxygen atom linking two alkyl or aryl groups. They are not classified as amines.
Amines, on the other hand, are a different class of organic compounds that contain a nitrogen atom bonded to carbon atoms. They are typically named with the suffix "-amine" and can be primary, secondary, or tertiary depending on the number of alkyl or aryl groups bonded to the nitrogen atom.
Therefore, the pairing of CH3OCH3 with amine is incorrect, as CH3OCH3 is an ether, not an amine.
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