Explain what happens to a fixed sample of gas when its temperature changes.
Answers
n=const.
R=const.
V~T, it means If temperature increase than volume of gas increase.
if temperature decrease than volume of gas decrease.
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sand
oxygen
gold
carbon dioxide
helium
carbon
rust
seawater
1. Name the two metals
2.Name a gas that is not an element
3.Name a mixture
4.Name a non metallic element that is a solid .
Answers
Answer:
1. gold and rust
2. carbon dioxide
3. sea water
4. carbon
Answer:
1. Gold and Iron
2. Helium
3. Seawater
4.Rust
Explanation:
Answers
Kb = KaKb
1.00 x 10^-14 = 7.2 x 10^-4(x)
x = 1.39 x 10^-11
We now need to calculate the [OH¯] using the Kb expression:
1.39 x 10^-11 = x^2 / (0.30 - x)
The denominator can be neglected. Thus, x is 3.73 x 10^-6.
pOH = -log 3.73 x 10^-6 = 5.43
pH = 14-5.43 = 8.57
Answer:
pH=8.32
Explanation:
The relevant equilibrium for this problem is
F⁻ + H₂O ↔ HF + OH⁻
With a constant Kb of
Kb=
Kb=
To calculate the value of Kb we use the formula Kw=Ka*Kb, where Kw is the ionization constant of water, 1 * 10⁻¹⁴.
1 * 10⁻¹⁴ = 7.2*10⁻⁴ * Kb
Kb = 1.4 * 10⁻¹¹
So now we have
1.4 * 10⁻¹¹=
We make the assumption that x<<<0.30 M, so we can rewrite the equation of Kb as:
1.4 * 10⁻¹¹=
So [OH⁻]=2.05*10⁻⁶
- pOH=5.68
- pH = 14 - pOH
- pH=8.32
Answers
Answer:
Explanation:
a) this is for the gases with lowest molecular mass meaning they are light and so move faster and so mix faster
b) The gas taking least time will be Cl2 as it is the heaviest gas and so moves the slowest
c) Same its Cl2 and same reason
d) This will be lighter than oxygen but heavier than nitrogen
(2) C2H5OH and CH4
(3) KOH and H2SO4
(4) KOH and CH4
Answers
Final answer:
An electrolyte is a substance that conducts electricity when dissolved in water because it dissociates into ions. Out of the given compounds, H2SO4 and KOH are electrolytes because they fully ionize in solution, while C2H5OH and CH4 are not.
Explanation:
An electrolyte is a substance that, when dissolved in water, enables the solution to conduct electricity. It does so because the compound breaks apart into ions, which can carry a charge. To find out which compounds are electrolytes, we look at whether or not they dissociate into ions in solution.
Out of the options given:
- C2H5OH (ethanol) and H2SO4 (sulfuric acid) - here, H2SO4 is a strong electrolyte because it completely ionizes in water. C2H5OH, on the other hand, is not an electrolyte as it does not dissociate into ions.
- C2H5OH (ethanol) and CH4 (methane) - neither of these is an electrolyte as they do not dissociate into ions.
- KOH (potassium hydroxide) and H2SO4 (sulfuric acid) - both are strong electrolytes, which means they fully dissociate into ions in an aqueous solution.
- KOH (potassium hydroxide) and CH4 (methane) - in this case, KOH is a strong electrolyte while CH4 is not because it does not dissociate into ions in water.
Learn more about Electrolytes here:
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Answers
Acetone is a vapor, since it is normally a liquid at room temperature, which is the definition of a vapor.
Answers
Answer:
The Big Bang Theory is the dominant cosmological theory about the early development of the universe. Cosmologists use the term "Big Bang" to refer to the idea that the universe was originally very hot and dense at some finite time in the past. Since then it has cooled by expansion to the current diluted state and continues to expand today. The theory is supported by more complete and precise explanations from available scientific evidence and observation. According to the best measurements available in 2010, the initial conditions occurred approximately 13.3 or 13.9 billion years ago.
In general, three empirical evidences that support the cosmological theory of the Big Bang are considered. These are: the expansion of the universe that is expressed in Hubble's law and that can be seen in the redshift of galaxies, the detailed measurements of the cosmic microwave background, and the abundance of light elements. In addition, the correlation function of the large-scale structure of the universe fits with the Big Bang theory.