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netineya [11]
4 years ago
12

Water contrasts on freezing ?

Chemistry
1 answer:
Airida [17]4 years ago
8 0

No. When water first begins to cool down, it contracts. However, as it gets colder and eventually freezes, it begins to expand.

You can test this by freezing water in a water bottle: when you take it out of the freezer, the cap might have popped off or cracks may have formed in the sides of the bottle.

Answer: Water expands when frozen, not contracts.

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3 years ago
At 82K, a gas has a volume of 4.60L. What would be the volume of the gas at 70K?
Oliga [24]

Answer:

V₂ = 4.0L

Explanation:

Decreasing temperature => Decreasing Volume (Charles Law)

For a given volume, use a temperature ratio that will give a smaller volume.

Volume at lower temp = 4.6L(70K/82K) = 4.0L ... Using (82K/70K) would give a larger volume => contrary to temperature effects on gas volumes when pressure and mass are kept constant.

Pressure effects on Gas Volumes:

Note: The same idea is applied to pressure effects on gas volumes also except that changes in pressure affect gas volumes indirectly. That is, an increase in pressure => decrease in volume, or a decrease in pressure => increase in volume. Boyles Law => V ∝ 1/P.

Given a gas volume of 4.60L at 760mmHg, what is volume at 848mmHg?

Increasing pressure => Decreases Volume (Boyles Law)

For the given volume use a pressure ratio that will give a smaller volume.

Volume at higher pressure = 4.6L(760mm/848mm) =4.1L. Using (848mm/760mm) would give a larger volume => contrary to pressure effects on gas volume when temperature and mass of gas are kept constant.

4 0
3 years ago
We looked at the acrylonitrile molecule, c3h3n, in the previous exercise. Which of the following statements about the molecule i
tiny-mole [99]

The true statemments that reflect the nature of the compound are statements (i) and (ii).

<h3>What is acrylonitrile?</h3>

The molecule acrylonitrile has thre carbon and hydrogen atoms and one nitrogen atom. The  c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Also, there are two unhybridized p orbitals on the N atom.

Hence; among  the options, the true statemments that reflect the nature of the compound are statements (i) and (ii).

Learn more about acrylonitrile: brainly.com/question/13731887

5 0
2 years ago
Which of the following is a positively charged subatomic particle?
miss Akunina [59]
It’s a proton. “proton: Positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element.”
7 0
3 years ago
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