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3 years ago

9.

Chemistry

1 answer:

siniylev [52]3 years ago

3 0

Answer:

C. the boiling point of water

Explanation:

B is correct because boiling point only usually differs among the same substance when pressure changes. So say you take one solution onto a mountain top and another at sea level, the boiling point will not be the same, but here we assume they are in the same place so it won't.

A cannot be because the containers are all different shapes (and we aren't talking about like molecular shape of water from what I assume, we mean macroscopically, so that can't be).

B cannot be because we have 4 different temperatures.

D cannot be because we have 4 different temperatures, and therefore different amounts of steam will be released per minute as not all the waters have reached boiling.

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A change involving whole atoms is called _____.

givi [52]

Answer is: chemical.

If the arrangement of particles is changed, that is chemical change or chemical reaction (new substance is formed).

In physical change, the bonds between oxygen and hydrogen can not be separated.

For example, balanced chemical reaction: 2Mg(s) + O₂(g) → 2MgO(s).

Chemical changes (chemical synthesis) is when a substance combines with another (in this example magnesium and oxygen) to form a new substance.

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3 years ago

For the reaction CO(g) + 3 H2(g) ⇌ H2O(g) + CH4(g) , Kc = 190 at 1000 K. If a vessel is filled with these gases such that the in

zheka24 [161]

Answer:

<u>the reaction will shift to the left </u>and produce more reactants

Explanation:

Step 1: data given

Kc = 190

Temperature = 1000 K

[CO] = 0.025 M

[H2] = 0.045 M

[H2O] = 0.025 M

[CH4] = 0.046 M

When Q=Kc, the system is at equilibrium and there is no shift to either the left or the right.

When Q<Kc, there are more reactants than products. As a result, some of the reactants will become products, causing the reaction to shift to the right.

When Q>Kc, there are more products than reactants. To decrease the amount of products, the reaction will shift to the left and produce more reactants

Step 2: The balanced equation

CO(g) + 3 H2(g) ⇌ H2O(g) + CH4(g)

Step 3: calculate Q

Q = [H2O][CH4] / [CO][H2]³

Q = (0.025*0.046) / (0.025*0.045³)

Q = 504.8

Q > Kc

This means there are more products than reactants. To decrease the amount of products, <u>the reaction will shift to the left </u>and produce more reactants

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3 years ago

Chemistry 1 Question

nika2105 [10]

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Explanation:

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4 years ago

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yaroslaw [1]

The partial pressure of oxygen, P(O₂) is 198.83 mmHg.