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4 years ago

2. How does a particles energy change as it changes state?

1 answer:

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When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.
In chemistry, a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties. To avoid confusion, a pure substance is often referred to as a "chemical substance."

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Select all that apply. The rate law for the reaction 2NO(g) + CU(g) rightarrow 2NOCl(g) is given by R = k[NO][Cl2] If the follow

Daniel [21]

Answer:

a. 2nd order reaction.

b. The first step is the slow step.

Explanation:

r = k[NO][Cl₂]

a. The reaction is first-order in [NO] and first-order in [Cl₂], so it is second-order overall.

b. The first step is the slow step, because it predicts the correct rate law.

c. is wrong. Doubling [NO] would double the rate, because the reaction is first-order in [NO].

d. is wrong. Cutting [Cl₂] in half would halve the rate, because the reaction is first-order in [Cl₂].

e. is wrong. The molecularity is two, because two particles are colliding.

f. is wrong. Both steps are bimolecular.

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4 years ago

Magnesium has 12 protons. What charge do you expect it to have when it ionizes? Why?

olya-2409 [2.1K]

<u>Answer:</u> This element has +2 charge on it.

<u>Explanation:</u>

An ion is formed when an atom looses or gains electrons.

When an atom looses electrons, it leads to the formation of positive ion known as cation.
When an atom gains electrons, it leads to the formation of negative ion known as anion.

Magnesium is the 12th element of the periodic table having electronic configuration of $1s^22s^22p^63s^2$

This element will loose 2 electrons to attain stable electronic configuration and leads to the formation of a cation having formula $Mg^{2+}$

Hence, this element has +2 charge on it.

7 0

3 years ago

What method would you use to separate sand from gasoline?

WARRIOR [948]

Answer:

Filtration (The process of separating liquids and solids)

Explanation:

Filtration works best when the solute isn't dissolved in the solvent. Basically like how you can filter dirt or sand from water. The opposite of this would be if water and sugar where mixed together you cannot unmix this duo with filtration but with the example given you can use the process of filtration to rid the gasoline of sand.

8 0

3 years ago

A scientist studied a population of gorillas in central Africa for one year. During this time, four gorillas were born and one o

Nat2105 [25]

Answer: zero and had no net change

Explanation:

5 0

4 years ago

Read 2 more answers

LAB SUMMARY: Answer the following two questions in complete sentences. You may re-watch the lab video clips as needed. What evid

Karolina [17]

The change in color from silver to gold is a chemical change.

<h3>What is a a chemical change?</h3>

A chemical change is one in which a new substance is formed. In this case, we can see from the video that zinc was added along with the sodium hydroxide solution and heated

Thus we know that a chemical change would cause an alteration in how the substance looks as a result of the alterations in the arrangement of atoms in the system. This rearrangement of atoms is what causes the chemical change to occur.

The color of the coin changed from silver to gold when the coin was placed on the hotplate. This could be regarded as a chemical change because an alloy was formed in the process.

Learn more about chemical change:brainly.com/question/28317769

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8 0

2 years ago