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3 years ago

Read the following, and answer the questions below. Remember to read the question carefully.

Chemistry

1 answer:

andreev551 [17]3 years ago

8 0

<h3>Question #1:</h3>

False.

Melting is a type of chemical change.

<h3>Question #2:</h3>

True.

If the substance's atoms change in any way, it is a chemical change.

<h3>Question #3:</h3>

True.

If a substance is broken or torn, it's still the same substance. (Take tearing paper, for example)

<h3>Question #4:</h3>

False.

Take boiling water for example, when you boil water, it is still water, right?

<h3>Question #5:</h3>

False.

<em><u>Every</u></em> chemical or physical change in matter includes change in energy. <u><em>Not most.</em></u>

<h3>Question #6</h3>

True.

Hydrogen peroxide (H2O2), has turned into water (H2O) and oxygen (O). The substance has change chemically, therefore it is an chemical change.

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I hoped this helps! If you have any questions, feel free to ask! ^^

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2 years ago

(a) Given that Ka for acetic acid is 1.8 X 10^-5 and that for hypochlorous acid is 3.0 X 10^-8, which is the stronger acid? (b)

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Answer:

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ClO⁻ is stronger conjugate base than OAc⁻

Kb(OAc⁻) = 5.5 x 10⁻¹⁰

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Explanation:

Assume 0.10M HOAc => H⁺ + OAc⁻ with Ka = 1.8 x 10⁻⁵

=> [H⁺] = √Ka·[Acid] =√(1.8 x 10⁻⁵)(0.10) M = 1.3 x 10⁻³M H⁺

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HOAc delivers more H⁺ than HClO and is more acidic.

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