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Romashka-Z-Leto [24]
3 years ago
12

2. When paleontologists study fossils, which is true of the fossil record that they find?

Chemistry
2 answers:
juin [17]3 years ago
7 0

Answer:

Explanation:

d

solong [7]3 years ago
4 0

Answer:

The answer would be D the last one cause it shows how the animal has changed over time.

Explanation:

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SVETLANKA909090 [29]

D- Physical

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A physical property is anything that has characteristics associated with a change in it's chemical composition

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Consider the half reactions below for a chemical reaction.
ladessa [460]

Answer:

Option A:

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Explanation:

The half reactions given are:

Zn(s) → Zn^(2+)(aq) + 2e^(-)

Cu^(2+) (aq) + 2e^(-) → Cu(s)

From the given half reactions, we can see that in the first one, Zn undergoes oxidation to produce Zn^(2+).

While in the second half reaction, Cu^(2+) is reduced to Cu.

Thus, for the overall reaction, we will add both half reactions to get;

Zn(s) + Cu^(2+) (aq) + 2e^(-) → Cu(s) + Zn^(2+)(aq) + 2e^(-)

2e^(-) will cancel out to give us;

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

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Describe how oxidation and reduction involve electrons, change oxidation numbers, and combine in
Sholpan [36]

Answer:

Redox

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Reduction is gain of electrons

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