Question

question 10
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is a penny an element, a heterogeneous mixture, a compound, or a homogeneous mixture?
select one:
a. element.
b. heterogeneous mixture.
c. compound.
d. homogeneous mixture.

question 11
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is copper (ii) chloride an element, a heterogeneous mixture, a compound, or a homogeneous mixture?
select one:
a. element.
b. heterogeneous mixture.
c. compound.
d. homogeneous mixture.

question 12
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is water an element, a heterogeneous mixture, a compound, or a homogeneous mixture?
select one:
a. element.
b. heterogeneous mixture.
c. compound.
d. homogeneous mixture.

Explanation:

• For Question 10: A modern penny is mostly zinc with a copper coating, and the composition is not uniformly distributed at the visible level, making it a heterogeneous mixture.
• For Question 11: Copper (II) chloride ($\text{CuCl}_2$) is made of two different elements (copper and chlorine) chemically bonded in a fixed ratio, so it is a compound.
• For Question 12: Water ($\text{H}_2\text{O}$) consists of hydrogen and oxygen atoms chemically combined in a fixed proportion, so it is a compound.

Answer:

Question 10: b. Heterogeneous mixture.
Question 11: c. Compound.
Question 12: c. Compound.