Question 1

Which of the following best defines 'matter' according to the provided notes?

Accepted Answer

Anything that has mass and occupies space

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 3

Which statement correctly distinguishes between an element and a compound?

Accepted Answer

An element is made of only one type of atom, while a compound is made of two or more elements chemically bonded together.

Question 4

Which of the following is an example of a diatomic element?

Accepted Answer

$$\mathrm{O}_2$$

Question 5

A sample contains only molecules of $$\mathrm{H}_2\mathrm{O}. $$How would this sample be classified?

Accepted Answer

Compound

Question 6

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that looks the same throughout

Question 7

Which of the following is a heterogeneous mixture?

Accepted Answer

A salad with lettuce, tomatoes, and cucumbers

Question 8

Which of the following statements about pure substances is correct?

Accepted Answer

Pure substances are composed of only one type of element or compound.

Question 9

A container holds both $$\mathrm{O}_2$$ molecules and $$\mathrm{N}_2$$ molecules. How should this sample be classified?

Accepted Answer

Mixture

Question 10

Which of the following is a correct example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 11

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically bonded together

Question 12

Which of the following is NOT a property of a mixture?

Accepted Answer

The components are chemically bonded together

Question 13

A student shakes up a bottle of salad dressing and observes that it looks uniform throughout. After a few minutes, layers form. How should the salad dressing be classified before and after shaking?

Accepted Answer

Homogeneous mixture when shaken, heterogeneous mixture after settling

Question 14

Which of the following is a correct statement about the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed ratio of elements, while a mixture does not.

Question 15

Which of the following best describes the composition of air?

Accepted Answer

A homogeneous mixture of gases

Question 16

A sample contains both $$\mathrm{NaCl}$$ crystals and $$\mathrm{H}_2\mathrm{O}$$ molecules. Which classification is most accurate?

Accepted Answer

Mixture

Question 17

Which of the following is a real-world example of a heterogeneous mixture?

Accepted Answer

Granite rock

Question 18

Which of the following is a pure substance?

Accepted Answer

$$\mathrm{O}_2$$ gas

Question 19

Which of the following best explains why compounds are considered pure substances?

Accepted Answer

They are composed of only one type of molecule with a fixed composition.

Question 20

A chemist combines iron filings and sulfur powder. The mixture is stirred and looks the same throughout. Which classification is most accurate for the mixture before any reaction occurs?

Accepted Answer

Homogeneous mixture

Elements, Compounds, and Mixtures: Classification of Matter

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