Question 1

Which of the following is NOT considered matter according to the definition provided in the notes?

Accepted Answer

Light

Question 2

Which statement best describes a compound?

Accepted Answer

A substance made of two or more elements chemically bonded together

Question 3

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

Accepted Answer

A glass of salt water after stirring

Question 4

A sample contains only oxygen molecules ($$O_2). $$How would you classify this sample?

Accepted Answer

Element

Question 5

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with visibly different parts or layers

Question 6

Which of the following is a pure substance?

Accepted Answer

Salt ($$NaCl)$$

Question 7

A container holds both $$H_2O$$ molecules and $$O_2$$ molecules. How would you classify the contents?

Accepted Answer

Mixture

Question 8

Which of the following statements is TRUE about mixtures?

Accepted Answer

Mixtures can be separated by physical means

Question 9

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

Accepted Answer

Oxygen ($$O_2)$$

Question 10

A student mixes sand and iron filings together. What type of mixture is formed?

Accepted Answer

Heterogeneous mixture

Question 11

Which of the following best explains why salt water is considered a homogeneous mixture?

Accepted Answer

It looks the same throughout after the salt is dissolved

Question 12

Which of the following is NOT a characteristic of a compound?

Accepted Answer

Can be separated by physical means

Question 13

A mixture of oil and water is left to sit. After some time, the oil forms a layer on top of the water. What type of mixture is this?

Accepted Answer

Heterogeneous mixture

Question 14

Which of the following is the best definition of matter?

Accepted Answer

Anything that has mass and occupies space

Question 15

Which of the following is a mixture?

Accepted Answer

Air

Question 16

Which of the following can be classified as a pure substance?

Accepted Answer

Oxygen gas ($$O_2)$$

Question 17

A student observes a sample that looks the same throughout and is made of two different types of molecules not chemically bonded. What type of matter is this?

Accepted Answer

Homogeneous mixture

Question 18

Which of the following is true about elements?

Accepted Answer

Elements can be made of molecules

Question 19

Which of the following is an example of a compound?

Accepted Answer

Table sugar ($$C_{12}H$$_{22}$$O_{11}$)

Question 20

A mixture is shaken and appears uniform throughout. Which type of mixture is this most likely to be?

Accepted Answer

Homogeneous mixture

Elements, Compounds, and Mixtures: Classification of Matter

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