Is Matter Around Us Pure

Question 1

What is matter?

Answer 1

Matter is anything that has mass and occupies space.

Question 2

True or False: All matter is pure.

Answer 2

False

Question 3

What is a pure substance?

Answer 3

A pure substance is a material that has a constant composition and consistent properties throughout.

Question 4

Fill in the blank: Elements and compounds are examples of ______ substances.

Answer 4

pure

Question 5

What is a mixture?

Answer 5

A mixture is a combination of two or more substances that are not chemically bonded.

Question 6

True or False: Mixtures can be separated by physical means.

Answer 6

True

Question 7

What is a homogeneous mixture?

Answer 7

A homogeneous mixture is a mixture that has a uniform composition throughout.

Question 8

What is a heterogeneous mixture?

Answer 8

A heterogeneous mixture is a mixture where the components can be seen and are not uniformly distributed.

Question 9

Give an example of a pure substance.

Answer 9

Water (H2O)

Question 10

Give an example of a heterogeneous mixture.

Answer 10

Salad

Question 11

Multiple Choice: Which of the following is a characteristic of a pure substance? A) Variable composition B) Fixed composition C) Contains mixtures

Answer 11

B) Fixed composition

Question 12

What process can be used to separate a mixture of sand and salt?

Answer 12

Dissolving the salt in water and filtering the sand.

Question 13

True or False: Air is a pure substance.

Answer 13

False

Question 14

What distinguishes a compound from a mixture?

Answer 14

A compound is made of two or more elements chemically bonded together, while a mixture is a physical combination of substances.

Question 15

Fill in the blank: The ______ of a substance can help determine if it is pure or a mixture.

Answer 15

properties

Question 16

What is the difference between a solution and a suspension?

Answer 16

A solution is a homogeneous mixture where the solute is dissolved, while a suspension is a heterogeneous mixture where particles are suspended but not dissolved.

Question 17

Multiple Choice: Which of the following is NOT a method of separating mixtures? A) Filtration B) Distillation C) Synthesis

Answer 17

C) Synthesis

Question 18

True or False: The composition of a homogeneous mixture can vary.

Answer 18

True

Question 19

What is distillation used for?

Answer 19

Distillation is used to separate mixtures based on differences in boiling points.

Question 20

Name one physical property that can indicate purity.

Answer 20

Melting point

Question 21

What is the main characteristic of a colloid?

Answer 21

A colloid is a mixture where tiny particles are dispersed throughout but not settled.

Question 22

Fill in the blank: Pure substances have _____ boiling and melting points.

Answer 22

specific

Question 23

What is the term for a substance made of only one type of atom?

Answer 23

Element

Question 24

True or False: All elements are pure substances.

Answer 24

True

Question 25

What is an alloy?

Answer 25

An alloy is a mixture of two or more metals.

Question 26

What is the significance of the law of definite proportions?

Answer 26

It states that a chemical compound contains the same proportion of elements by mass, regardless of the amount of the compound.