Chapter 2

Question 1

2-1

Answer 1

every sample of a given substance has identical intensive properties because every sample has the same composition

Question 2

2-1

Answer 2

three states of matter are solid liquid and gas

Question 3

2-1

Answer 3

physical changes to be classified as reversible or irreversible

Question 4

2-2

Answer 4

Mixtures can be classified as heterogeneous mixtures or as homogenous mixtures, based on the distribution of their components

Question 5

2-2

Answer 5

Differences in physical properties can be used to separate mixtures

Question 6

2-3

Answer 6

Compound can be broken down into simpler substances by chemical means, but elements cannot

Question 7

2-3

Answer 7

Chemists use chemical symbols to represent elements, and chemical formulas to represent compounds

Question 8

2-3

Answer 8

Compounds can be broken down into simpler substances by chemical means but elements cannot

Question 9

2-3

Answer 9

If the composition of a material is fixed, the material is a substance. If the composition may very, the material is a mixture

Question 10

2-4

Answer 10

During a chemical change, the composition of matter always changes

Question 11

2-4

Answer 11

Four possible clues to chemical change include a transfer of energy, a change in color, the production of a gas, or the formulation of a precipitate

Question 12

2-4

Answer 12

During any chemical reaction, the mass of the products is always equal to the mass of the reactants

Question 13

2-1

Answer 13

properties used to describe matter can be classified as extensive or intensive