Chapter 2 Key Concepts

Question 0

Explain why all samples of a given substance have the same intensive properties

Answer 0

Because every sample has the same composition

Question 1

Name two categories used to classify properties of matter

Answer 1

Extensive or intensive

Question 2

Name three states of matter

Answer 2

Solid, liquid, and gas

Also plasma

Question 3

Describe the two categories used to classify physical changes

Answer 3

Reversible or irreversible

Question 4

How are mixtures classified?

Answer 4

Based on the distribution of their components, mixtures can be classified as heterogeneous mixtures or a homogeneous mixtures

Question 5

What type of properties can be used to separate mixtures?

Answer 5

Differences in physical properties

Question 6

How is a compound different from an element?

Answer 6

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

Question 7

How can you distinguish a substance from a mixture?

Answer 7

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

Question 8

What are chemical symbols and chemical formulas used for?

Answer 8

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

Question 9

How does a chemical change affect the composition of matter?

Answer 9

During a chemical change, the composition of matter always changes

Question 10

Name four possible clues that a chemical change has taken place

Answer 10

A transfer of energy, a change in color, the production of a gas, or the formation of a precipitate

Question 11

In a chemical reaction, how does the mass of the reactants compare to the mass of the products?

Answer 11

They always equal each other