Chemistry Review 2.2—2.3 Name ____________________________________ Hr______

Section 2.2

1. How might one separate a mixture of water and salt?

2. What is a homogeneous mixture?

3. Which of the following mixtures are homogeneous? Which is heterogeneous?

a. Gasoline b. Chunky peanut butter

c. Oil and vinegar salad dressing d. Orange soda

4. Which of he following are pure substances? Which are mixtures?

a. Ethanol b. Vinegar c. Motor oil d. Helium

____________ _______________ _______________ ____________

5. Classify each of the following as physical or chemical separations:

a. Air Oxygen + Nitrogen ____________________________

b. Water Hydrogen + Water ____________________________

c. Salt Water Water + Sodium Chloride ____________________________

Section 2.3

1. What elements make up chloroform, chemical formula CHCl3 ?

2. Name the elements represented by the following chemical symbols

a. Pb b. K c. Au d. Fe

____________ _______________ _______________ ____________

3. Write the chemical symbol for each of the following elements

a. chlorine b. sodium c. silver d. carbon

____________ _______________ _______________ ____________

4. Classify the following as Element, compound, or Mixture

a. salt b. water c. iron d. sterling silver

____________ _______________ _______________ ____________

5. A liquid is allowed to evaporate and leaves no residue. Can you determine whether it was an element, a

compound, or a mixture?

6. Which of the following is not an element?

a. copper b. sulfur c. ammonia d. helium

2.2

1. A physical combination of two or more substances is a _______________________

2. A mixture has a variable composition and may be identified as _________________________or

____________________________

3. Homogeneous mixtures are known as __________________________and have uniform properties

4. Any part of a system with uniform composition and properties is called a ___________________ (oil in

salad dressing)

5. Many mixtures can be separated into their __c_______________________by physical methods

6. _____________________is a method of separation involving boiling and re-condensation of a liquid.

2.3

1. Define the following Terms:

a. Elements:

b. Compounds:

c. Mixture

d. Chemical Symbol:

2. Classify each substance as an element or a compound:a. Water b. Oxygen c. Table salt d. Alcohol e. Mercury____________ _______________ _______________ ____________ _____________

Draw a picture of a distillation of Grape juice:

Draw a picture of how you would get coffee grounds out of the

coffee.

Draw a picture of the instrument used to get iron metal shavings out of sand