Question

chapter test a
the properties of matter
multiple choice
write the letter of the correct answer in the space provided.

1. which property of matter is a measure of the gravitational force?

a. density
b. mass
c. volume
d. weight

1. in a graduated cylinder containing several liquid layers, the least dense liquid is found

a. floating at the top.
b. in the middle layer.
c. in the lightest colored layer.
d. settled on the bottom.

1. how does a physical change differ from a chemical change?

a. new volumes are created in a physical change.
b. new materials are produced in a physical change.
c. the composition is unchanged in a physical change.
d. the change is reversible in a physical change.

1. melting crayons is an example of a

a. physical property.
b. physical change.
c. chemical property.
d. chemical change.

1. which of the following units would be best for describing the volume of mercury (liquid) used in an experiment?

a. grams or kilograms
b. meters or centimeters
c. liters or milliliters
d. newtons

1. which of the following events is not a common sign that a chemical change has taken place?

a. change in color or odor
b. change in state
c. foaming or bubbling
d. production of heat or light

Explanation:

1. Weight is the measure of gravitational force acting on an object. Mass is the amount of matter, density is mass per unit volume, and volume is the amount of space occupied.
2. Less - dense liquids float on more - dense liquids in a graduated cylinder.
3. In a physical change, the composition of the substance remains the same, while in a chemical change, new substances are formed. Reversibility is also a key difference, but the main one is the composition aspect.
4. Melting is a physical change as it only changes the state of the crayons from solid to liquid without changing their chemical composition.
5. Volume of a liquid is measured in liters or milliliters. Grams and kilograms are for mass, meters and centimeters are for length, and newtons are for force.
6. A change in color or odor, foaming or bubbling, and production of heat or light are common signs of a chemical change. A change in state can be a physical change (like melting or freezing).

Answer:

1. d. weight
2. a. floating at the top
3. c. The composition is unchanged in a physical change.
4. b. physical change
5. c. liters or milliliters
6. b. change in state