Question

multiple choice write the letter of the correct answer in the space provided.
c 1. which property of matter is a measure of the gravitational force?
a. density
b. mass
c. volume
d. weight
a 2. in a graduated cylinder containing several liquid layers, the least dense liquid is found
a. floating at the top. \t\tc. in the lightest colored layer.
b. in the middle layer. \t\td. settled on the bottom.
____ 3. 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.
____ 4. melting crayons is an example of a
a. physical property.
b. physical change.
c. chemical property.
d. chemical change.
____ 5. which of the following units would be best for describing the volume of mercury (liquid) used in an experiment?
a. grams or kilograms \t\tc. liters or milliliters
b. meters or centimeters \t\td. newtons
____ 6. 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:

Question 1

To determine the property of matter that measures gravitational force, we analyze each option:

• Density ($

ho = \frac{m}{V}$) is mass per unit volume, not related to gravitational force.

• Mass is the amount of matter, independent of gravity.
• Volume is the space occupied, not related to gravity.
• Weight is the force due to gravity ($W = mg$), so it measures gravitational force.

In a graduated cylinder with liquid layers, density determines position. Less dense liquids float on more dense ones. So the least dense liquid is at the top. Color doesn't relate to density, and settling at the bottom or being in the middle would be for more dense liquids.

• Physical change: no new substance is formed, composition remains unchanged.
• Chemical change: new substance forms.
• Option a: Volumes don't "create" in physical change.
• Option b: New materials are in chemical change, not physical.
• Option d: Not all physical changes are reversible (e.g., breaking glass).
• Option c: Composition is unchanged in physical change, which is correct.

Answer:

d. weight

Question 2