Sci 8 CBM 7 Review

Select the answer from the menu. Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more _______.

• molecules

• elements

• gases

• solids

• elements

The table shows the density of water at different temperatures. Which statement is correct regarding the relationship between the temperature and the density of water?

• The density of water is independent of the temperature.

• The density of water decreases with a decrease in temperature.

• The density of water decreases with an increase in temperature.

• The density of water first increases and then decreases with an increase in temperature.

What happens to a wooden log when it is burned?

• It is completely destroyed.

• It is completely changed into heat energy.

• It changes into other types of matter and energy.

• It physically changes into the gaseous phase.

A student pushes on an object with a force of 6 newtons and the object does not move, so the object exerts on the student's hands a force equal to:

• 6 newtons

• 0 newtons

• 12 newtons

• 3 newtons

What is the speed of the bus relative to the van? mph

• 25 mph

• 50 mph

• 30 mph

• 85 mph

How does a gasoline-powered car accelerate?

• Energy from the engine increases the thermal energy of the car.

• Energy from the engine increases the kinetic energy of the car.

• Energy from the engine increases the potential energy of the car.

• Energy from the engine increases the electrical energy of the car.

The volume of a sound depends on the amplitude of the sound waves. The lower the amplitude of a sound wave, the quieter the sound. Which of the following sound waves illustrates the quietest sound?

• A

• B

• C

• D

How is the information from the audio wave stored after it is processed by the analog-to-digital converter?

• It is stored as images because it was converted to mathematical equations.

• It is stored as a series of ones and zeros because it was converted to binary data.

• It is stored as a table of ones and twos because it was converted to a radio wave.

• It is stored as graphs because it was converted to base ten data.

Based on the table, choose the two planets with day lengths that are most similar to each other.

• A. Mercury

• B. Venus

• C. Mars

• D. Earth

• E. Neptune

Storms transport water in the form of rain. The energy that starts this process comes from

• the ocean

• the Sun
• clouds

• Earth