8th Grade GMAS Quick Check - Structures & Properties of Matter

S8P1b.

Reggie puts a beaker of ice and water on a hot plate, and the ice slowly begins to melt as shown in diagram below. After a few minutes, only liquid water is in the beaker. Eventually, the water becomes hot and boils. The liquid water changes to water vapor, which is a gas. How is the ice different from the water vapor that forms after the water begins to boil?

• The ice has a lower boiling point.

• The ice particles move faster.

• The ice has a higher temperature.

• The ice particles have less energy.

S8P1b.

A scientist observed a sample of an unknown material. His observations are shown?

In which physical state is the scientist's sample?

• liquid

• gas

• solid

• plasma

S8P1b.

The diagram shows a substance in various states of matter. Which figure from the diagram shows the substance as a solid?

• Figure 1

• Figure 2

• Figure 3

• Figure 4

S8P1e.

The diagram below shows the block for cobalt (Co) as seen on the periodic table. What is the atomic number of cobalt?

• 27

• 28

• 58.933

• 31.933

S8P1.e

Darnell draws a picture of a nitrogen atom. He draws a small circle to represent the nucleus and draws dots around the circle to represent the electrons. How many dots does he draw?

• 5 dots

• 7 dots

• 14 dots

• 16 dots

S8P1.a

Which diagram shows the particles of a homogeneous mixture?

• 
• 
• 
•