Physical Science Review

8.PS.1.01 Which of the following best describes a mixture?

• a material that is made up of many molecules

• a substance that can be changed into another substance

• a material that contains two or more different substances

• a substance that has been broken down into its smallest parts

8.PS.1.01 Methane and propane are two compounds that are composed only of carbon and hydrogen atoms. The table below shows some of the properties of these two compounds. Which of the following conclusions is best supported by the information in the table?

• When two elements combine, the mass of each element changes.

• When two compounds are mixed, the state of matter of the mixture changes.

• Two elements can combine to produce different substances with different properties.

• Two compounds can be mixed together to produce different materials with different properties.

Tags

NGSS.MS-PS1-1

8.PS.1.02 Which of the following provides the best evidence that a chemical change is taking place?

• A liquid forms as a solid object melts.

• A flame burns on the surface of a solid.

• Steam rises from the surface of a liquid.

• A metal object becomes shorter when it is cooled.

Tags

NGSS.MS-PS1-2

What is the smallest unit of matter?

• atom
• element
• molecule
• compound

Tags

NGSS.MS-PS1-5

Identify this particle of matter.

• element

• atom

• compound

• Mixture

Tags

NGSS.MS-PS1-1

Describe this sample

• Pure compound
• Mixture of elements
• Mixture of compounds
• Mixture of elements and compounds

Tags

NGSS.MS-PS1-1

On the periodic table we can find hydrogen and oxygen. They chemically combine to form water. Which of the following describes water?

• Atom

• Element

• Compound

• Mixture

Tags

NGSS.MS-PS1-1

A molecule of limestone, CaCO₃, has how many total atoms?

• 3

• 5

• 6

• 12

Tags

NGSS.MS-PS1-1

The air in this room is an example of

• an element

• a compound

• a mixture

• a solvent

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

• a change of color
• a change of state
• a temperature decrease
• a temperature increase

Tags

NGSS.MS-PS1-4