Which of the following is an example of a pure substance?

• Nickel

• air

• peanuts

• blood

Tags

NGSS.MS-PS1-4

Sea water is an example of ______.

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

A _________ is made of two or more substances that are together in the same place but their atoms are NOT chemically bonded.

• compound

• mixture

• substance

• filtration

In a ______ mixture, each substance can be easily distinguished.

• heterogeneous

• homogeneous

• element

• pure substance

Which of the following is an example of a PURE SUBSTANCE?

• A only

• A and B

• C and D

• A, B and C

Tags

NGSS.MS-PS1-1

Which of the following examples can be identified as a physical property?

• magnetism

• oxidation (rust)

• flammability

• pH

Which is an example of a chemical reaction?

• Water evaporates into air

• Vinegar added to baking soda forms a gas

• Sugar dissolves in water

• Corn kernels are crushed to form flour

Tags

NGSS.MS-PS1-2

As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?

• using heat to burn a log in a fireplace

• using light to produce sugar in plants

• a cake that was baked from many ingredients

• a bottle that was broken into many small pieces

When frozen carbon dioxide is heated, it changes directly into a gas. Which statement BEST indicates that a physical change has taken place?

• Heat caused an increase in gas production.

• Heat caused a new substance to form.

• Heat caused a decrease in energy.

• Heat caused a change in state.

Tags

NGSS.MS-PS1-4

When iron combines with oxygen in a moist environment, rust forms because of a

• chemical reaction

• physical reaction

• homogenous mixture

• heterogenous mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5