P.1.3

Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water. Which statement BEST describes the changes that occur when burning coal and boiling water?

• Burning coal and boiling water are both physical changes.

• Burning coal and boiling water are both chemical changes.

• Burning coal is a chemical change, and boiling water is a physical change.

• Burning coal is a physical change, and boiling water is a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

A student uses universal indicator pH paper and gets the following results. The substance that was tested is:

• an acid

• a base

• neutral

• a pure substance

Tags

NGSS.MS-PS1-2

How does a catalyst work in a reaction?

• By lowering the activation energy of the reaction

• by becoming a part of the chemical reaction

• by giving the reaction more energy

• by decreasing the number of collisions between particles

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

• Nickel

• air

• peanuts

• blood

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 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

NGSS.MS-PS1-5

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