Chemical and Physical Changes

In which situation is a chemical reaction not taking place?

• salt dissolving in water

• rusting of an old car in a junk yard

• burning gasoline in a car

• digestion of food in your body

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A fifth grade student mixed 2 mL of vinegar with 1 g of baking soda in a glass beaker for a science experiment. The student observed her mixture 2 days later and noticed all the liquid was gone, and a thin layer of salt had formed in the bottom of the beaker.

Which statement best explains the reaction that occurred between the baking soda and vinegar to produce the salt?

• The baking soda absorbed the vinegar and changed to salt.

• The vinegar evaporated, and the baking soda changed to salt when it dried.

• The vinegar and baking soda chemically combined to create a type of salt.

• The baking soda absorbed the liquid from the vinegar, leaving salt in the beaker.

Tags

NGSS.MS-PS1-2

A student mixes two clear liquids and finds that they turn blue when combined. What type of change did the student observe?

• change in color

• change in shape

• change in size

• change in texture

Tags

NGSS.MS-PS1-2

Anna takes some apples and makes the changes as described in the list.

1. Cuts and apple into four pieces

2. peels apple

3.cooks an apple in the oven

4. slices and apple and tops it with cool whip

Which process(es) will lead to a chemical change only?

• 1 only

• 3 only

• 2 and 4

• 1 and 2

Tags

NGSS.MS-PS1-2

Which pair of substances when mixed together form a new substance that has different properties than the original substances?

• salt + water

• sugar + water

• vinegar + baking soda

• food coloring + milk

Tags

NGSS.MS-PS1-2

In which activity does the substance change to a new substance?

• boiling of milk

• freezing of water

• milk turning sour

• adding sugar to water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student makes a list of changes observed.

1. water freezing

2. milk curdling

3. iron rusting

4. butter melting

Which choice correctly classifies the changes observed?

• physical change 1 and 2

  chemical change 3 and 4

• physical change 1 and 4

  chemical change 2 and 3

• physical change 1 and 3

  chemical change 2 and 4

• physical change 3 and 4

  chemical change 1 and 2

Tags

NGSS.MS-PS1-2

Jesse lost his favorite ball. He described it as white and bumpy. What two physical properties did Jesse use in this part of his description?

• size and volume

• shape and texture

• mass and size

• color and texture

Tags

NGSS.5-PS1-3

Which is a way that a piece of paper can go through a chemical change?

• fold the paper in half
• soak the paper in water
• burn the paper with fire
• cut the paper with scissors

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a way that a piece of paper can go through a chemical change?

• fold the paper in half
• soak the paper in water
• burn the paper with fire
• cut the paper with scissors

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4