Physical and Chemical Changes

What tool to help me separate a mixture of sand and iron fillings?

• Use a funnel made of filter paper

• Pour the sand and iron fillings in a pot of boiling water

• Use a magnet

• Use a sieve

Tanner holds an ice cube in his hand. The ice changes its shape, his hands are getting wet, and the ice cube is getting smaller. He says this is a physical change. Which argument supports his claim?

• The ice cube is melting since his hands are warmer than the ice. Heat is being added to the ice, which causes the particles to move faster.

• The ice cube is melting since the state is changing from a liquid to a solid. Heat is being added to the ice, which causes the particles to move slower.

• The ice cube is freezing since his hands are much warmer than the ice. Heat is being removed from the ice, which causes the particles to move slower.

• The ice cube is melting in his hand since the state is changing from a solid to a liquid. Heat is being removed from the ice, which causes the particles to move faster.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which experiment shows a chemical change?

• When you mix salt and water, the salt dissolves.

• When you mix vinegar and baking soda, it bubbles to show gas being emitted.

• When you mix water and blue food coloring, the water turns blue.

• When you mix salt, baking soda, and blue food coloring, it is hard to separate.

Tags

NGSS.MS-PS1-2

Three students plan and carry out an experiment to show a chemical change. Which student created a chemical change?

• Marvin mixes yeast and hydrogen peroxide. Bubbles form and a gas is creted.

• Jordan mixes salt and water, and the salt dissolves in the water.

• Leah mixes water and yellow food coloring. The water turns yellow.

• None of them.

Tags

NGSS.MS-PS1-2

How could you separate a mixture of cereal and milk?

• Use evaporation to boil the milk.

• It cannot be separated.

• Use a magnet.

• Use a filter and funnel.

Katriel mixes 2 substances and notices there are bubbles and the temperature stays the same, so it is a chemical change.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Nick combines two substances and notices the liquid changes color and the temperature changes over time, so it is a chemical change.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Landon mixes salt with a clear liquid. The salt dissolves and the temperature does not change, so this is a chemical change.

• True

• False

Tags

NGSS.MS-PS1-2

Jorgia mixes vinegar with a white powder and gas collects in a balloon. The temperature also drops. This is a chemical change.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

Why are making pancakes or chocolate chip cookies a chemical change?

• The batter changes its physical properties.

• Baking the batter turns it golden brown and an odor (smell) is produced.

• The butter emits a gas.

• When the ingredients are combined, you cannot separate it.

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2