Chemical Physical Changes Minor

Henry is looking into how heat changes different things. He does four tests to see if a chemical change happens. The table shows what he did and saw. Which thing shows Henry that a chemical change happened?

• The piece of paper because a new substance is formed

• The pot of water because the material disappears

• The tin strip because it has a change in temperature

Tags

NGSS.MS-PS1-2

Mason mixed two liquids together in a science experiment. What kind of change happened in this experiment?

• It was a chemical change because the color changed when the liquids were mixed.

• It was a physical change because the color changed when the liquids were mixed.

• It was a chemical change because the temperature stayed the same when the liquids were mixed.

Tags

NGSS.MS-PS1-2

Alex observes how a snow pile changes over time. Alex notes the time and outdoor temperature. The data is shown. Which statement is BEST supported by the data?

• Solid water turns into liquid water if it gets enough heat.

• Liquid water freezes into solid water if it gets cold enough.

• Snow will always melt when the temperature goes above freezing.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Lee has a beaker of salty water and his teacher wants him to take out the salt from it.

What can Lee do to get the salt out?

• He should heat the mixture until it boils. The heat will cause a change that separates the salt from the water.

• He should add more salt until it soaks up all the water. This would leave only the salt behind.

• He should pour the mixture through a sieve. The sieve will separate the salt from the water.

Tags

NGSS.MS-PS1-4

Hannah was observing how water changes at different temperatures during her science experiment.

Which of these reasons based on Hannah's findings BEST explains how water changes as it gets hotter?

• The tiny bits that make up water multiply, making more water and changing its state.

• The tiny bits that make up water start moving faster, changing the state of the water and its shape as they move.

• The tiny bits that make up water slow down or stop, turning the solid into a liquid.

Tags

NGSS.MS-PS1-4

Arjun mixed vinegar with baking soda and wrote down what they saw.

Which statement BEST explains why Arjun thought a chemical change happened?

• 
  When they mixed them, there was no smell. The lack of smell showed a chemical change happened.

• When they mixed them, no heat was given off. This means it wasn't a physical change, so it must have been a chemical change.

• When they mixed them, bubbles formed, showing a gas was made. This means a chemical change happened.

Tags

NGSS.MS-PS1-2

Leo's mom got orange juice with bits in it, but Leo doesn't like the bits. Before he drinks it, Leo uses a strainer to take out the bits. The picture shows how Leo took out the bits from the juice.

What is the best way to say what Leo did?

• Leo made two new things, which is a physical change.

• 
  Leo split a mixture, which is a chemical change.

• Leo split a mixture, which is a physical change.

Charlotte conducted four different experiments as shown.

In which experiment did Charlotte observe a chemical change?

• Experiment 1 because the state of matter changed.

• Experiment 2 because a new material was made.

• Experiment 3 because the heat level changed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Aiden is heating a pot of water on a stove.

If the water keeps heating, what will probably happen?

• Some of the water will turn into a liquid.

• Some of the water will freeze, and some will turn into steam.

• All the water will turn into steam, and there will be no liquid left.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Alex is helping his mom make salsa. His mom chops tomatoes, a spicy pepper, and an onion. Alex mixes everything, adds some hot sauce, and stirs it up. The picture shows the salsa they made.

What did Alex and his mom create?

• They made a mixture, which is a chemical change.

• They made a mixture, which is a physical change.

• They made a new substance, which is a physical change.