Unit 3 Review

What happens when you add energy to a liquid? (SC.8.P.11.1)

• Freezing

• Chemical change

• Physical change

• Evaporation

1. What is true of all physical changes? (SC.8.P.11.1)

• A new substance is formed.

• A substance is altered in size, shape or form.

• Something has to break.

• Something has to be folded.

1. When the process of melting happens, what is happening with the molecules and the phase change? (SC.8.P.11.1)

• The molecules are speeding up turning a solid into a liquid.

• The molecules are slowing down turning a solid into a liquid

• The molecules are speeding up turning a liquid into a solid.

• The molecules are slowing down turning a liquid into a solid.

1. When the process of condensation happens, what is happening with the molecules and the phase change? (SC.8.P.11.1)

• The molecules are speeding up turning a liquid into a gas.

• The molecules are slowing down turning a liquid into a gas.

• The molecules are speeding up turning a gas into a liquid.

• The molecules are slowing down turning a gas into a liquid.

1. What happens when you add energy to a liquid? (SC.7.P.11.1)

• Melting and it will turn into a

  solid.

• Freezing and it will turn into a

  solid

• Evaporation and it will turn into a

  gas.

• Condensation and it will turn into a

  gas.

1. What does the Law of Conservation of Mass state? (SC.8.P.9.1)

• The amount of mass is changed in every experiment.

• The amount of mass is increased in every experiment.

• The amount of mass is decreased in every experiment.

• The amount of mass stays the same in every experiment.

1. Brandon dissolved 10 grams of salt in 100 mL of water to form salt water. He then boiled the solution and the water boiled away. How much salt would be left in the beaker? (SC.8.P.9.1)

• 1 gram

• 10 grams

• 90 grams

• 110 grams

In fall, dead leaves fall off trees. Every day, animals eliminate waste. All animals eventually die. As a result, what happens to the mass of the Earth? (SC.8.P.9.1)

• The mass of the Earth steadily decreases.

• The mass of the Earth steadily increases.

• The mass of the Earth stays about the same.

• The Earth does not have a mass because it is too big.

What happens to the mass of a whole piece of paper when cut into pieces and placed in a pile? (SC.8.P.9.1)

• The mass of the whole piece of paper will be less than the mass of the pile of paper.

• The mass of the whole piece of paper and pile of paper will be the same.

• The mass of the whole piece of paper will be more than the mass of the pile of paper.

• The whole piece of paper doesn’t have a mass because it is too light.

On a sunny day, Elena is cutting branches from a tree in her yard. At midday, she takes a break, leaving a pile of branches and leaves on the ground. When she returns and gathers the branches, she notices the leaves are wilted and crisp. Which of the following correctly describes what happened to the leaves?

• The trees had not received water for a long time before being cut.

• The warm temperature caused moisture to evaporate from the leaves.

• The nutrients cannot reach the leaves if the tree’s branches are not upright.

• The leaves had been covered in frost the week before, but had not wilted until now.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1