Classy Chemistry

Sam wanted to know what happens when different substances are combined. He chose five different substances and made observations about each (Table 1).

Sam then performed four investigations combining different substances in a cup without a lid and recorded the results of each investigation (Table 2).

Sam categorized the changes he saw in the table below (Use the image).

Which Investigations did Sam categorize correctly?

• Investigations 1 and 2

• Investigations 1, 2, and 4

• Investigations 1, 3, and 4

• Investigations 3 and 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sam made the claim that a new substance was formed in Investigation 1. Select all of the evidence Sam could use to support this claim.

• Bubbles form

• Temperature decreases

• Solid dissolves in liquid

• Liquid remains clear

• There is a change in weight when the cup had no lid

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sam noticed that in Investigation 4, the weight changed. What would be an explanation for the change in

weight?

• The decrease in temperature caused the weight to decrease.

• The powder that was added to the liquid disappeared.

• The bubbles that formed were a gas that left the cup.

• The cup tipped over and the mixture spilled out.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In Investigation 2, Sam used 12 grams of Substance D. The cup weighed 8 grams. What was the weight

of Substance A?

• 112 grams

• 120 grams

• 124 grams

• 144 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sam decided to complete an additional experiment. He combined 120 grams of Substance A with 15

grams of Substance E in a cup that weighs 8 grams. Substance E sank to the bottom of the liquid when

they were combined. How much did the mixture weigh?

• 113 grams

• 127 grams

• 135 grams

• 143 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Katherine places a wooden cutting board over the top of a pot of boiling water. After several minutes,

she places her hand on top of the board. She observes that the wooden cutting board is cool.

Based on Katherine’s observation, which of the following are appropriate applications of using wood?

Select all that apply.

• Using it to make pots and pans.

• Making handles for utensils like ladles and pans.

• Making oven mittens to keep hands from burning.

• Using it as a door for a house.

Tags

NGSS.MS-PS3-3

Sophia is baking a cake. She prepares the batter by adding 500 g of flour, 200 g of butter, and 300 g of

sugar in a bowl. What is the weight of the batter in the bowl?

• 500 g

• 700 g

• 800 g

• 1,000 g

Xavier added 20 g of baking soda to a plastic bag containing 20 mL of vinegar and immediately closed

the bag. He observed the vinegar and baking soda reacted to release a gas, which caused the bag to

expand.

What happened to the total weight of the substances in the sealed bag after the reaction?

• The total weight stayed the same.

• The total weight decreased.

• The total weight increased.

• The bag absorbed some of the weight.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Yawa is conducting an investigation with a balloon. She blows up the balloon and ties it. She measures the balloon and then places it into the freezer. After 15 minutes, she removes the balloon from the freezer, makes observations and measures the balloon. Next, she places the

balloon outside in the sun. After 15 minutes she observes and measures the balloon again. The table below shows her observations and measurements.

What is Yawa most likely testing in her investigation?

• How fast a balloon changes in a freezer.

• How the amount of air in a balloon affects its size.

• How heat affects the air particles in a balloon.

• How air disappears when heat is changed.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Yawa wants to better understand why the balloon changes size based on temperature changes, so she researches the topic.

Yawa’s research supports what she sees in her experiment. Complete the table with the correct information for each box.

Instructions: Draw a line that connects the example to either "When heated" or "When cooled".

Tags

NGSS.MS-PS1-4