Chemical and Physical Changes

Four students are mixing Substance A with Substance B in four separate and sealed containers. Each student is using different amounts of Substances A and B to begin the reaction. During the reaction, Substance A completely reacts with Substance B to produce Substance C and Substance D. The data is summarized in the table.

Which container will have the greatest mass at the end of the reaction?

• container 1

• container 2

• container 3

• container 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Regina 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 mass of the batter in the bowl?

• 500 g

• 700 g

• 800 g

• 1,000 g

A student selects three identical containers and adds different amounts of yeast, sugar, and water into each container, as shown in the table. The containers are then sealed. Carbon dioxide is formed inside each container due to the reaction. What is the relationship among the masses of the containers after the reaction?

• mass of Container A = mass of Container B = mass of Container C

• mass of Container A < mass of Container B < mass of Container C

• mass of Container B > mass of Container A > mass of Container C

• mass of Container B < mass of Container A < mass of Container C

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student mixes 40 grams of substance A with 20 grams of substance B in a bowl that weighs 100 grams. When the two substances mix, a gas causes bubbles to form and pop. The student measures the weight of the substances and the bowl after 15 minutes. Which statement correctly identifies and explains the weight of the substances and the bowl after 15 minutes?

• 157 grams; the two substances are mixed in a closed system, which causes weight loss.

• 157 grams; the bowl is not a closed system, which allows gas to escape when the bubbles pop.

• 160 grams; the bowl is not a closed system, creating gas bubbles that are too small to be weighed.

• 160 grams; the two substances are mixed in a closed system, creating a new substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ron observed a person making a campfire. He wrote down three observations to summarize what he observed. Observations 1. wood broken into smaller pieces 2. light and heat produced 3. smoke and ash produced During which observation(s) was Ron observing the formation of a new substance?

• Observation 1

• Observation 3

• Observations 1 and 3

• Observations 2 and 3

Tags

NGSS.MS-PS1-2

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

NGSS.MS-PS1-5

Hanna keeps a glass of ice on a window sill. After an hour, she observes a change as shown in the image. Which correctly compares the original substance to the new substance?

• The original substance was a solid, while the new substance is a gas.

• The original substance was a liquid, while the new substance is a gas.

• The original substance was a solid, while the new substance is a liquid.

• The original substance was a liquid, while the new substance is a solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Butter melting is an example of a

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-4

Curdling of milk is an example of a

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Cutting of vegetables is an example of a

• Chemical Change

• Physical Change