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Ling is learning about chemical reactions in Science class. She measured out 45 grams of vinegar and 10 grams of baking soda. When she mixes them together, a bubbling reaction occurs. After the reaction has stopped, she weighs the mixture and finds that it weighs 54 grams. Which of the following best explains why the mixture now weighs less than the original ingredients?

• Some of the vinegar evaporated during the experiment.

• The chemical reaction created a gas that left the mixture.

• The new solution is less dense than vinegar or baking soda.

• The baking soda is floating on top of the vinegar.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sameh put a mixture of yeast, water, and sugar into a balloon. The picture shows his balloon when he started and what it looked like 1 hour later. What kind of change did he observe?

• physical change

• chemical change

• scientific change

• geological change

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NGSS.MS-PS1-2

Which property of the candle wax changed when the flame heated the top of the candle?

• color

• state

• volume

• weight

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

Water can be a solid, a liquid, or a gas. The state of water can change as its temperature changes. Which of the following is a change in the state of water that could occur?

• changing a gas directly to a solid by increasing the temperature

• changing a gas directly to a liquid by increasing the temperature

• changing a solid directly to a liquid by decreasing the temperature

• changing a liquid directly to a solid by increasing the temperature

Tags

NGSS.MS-PS1-4

Micah placed a beaker of water on a hot plate. When bubbles started coming to the top of the water, he made the first sketch. After 5 min, Micah made the second sketch. What happened during the 5 min that Micah was observing the beaker of water?

• Water was changed into energy during a chemical change.

• Water was changed into a different state during a physical change.

• Water was changed into a different material during a physical change.

• Water was changed into a different material during a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Select the two changes that are physical changes from the options below.

• Melting ice and tearing paper

• Burning wood and rusting iron

• Burning wood and melting ice

• Rusting iron and tearing paper

Jo observed some changes and made a table of chemical changes and physical changes. Chemical changes | Physical changes -----------------|----------------- burning leaves | tearing paper toasting a bagel | sharpening a pencil baking a loaf of bread | pouring milk into a glass crumpling aluminum foil into a ball | freezing water into ice cubes Which change did Jo put in the wrong column?

• sharpening a pencil

• baking a loaf of bread

• pouring milk into a glass

• crumpling aluminum foil into a ball

Tags

NGSS.MS-PS1-2

Which of the following is correct about how temperature can affect physical changes and chemical changes?

• The temperature would need to be decreased for a substance to change from a gas to a solid.

• Gaseous water could change to liquid water by decreasing the temperature rather than increasing the temperature.

• Decreasing the temperature could change solid water to liquid water.

• Liquid water could change to solid water by decreasing the temperature rather than increasing the temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Understand how temperature can affect physical changes and chemical changes.

• A. Breaking the shell of an egg

• B. Breaking the shell and making the egg solid

• C. Evaporation of water

• D. Adding heat to cause new chemical substances with different properties to form.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is a chemical change?

• Sharpening a pencil

• Baking a loaf of bread

• Pouring a glass of milk

• Crumpling aluminum foil into a ball

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5