Chemical

The list shows what a student records when they observe a burning candle.

Which of the following observations of the burning candle indicate a chemical change?

• I, II, and III

• II and III, only

• I and II, only

• I and III, only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Vinegar is added to milk. Clumps of white solid are formed that can be separated from the remaining clear liquid. There is no noticeable temperature change. The evidence for chemical change is the...

• constant temperature of the substances.

• separation of two substances.

• odor of the substances.

• formation of a solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In which of the following processes does a new substance form?

• Cooling

• Crushing

• Burning

• Evaporating

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following indicates a chemical change may have occurred?

• The separation of two liquids

• The disappearing of a solid in a liquid

• The formation of a solid

• The breaking apart of a solid into small pieces

Tags

NGSS.MS-PS1-2

Ling measured out 45 grams of vinegar and 10 grams of baking soda. When she mixed them together, bubbling occurred. After the bubbling stopped, she weighed the mixture and found that it weighed 54 grams. Which of the following best explains why the mixture weighs less than the original ingredients?

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

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

• Some of the vinegar evaporated during the experiment.

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When Bobby and his parents first moved into their house, the brick fireplace was very clean. Now that they have built a few fires in their fireplace, the inside is covered with black powder. Bobby's mother tells him that this powder is called soot. Which of the following best explains how the soot came to be in the fireplace?

• A chemical reaction occurred when the wood burned, making a new substance called soot.

• A chemical reaction occurred between the bricks and air, making a new substance called soot.

• The wood in the fireplace evaporated, making a new substance called soot.

• Some of the bricks in the fireplace melted, making a new substance called soot.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes a chemical change?

• Ice goes from solid to liquid when melting

• Water goes from liquid to gas when boiling

• Steam loses heat when condensing

• Gray iron turns reddish-brown when rusting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Duane left his bicycle outside in the rain for several days. He notices some spots on the bicycle's iron frame have changed color from silvery-gray to reddish-orange. These spots are also rough to the touch. The rest of the frame is smooth. Which statement best describes what has happened?

• The water chemically reacted with the iron to form a new substance

  called rust.

• The water cooled the iron, which caused it to solidify into a substance called rust.

• The water coated the iron and cooled to form a reddish-orange solution called rust.

• The water eroded the outer layer of the iron to expose a solution

  called rust.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student makes the list below to show her observations of a fireworks show.

Which of the observations indicate that a chemical change has occurred?

• I, II, III, IV, only

• IV and V, only

• III, only

• I, II, III, IV, and V

Tags

NGSS.MS-PS1-2

Which of the following actions will cause a change in shape due to a chemical reaction?

• Spilling a glass of juice

• Burning a piece of paper

• Sawing a piece of wood in half

• Forcing air into a balloon

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5