Chemical Reactions 2

Marie and Fatima are watching icicles melt off a roof. Which type of change is occurring?

• Chemical change

• Physical change

• Biological change

• Emotional change

Answer explanation

The icicles melting off Delia's roof is an example of a physical change, as it involves a change in state from solid to liquid without altering the chemical composition of the icicles.

Tags

NGSS.MS-PS1-4

During a science experiment, Mr. Dub observed a substance in the lab. Which of the following occurs during the physical change he observed?

• The substance's atoms rearrange.

• The appearance changes.

• The substance changes color.

• The substance changes state.

Answer explanation

During a physical change, the appearance of the substance changes, while the substance's atoms do not rearrange.

During a science experiment, Jordan and Marie observed a chemical change. Which of the following did they most likely observe?

• Formation of new substances

• Change in physical appearance

• Change in temperature

• Change in state of matter

Answer explanation

During a chemical change, the formation of new substances occurs, distinguishing it from physical changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a science class, Ms.G asked her students to identify an example of a physical change. Which of the following did Sneijdre choose?

• Burning paper

• a cake being baked

• an explosion

• Breaking a glass bottle into pieces

Answer explanation

Breaking a glass bottle into pieces is an example of a physical change because the glass is only being physically altered without any chemical changes occurring.

A melting bowl of ice cream at Jordan's birthday party, which was beautifully organized by Ms. G, is an example of a __________.

• solidification process

• chemical change

• sublimation reaction

• physical change

Answer explanation

A melting bowl of ice cream is an example of a physical change because it changes from a solid to a liquid state without altering its chemical composition.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When Marie dissolves baking soda in water during a science experiment, she is watching a __________.

• physical change

• chemical change

Answer explanation

When you dissolve baking soda in water, it is a physical change because no new substances are formed, only the state of the baking soda changes from solid to dissolved in water.

Tags

NGSS.MS-PS1-4

Jaden and Fatima shred newspaper to put in their pet gerbil’s cage. Jaden says they chemically changed the properties of the newspaper. Fatima says they physically changed the properties of the newspaper. Who is correct?

• Fatima

• Jaden

• The gerbil

Answer explanation

DeShawn is correct because shredding newspaper only causes a physical change, not a chemical change in the properties of the newspaper.

Tags

NGSS.MS-PS1-2

Sneijdre and Mr. Dub mixed two substances in a scientific experiment and watched as one of the substances dissolved in the other substance. Which type of change occurred?

• chemical

• physical

Answer explanation

The correct type of change that occurred when Tara mixed the two substances in the experiment is physical, as one substance dissolved in the other without any chemical reaction taking place.

Tags

NGSS.MS-PS1-2

Marie, Jaden, and Mr. Dub mixed two substances in a scientific experiment and caused an explosion. Which type of change likely occurred?

• chemical

• physical

Answer explanation

The likely type of change that occurred when Juan mixed two substances and caused an explosion is a chemical change, as chemical reactions often involve the release of energy in the form of heat, light, or sound.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which type of change does NOT appear to be occurring when ice melts in the sun, as observed by Angeles and Steven?

• Chemical change

• Physical change

Answer explanation

The correct answer is a chemical change because when ice melts in the sun, it undergoes a physical change from solid to liquid, not a chemical change involving a change in chemical composition.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4