Physical and Chemical Changes

What is true about deposition?

• It is an endothermic process.

• It is a chemical reaction.

• Particles slow down.

• An explosion is triggered.

During a phase transition:

• Energy is released or energy is absorbed.

• Molecules become larger or smaller.

• 1. A chemical reaction occurs.

• 1. Salt is dissolved. 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is always true about Matter?

• It is solid to the touch.

• 1. It has mass and takes up space.

• It can be made up of molecules or energy.

• 1. It is always an element.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What is an example of an exothermic process?

• Boiling water.

• 1. Deposition of water.

• 1. Sunlight warming the surface of a lake.

• 1. Particles spreading apart.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

NGSS.MS-PS3-3

Select all of the following that are true for an endothermic phase transition of a compound (there may be more than one correct answer).

• Energy goes into the compound.

• 1. Protons are released.

• 1. Molecules spread apart and move faster.

• A chemical reaction is triggered.

Tags

NGSS.MS-PS1-4

The difference between an element and a compound is:

• 1. A compound can’t exist as solid, liquid, or gas while an element can.

• 1. Compounds do not contain protons, neutrons, and electrons while elements do.

• Elements have chemical properties but molecules do not.

• The smallest particle of an element is an atom while the smallest particle of a compound is a molecule.

Tags

NGSS.MS-PS1-1

Chemical properties of a substance:

• 1. Describe the number of chemicals in the substance.

• Describe the appearance of the substance.

• Describe how the substance reacts chemically with other substances.

• 1. Describe the structure of the molecules in the substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select all the items that are true when molecules or atoms of a substance move closer together and slow down.

• 1. The substance releases energy.

• 1. The substance absorbs energy. 

• An exothermic process occurs.

• An endothermic process occurs.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A precipitate is:

• 1. The result of a physical change.

• The result of a chemical reaction.

• Can be the result of either a chemical reaction or a physical change.

• 1. A result of burning.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• Burning of wood
• Rusting of iron
• Baking a cake
• Melting of ice

Tags

CH.PS1.1