Matter and Their Interaction Review

How does a balanced equation satisfy the Law of Conservation of Mass?

• The total number of atoms increases.

• One or more new substances are formed.

• Matter is destroyed.

• The total amount of matter stays the same.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Why is it important to have a chemical reaction occur in a closed system to illustrate Law of Conservation of mass?

• To let the gasses escape.

• So any gasses produced do not escape.

• Only way to see a chemical change.

• So the precipitate does not escape.

Tags

NGSS.MS-PS1-5

Which best describes the molecules of a solid?

• They are free floating.

• They are packed tightly together.

Can temperature change the rate of solubility of a substance?

• Yes, higher temperature means more solids will dissolve and less gasses will dissolve.

• No, temperature does not affect solubility.

Tags

NGSS.MS-PS1-4

Which problem is balanced?
(Check ALL answers)

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes

• no

Tags

NGSS.MS-PS1-5

Count the atoms for each element and select the correct answer:

• H = 3

  O = 3

• H = 6

  O = 1

• H = 2

  O = 1

• H = 6

  O = 3

Tags

NGSS.MS-PS1-1

Boiling water. Is this change physical or chemical?

• It is a physical change.

• It is a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Because of the Law of Conservation of Mass, chemical equations should be balanced (same atoms counts for elements in both the reactants and products)

• True

• False

Tags

NGSS.MS-PS1-5

What is a consumer in an ecosystem?

• An organism that obtains energy by photosynthesis.

• An organism that obtains energy by consuming other organisms or organic matter.

• An organism that produces energy by consuming other organisms or organic matter.

• An organism that obtains energy from inorganic sources.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3