Chemical Reactions and Counting Atoms

Which of the following lists all of the elements that are present in a molecule of potassium carbonate, K₂CO₃?

• Phosphate and calcium

• Potassium, carbon, and oxygen

• Argon and Oxygen

• Phosphorus, oxygen, and calcium

Tags

NGSS.MS-PS1-1

What would be the chemical formula for the molecule above

• CH₈

• C₈H

• CH₄

• C₄H

Tags

NGSS.MS-PS1-1

Which of the following would be evidence that a chemical change took place? Click all that apply.

• A solid melts at 200^oC

• A precipitate is formed

• A rock breaks in half

• Sugar Dissolves in Kool-Aid

• Light and heat are produced when a log burns

Tags

NGSS.MS-PS1-2

What does the Law of Conservation of Mass state?

• matter can always been created

• matter is always destroyed

• matter cannot be created or destroyed

• Matter can be destroyed, but never created

Tags

NGSS.MS-PS1-5

When two liquids are mixed together and a solid is formed, what do we call it?

• Metal

• A rock

• Precipitation

• Precipitate

Determine the number of atoms for each element in the compound: OC(NH₂)₂ O = C = N = H =

Tags

NGSS.MS-PS1-1

What does the red represent on the formula?

Tags

NGSS.MS-PS1-5

Determine the number of " Fe" atoms for each element in the compound: 5 Fe₂(SO₄)₃

Tags

NGSS.MS-PS1-1

The blue number represents the:

In the equation shown, what are the product(s)?

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2