Modeling Conservation of Mass

The law of Conservation of Mass states

• matter can be created and destroyed

• matter takes up space

• matter cannot be created or destroyed

• matter has a new mass after a chemical reaction

Tags

NGSS.MS-PS1-5

What are the starting materials in a reaction?

• product

• subscript

• coefficient

• reactants

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What is the substance that is formed after a chemical reaction called?

• product

• subscript

• coefficient

• reactants

Tags

NGSS.MS-PS1-2

What happens to atoms in a chemical reaction?

• they are destroyed

• they are created

• they are rearranged

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Lynn had 100 mg of water and 50 mg of salt. She then combined the water and the salt and a chemical reaction occurred. What is the mass at the end of her experiment?

• 50

• 100

• 150

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Does the image correctly represent the Law of Conservation of Mass?

• yes

• no

Tags

NGSS.MS-PS1-5

Does the image represent the Law of Conservation of

• yes

• no

Tags

NGSS.MS-PS1-5

There are ____ atoms of Cl in NaCl₂

Tags

NGSS.MS-PS1-1

There are ____ atoms of Na in NaCl₂

Tags

NGSS.MS-PS1-1

Select the equations that follow the Law of Conservation of Mass meaning the equation is balanced.

• H₂ + O₂ --> H₂O₂

• CO₂ --> Fe₂O₃

• Na Cl₂ --> 2NaCl

• Na₂ + 3H₂ --> 2NH₃

Tags

NGSS.MS-PS1-5