Conservation of Mass and Balancing Equations

In the following reaction: 2NaN₃ decomposes to form 2Na + 3N₂. If 500 grams of NaN₃ decomposes to form 323 grams of N₂. How much Na is produced?

• 100 grams

• 177 grams

• 323 grams

• 500 gram

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a chemical reaction matter cannot be created or destroyed.

• True

• False

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-5

To balance an equation you should:

• ONLY change subscripts.

• ONLY change coefficients.

• Change BOTH subscripts and coefficients.

Balance this equation: H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Tags

NGSS.MS-PS1-5

What is the Law of Conservation of Mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

• Mass is never created or destroyed

Tags

NGSS.MS-PS1-5

In reaction A +B --> C, reactants A + B have a total mass of 9g. What is the mass of product C?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In reaction A +B --> C, reactant A has a mass of 4g and product C has a mass of 9g. What is the mass of reactant B

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Hydrogen atoms must be present in the products after a reaction between the following reactants: 2SO_2 + 2H_2O_2

• 2

• 3

• 4

• 8

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5