Law of Conservation of Mass & Matter

Law of Conservation of Mass & Matter

by Ms. Felder

Multiple Choice

Ice melting is a ______ change.

• physical

• chemical

Multiple Choice

Rust forming on a metal fence is a ______ change.

• physical

• chemical

Multiple Choice

Substances present BEFORE the chemical reaction occurs.

• reactants

• products

Multiple Choice

Substances present AFTER the chemical reaction occurs.

• reactants

• products

Multiple Choice

The two substances in the flask as this point are _________.

• products

• reactants

Open Ended

Why is a stopper placed on the flask?

​Lead Nitrate reacted with Potassium iodide to produce lead iodide and postassium nitrate.

Multiple Choice

Lead Nitrate reacted with Potassium iodide

to produce lead iodide and postassium nitrate.

The mass of the reactants & products are exactly the same.

• true

• false

Multiple Choice

Lead Nitrate reacted with Potassium iodide

to produce lead iodide and postassium nitrate.

The reactants & products are exactly the same.

• true

• false

Multiple Choice

How many atoms of iron (Fe) are there in the reactant?

• 8

• 4

• 2

Multiple Choice

How many iron (Fe) atoms are in the product?

• 8

• 4

• 2

Multiple Choice

How many atoms of oxygen (O) are there in the reactant?

• 3

• 6

• 2

Multiple Choice

How many atoms of oxygen atoms are in the product?

• 3

• 6

• 2

Multiple Choice

In a chemical reaction/change, the mass of the reactants is ______________ the mass of the products

• always less than

• different than

• always equal to

Multiple Choice

What is the total mass of the reactants?

• 158.72 g

• 118.7 g

• 40.02 g

Multiple Choice

So what does the mass of the products have to be?

• 118.7 g

• 40.02 g

• 158.72 g

Multiple Choice

How can we figure out how much hydrogent is in the product?

• subtract the mass of tin fluride in the product from the total mass of the reactants

• Add the tin floride to the hydrogen in the product

• add the tin floride to the total mass of the reactants

• Subtract the total mass of the reactants from the tin floride in the product.

Open Ended

What does the Law of Conservation of Matter State?

Open Ended

In a chemical reaction, the mass of the reactants always equals the ______ of the _________,