Conservation of Matter

1.

Multiple Choice

3 mins

1 pt

An oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

15 grams

25 grams

20 grams

2.

Multiple Choice

3 mins

1 pt

If reaction starts with 25g of reactants, it will produce ---

a total of 40g of product

a total of 10g of product

a total of 80 g of product

a total of 25g of product

3.

Multiple Choice

3 mins

1 pt

How many of each type of atom are in the formula NH₃?

1 nitrogen, 3 hydrogen

3 nitrogen, 3 hydrogen

1 neon, 3 hydrogen

1 nitrogen, 3 helium

4.

Multiple Choice

3 mins

1 pt

How many molecules are represented in the formula 3CO₂?

3 carbon, 2 oxygen

6 molecules of CO₂

3 molecules of CO₂

3 carbon, 6 oxygen

5.

Multiple Choice

5 mins

1 pt

In a reaction A + B ----> C.

Reactant A has 5g

Product C has 9g.

How many grams does reactant B should have?

4g

5g

9g

14g

6.

Multiple Choice

3 mins

1 pt

What will have more mass when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?

They both will have the same mass

The product always has more mass than the reactant

The reactant will have more mass than the product

They both will lose mass after the reaction

7.

Multiple Choice

2 mins

1 pt

If there are 4 Hydrogen atoms on the reactant side, how many Hydrogen atoms will be on the product side?

2

4

6

You need more information to answer this question

8.

Multiple Choice

5 mins

1 pt

Is the equation balanced?

2H₂O + O₂ = 4MgO + 3Fe

Yes

No

9.

Multiple Choice

5 mins

1 pt

Balance this equation:

MgCl₂ = Mg₄+ Cl₂

It's already balanced.

4 MgCl₂ = Mg₄+ 4 Cl₂

4 MgCl₂ = Mg₄+ 5 Cl₂

10.

Multiple Choice

5 mins

1 pt

Balance this equation:

2 Li + Cl₂ = LiCl

2 Li + Cl₂ = 4 LiCl₂

2 Li + Cl₂ = 2 LiCl

11.

Multiple Choice

5 mins

1 pt

How many atoms of aluminum are on each side of the following equation?

4Al + 3O₂= 2Al₂O₃

2

6

1

4

12.

Multiple Choice

2 mins

1 pt

Matter is anything that ---

takes up space and has mass.

only found on Earth.

is light, sound or ideas.

13.

Multiple Choice

2 mins

1 pt

The Law of Conservation of Matter states that the total amount of matter _____ after it undergoes change.

disappears

stays the same

weighs less

explodes

14.

Multiple Choice

2 mins

1 pt

What is the left part of a chemical equation called?

2H_{2 +}O₂ = 2H₂O

Reactants

Products

Yields

Chemical Equation

15.

Multiple Choice

2 mins

1 pt

What is the right part of a chemical equation called?

2H_{2 +}O₂ = 2H₂O

Reactants

Products

Yields

Chemical Equation

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