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Law of Conservation of Matter/Mass

Total questions: 28

Worksheet time: 38mins

Name
Class
Date
1.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
2.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
3.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
4.
An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?
a)
15 grams
b)
25 grams
c)
20 grams
5.
The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.
a)
disappears
b)
stays the same
c)
weighs less
d)
explodes
6.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
7.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
8.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

9.

Which Chemical Equation is Balanced?

a)

Fe4+O2------4FeO2+O2

b)

2H2+O2-----2H2O

c)

3Cr+4O₂-----2Cr₂O₃

10.

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

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

a)

4g

b)

5g

c)

9g

d)

14g

11.
If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 
a)
2
b)
4
c)
6
d)
You need more information to answer this question
12.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
13.

What is the right part of a chemical equation called?

2H2 + O2 --> 2H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

14.

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

a)

20 g

b)

15 g

c)

10 g

d)

3 g

15.

Which section represents the yield sign?

a)

A

b)

B

c)

C

16.

Why does this picture demonstrate the Law of Conservation of Mass?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Mass

17.

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

a)

the mass would decrease

b)

the mass would increase

c)

the mass would stay the same

d)

it depends on the type of reaction

18.

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

a)

the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

b)

the mass would increase because mass was created

c)

the measurable mass would stay the same because nothing would be able to leave the system.

d)

it depends on the type of reaction

19.

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

a)
b)
c)
d)
20.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

Produce

21.
Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?
a)
50 g
b)
100 g
c)
200 g
d)
400 g
22.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because more info is needed.

c)

No, because there are more atoms in the product.

d)

No, because there are more atoms in the reactant.

23.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

24.

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

a)

250 grams

b)

380 grams

c)

375 grams

d)

400 grams

25.

Does this picture accurately show the Law of Conservation of Mass?

a)

Yes

b)

No

26.

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

a)

100 g

b)

93 g

c)

7 g

d)

0 g

27.

How many grams of CHOCOLATE POWDER are shown in the example of conservation of mass below?

a)

450 g

b)

465 g

c)

0 g

d)

15 g

28.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information

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