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PTE & Conservation of Mass

Total questions: 30

Worksheet time: 55mins

Name
Class
Date
1.

What is Helium's atomic number?

a)

1

b)

2

c)

3

d)

4

2.

Chlorine

a)

C

b)

Ch

c)

Cl

d)

Co

3.

Sodium

a)

S

b)

So

c)

Sm

d)

Na

4.

Calcium

a)

Ca

b)

C

c)

K

d)

Cl

5.

Nitrogen

a)

Na

b)

N

c)

Ni

d)

No

6.

Hydrogen

a)

H

b)

Hy

c)

Hd

d)

Hn

7.

Oxygen

a)

O

b)

Ox

c)

Oy

d)

Og

8.

Carbon

a)

C

b)

Ca

c)

Co

d)

Cn

9.

Compare the reactants and products in the diagram.  What do you notice?  Check all that apply.

a)

The reactant molecules are different from the product molecules.

b)

The reactant atoms are different from the product atoms

c)

The total number of reactant molecules is different from the total number of product molecules. 

d)

The atoms become associated together in new arrangements.

10.

True or false: The total number of atoms differs between the reactants and products in this chemical reaction. CH4+2O2→CO2+2H2OCH_4+2O_2→CO_2+2H_2O  

a)

True

b)

False

11.

What is underlined in the chemical equation below?

Na + Cl ---> NaCl

a)

Products

b)

Reactants

12.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
13.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
14.

The Law of Conservation of Mass says that matter can neither be __________ or __________.

a)

created; destroyed

b)

recycled; renewed

c)

subtracted; added

d)

joined; separated

15.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
16.
Is this equation balanced or unbalanced? 
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
17.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
18.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

19.
The red numbers in the image below represent ________.
a)
subscripts
b)
coefficients
c)
I don't know.
d)
None of the answers are correct.
20.
The blue numbers in the image below represent ________.
a)
I don't know.
b)
coefficients
c)
subscripts
d)
None of the answers are correct.
21.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO 
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
22.
In a chemical reaction, everything to the right of the arrow are called ______________.
a)
products
b)
yields
c)
molecules
d)
reactants
23.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
24.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
25.

what is a balanced equation?

a)

the number of each type of atom on the reactant side must equal the number of each type of atom on the product side

b)

the number of each type of atom on the reactant side must not equal the number of each type of atom on the product side

26.

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

27.

When a log is burned, what happens to the wood?

a)

The mass stays the same, but becomes smoke and ash.

b)

It disappears.

c)

The mass changes as it goes away.

d)

Nothing. You're imagining things.

28.

A process in which atoms rearrange to form new substances.

a)

extended structure

b)

boiling point

c)

chemical reaction

29.
What is the law of conservation of mass?
a)
The amount of matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants equals the mass of the products
d)
The mass of the products is different than the mass of the reactants.
30.
Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
a)
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
b)
Bubbles were produced during the reaction, which meant that a gas was being produced.
c)
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
d)
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

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