wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Unit 3.1

Total questions: 25

Worksheet time: 24mins

Name
Class
Date
1.

Does this follow the law of conservation of mass:

Yes or No


3HgO → 2Hg + O2

a)

Yes

b)

No

2.

Does this follow the law of conservation of matter?

Yes No


Al2 + O3→ Al2O3

a)

Yes

b)

No

3.

What are the REACTANTS :

H2O + CO2 → HCO + HO

a)

H2O + CO2

b)

HCO + HO

c)

H2O ONLY

d)

HCO ONLY

4.

Which compounds are the PRODUCTS of this reaction?

a)

CO2 + H2O

b)

C6H12O6 + O2

c)

C6H12O6 + CO2

d)

H2O + O2

5.
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.
6.

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

a)

His chemical reaction defied the law of conservation of mass

b)

The product destroyed mass during the reaction

c)

The reactants created matter during the reaction

d)

The gas that was produced was not able to be weighed since the container was open.

7.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
8.

Candle wax is an example of..

a)

a homogenous mixture

b)

a heterogenous mixture

c)

a compound

d)

an element

9.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
10.

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

11.
Law of conservation of mass states that 
a)
matter is created
b)
matter is destroyed
c)
matter is neither created nor destroyed
d)
matter does not change
12.
If an atom or molecule DOESN'T have a subscript or coefficient, what number should be used for that atom/molecule? 
a)
0
b)
1
c)
2
d)
No number should be used
13.
A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids –
a)
were pure substances before they were mixed.
b)
are toxic and should be handled with extreme caution.
c)
have gone through a chemical change in which a new substance called a precipitate was produced.
d)
have been stored too long and are no longer good.
14.
Which of the following is NOT an example of a chemical change?
a)
burning match
b)
a car rusting
c)
baking a cake
d)
melting ice
15.
Which shows evidence that a chemical change has occurred?
a)
slicing potato
b)
apple/potato turns brown
c)
biting apple
d)
peeling apple/potato
16.

Which of the following is a physical change?

a)

precipitate

b)

color change

c)

unexpected change in temperature (colder, hotter)

d)

gas/bubbles

17.
All of the following are evidence of a chemical change EXCEPT-
a)
change in state of matter
b)
formation of a gas
c)
color change
d)
precipitate forms
18.
REACTANTS are always on what side of the chemical equation?
a)
right
b)
left
c)
top
d)
bottom
19.
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
20.
compounds are chemically bounded together 
a)
False
b)
true
c)
I don't know?
21.
Are there any compounds on the periodic table 
a)
yes there are many 
b)
no because only elements are on the periodic table
c)
I think they are?
22.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
23.
A combination of substances that are not chemically combined is called a(n)____________. 
a)
mixture
b)
compound
c)
physical
24.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
25.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

Similar Resources on Wayground

7.1 Air

20 questions

7.1 Air

quiz

Worksheet

•

7th - 9th Grade

Quiz 5. Electron Configuration (MENDEL)

20 questions

Quiz 5. Electron Configuration (MENDEL)

quiz

Worksheet

•

8th Grade

chương 1 hoa 8

20 questions

chương 1 hoa 8

quiz

Worksheet

•

8th Grade

ÔN TẬP CHỦ ĐỀ 1

20 questions

ÔN TẬP CHỦ ĐỀ 1

quiz

Worksheet

•

1st - 12th Grade

Chemical Reactions

21 questions

Chemical Reactions

quiz

Worksheet

•

8th Grade

Density

25 questions

Density

quiz

Worksheet

•

8th - 12th Grade

Átomos y Tabla periódica

20 questions

Átomos y Tabla periódica

quiz

Worksheet

•

1st Grade - University

Atoms & its parts

25 questions

Atoms & its parts

quiz

Worksheet

•

7th - 9th Grade