wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Atoms and Compounds

Total questions: 45

Worksheet time: 10mins

Name
Class
Date
1.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
2.
a substance that is formed as the result of a chemical reaction
a)
Product 
b)
Reactant
c)
Starters
d)
Enders
3.

Which of the following is more reactive?

a)

Calcium

b)

Nickel

c)

Zinc

d)

Magnesium

4.

Will the following reaction take place?


Ni + NaCl ->

a)

NO

b)

YES

5.
A displacement reaction will occur when...
a)
a more reactive metal displaces a less reactive metal from its compound.
b)
A less reactive metal displaces a more reactive metal from its compound
c)
Displacement only occurs when two of the same metals are reacted 
d)
Displacement reactions will only occur in metals above iron in the reactivity series
6.
Which of the following will not undergo reaction?
a)
zinc metal  +  zinc oxide 
b)
iron metal  +  copper oxide
c)
zinc metal +  iron oxide
d)
magnesium  +  iron oxide
7.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
8.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
9.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
10.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
11.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
12.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
13.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
14.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
15.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
16.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
17.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
18.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
19.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
20.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
21.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

22.

When heat is released it is an

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

23.

Evidence of a chemical reaction is when 2 substances react, they

a)

stay the same

b)

form a new substance

c)

both

d)

none

24.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

25.

An ice pack in an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

26.

Sodium and chlorine combine in an explosive reaction to form table salt.

a)

Endothermic

b)

Exothermic

27.

Water freezes on the pavement and the roads become icy.

a)

Endothermic

b)

Exothermic

28.

Cellulose is a ____ polymer

a)

Natural

b)

Synthetic

29.

Starch is a ____ polymer

a)

Natural

b)

Synthetic

30.

Plastic is a _____ polymer

a)

Natural

b)

Synthetic

31.

Which of the following is a NOT a key material in ceramic processing

a)

Clay

b)

Iron

c)

Feldspars

d)

Quartz

32.

A composite is made of three or more materials.

a)

True

b)

False

33.

The main ingredient in glass is SiO2 (sand)

a)

True

b)

False

34.

Ceramics are heated to 1000C to drive out water and harden it.

a)

True

b)

False

35.

Composite materials are made to combine and create new and improved useful properties

a)

True

b)

False

36.
Which of the following is the product of the reaction of aluminium and oxygen?
a)
aluminium oxide.
b)
metal oxide
c)
aluminium ore
d)
aluminium and oxygen
37.
Which of the following reactions produces calcium oxide?
a)
calcium and oxide
b)
calcium and water
c)
calcium and air
d)
calcium and oxygen
38.
Which of the following defines oxidation?
a)
A chemical reaction where a substance gains oxygen.
b)
A chemical reaction where a substance loses oxygen.
c)
A chemical reaction where a substance loses a metal.
d)
A chemical reaction where a substance gains a metal.
39.
Which of the following is an example of an oxidation reaction?
a)

2Ca  +   O2 --> 2CaO

b)

Na2O  + H2O --> 2NaOH

c)

Fe2O3   + 3CO --> 2Fe   +  3CO2

d)
All of the choices are oxidation reactions.
40.

compound ---> element + element

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

41.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

42.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles - 
a)
could show that a gas is forming
b)
always rise to the top of a liquid. 
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
43.
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?
a)
Experiment 1
b)
Experiment 2
c)
Experiment 3
d)
Experiment 4
44.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
45.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter

Similar Resources on Wayground

cahaya kls 8

40 questions

cahaya kls 8

quiz

Worksheet

•

8th Grade

SISTEM PENCERNAAN

45 questions

SISTEM PENCERNAAN

quiz

Worksheet

•

8th Grade

IPA_8A/B/C_PTS_GASAL

40 questions

IPA_8A/B/C_PTS_GASAL

quiz

Worksheet

•

8th Grade

G8 Final Exam Review - Part 2

50 questions

G8 Final Exam Review - Part 2

quiz

Worksheet

•

8th Grade

PTS IPA KELAS 8 SMP TARSISIUS 2 JAKARTA

45 questions

PTS IPA KELAS 8 SMP TARSISIUS 2 JAKARTA

quiz

Worksheet

•

8th Grade

Chemical Reactions by Schott

41 questions

Chemical Reactions by Schott

quiz

Worksheet

•

7th - 9th Grade

Unit 1 & 2 Test Review

48 questions

Unit 1 & 2 Test Review

quiz

Worksheet

•

8th Grade

Révision sur l’univers matériel

50 questions

Révision sur l’univers matériel

quiz

Worksheet

•

8th Grade