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Test Review 8.P.1.3 and 8.P.1.4

Total questions: 30

Worksheet time: 18mins

Name
Class
Date
1.
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a)
12 atoms of carbon (C)
b)
6 atoms of carbon (C)
c)
3 atoms of carbon (C)
d)
2 atoms of carbon (C)
2.
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
a)
A physical change occurred.
b)
Atoms involved in the reaction lost mass.
c)
Precipitates were created in the new solution.
d)
Gases were released to the atmosphere.
3.
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
a)
During a chemical reaction, the total amount of matter stays the same.
b)
During a chemical reaction, matter is destroyed.
c)
During a chemical reaction, one or more new substances are formed.
d)
During a chemical reaction, the total number of atoms increases.
4.
What coefficient for O2 demonstrates the law of conservation of mass?
CH4(g) + __O2(g) → CO2(g) + 2H2O(g)
a)
1
b)
2
c)
3
d)
4
5.
Which is best represented by the equation?
2Mg + O2 → 2MgO
a)
Law of Conservation of Energy
b)
Law of Conservation of Mass
c)
Law of Superposition
6.
What is the importance of a closed container in a chemical reaction?
a)
to observe the mass before and after the reaction occurs
b)
to keep any materials from interfering with the reaction
c)
to observe the loss of mass after the reaction occurs
7.
Which equation is balanced according to the Law of Conservation of Mass?
a)
NaCl + Mg →
 MgCl2 + Na
b)
2NaCl + Mg → MgCl2 + Na
c)
2NaCl + Mg →
MgCl2 + 2Na
8.

Which of the following is a example of physical change ?

a)

burning of wood

b)

photosynthesis

c)

melting of ice-cream

d)

ripening of fruit

9.

What does the picture represent ?

a)

physical change

b)

chemical change

10.

Observe the picture and choose the correct option.

a)

Irreversible physical change

b)

Reversible physical change

11.

Which one is not the characteristics of a physical change ?

a)

They are changes in the physical properties of substance.

b)

They are irreversible

c)

Rearrangement of molecules take place

d)

No new substances are formed

12.

A chemical change may involve

a)

Evolution of gas

b)

Change in temperature

c)

Change in colour

d)

All of the above

13.

Which of the following is evidence of a physical change?

a)

New substance

b)

Shape Change

c)

Light produced

d)

Gas released.

14.
Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change. 
a)
Chemical then Physical 
b)
Physical then Chemical
c)
Both Physical
d)
Both Chemical
15.

What is the definition of chemical change?

a)

any change that results in the formation of one (or more) new chemical substance(s).

b)

changing of only the appearance of the object

c)

matter cannot be created or destroyed, only change form

d)

changes affecting the form of a chemical substance, but not its chemical composition.

16.
Which of the following is NOT a clue that a chemical reaction has taken place?
a)
Changing size
b)
Changing color
c)
A gas being formed
d)
Formation of a precipitate
17.
Define a physical property.
a)
Observations made or measured using your senses, without changing the identity of the substance
b)
Can only be measured using specific science equipment
c)
Only observed in situations where the identity of the object is changing
d)
Only measurable if the identity of the object changes  
18.

Choose every image that represents a chemical change.

a)
b)
c)
d)
19.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
20.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
21.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
22.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
23.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
24.

 C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2  
Given this chemical equation, what are the REACTANTS?

a)

 C2H6 and 5O2C_2H_{6\ }and\ 5O_2  

b)

 2CO2 and 3H2O22CO_2\ and\ 3H_2O_2  

25.

Observe the reaction shown here. The formula for this equation is  N2 + H2 → NH3N_2\ +\ H_2\ \rightarrow\ NH_3  . What do you observe about the atoms of nitrogen in this reaction?

a)

There are 2 atoms of nitrogen in the reactants and only 1 in the products. This violates the Law of Conservation of Mass.

b)

There are 2 atoms of nitrogen in the reactants and 3 in the products. This violates the Law of Conservation of Mass. 

c)

There are 2 atoms of nitrogen in the reactants and 2 in the products. This is in line with the Law of Conservation of Mass. 

26.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
27.
What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl3  +  3H2
a)
2
b)
4
c)
3
d)
6
28.

Combustion is an .................Process

a)

Endothermic

b)

Exothermic

c)

Both (a) and (b)

d)

None of the above

29.

A chemical reaction that absorbs energy in the form of heat is described as

a)

endothermic

b)

exothermic

c)

combustion

d)

unbalanced

30.

The principle of conservation of mass is true

a)

only for reactions that take place in open systems

b)

only for reactions that take place in closed systems

c)

for reactions in both open and closed systems

d)

for no reaction at all

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