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Science 9 Chemistry Topics 7/8

Total questions: 56

Worksheet time: 33mins

Name
Class
Date
1.

When two or more substances undergo a rearrangement of their atoms to form new substances.

a)

Chemical Change

b)

Physical Change

c)

Combustion

d)

Corrosion

2.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
3.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
4.

The process by which one or more substances change to produce one or more different substances

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

5.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
6.

6CO2+ 6H2O → C6H12O6 + 6O26CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2  

The carbon atoms are balanced with ____ on each side of the reaction.

a)

1

b)

6

c)

2

7.

Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

8.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

9.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

10.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

11.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
12.
In this image, what are the information to the right of the arrow (in black) is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
13.
The law of conservation of mass states that....
a)
Matter can be made
b)
Matter can be destroyed
c)
Matter can neither be made or destroyed
d)
Matter can evaporate
14.
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
15.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
16.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
17.

The smallest amount of energy needed for a chemical reaction to begin is called its _______.

a)

activation energy

b)

excess reactant

c)

endothermicity

d)

limiting reactant

18.

Substances that are used to help speed up a reaction (without actually becoming a part of it) are called _______.

a)

limiting reactants

b)

inhibitors

c)

precipitates

d)

catalysts

19.

Evidence of an endothermic reaction is that it:

a)

gets hot

b)

gets cold

c)

gives off sounds

d)

gives off light

20.

B represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

21.

A represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

22.

D represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

23.

Which component of collision theory is represented in the image?

a)

Correct orientation of molecules

b)

molecules collide with sufficient energy

c)

Products become reactants

d)

Molecules form an activated complex

24.

Is the following reaction endothermic or exothermic

a)

endothermic

b)

exothermic

25.

which factor that affect reaction rate is represented?

a)

Temperature

b)

Catalyst

c)

Surface Area

d)

Concentration

26.

Indicate whether each of the following will: Increase / Decrease / have No effect on the rate of reaction.

 

                Decrease Reactant Concentration             

a)

Increase

b)

Decrease

c)

No Effect

27.

Which energy diagram line represents the catalyzed reaction?

a)

The black line

b)

The red line

c)

It can not be determined

28.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
29.

_____________ concentration of reactants by adding solute; ______________ concentration of reactants by adding solvent.

a)

Increase; Increase

b)

Decrease; Decrease

c)

Increase; Decrease

d)

Decrease; Increase

30.

What are the two necessary conditions in order for a chemical reaction to occur? (You may select more than 1 answer)

a)

Reactants must have a higher potential energy than products

b)

Particles must collide in the correct orientation.

c)

Particles must collide in the presence of a catalyst.

d)

Particles must have sufficient energy to overcome the activation energy.

31.

What do you call the minimum amount of energy required for a chemical reaction to occur?

a)

Potential energy

b)

Kinetic energy

c)

Activation energy

d)

Chemical energy

32.

Which of the following would slow down a reaction?

a)

Putting it in an ice bath

b)

Putting it in a hot bath

c)

Increasing the pressure

d)

Increasing the concentration

33.

5.0 g of catalyst was added to speed up the reaction. How much catalyst was left at the end of the reaction?

a)

more than 5.0 g

b)

exactly 5.0 g

c)

less than 5.0 g

d)

cannot be determined

34.

Why does coating with paint slow down the rusting of iron?

a)

The paint is an "anti-catalyst", causing opposite reaction to occur

b)

The paint cools down iron to slow down the reaction.

c)

The paint stops O2 from reacting with iron, decreasing the concentration of O2

d)

The paint decreases the surface area of iron, slowing down the rusting

35.

Energy is released when bonds are: (you must choose all the correct answers)

a)

Broken

b)

Formed

c)

Heated

d)

Cooled

36.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

37.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
38.

Increasing the pressure of a reaction vessel will.....

a)

Increase the reaction rate

b)

Decrease the reaction rate

39.

Decreasing the pressure of a reaction vessel will.....

a)

Increase the reaction rate

b)

Decrease the reaction rate

40.

Agitating a reaction vessel will increase the reaction rate because we are....

a)

Increasing collisions

b)

Decreasing collisions

c)

removing energy

d)

interfering

41.
Is this an example of corrosion?
a)
Yes
b)
No
42.

Rusting is a special term, given to the corrosion metal is... .

a)

Gold

b)

Platinum

c)

Iron

d)

Silver

43.

What are the two conditions that caused iron to rust ?

a)

Air and Oxygen

b)

Oxygen and Water

c)

Water and Carbon dioxide

d)

Carbon dioxide and Air

44.

Which of the following metals is not corroded by the environment

a)
Copper
b)
Gold
45.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)

boiling

c)

melting

d)
chemical reaction
46.
Iron rust in the presence of:
a)
Vacuum
b)
Moisture
c)
Oxygen
d)
Moisture and Oxygen
47.

What conditions are required for rusting?

a)

water only

b)

oxygen only

c)

water and oxygen

48.

Which diagram shows the most favourable conditions for rust to appear on the nail?

a)

A

b)

B

c)

C

d)

D

49.

Protection of iron by coating of zinc is called (a)  

50.

Adding a colourful outer layer to keep off H2O and O2

a)

Painting

b)

Greasing

c)

Dry coating

d)

Chroming

51.

Adding lubricating outer layer to keep off H2O and O2 off moving parts

a)

Painting

b)

Greasing

c)

Dry coating

d)

Chroming

52.

Adding a powder layer to keep off H2O and O2

a)

Painting

b)

Greasing

c)

Dry coating

d)

Chroming

53.

Electroplating a shiny metal to create a barrier to keep off H2O and O2

a)

Painting

b)

Greasing

c)

Dry coating

d)

Chroming

54.

Adding some metal that will corrode faster than our structure in order to have it corrode first

a)

Sacrificial anode

b)

Greasing

c)

Dry coating

d)

Chroming

55.

Hydrocarbon is made of what two elements?

a)

Carbon monoxide

b)

Hydrogen

c)

Carbon

d)

Oxygen

e)

Calx

56.

What is Combustion?

a)

reaction between substance (fuel, wood, paper clothes etc) and oxygen that releases Carbon dioxide and Water, with lots of energy.

b)

reaction between substance (fuel, wood, paper clothes etc) and carbon dioxide that releases oxygen and Water, with lots of energy.

c)

reaction between substance (fuel, wood, paper clothes etc) and water that releases Carbon dioxide and oxygen with lots of energy.

d)

Carbon dioxide is what we breathe out

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