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Chemical Reactions

Total questions: 56

Worksheet time: 30mins

Name
Class
Date
1.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
2.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
3.

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

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

4.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
5.

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

6.

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

a)

Balanced

b)

Unbalanced

7.

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

a)

Balanced

b)

Unbalanced

8.

Determine whether the following equation is balanced or unbalanced. H2 + Br2 ---> 2HBr

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.
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
12.

Determine whether the following equation is balanced or unbalanced. 4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

13.
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
14.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
15.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
16.

_____are long chains of molecules that are made up of repeating units called monomers.

a)

Monomer

b)

Polymers

c)

cement

d)

oil

17.

Silk, rubber, wool, cellulose, petroleum are examples of ______.

a)

artificial polymers

b)

natural polymers

c)

oils

d)

chains

18.

Oranges are rich in vitamin __.

a)

D

b)

C

c)

E

d)

B

19.

Sugar and water are -----compounds.

a)

polar

b)

nonpolar

c)

ionic

d)

bond

20.

________________ is the ability of substances to dissolve in the solution

a)

solubility

b)

solute

c)

solvent

d)

mixture

21.

Gas production, color change, and precipitate formation shows ---- changes.

a)

physical

b)

chemical

c)

no

d)

I don't know

22.

Ex means --- and thermic means -----

a)

out, heat/energy

b)

in, air

c)

in, heat

d)

out, in

23.

The energy needs to start the chemical reaction is called ---- energy.

a)

activation

b)

final

c)

unknown

d)

initial

24.

In chemical changes, reactants are changed into -----

a)

same

b)

new products

c)

physical

d)

substrate

25.

The reactions that absorb the energy/heat from its surroundings are ----reactions.

a)

exothermic

b)

reaction

c)

endothermic

d)

new

26.

Soda

a)

Colloid

b)

Solution

c)

suspension

27.

Sand in water

a)

colloid

b)

solution

c)

suspension

28.

Sunscreen

a)

Colloid

b)

Solution

c)

Suspension

29.

Milk

a)

Colloid

b)

Solution

c)

Suspension

30.

Snow globe

a)

Colloid

b)

Solution

c)

Suspension

31.

Vinegar

a)

Colloid

b)

Solution

c)

Suspension

32.

Brass

a)

Homogenous

b)

Heterogeneous

33.

Mayonnaise

a)

Homogeneous

b)

Heterogeneous

34.

The part of a solution that does the dissolving

a)

solute

b)

solvent

c)

solution

d)

solubility

35.

What happens to the solubility of most solutes as the temperature increases?

a)

increase

b)

decrease

c)

stays the same

36.

Which of the following is the best description of a solution? (Choose all the correct answers)

a)

homogeneous

b)

cannot be separated using a filter

c)

a solute dissolved in a solvent

d)

does not scatter light

37.
The parts of a homogeneous mixture are   __________ throughout. 
a)
Same 
b)
Different 
c)
Neutral 
d)
Suspended 
38.
___________ is a combination of substances that can be physically separated. 
a)
Colloid 
b)
Mixture 
c)
Suspension 
d)
Compound 
39.
A mixture in which 2 liquids are mixed so evenly that it is not possible to see the separate particles 
a)
Solute 
b)
Solution
c)
Solvent 
d)
Suspension 
40.
A substances that dissolves in a liquid 
a)
Solvent
b)
Salt 
c)
Solute 
d)
Sugar 
41.
This type of mixture has particles that settle. 
a)
Suspension
b)
Colloid 
c)
Emulsion
d)
Solution 
42.
This type of mixture looks gel like and has moderate sized particles suspended 
a)
Suspension 
b)
Solute 
c)
Colloid 
d)
Solvent 
43.

The three types of mixtures are..

a)

solutions, solutes, solvents

b)

solutions, colloids, suspensions

c)

solutions, colloids, sediments

d)

concentrates, dilutes, dissolvers

44.

In a gas..

a)

particles are tightly backed

b)

particles vibrate slightly

c)

particles move freely

d)

particles shrink

45.

If a substance is soluble is means...

a)

that it can dissolve into another substance

b)

that it cannot dissolve into another substance

c)

it must be a concentrated substance

d)

it must be a diluted substance

46.

An example of an insoluble substance would be..

a)

cordial in water

b)

chocolate power in milk

c)

sugar in water

d)

oil in water

47.

A feature of a solution is..

a)

it is transparent

b)

it is colourless

c)

it is cloudy

d)

it is concentrated

48.

The word concentrated means a mixture is..

a)

weak

b)

strong

c)

disappearing

d)

reappearing

49.

A suspension is a mixture that has

a)

a solute and a solvent

b)

a sediment

c)

a cloudy appearance

d)

oil in it

50.

Which best describes the word sediment?

a)

a substance that something else can dissolve into

b)

small particles that easily dissolve

c)

medium sized particles that block light

d)

large particles that settle to the bottom of a mixture

51.

_________________ is an example of a solution, __________________ is an example of a colloid, _____________________ is an example of a suspension.

a)

cordial, sand and water, milk

b)

sand and water, milk, cordial

c)

milk, cordial, sand and water

d)

cordial, milk, sand and water

52.

Sugar and water

a)

Homogeneous

b)

Heterogeneous

53.

Oxygen

a)

Homogeneous

b)

Heterogeneous

c)

Compound

d)

Element

54.

A mixture that appears to be uniform while being stirred but which

separates into different phases when agitation ceases is a

a)

solvent.

b)

colloid.

c)

suspension.

d)

solute.

55.

Shaving Cream Foam

a)

Solution

b)

Suspension

c)

Colloid

56.

Paint

a)

Solution

b)

Suspension

c)

Colloid

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