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chemical reactions

Total questions: 60

Worksheet time: 50mins

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.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
6.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
7.
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
8.

Which example provides evidence of a chemical change?

a)

Wood releases ash and smoke when burned.

b)

Rock particles separate when soil is being sifted.

c)

Boiling water bubbles when being heated.

d)

Sugar is not visible when dissolved in water.

9.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

10.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

11.

NaHCO3 is an example of

a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
12.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and 2 H2O

d)

O2 and H2O

13.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
14.
The left side of the equation below is called
a)
Products
b)
Reactants
15.

Which observation(s) might be used as evidence that a chemical reaction occurred?

a)

Color change

b)

Odor change

c)

change in temperature

d)

All of the above

16.

The rate of a chemical reaction is NOT affected by which of the following:

a)

temperature

b)

concentration

c)

particle size (surface area)

d)

All of these affect reaction rates

17.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
18.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
19.

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

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

20.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
21.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
22.

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

23.

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

a)

Balanced

b)

Unbalanced

24.

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

a)

Balanced

b)

Unbalanced

25.

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

a)

Balanced

b)

Unbalanced

26.

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

a)

Balanced

b)

Unbalanced

27.

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

28.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Coefficient
29.
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
30.
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
31.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
32.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
33.

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

a)

Balanced

b)

Unbalanced

34.
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
35.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
36.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
37.

Check ALL the boxes that show the signs of a chemical change.

a)

smell

b)

air

c)

color change

d)

gas (bubbles) produced

e)

forces

38.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
39.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
40.

The reactants in the image above are:

a)

CH4 and 2 O2

b)

2 H2O and CO2

c)

All of these are reactants

d)

All of these are products

41.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

42.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
43.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
44.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
45.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
46.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
47.

In reactions, products must be equal to..

a)

Products

b)

Reactants

c)

Starters

d)

Enders

48.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
49.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
50.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
51.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
52.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
53.
Ice melting
a)
Chemical Change
b)
Physical Change
54.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
55.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
56.

In reactions, products must be equal to..

a)

Products

b)

Reactants

c)

Starters

d)

Enders

57.

According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?

a)

The amount of atoms on each side is equal

b)

The amount of atoms on the product side is greater

c)

The amount of atoms on the reactant side is greater

d)

Depends on the reaction

58.

Balance the following chemical equation:

____KClO3 → ____KCl + ____O2

a)

2KClO3 → 4KCl + O2

b)

4KClO3 → 2KCl + 3O2

c)

2KClO3 → 2KCl + 3O2

59.

Which reaction type is the following:

C5H10 + O2 --> CO2 + H2O

a)

Decomposition

b)

Synthesis

c)

Complete Combustion

d)

Double Replacement

60.
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.

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