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Chemical Reactions

Total questions: 57

Worksheet time: 29mins

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.
an atom or molecule which has gained or lost one or more of its valence electrons
a)
Covalent Bond
b)
Chemical Formula
c)
Ion
d)
Compound
4.
bond in which one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other
a)
Covalent Bond
b)
Ionic Bond
c)
Reaction Bond
d)
Null Bond
5.
bond in which one or more pairs of electrons are shared by two atoms
a)
Covalent Bond
b)
Ionic Bond
c)
Reaction Bond
d)
Null Bond
6.
a substance formed when two or more elements are chemically bonded together
a)
Element Soup
b)
Pure Element
c)
Ion
d)
Compound
7.
tells us the number of atoms of each element in a compound
a)
Coeffecient
b)
Exponent
c)
Chemical Formula
d)
Calculator
8.
a chemical reaction that releases energy by light or heat
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
9.
type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
10.
type of reaction in which two or more elements combine to form a more complex compound
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
11.
type of reaction in which a compound is broken down into its simple elements
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
12.
Chemical properties of a substance include all of the following except..
a)
its boiling point 
b)
its toxicity 
c)
its flammability 
d)
its reactivity 
13.
A metal like copper is said to be ductile. This means it can be ... 
a)
corroded easily
b)
bent into wires 
c)
heat up and conduct heat
d)
bent into sheets 
14.
Some hydrochloric acid is added to marble chips in a test tube. The students observed bubbles and fizzing. The gas is ....
a)
Oxygen gas 
b)
Carbon dioxide 
c)
Hydrogen gas 
d)
nitrogen gas 
15.
In another reaction, the student places a piece of metal into a test tube and adds an acid again. Its fizzes ..
The gas produced is called...
a)
nitrogen 
b)
Oxygen gas
c)
sulphur dioxide 
d)
Hydrogen gas 
16.
The process going from a gas to a liquid is called ...
a)
evaporation 
b)
melting 
c)
condensation 
d)
sublimation 
17.
The only way you can be certain that a chemical reaction has occured is by? 
a)
Light has been emitted 
b)
a colour change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
18.
A Precipitate forms 
a)
when a gas is bubble through a liquid 
b)
a lighter taper causes a gas to burn 
c)
in a liquid or gas  after a reaction and causes cloudiness (caused by a solid forming) 
19.
I heat some copper carbonate in a test tube.
It goes black. This is due to the Copper carbonate reacting to form ...
a)
Copper Oxide
b)
carbon dioxide
c)
lead oxide 
d)
Copper 
20.
The number of atoms of oxygen in 
Cu(NO3)2 is ...
a)
2
b)
5
c)
6
d)
zero 
21.
The correct chemical formula for calcium carbonate is ....
a)
CaCO3
b)
Ca2CO3
c)
Na2CO3
d)
CO2
22.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
23.
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. 
24.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
25.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
26.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
27.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
28.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
29.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
30.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
31.
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!
32.

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO3 → Ag + _____

a)

Cu(NO3)2

b)

CuNO3

c)

CuAg

d)

Cu

33.

Predict the products of this synthesis reaction: H2 + Cl2 →

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

34.

Predict the products for the this Single Replacement reaction:

K + HCl →

a)

KCl + H2

b)

KHCl

c)

KH + Cl2

d)

HCl + K2

35.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

36.

Predict the product of this synthesis reaction:

Al + S₈ →

a)

AlS

b)

AlS8

c)

Al2S

d)

Al2S3

37.

Predict the products for the decomposition of aluminum oxide, Al2O3 →

a)

Al + O2

b)

O + Al2

c)

Al2 + O3

d)

Al + O

38.

What are the products of this reaction:

C2H4 + O2 →

a)

C2O2 + H4

b)

CO2 + H2 + O2

c)

CO + H

d)

CO2 + H2O

39.

Predict the products of this single replacement reaction: Na + H2O →

a)

NaO + H2

b)

NaOH + H2

c)

NaH + O2

d)

ONaH

40.

The name of FeCl₂ is

a)

iron chloride

b)

iron (II) chloride

c)

iron (I) chloride

d)

iron dichloride

41.

Name the ionic compound SnSe2

a)

Tin diselenide

b)

Tin (IV) Selenide

c)

Tin selenide

d)

Tin (II) triselenide

42.

Name the following ionic compound: BeCl2

a)

beryllium chlorine

b)

beryllium II chloride

c)

beryllium chloride

d)

beryllium dichloride

43.

Name the following ionic compound: Cs2S

a)

cesium sulfide

b)

cesium sulfate

c)

cesium II sulfate

d)

cesium II sulfide

44.

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

a)

True

b)

False

45.

In a chemical reaction, atoms (a)   and form new bonds.

46.

Look at the chemical equation.


How many atoms of mercury (Hg) are in the reactants?

(a)  

47.

Look at the chemical equation.


How many atoms of oxygen (O) are in the reactants?

(a)  

48.

Look at the chemical equation.


How many atoms of nitrogen (N) are in the reactants?

(a)  

49.

Look at the chemical equation.


How many atoms of oxygen (O) are in the reactants?

(a)  

50.

Look at the chemical equation.


How many atoms of oxygen (O) are in the products?

(a)  

51.

Look at the chemical equation.


How many atoms of carbon (C) are in the products?

(a)  

52.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
53.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
54.
Which of the following is an example of a physical change?
a)
souring milk
b)
mixing baking soda and vinegar
c)
rusting metal
d)
mixing oil and vinegar
55.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
56.
Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
57.
How do chemical reactions turn substances into new substances?
a)
with burning acid
b)
the molecules mix together and create new substances
c)
the atoms break apart and combine back together in new ways
d)
the ionic compounds mix in water to form solutions

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