WorksheetsChemistry Unit Review
Total questions: 75
Worksheet time: 54mins
Name
Class
Date
1.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
2.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
3.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
4.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
5.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
6.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
7.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
8.
Kim puts an ice cube in a beaker and it melts. This is a good example of:
a)
a physical change.
b)
a chemical change.
c)
an experiment.
d)
an analysis.
9.
Adding baking soda and vinegar together and it fizzes and creates carbon dioxide.
a)
Chemical
b)
Physical
10.
Which is a Chemical property?
a)
Thermal Conductivity
b)
Density
c)
Malleability
d)
Flammability
11.
Dissolving sugar in water is an example of a
a)
physical change
b)
chemical change
12.
Rusting piece of metal is an example of a chemical change.
a)
true
b)
false
13.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
14.
KMnO4
How many atoms of oxygen are in this molecule?
How many atoms of oxygen are in this molecule?
a)
1
b)
2
c)
4
d)
6
15.
KMnO4
How many atoms of manganese (Mn) are in this compound?
How many atoms of manganese (Mn) are in this compound?
a)
1
b)
2
c)
5
d)
6
16.
KMnO4
How many atoms of potassium (K) are in this compound?
How many atoms of potassium (K) are in this compound?
a)
1
b)
2
c)
6
d)
8
17.
KMnO4
How many total atoms are in this compound?
How many total atoms are in this compound?
a)
1
b)
3
c)
6
d)
8
18.
What is an element?
a)
Fire, water, earth, air
b)
A type of car
c)
A molecule
d)
The simplest pure substance
19.
What is a proton?
a)
A positively charged particle in the nucleus of an atom.
b)
A negatively charged particle
c)
A neutrally charged particle in the nucleus of an atom.
d)
A professional ton
20.
What is a neutron?
a)
A positively charged particle in the nucleus of an atom.
b)
A negatively charged particle
c)
A neutrally charged particle in the nucleus of an atom.
d)
A professional ton
21.
What is an electron?
a)
A positively charged particle in the nucleus of an atom.
b)
A negatively charged particle
c)
A neutrally charged particle in the nucleus of an atom.
d)
A professional ton
22.
What is the nucleus of an atom?
a)
The atom's brain
b)
The electrons of an atom
c)
The center of an atom, composed of protons and neutrons
d)
Composed of nucleons
23.
What determines an element's atomic number?
a)
The number of protons
b)
The number of neutrons
c)
The mass
d)
The number of molecules
24.
What determines an element's atomic mass?
a)
The total number of electrons
b)
The total number of protons and electrons
c)
The total number of protons and neutrons
d)
The total number of protons
25.
A molecule is
a)
two or more atoms bonded together
b)
one type of atom
c)
smaller than an atom
d)
an element
26.
Name this compound: H2O
a)
Water
b)
Carbon dioxide
c)
Hydrogen peroxide
d)
Sulfuric acid
27.
What is an atom?
a)
A molecule
b)
The smallest unit of matter
c)
Elements bonded together
d)
Water
28.
What is the symbol for Bromine?
a)
B
b)
Br
c)
79.904
d)
35
29.
How many electrons does Bromine have?
a)
16
b)
79.904
c)
44.904
d)
35
30.
How many electrons does nickel have?
a)
58.71
b)
28
c)
30.71
d)
18
31.
How many neutrons does nickel have?
a)
28
b)
58.71
c)
30
d)
30.71
32.
What is the atomic weight of boron?
a)
B
b)
5
c)
10.81
d)
5.81
33.
How many neutrons does boron have?
a)
5.81
b)
5
c)
10.81
d)
7.81
34.
How many protons does boron have?
a)
10.81
b)
5
c)
5.81
d)
7
35.
Which color are the protons and neutrons in this picture?
a)
Orange and Yellow
b)
Orange and Blue
c)
Yellow and Blue
d)
Just Orange
36.
What is the atomic weight of carbon?
a)
12.011
b)
C
c)
6
d)
6.011
37.
Which color are the electrons in this picture?
a)
Orange
b)
Yellow
c)
Blue
38.
What is the atomic number of carbon?
a)
12.011
b)
6.011
c)
C
d)
6
39.
How many electrons does carbon have?
a)
12.011
b)
6.011
c)
12
d)
6
40.
How many neutrons does carbon have?
a)
12.011
b)
6
c)
6.011
d)
12
41.
How many protons does Bromine have?
a)
35
b)
79.904
c)
44.904
d)
15
42.
Water compound
a)
NaCl
b)
H2O
c)
Protein
d)
CaCO
43.
What is the symbol for Calcium
a)
Cl
b)
Ca
c)
Cm
d)
ca
44.
How many elements are in HHe
a)
3
b)
4
c)
2
d)
5
45.
How many elements are in ULaV
a)
3
b)
4
c)
2
d)
5
46.
What does the element AI stand for ?
a)
Gold
b)
Actinium
c)
Iron
d)
Aluminum
47.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
48.
which one can be found on the periodic table
a)
Compound
b)
Element
49.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
50.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
51.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol
52.
A combination of substances that are not chemically combined is called a(n)____________.
a)
mixture
b)
compound
c)
physical
53.
Mixtures are separated through ___________changes.
a)
mixture
b)
compound
c)
physical
54.
What is H2SO4
made up of?
made up of?
a)
2 hydrogen, 1 sulfur, 4 oxygen
b)
1 hydrogen, 2 sulfur, 4 oxygen
c)
2 hydrogen & 4 sodium
d)
1 hydrogen & 6 sodium
55.
The blue numbers in the image below are called ___________.
a)
compounds
b)
coefficients
c)
subscripts
d)
chemical formulas
56.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
57.
The horizontal rows on the periodic table are known as
a)
periods.
b)
atoms.
c)
groups or families.
d)
valence electrons.
58.
Vertical columns in the periodic table are called _________ of elements and have similar properties.
a)
groups
b)
periods
59.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
60.
In this image, what are the symbols in red are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
61.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
62.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
63.
This appears on the left side of a chemical formula, and represents how many molecules there are.... What is highlighted in yellow?
a)
Atom
b)
Subscript
c)
Molecule
d)
Coefficient
64.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
65.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
66.
Balance this equation...
H2 + Cl2 --> HCl
H2 + Cl2 --> HCl
a)
It is balanced
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
67.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
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.
68.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
69.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
70.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
71.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
72.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
73.
What are the REACTANTS :
H2O + CO2 → HCO + HO
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
74.
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
75.
How many H atoms are in the following equation?
CO2 + 2H2O
CO2 + 2H2O
a)
1
b)
4
c)
2
d)
0
100 %
