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Worksheets9 SCI Chem Revision
Total questions: 66
Worksheet time: 1hrs 14mins
Name
Class
Date
1.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
2.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
3.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
4.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
5.
Which of the following is NOT an example of chemical change?
a)
sour milk
b)
burning wood
c)
breaking a pencil
d)
rust
6.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
7.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
8.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
9.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
10.
What is the formula for magnesium phosphide?
a)
Mg3P2
b)
Mg2P3
c)
Mg2(PO4)3
d)
Mg3(PO4)2
11.
The chemical formula of potassium iodide is
a)
KI
b)
PI
c)
KI₂
d)
K₂I
12.
What is the formula for lithium oxide?
a)
LiO
b)
LiO2
c)
Li2O
d)
Li2O3
13.
What is the formula for calcium chloride
a)
CaCl
b)
CaCl2
c)
Ca2Cl
d)
CaCl3
14.
Potassium and Oxygen form ?
a)
PO
b)
KO
c)
K2O
d)
KO2
15.
Write the correct chemical formula for Ag + and Br -
a)
AgBr
b)
silver bromide
c)
Ag2Br2
d)
gold bromide
16.
The formula of this atom when it becomes an ion would be
a)
N-2
b)
N+3
c)
N-3
d)
N+2
17.
A negatively-charged ion.
a)
atom
b)
cation
c)
anion
d)
electron
18.
Cations are
a)
positive
b)
negative
c)
on the right side of the periodic table.
d)
nonmetals
19.
Na + and S -2
a)
Na2S
b)
NaS2
c)
Na2S2
d)
NaS
20.
K + and N-3
a)
KN
b)
KN3
c)
K3N3
d)
K3N
21.
How many valence electrons does a bromine atom have?
a)
1
b)
2
c)
6
d)
7
22.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
23.
When naming ionic compounds, the cation is always named first and the anion is always named second.
a)
False
b)
True
24.
How do the following two elements bond together?
Al3+ O2-
Al3+ O2-
a)
AlO
b)
Al2O3
c)
Al3O6
d)
Al3O2
25.
What charge does a calcium (Ca) ion have?
a)
+1
b)
+2
c)
+3
d)
+4
26.
A phosphorus atom needs to gain ___ electrons to achieve a full octet.
a)
3
b)
4
c)
6
d)
5
27.
If an element has 3 valence electrons, what charge will likely form on its ion ?
a)
+3
b)
+5
c)
-3
d)
-5
28.
What formula results when Ca+2 and Br- ions bond?
a)
Ca2Br2
b)
CaBr
c)
Ca(br)2
d)
CaBr2
29.
Which is most likely to form a negative ion?
a)
an element from group 17
b)
a metal
c)
an element from group 1
d)
an element with atoms that have eight valence electrons
30.
Which is the charge that results when oxygen becomes an ion?
a)
+3
b)
+2
c)
-2
d)
-3
31.
What is the formula for iron (II) chloride?
a)
FeCl
b)
FeCl2
c)
Fe2Cl
d)
not enough information to be certain
32.
What is the name of NaBr?
a)
Bromide sodide
b)
Sodium bromide
c)
Sodium bromate
d)
Sodium bromite
33.
The compound created from the bond between Lithium and Oxygen would be called...
a)
Lithium oxate
b)
Lithium oxide
c)
Dilithium oxide
d)
Lithium peroxide
34.
The chemical name of Mg₃N₂ is
a)
manganese nitride
b)
magnesium nitride
c)
magnesium (III) nitride
d)
trimagnesium dinitride
35.
The name of Al₂(SO₄)₃ is
a)
aluminum sulfur oxide
b)
aluminum sulfate
c)
aluminum trisulfate
d)
aluminum (III) sulfate
36.
The name of Ca₃(PO₄)₂ is
a)
calcium phosphide oxide
b)
calcium phosphate
c)
tricalcium diphosphate
d)
carbon phosphate
37.
The name of (NH₄)₂S is
a)
ammonia sulfide
b)
ammonium sulfide
c)
ammonium (II) sulfide
d)
ammonium sulfate
38.
The chemical formula of ammonium carbonate is
a)
NH₃CO₃
b)
NHCO
c)
NH₄CO₃
d)
(NH₄)₂CO₃
39.
What is the formula for Magnesium Carbonate?
a)
MgCO3
b)
Mg(CO3)2
c)
Mg2CO6
d)
Mg2CO3
40.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
41.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
42.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 > _Bi2O3
_Bi + _O2 > _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
43.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Based on the Law of Conservation of Matter, matter cannot be created or destroyed.
d)
Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e
44.
Which of the following answers will balance the equation below?
__K + __Br2 --> __KBr
__K + __Br2 --> __KBr
a)
2, 1, 1
b)
2, 3, 2
c)
2, 1, 2
d)
1, 2, 3
45.
Which of the following could indicate a chemical change?
a)
All of the answers could indicate Chemical Change
b)
a color change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
46.
A molecule is smaller than an atom.
a)
True
b)
False
47.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
48.
Identify elements in the following compound: NH3
a)
Sodium, Helium
b)
Sodium, Hydrogen
c)
Nitrogen, Helium
d)
Nitrogen, Hydrogen
49.
Element or Compound?
H2O
H2O
a)
Element
b)
Compound
50.
Element or Compound?
Au
Au
a)
Element
b)
Compound
51.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
52.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
53.
Composed of one kind of atom
a)
Compound
b)
Element
c)
Mixture
d)
Homogeneous Mixture
54.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
60
55.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
56.
What happens when you mix an acid with a base?
a)
it stays an acid
b)
it stays a base
c)
neutralization occurs and forms water and a salt
57.
What is HCl?
a)
Acid
b)
Base
c)
Salt
d)
None of the above
58.
A neutralisation reaction is a reaction between
a)
Acid and a Base
b)
Acid and water
c)
Base and water
d)
None of the above
59.
An acid reacts with metal to produce
a)
Carbon dioxide
b)
Hydrogen gas
c)
Hydrogen gas and water
d)
Salt and hydrogen gas
60.
An acid reacts with a metal carbonate to produce
a)
Salt, water and hydrogen gas
b)
Salt, water and carbon dioxide
c)
Limewater
d)
Salt and water
61.
What type of reaction is the following:
HCl + Zn --> ZnCl2 + H2
HCl + Zn --> ZnCl2 + H2
a)
Neutralisation
b)
Acid and a metal
c)
Acid and a carbonate
d)
Ionic
62.
Complete the following reaction:
Hydrochloric acid + magnesium hydroxide -->
Hydrochloric acid + magnesium hydroxide -->
a)
Magnesium chloride + water
b)
Magnesium + water
c)
Magnesium chloride + hydrogen gas
d)
Magnesium chloride + water + carbon dioxide
63.
BASE + ACID ----> SALT +?
a)
water
b)
oxygen
c)
hydrogen ion
d)
hydroxide ion
64.
Which salt will be produced if magnesium react with hydrochloric acid?
a)
Magnesium oxide
b)
Magnesium sulfate
c)
Magnesium sulfide
d)
Magnesium chloride
65.
What are the characteristics of an acid?
a)
taste bitter, turns litmus paper blue, formula ends in OH
b)
taste sour, turns litmus paper red, formula begins with H
c)
caustic, turns litmus paper blue, meta
66.
All base formulas end in
a)
H
b)
OH
c)
any ending - it doesn't matter
d)
H2O
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