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WorksheetsGrade 9 End of year Chemistry review
Total questions: 60
Worksheet time: 1hrs 13mins
Name
Class
Date
1.
Which of the following is not an example of a chemical reaction
a)
burning of wood
b)
freezing of water
c)
rotting of fruit
d)
explosion of dynamite
2.
What two products are usually produced from a combustion reaction?
a)
a chemical salt and hydrogen gas
b)
oxygen gas and a cloudy liquid
c)
water vapour and carbon dioxide gas
d)
carbon dioxide and smoke
3.
What is not an indication of a chemical change?
a)
smell produced
b)
heat produced
c)
solid produced
d)
melting
4.
Name the elements in
NaHCO3
NaHCO3
a)
sodium, hydrogen, carbon, oxygen
b)
sulfur, hydrogen, cobolt
c)
sodium, hydrogen, cobolt
d)
sulfur, hydrogen, carbon trioxide
5.
The chemical formula for sulfuric acid is H2SO4
How many atoms are present?
How many atoms are present?
a)
3
b)
6
c)
7
d)
10
6.
The mass of an atoms nucleus is the sum of
a)
protons + neutrons
b)
electrons + neutrons
c)
electrons + protons
7.
Methane burning in oxygen is an example of
a)
photosynthesis
b)
combustion
c)
decomposition
d)
neutralisation
8.
The amount of reactants should equal the amount of products. This is the rule for
a)
chemical reactions
b)
acid base reactions
c)
conservation of mass
d)
neutralisation reactions
9.
Exothermic reactions
a)
happen on the outside
b)
take in heat
c)
give off heat
d)
happen on the inside
10.
Which of the following is an example of an element?
a)
Water
b)
Carbon
c)
Oil
d)
Carbon Dioxide
11.
When the number of electrons and protons is the same, the atom will:
a)
Have no charge
b)
A positive charge
c)
Explode
d)
A negative charge
12.
What is the chemical name of NO2?
a)
Nitrogen dioxide
b)
Dinitrogen dioxide
c)
Dinitrogen oxide
d)
Dioxide nitrogen
13.
An example of sublimation is:
a)
When ice is formed
b)
When dew forms on grass
c)
When frost forms on your windshield
d)
When water is lifted from the puddles into the clouds
14.
A pure substance that cannot be changed into simpler substances; found on the periodic table
a)
Mixture
b)
Compound
c)
Element
d)
Valence
15.
A pure substance made of two or more types of elements that are chemically combined
a)
Compound
b)
Matter
c)
Mixture
d)
Molecule
16.
A type of mixture in which the substances are visibly distinguished (example: trail mix)
a)
Homogeneous Mixture
b)
Heterogeneous Mixture
c)
Multi-level Mixture
d)
Reversible Mixture
17.
Can be observed or measured without changing the composition of the matter of the substance; includes appearance, texture, color, odor, and others.
a)
Neutral Properties
b)
Positive Properties
c)
Chemical Properties
d)
Physical Properties
18.
The property of metals that allow them to be hammered into flat sheets
a)
Density
b)
Malleability
c)
Ductility
d)
Instability
19.
The property of metals that allow them to be drawn into a wire
a)
Density
b)
Malleability
c)
Ductility
d)
Instability
20.
An element with same number of protons, but a different number of neutrons
a)
Monotope
b)
Isotope
c)
Hypertope
d)
Octatope
21.
The numbers to the lower right of the chemical symbols in a formula
a)
Coefficient
b)
Subscript
c)
Exponent
d)
Variable
22.
Indicates the number of molecules (or atoms) involved in the reaction. Written in front of element symbol within a chemical formula
a)
Subscript
b)
Exponent
c)
Variable
d)
Coefficient
23.
Which of these recorded observations is qualitative, rather than quantitative?
a)
A chemical reaction is complete in 2.3 s.
b)
The solid has a mass of 23.4 g.
c)
The compound melts at 87.5°C.
d)
Iron is denser than aluminum.
24.
The unit cm3 is used to express
a)
length.
b)
mass.
c)
volume.
d)
time.
25.
The measurement 0.0265 g, rounded off to two significant figures, would be
a)
0.026 g.
b)
0.027 g.
c)
0.03 g.
d)
0.030 g.
26.
In division and multiplication, the answer should have the same number of significant figures as the
a)
number in the calculation with the fewest significant figures.
b)
number in the calculation with the most significant figures.
c)
average number of significant figures in the calculation.
d)
total number of significant figures in the calculation.
27.
An element with a mass number of 11 and an atomic number of 5 has how many neutrons?
a)
11
b)
5
c)
6
d)
16
28.
What is the element name of the atom pictured?
a)
Fluorine
b)
Neon
c)
Argon
d)
Potassium
29.
What is the molar mass of C6H12O6?
a)
180.18
b)
180.12
c)
180.24
d)
180.06
30.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
31.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
32.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
33.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
34.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
35.
In the equation 6 CO2 + 6 H2O → C6H12O6 + 6 O2, the mole ratio of water to oxygen is:
a)
6:6
b)
1:6
c)
6:1
36.
Calculate the molar mass of Mg(OH)2.
a)
33.2 g/mol
b)
41.3 g/mol
c)
86.9 g/mol
d)
58.3 g/mol
37.
The properties of an element can be predicted from...
a)
color
b)
location on Periodic Table
c)
educated guess
d)
atomic number
38.
What section is the least reactive?
a)
yellow
b)
red
c)
dark blue
d)
orange
39.
Anions are _______ that form ____________ ions and __________ electrons.
a)
nonmetals, positive, lose
b)
nonmetals, negative, gain
c)
metals, positive, gain
d)
metals, positive, lose
40.
What is the charge does a sodium ion have?
a)
+2
b)
+1
c)
-1
d)
-2
41.
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
42.
Which of the following will have a larger radius than Zinc?
a)
Gallium
b)
Aluminum
c)
Magnesium
d)
Strontium
43.
As atoms of elements in group 16 are considered in order from top to bottom, the electronegativity of each successive element....
a)
decreases
b)
increases
c)
remains the same
d)
none of the above
44.
Ionization energy is...
a)
the energy required to add an electron to a specific atom
b)
how much energy it takes to remove an electron from an atom
c)
the energy required to shield the outer electrons from the nucleus
d)
a measure of the ability of an atom to attract electrons
45.
Which statement correctly and completely identifies a trend?
a)
Atomic radius decreases across a period and increases down a group.
b)
Electronegativity decreases across a period and decreases down a group.
c)
Ionization energy increases across a period and increases down a group.
d)
Ionic radius increases across a period and increases down a group.
46.
A gas, X, is less dense than air and insoluble in water. Which method cannot be used to collect the gas?
a)
A
b)
B
c)
C
d)
D
47.
The graph below shows the cooling curve for a substance. Which of the following gives the correct states for a substance at P, Q and S?
a)
P: Solid,
Q: Liquid
S: Gas
Q: Liquid
S: Gas
b)
P: Gas,
Q: Liquid
S: Solid
Q: Liquid
S: Solid
c)
P: Liquid,
Q: Gas and Liquid
S: Solid
Q: Gas and Liquid
S: Solid
d)
P: Gas,
Q: Gas and Liquid
S: Liquid
Q: Gas and Liquid
S: Liquid
48.
Methanol boils at 65oC and water boils at 100oC. Methanol and water are completely miscible with each other. Which method is used to separate a mixture of these two liquids?
a)
evaporation
b)
filtration
c)
fractional distillation
d)
paper chromatography
49.
The table below shows the boiling points of four substances. Which substance shows the strongest attractive forces between particles at room temperature and pressure?
a)
A
b)
B
c)
C
d)
D
50.
Substance R melts at 30°C and boils at 70°C. It is highly soluble in water, and can be purified by simple distillation as shown in the diagram. At which point, A, B, C or D in the diagram below, will the particles of R be closely packed in a neat and orderly arrangement?
a)
A
b)
B
c)
C
d)
D
51.
In this heating curve, at which point does both liquid and gas exist together?
a)
A
b)
B
c)
C
d)
D
52.
A student wishes to add exactly 13.2 cm3 of acid to exactly 25.0 cm3 of an alkali as part of an experiment. Which apparatus should the student use to measure these volumes?
a)
A
b)
B
c)
C
d)
D
53.
The solubilities of three solids in two solvents are given in the table. What method would be suitable for obtaining pure sand from a mixture of sand, sodium chloride and sulfur?
a)
Add methylbenzene and stir; then filter.
b)
Add methylbenzene and stir; then filter, then add the residue to water and stir; and then filter this mixture.
c)
Add water and stir; then filter; then evaporate the filtrate to dryness
d)
Add water and stir; then filter; then add methylbenzene to the filtrate and stir; then evaporate the solvent.
54.
Which of the following exist as diatomic molecules at room temperature?
a)
hydrogen, hydrogen chloride, helium
b)
nitrogen, chlorine, sulfur
c)
nitrogen, oxygen, fluorine
d)
oxygen, carbon dioxide, water
55.
Which statement about the molecules in ice is correct?
a)
The molecules are diatomic.
b)
The molecules move randomly.
c)
The molecules move with the same speed.
d)
The molecules vibrate about its fixed position.
56.
Sodium melts at 98oC and boils at 890oC. Which diagram best shows the arrangement of sodium atoms at 100oC?
a)
A
b)
B
c)
C
d)
D
57.
Which of these mixture types would have visible particles that could settle to the bottom of the mixture?
a)
suspension
b)
solution
c)
colloid
d)
sassafrass
58.
The diagram shows the apparatus for separating soil and water. What are the labelled parts?
a)
A = distillate, B = filtrate
b)
A = filtrate, B = residue
c)
A = residue, B = filtrate
d)
A = residue, B = distillate
59.
Water and alcohol are easily separated by distillation because of their
a)
different densities
b)
different boiling points
c)
different colours
d)
different melting points
60.
Doctors need to detect the presence of amino acids in the urine when diagnosing illnesses. Which of the following experimental techniques is suitable for detecting amino acids in urine?
a)
Chromatography
b)
Crystallisation
c)
Distillation
d)
Filtration
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