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WorksheetsChemistry Unit Review
Total questions: 62
Worksheet time: 37mins
Given the WHMIS label, it is likely that the liquid in the bottle is….
corrosive
flammable
dangerously reactive
an oxidizing agent
An industrial inspector spotted this container outside the delivery door. She informed the delivery people that the container should be handled with care because it contained…
corrosive material
compressed gas
oxidizing liquid
flammable gas
What does the WHMIS symbol stand for?
Oxidizing material
Corrosive material
Harmful/Irritant
Biohazardous material
After reading the labels on the bottles, the mechanic concludes that as the percentage of H2O2 in water decreases, the solution becomes
less flammable
more concentrated
more corrosive
less poisonous
A student was able to dissolve 37g of salt in 100mL of water at 20°C. What physical property did the student determine?
Density
Conductivity
Viscosity
Solubility
When a student mentions the “ability to be shaped into sheets” as a physical property, the student is referring to:
Viscosity
Change in state
Malleability
Conductivity
Concrete is a lumpy substance produced by adding gravel to cement. The gravel and the cement components are easily distinguishable. The combination of cement and gravel is known a:
a solution
an alloy
a mechanical mixture
a pure substance
What type of matter is defined as a substance made up of two or more elements chemically combined?
Colloid
Solution
Compound
Element
Matter that is composed of only one kind of atom is referred to as a/an
solution
homogeneous mixture
heterogeneous mixture
element
A student made a list of substances used in a science experiment. For each of the substances below write:
1 if the substance used is an element 2 if the substance used is a compound. Record your answer as a four digit number.
(a)
An example of a physical change is…
melting ice
burning paper
rusting iron
photosynthesis
Which of these terms can be used to describe the chemical properties of a substance?
1, 2, 5
2, 4
2, 3, 4
3, 4
Isabella watched her mother cracking eggs into a frying pan. She noticed that the transparent liquid surrounding the yolks of the eggs became solid and white when the pan was placed over the burner of the stove. Which of the following statement describes the changes that occur to the egg during frying?
The changes are physical because a change in state occurs and an odour is detected.
The changes are chemical because an odour is detected and heat is released.
The changes are physical because a new colour appears and heat is absorbed.
The changes are chemical because heat is absorbed and a new substance is formed.
The best evidence of a chemical change in this reaction is…
A color change
The formation of a gas
The formation of a solid
The release of heat energy
Which of the following scientists was first responsible for providing the understanding that the inside of the atom contains negative charges?
Dalton
Democritus
Rutherford
Thomson
Ernest Rutherford did considerable work on the atom. He is noted for discovering the…
Nucleus of an atom
Negatively charged electrons
Positively charged protons
Neutral neutrons
Which is the correct chronological order of the atomic theories from most earliest to most recent: (Write your answer as a 5 digit number)
(a)
The basic layout of the Periodic Table has not changed from the time it was first organized. Who is the scientist that was initially responsible for developing the Periodic Table?
John Dalton
Ernest Rutherford
J.J. Thomson
Dmitri Mendeleev
Hydrogen has an atomic number of one, whereas, oxygen has an atomic number of eight. This means that each hydrogen atom has…
1 electron, whereas, each oxygen atom has 15 electrons
1 proton, whereas, each oxygen atom has 8 protons
1 neutron, whereas, each oxygen atom has 9 neutrons
an atomic mass of 1, whereas, each oxygen atom an atomic mass of 8
Protons, electrons, and neutrons are subatomic particles. The difference in charge between these subatomic particles is that protons are i , electrons are ii , and neutrons are iii . The row that completes the statement above is…
i - positively charged; ii: negatively charged; iii: not charged
i - negatively charged; ii: positively charged; iii: not charged
i - positively charged; ii: negatively charged; iii: positively charged
i - positively charged; ii: not charged; iii: negatively charged
Atoms are neutral, in order to become a positive ion the atom must
gain electrons
gain protons
lose electrons
lose protons
The Periodic Table shows that potassium has an atomic number of 19 and an atomic mass of 39. How many protons does a potassium atom have?
1
19
20
39
Use the information in the periodic table to determine the number of neutrons present in the phosphorus atom.
15
16
31
46
All elements placed in the same group in the Periodic Table have:
Similar chemical properties
Eight electrons in the last ring
A similar number of orbital rings
no neutrons
The “Alkali metals” and “Halogens” are, respectively
B and C
E and F
D and G
A and E
What does B represent (running horizontally)?
A group
A period
A family
Alkali Earth metals
A group of elements are gases at room temperature and are very stable and do not react with other substances. What area of the periodic table above would the group of elements with the above properties most likely be found in?
A
C
E
F
Elements on the right side of the “staircase” on the periodic table can be classified as being:
shiny
solid
good conductors
non-ductile
What would be the best property to consider if you had to test each element to determine whether it was a metal or non-metal?
colour
magnetism
conductivity
solubility
The formulas representing ionic compounds are…
A, B and C
B, C and E
B, D and E
A, C and E
Which of these is a property of an ionic compound?
low melting point
poor conductor of electricity
crystal shape
shared electrons
The molecular compound carbon disulfide can be written as:
CS
CS2
CuS
CuS2
Methane gas (also called natural gas) is used as the source of fuel for furnaces in homes. Its chemical formula is CH4. The most accurate molecular representation of methane gas is…
Glucose sugar, a product of plant photosynthesis, is chemically represented as Glucose (C6H12O6) has __ unique elements and a total of __ atoms. The row that completes the statement above is:
3 unique elements and 8 atoms in total
6 unique elements and 12 atoms in total
3 unique elements and 24 atoms in total
6 unique elements and 18 atoms in total
Sodium acetate has the chemical formula NaCH3COO. One molecule of sodium acetate has:
3 unique elements and a total of 8 atoms
4 unique elements and a total of 9 atoms
4 unique elements and a total of 8 atoms
3 unique elements and a total of 9 atoms
Carbon monoxide and carbon dioxide are molecular gases produced in a running car engine. How are their structures different?
carbon dioxide has one more carbon atom
carbon dioxide has one more oxygen atom
carbon dioxide has two more oxygen atoms
carbon dioxide has two more carbon atoms
Which of the following chemical formulas for ionic compounds is incorrectly written?
NaCl
LiO2
BeCl2
AlN
What is the chemical name given to the molecular compound P2O5?
Triphosphorous pentoxide
Phosphorus oxide
Diphosphorous pentoxide
Diphosphorous pentoxygen
What is the name of the compound that has the chemical formula N2O4?
Nitrogen oxide
Dinitrogen tetroxide
Nitrogen tetroxide
Dinitrogen tetroxygen
The chemical formula for aluminum oxide is…
AlO
Al2O3
ALO
Al3O2
According to the table of ionic charges above, the chemical formula for calcium chloride is…
CaCl2
Ca2Cl2
CaCl
Ca2Cl
Carbon dioxide reacts with water to produce carbonic acid. Identify the reactants and products in this reaction:
Reactants: carbon dioxide; Products: water and carbonic acid
Reactants: Carbon dioxide and carbonic acid; Products: water
Reactants: Carbon dioxide and water; Products: carbonic acid
Reactants: carbonic acid; Products: water and carbon dioxide
What has happened to the atoms of the reactants?
They have recombined to form the products
They have changed into new atoms.
They have new names and places.
Some have been lost to the environment.
Which of the following correctly identifies the products in this reaction?
lead chloride, sodium iodide, sodium chloride and lead iodide
lead chloride and sodium iodide
lead and sodium
lead iodide and sodium chloride
The type of change that occurs during this reaction is a:
chemical change
physical change
pH change
exothermic change
The hydrogen that the scientists produce can then be burnt to generate electricity. The burning of hydrogen is…
an exothermic reaction
a neutralization reaction
an endothermic reaction
a corrosion reaction
The formation of frost is an example of an…
endothermic physical change
exothermic physical change
endothermic chemical change
exothermic chemical change
The reaction that occurs between the sodium and water is an example of a…
physical change in which heat energy is absorbed
physical change in which heat energy is released
chemical change in which heat energy is absorbed
chemical change in which heat energy is released
The burning of gasoline fuel is an example of a…
Combustion endothermic reaction
Corrosion endothermic reaction
Corrosion exothermic reaction
Combustion exothermic reaction
The chemical reaction of “iron + water + oxygen → rust” is an example of?
combustion
decomposition
corrosion
neutralization
Which of the following statements best describes photosynthesis and respiration?
Photosynthesis and respiration are exothermic reactions
Photosynthesis is an exothermic reaction and respiration is an endothermic reaction
Photosynthesis and respiration are endothermic reactions
Photosynthesis is an endothermic reaction and respiration is an exothermic reaction
During a chemical reaction, in a closed system, the mass of the reactants...
always equals the mass of the products.
may be greater than the mass of the products.
may be less than the mass of the products.
has nothing to do with the mass of the products.
Based on the Law of Conservation of Mass, predict the minimum amount of magnesium that will react with all 16.0 grams of oxygen to produce 40.3 grams of magnesium oxide
16.0 g
24.3 g
32.0g
56.3 g
If the mass of 191 grams sodium chloride reacted with 74 grams of calcium hydroxide and 80 grams of sodium hydroxide is produced, what mass of calcium chloride is produced?
52.5 grams
91 grams
111 grams
185 grams
A scientist found the mass of two samples of chemical compounds. The scientist placed the two compounds into a beaker and observed the resulting chemical reaction. The scientist then found the mass of the product in the beaker. The final mass was less than the mass of the two original samples. The most likely explanation for the difference in mass is that…
one product of the reaction was a gas that “disappeared” into the air
part of the original mass was converted to heat
the scientist made an error in measurement
the product was hot, resulting in less mass
Which statement about catalysts is true?
They change the rate of chemical reactions.
They are reactants in chemical reactions.
They are used up in chemical reactions.
all of the above
If the temperature of a reaction is decreased, what effect will this have on the reaction time?
The reaction time will decrease.
The reaction time will increase.
It will have no effect.
The reaction will stop.
In terms of factors affecting reaction rate in a chemical reaction, only this is TRUE about concentration. The greater the concentration of the…
reactants the slower the reaction
products the slower the reaction
reactants the faster the reaction
products the faster the reaction
Which of the mixtures above would have the fastest rate of reaction?
L
M
N
O
What is the manipulated variable in this experiment?
temperature of the water
time to complete the reaction
reaction rate
amount of water
Which of the following would be an important controlled variable in this experiment?
temperature of the water
time to complete the reaction
reaction rate
amount of water
According to the data above, how long would it take a tablet at 12°C to react completely?
12 s
18 s
36 s
150 s
