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WorksheetsChemistry 9
Total questions: 28
Worksheet time: 1hrs 4mins
In which substance does sulfur have a negative oxidation number?
S
Na2S
CaSO4
SO2
Given the electrochemical cell reaction:
Zn(s) + Ni2+ (aq) → Zn2+ (aq) + Ni(s)
Which species is the reducing agent?
Ni2+
Zn
Zn2
Ni
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
Which half-reaction correctly represents reduction?
S2– → S + 2e–
Mn7+ + 3e– → Mn4+
Mn7+ → Mn4+ + 3e–
S2– + 2e– → S
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
Reduced
Synthesized
None of the above
Oxidized
In the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?
Zinc
Oxygen
Hydrogen
None
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
Iron
Fluorine
Oxygen
None
If in a reaction, copper is reduced; its number of electrons has:
Increased
Remained Constant
Decreased
Varies Randomly
What element is being Oxidized?
N
O
H
S
Pollution _________________________.
is harmful materials put into the environment
found in air, water, and land
effects plants, animals, and people
All of the above
Smog is an example of ______________ pollution.
land
water
air
noise
How does air pollution effect people?
It can cause people to have difficulty breathing.
It can make sick people even sicker.
All of the above
Sometimes, air pollution can cause cancer.
'Have you ever eaten sherbet sweets? They fizz in your mouth and your tongue feels cold. Why do you think that is?'
It is an exothermic reaction
It is an endothermic reaction
It is made of ice
It is dissolving your mouth
Which of the following is a sign that a chemical reaction has occurred?
change in shape
melting
bubbles of gas appear
dissolving
Which statement is correct?
H2SO3 is reducing agent because it undergoes reduction.
Sn4+ is oxidizing agent because it undergoes oxidation
Sn4+ is reducing agent because it undergoes oxidation
H2SO3 is reducing agent because it undergoes oxidation.
For the balanced equation shown below
4Fe + 3O2 --> 2Fe2O3
What is the mass of O2
96g
16g
32g
22g
Given the equation:
2NaClO3 (s) → 2NaCl (s) + 3O2 (g)
2.00 moles of NaClO3 will produce how many grams of O2? (mass of O2 = 32g/mol)
56 g of O2
96 g of O2
64 g O2
32 g O2
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
5.27 g
2.6 g
45 g
690 g
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
290 g
0.85 g
870 g
450 g
If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? ( Limiting )
13.04 g
130.4 g
10.34 moles
13.04 moles
How many grams of ammonia (NH3) can be produced from the reaction of 28 g of nitrogen gas and 25 grams of hydrogen gas?
43 grams
34 grams
25 grams
34 moles
What is a limiting reactant?
the reactant that determines how much product can be made
the reactant that is in excess
the product that you can make the most of
the amount of reactants that react with each other
2Fe2O3 + C → Fe + 3CO2
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2? (Hint: calculate theoretical yield of CO2 first)
15.8%
29.2%
35%
15.5%
CH4 + 2O2 → CO2 + 2H2O
24 grams of CH4 was added to the above reaction. Calculate the theoretical yield of CO2.
66 grams
132 grams
8.72
8.72
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4%
104%
1.04%
96.15%
How can trash effect wildlife?
Wildlife animals cannot hunt prey because of the smell of garbage.
Wildlife could eat trash that they think is food.
Trash makes it hard for wildlife to camouflage.
Wildlife animals are afraid of trash.
What are the main sources of water pollution?
Plastic, Paper, and Metal
Snails in water
Help, there is a boot with a snake inside of it that somehow in the nearby lake.
Agriculture, Industry, and Community
Which of the following is not a natural cause of water pollution?
Volcanoes
Oil spills
Animal waste
Silt from storms and floods
