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WorksheetsDa Awesome QWEEZ
Total questions: 25
Worksheet time: 1hrs 15mins
Which of the following reactions had the greatest percent yield?
A. theoretical yield 82.3 g; actual yield 80.7 g
B. theoretical yield 22.7 g; actual yield 20.1 g
C. theoretical yield 58.8 g; actual yield 56.2 g
D. theoretical yield 34.6 g; actual yield 32.5 g
In an experiment, 29.2 g of water is formed when methane is burned in the presence of excess of oxygen. If the theoretical yield of H2O is 32.46g. What is the percentage yield of water, to the nearest tenth of a percent?
89.96%
10.04%
29.30%
99.99%
How many moles of O2 are produced when 4.45 moles of Al2O3 decompose? 2Al2O3 -------- 4Al + 3O2
6.675 mol O2
467.254 mol O2
.10938 mol O2
6.675g O2
4. Some students are invited to a barbecue. The food is cooked with propane burning in excess oxygen to produce heat, as shown in this equation.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) + heat
If 310 g of propane gas are consumed, what volume of CO2 is produced at standard temperature and pressure?
928.15L CO2
928.15
312.938201L CO2
12.01L CO2
The complete combustion of 3moles of propane (C3H8) is represented by the reaction C3H8 + 5O2 ---------- 3CO2 + 4H2O
How many grams of water are produced in this reaction?
216.18g H2O
21.618
187.53g
What volume of water can be produced from the combustion of 3.0 L of methane at STP?
CH4(g) + 2O2(g) CO2(g) + 2H2O(g)
6L
4L
2L
8L
Use the reaction below to determine the volume ratio of propane(C3H8) to carbon dioxide (CO2)
C3H8 + 5O2 ---------- 3CO2 + 4H2O
1:3
3:1
5:3
3:4
Propane reacts with oxygen to form carbon dioxide and water
C3H8(g) + 5O2(g) → 4H2O(g) + 3CO2(g)
As shown in the above equation, at STP what volume of Oxygen(O2) gas will be produced?
112L O2
112g CO2
56L O2
193.98L O2
Natural gas, used for heating homes and in the production of electricity, is a gas mixture that is composed primarily of methane. The equation below describes the combustion of methane.
C H4(g) + 2O2(g) → 2H2O(g) + CO2(g)
What mass of oxygen, to the nearest gram, is needed to combine with 82.0 grams of methane?
327.1g
82g
67.2g
Yes
Given the image and information above, what is the limiting reactant and excess reactant?
Cl2 (limiting) H2 (excess)
H2 (limiting) Cl2 (excess)
Define the limiting reactant?
a. The reactant that is leftover after the reaction is complete
b. The reactant that determines the amount of product formed
Hydrogen and nitrogen react to form ammonia according to the reaction below,
3 H2 + N2 ------- 2 NH3.
What reactant is the limiting reactant If 4.0 moles of H2 and 2.0 mol of N2 are reacted?
(Hint draw model diagram or convert from mole of known (each reactant) to moles of product ; the answer with the least product is the limiting reactant.)
H2 LIMITING
N2 LIMITING
5 moles H2O
NH3 LIMITING
Describe the limiting reagent in the diagram above
A. F is the limiting reagent because it was completely consumed.
B. F is the limiting reagent because it made the least amount of product
C. F is the limiting reagent because it determines the amount of product formed.
D. F is the limiting reagent because it made the maximum possible product.
14 Water is a molecule with slightly positive hydrogen atoms and a slightly negative oxygen atom. The positive hydrogen will be attracted to the ______ end of chlorine ion and the negative oxygen will attracted to the _________ end of sodium ion This unique arrangement gives water its _____________
negative; positive; polarity
positive; negative; polarity
polarity; positive; negative
polarity; negative; positive
Water makes it an excellent solvent because it is ___________________________
Polar
water
drinkable
Solution
What is the molarity of 1500mL solution made from 20 grams of NaCl?
.228 M
22.8 M
2.28 M
15.101 M
How many moles of KBr are found in 4 Liters of 0.2 M solution?
0.08 molKBr
.8 molKBr
8.00 molKBr
What volume of a 4M solution of CaCl2 contains 0.200 moles of CaCl2?
.05 L CaCo2
5.05L CaCl2
83.92
12.12 L CaCl2
Predict which of the following would be expected if dilute solutions of Na2SO4(aq) and Ba(NO3)2(aq) are mixed.( use your formula chart)
A Na2SO4(aq) would precipitate
B Both NaNO3(s) and BaSO4(s) would precipitate.
C BaSO4(s) would precipitate.
D NaNO3(s) would precipitate.
A
b
C
D
A
B
C
D
A
B
C
D
Different amount of KClO3 was added to 100g of water at 40oC Based on the solubility curve which observation is incorrect
A. At 40oC 90g of KClO3 does not dissolve forming a saturated solution
B. At 40oC 120g of KClO3 was dissolved forming a saturated solution
C. At 40oC 5g of KClO3 dissolved forming a unsaturated solution
D. At 40oC 16g of KClO3 dissolved forming a saturated solution
Base on the information on the table, which acid is the weakest?
A. Hydrochloric acid
B. Nitrous acid
C. Phosphoric acid
When Sodium chloride(Salt) is dissolved in water it is a strong electrolyte while sugar dissolved in water is not; explain why?
salt breaks into positive and negative ions .
Sugar doesn’t.
sugar breaks into positive and negative ions .
Salt doesn’t
Yes
No
