GRADE 12 PHYSICAL SCIENCES: CHEMISTRY ASSESSMENT [120]
FRIDAY, 8 MARCH 2019
Section A [40]
1. What is the value of Avogadro’s number? (1)
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2. What is the volume occupied by a gas at STP? (1)
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3. What does the acronym STP stand for? (1)
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4. State the symbols for the four states of matter. (1)
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5. Define the term “molar mass”. (1)
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6. What are the units of molar mass? (1)
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7. Answer the following questions below with reference to the chemical equation below.
CuCO3 (s) +2HNO3 (aq) → Cu(NO3)2 (aq) + CO2 (g) + H2O (l)
a. How many moles are present in 65g of copper carbonate supplied? (3)
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, b. What is the concentration of the nitric acid used if you dissolved 200g in 0.8dm3?
(6)
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c. Thus, what volume of nitric acid do you need to fully react with the 63g of copper
carbonate? (4)
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d. Thus, what volume of carbon dioxide gas was released when all the copper
carbonate reacted? (3)
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e. What physical observation would indicate that the reaction has reached
completion? (1)
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Page 2 of 11
FRIDAY, 8 MARCH 2019
Section A [40]
1. What is the value of Avogadro’s number? (1)
______________________________________________________________________
2. What is the volume occupied by a gas at STP? (1)
______________________________________________________________________
3. What does the acronym STP stand for? (1)
______________________________________________________________________
4. State the symbols for the four states of matter. (1)
______________________________________________________________________
5. Define the term “molar mass”. (1)
______________________________________________________________________
6. What are the units of molar mass? (1)
______________________________________________________________________
7. Answer the following questions below with reference to the chemical equation below.
CuCO3 (s) +2HNO3 (aq) → Cu(NO3)2 (aq) + CO2 (g) + H2O (l)
a. How many moles are present in 65g of copper carbonate supplied? (3)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
Page 1 of 11
, b. What is the concentration of the nitric acid used if you dissolved 200g in 0.8dm3?
(6)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
c. Thus, what volume of nitric acid do you need to fully react with the 63g of copper
carbonate? (4)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
d. Thus, what volume of carbon dioxide gas was released when all the copper
carbonate reacted? (3)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
e. What physical observation would indicate that the reaction has reached
completion? (1)
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
Page 2 of 11
