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AQA GCSE Chemistry (9-1): Chemical quantities and calculations Flashcards | StudBud
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AQA GCSE Chemistry (9-1): Chemical quantities and calculations
AQA GCSE Chemistry (9-1): Chemical quantities and calculations
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#GCSE #Chemistry #Quantitative #9-1 You will need: Periodic table Paper Pencil/pen Calculator
Flashcards
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Questions
35
Answers
1
What is the mass of
3 moles
of water?
30 g
54 g
18 g
54 mg
2
Which of these best describes accuracy?
How close measurements are to each other
How close a measurement is to a true value.
How much of a pattern results show.
3
For some results: range =
0.60 cm.
mean =
75 mm.
What is the percentage uncertainty?
8%
80%
0.8%
8cm
4
A higher atom economy means a reaction is....
more sustainable
more economical
Faster
Safer
5
A reaction produces
48 g
of CuO.
80 g
was expected. What was the percentage yield?
60 %
70 %
65 %
65 %
6
R + 5O
2
→ 3CO
2
+ 4H
2
O. What is R?
C2H6
C3H9
C3H8
CH4
7
How many oxygen atoms are there in CuCO
3
?
4
2
3
1
8
C
7
H
16
+ 11O
2
→ 7CO
2
+ 8H
2
O. What mass of CO
2
is formed from burning
100 g
of
C
7
H
16
?
207 g
308 g
307 g
208 g
9
Concentration calculation is...
moles ÷ volume
mass ÷ volume
volume ÷ mass
mass ÷ moles
10
6.02 × 10
23
is known as?
Michelangelo's constant
Leonardo's constant
Avagadro's constant
Donatello's constant
11
The calculation for number of moles is...
moles = relative formula mass ÷ mass
moles = mass ÷ relative formula mass
moles = concentration (mol/dm3) × volume (dm3)
moles = mass × relative formula mass
12
What is the formula mass (
M
r
) of carbon dioxide (CO
2
)?
36
38
42
44
13
C
3
H
8
+ 5O
2
→ 3CO
2
+ 4H
2
O. How many moles of
H
2
O
will be made from
6 moles
of
C
3
H
8
?
12
4
30
24
14
The relative atomic mass tells you the number of ?
Protons + Electrons
Neutrons + Electrons
Protons + Neutrons
Protons
15
Unit for concentration is
g/dm3
mol/dm3
moldm3
g/mol
16
What is the relative atomic mass (
A
r
) of Argon?
40
22
10
18
17
2 moles
of
Fe
has a mass of ?
54 g
26 g
56 g
112 g
18
How many moles of Carbon dioxide would have a mass of 220g ?
5
4
3
2
19
How is percentage yield calculated?
(actual yield ÷ predicted yield) × 100
(actual yield + predicted yield) × 100
(actual yield × predicted yield) × 100
(actual yield - predicted yield) × 100
20
The unit for molar mass is?
mol/dm3
gmol-1
mol/g
g/mol
21
Which of these apparatus is the most accurate in measuring volumes.
Glass pipette
Mass balance
Spatula
Measuring cylinder
22
How many sodium atoms are there in Na
2
O ?
4
3
2
1
23
How is range calculated from a set of results?
Highest value - lowest value
Lowest value - Highest value
(Highest value - lowest value) x 100
Highest value - the mean
24
One mole is what number of things?
3.01 × 1023
6.02 × 1023
6.02 × 1032
6.02 × 10230
25
What is the relative atomic mass (
A
r
) of magnesium?
24
36
12
6
26
What is the formula mass (
M
r
) of water (H
2
O)?
10
18
32
16
27
What is meant by the law of conservation of mass?
atoms are not lost or made during a chemical reaction
atoms are created during a chemical reaction
atoms are lost during a chemical reaction
28
1 mole of
Ne
has a molar mass of ?
20 mols
10 g/mol
20 g/mol
40 g/mol
29
How many carbon atoms are there in Zinc carbonate?
4
2
1
3
30
How is percentage uncertainty of a set of measurements calculated?
(Range ÷ mean) × 1000
(Range ÷ mean) × 100
(Range ÷ mean)2 × 100
(Range ÷ mean) ÷ 100
31
CuCO
3
→ CuO + CO
2
. What mass of
CuCO
3
is needed to produce
7.95 g
of CuO?
13.35 g
14.35 g
12.35 g
15.35 g
32
How do you convert from cm
3
to dm
3
× 1000
÷ 100
× 100
÷ 1000
33
How many magnesium atoms are there in Mg(OH)
2
?
4
1
2
3
34
What is the formula mass (
M
r
) of O
2
?
8
32
16
24
35
A measuring cylinder has an uncertainty of
±0.5 cm
3
. What is the true measurement for
15.5 cm
3
?
Between 13.5 cm3 and 16.5 cm3
Between 14.6 cm3 and 15.6 cm3
Between 15.0 cm3 and 16.0 cm3
Between 15.5 cm3 and 16.5 cm3
