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Alhussan Chemistry — Stage 9

Chapter 10: Structure, Bonding, and Properties

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Chapter 12: Chemical Reactions 3 and Rates

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Quiz

Chemistry 12.2 Writing symbol equations — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Which is a diatomic element?
He
Fe
Cl₂
Na
2.
Mass of water from hydrogen. At what value of "Hydrogen (g)" is "Water (g)" greatest?
Dr Dabour Hub Academy - figure 1
8
6
2
4
3.
True or false? 2Mg + O2 → MgO.
True
False
4.
True or false? (aq) means a gas.
True
False
5.
How many hydrogen atoms in 3H2O?
3
9
5
6
6.
True or false? CH4 + 2O2 → CO2 + 2H2O.
True
False
7.
CaCO3 → CaO + ____.
O2
C
CO
CO2
8.
4 g hydrogen makes 36 g water. Water from 2 g hydrogen?
18 g
72 g
180 g
34 g
9.
How many hydrogen atoms in 5H2O?
10
5
15
7
10.
Students balancing equations correctly (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
11.
True or false? Oxygen gas is O2.
True
False
12.
Mass of water from hydrogen. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
13.
16 of 32 students balanced CH4 combustion. Percentage?
50%
16%
500%
5%
14.
Students balancing equations correctly (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 4
A
B
C
D
15.
How many hydrogen atoms in 2H2O?
6
40
2
4
16.
2MgO contains ____ magnesium atoms.
4
0
2
1
17.
4 g hydrogen makes 36 g water. Water from 6 g hydrogen?
54 g
540 g
38 g
216 g
18.
What is the balanced equation for magnesium burning?
Mg + O₂ → MgO
2Mg + O₂ → 2MgO
2Mg + 2O₂ → 2MgO
Mg + O → MgO₂
19.
True or false? Chlorine gas is Cl2.
True
False
20.
Atoms on each side of 2H2 + O2 → 2H2O. Which has the smallest value?
Dr Dabour Hub Academy - figure 5
O (right)
H (left)
O (left)
H (right)
21.
Which is the correct definition of “Coefficient”?
Big number in front of a formula.
Using electricity to split compounds.
Green compound in malachite.
Salt from magnesium and hydrochloric acid.
22.
2Mg + O2 → ____.
MgO2
2MgO
Mg2O
MgO
23.
True or false? Guessing formulae is fine.
True
False
24.
True or false? Hydrogen gas is H.
True
False
25.
16 of 30 students balanced CH4 combustion. Percentage?
14%
533%
53%
47%
26.
Mass of water from hydrogen. What is the value of "Water (g)" when "Hydrogen (g)" is 4?
Dr Dabour Hub Academy - figure 6
36
72
18
54
27.
Coefficients needed in equations. What is the total of all the values?
Dr Dabour Hub Academy - figure 7
11
13
4
15
28.
Students balancing equations correctly (%). About how many times bigger is H2O than CH4 combustion?
Dr Dabour Hub Academy - figure 8
3.9
1.0
2.9
1.9
29.
Which statement is NOT correct?
(s) means solid.
Zn + H2SO4 → ZnSO4 + H2.
2H2 + O2 → H2O is balanced.
CH4 + 2O2 → CO2 + 2H2O.
30.
Which statement is correct?
N2 + H2 → NH3 is balanced.
CaCO3 → CaO + CO.
(aq) means a gas.
CaCO3 → CaO + CO2.
31.
Which statement is NOT correct?
N2 + 3H2 → 2NH3.
2H2 + O2 → 2H2O.
Hydrogen gas is H.
Chlorine gas is Cl2.
32.
How many atoms in total in 4H2SO4?
11
16
28
4
33.
Students balancing equations correctly (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
34.
Coefficients needed in equations. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
35.
How many oxygen atoms in 4CO2?
4
12
8
6
36.
Coefficients needed in equations. About how many times bigger is Ammonia than Water?
Dr Dabour Hub Academy - figure 11
1.5
0.8
2.2
3.0
37.
True or false? A symbol equation shows reactants, products and their formulae.
True
False
38.
True or false? (g) means gas.
True
False
39.
Atoms on each side of 2H2 + O2 → 2H2O. What is the total of all the values?
Dr Dabour Hub Academy - figure 12
12
10
14
4
40.
True or false? CaCO3 → CaO + CO.
True
False
41.
Which is the correct definition of “Diatomic element”?
Breaking down by heat.
H2, N2, O2, F2, Cl2, Br2, I2.
Reactant in thermite.
Heating an oxide with carbon to remove oxygen.
42.
Chlorine gas is ____.
Cl3
Cl
Cl2
CL
43.
Which statement is correct?
You balance by changing subscripts.
2H2 + O2 → H2O is balanced.
N2 + H2 → NH3 is balanced.
2Na + Cl2 → 2NaCl.
44.
Mass of water from hydrogen. What is the value of "Water (g)" when "Hydrogen (g)" is 4?
Dr Dabour Hub Academy - figure 13
17
33
69
51
45.
Mg + 2HCl → MgCl2 + ____.
2H
Cl2
H2
H
46.
Hydrogen gas is ____.
2H
H3
H
H2
47.
In 2H₂ + O₂ → 2H₂O, how many hydrogen atoms are on the right?
4
6
8
2
48.
Which statement is NOT correct?
(g) means gas.
Mg + 2HCl → MgCl2 + H2.
CaCO3 → CaO + CO.
N2 + 3H2 → 2NH3.
49.
What does (aq) mean?
Dissolved in water
Gas
Solid
Liquid
50.
Students balancing equations correctly (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 14
A
B
C
D
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Part of Chapter 12: Chemical Reactions 3 and Rates — see every lesson and quiz in this unit.
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