WorksheetsJCCO Review
Total questions: 25
Worksheet time: 13mins
What is the coefficient of O₂ when the following equation is balanced? __ C₃H₈ + __ O₂ → __ CO₂ + __ H₂O
3
4
5
10
What mass of CO₂ is produced when 8.0 g of methane burns completely? CH₄ + 2O₂ → CO₂ + 2H₂O (Mr: CH₄ = 16, CO₂ = 44)
11 g
22 g
44 g
88 g
Aluminum reacts with chlorine to form AlCl₃: 2Al + 3Cl₂ → 2AlCl₃ If 6.75 g of Al reacts, how many moles of AlCl₃ form? (Mr Al = 27)
0.125 mol
0.250 mol
0.375 mol
0.500 mol
Ammonia (NH₃) is produced by the reaction: N₂ + 3H₂ → 2NH₃ If 4.0 mol H₂ reacts with excess N₂, what mass of NH₃ is produced? (Mr NH₃ = 17)
22.7 g
34 g
45.3 g
68 g
Which compound has the highest percentage by mass of oxygen?
H₂O
CO₂
NaOH
C₂H₆O
A sample contains 3.01 × 10²³ molecules of CO₂. What is the mass of the sample? (Mr CO₂ = 44; Avogadro = 6.02 × 10²³)
22 g
44 g
88 g
132 g
How many moles of atoms are in 5.0 g of CH₄?
0.31 mol
1.56 mol
0.625 mol
2.50 mol
What mass of KCl (Mr = 74.5) is needed to prepare 250 mL of 0.500 mol/L solution?
9.3 g
18.6 g
37.3 g
74.5 g
A solution has pH = 2.7. What is the approximate hydrogen ion concentration?
5×10⁻³ M
2×10⁻² M
1×10⁻³ M
2×10⁻¹ M
Which solution has the highest OH⁻ concentration?
pH = 2
pH = 5
pH = 9
pH = 12
What is the pH of a 0.001 M strong acid?
1
2
3
4
A gas occupies 600 mL at 27°C. At what temperature (in K) will its volume double, assuming constant pressure?
327 K
354 K
600 K
894 K
A gas sample has P = 2.0 atm, V = 3.0 L, T = 300 K. How many moles are present? (R = 0.082)
0.12 mol
0.24 mol
0.30 mol
0.60 mol
A sealed container has pressure P₁ = 1.2 atm at 20°C. What is the pressure at 80°C, if V is constant?
1.4 atm
1.6 atm
1.8 atm
2.0 atm
The enthalpy change for a reaction is –150 kJ. Which statement is correct?
Reaction absorbs 150 kJ
Products have higher energy
Reaction releases 150 kJ
Temperature of surroundings decreases
Which process is endothermic?
Freezing water
Condensation of steam
Burning paper
Melting ice
A reaction occurs faster when:
Particles collide with lower energy
Activation energy is increased
Concentration is increased
Temperature is decreased
Which experiment best shows the effect of surface area on reaction rate?
Heating a gas in a cylinder
Dissolving coarse salt vs. fine salt
Changing pressure of nitrogen gas
Using a different catalyst
Which substance will decolourise bromine water?
Ethane
Ethanol
Ethanoic acid
Propene
Which statement about ethanol is correct?
It is an alkene
It contains the –COOH group
It can be oxidised to ethanoic acid
It reacts with hydrogen to form ethane
Identify the limiting and excess reactants in the reaction shown.
N2 is limiting and H2 is excess.
H2 is limiting and N2 is excess.
NH3 is both limiting and excess.
There is no limiting reactant.
What is the condensed structure for the picture above?
C2H4OH
C2H6OH
C2H7OH
C2H5OH
Which of the following shows the correct condensed structural formula of the compound that has 5 carbon atoms, 12 hydrogen atom and 1 oxygen atom?
Which of the following line formulas has a condensed formula of CH3CHCHCH(CH3)CH2CH3?
How many hydrogens are missing from this extended structural formula?
6
7
8
9
