Chemistry Revision Fun Quiz

Tips to writing a balanced chemical equation. Example C₇H₁₈ + O₂ --> CO₂ + H₂O

• oxygen atom as last to balance

• carbon atom as last to balance

• hydrogen atom as last to balance

• none of the above

C₇H₁₈ + X O₂ --> 7CO₂ + 8H₂O. The X is ...

• 9

• 10

• 11

• 11.5

Acid reacts with base to produce

• salt and water

• salt

• solid

• solid and water

Copper reacts with sodium nitrate to produce

• copper nitrate and sodium

• copper nitrate

• sodium copper nitrate

• none of the answers

Answer explanation

Remember of reactivity series. Sodium is more reactive than copper, hence copper cannot replace the sodium in the sodium nitrate.

if 44 g of propane completely react with 160 g of oxygen, determine the volume of CO₂ produced.

• 71.9 dm³

• 67.1 dm³

• 50.0 dm³

• 63.2 dm³

Answer explanation

Remember if the question stated "react completely", then no need to determine which is limiting or excess reagent. As the mass given for both propane and oxygen are fully used up. You can use any of the reactant to calculate the volume of carbon dioxide.

Determine the % yield. From the experiment, it yields 63.6 g of chlorobenzene, but the experimental data is 73.0 g.

• 100%

• 90%

• 88.0 %

• 88.6 %

Answer explanation

% yield = actual yield / theoretical yield x 100 %

Which of the following has hydrogen bonding as intermolecular forces.

• Cl₂

• H₂O

• HCl

• none of the answers

Which of the following is non-polar molecules?

• Cl₂

• HCl

Answer explanation

Non-polar molecule has equal electronegativity between the atom. Hence they have Van Der Waals (London Dispersion Forces) as their intermolecular bonding.

The liquid is more viscosity and more thicker. What is the reason?

• Due to its stickyness

• Due to its viscousness

• Due to intermolecular bonding

• Due to intramolecular bonding

Answer explanation

Viscosity - due to the intermolecular (secondary) bonding between the molecules.

Which of the following conditions favor the liquification of methane. Choose the best answer.

• Below compressibility factor of 1.0

• more than 250 atm and compressibility factor below 1.0

• less than 250 atm and compressibility factor above 1.0

• less than 250 atm and compressibility factor below 1.0