Grade 14 Chemistry Quiz

Which is the correct equation for the first ionisation energy of tin, Sn?

• Sn⁺(g) → Sn²⁺(g) + e−

• Sn(g) → Sn⁴⁺(aq) + e−

• Sn(g) → Sn⁺(g) + e−

• Sn(s) → Sn²⁺(aq) + e−

Which of the following statements about isotopes is not correct?

• The carbon-14 isotope contains 2 more neutrons.

• In a magnesium-26 isotope, there are 14 neutrons.

• In silicon-30 isotope, there are 14 protons.

• Isotopes contain different number of protons.

Which of these correctly shows the identity of an ion with 18 electrons and 16 neutrons?

• ₃₅Cl⁻

• ₃₁P³⁻

• ₁₈O²⁻

• ₁₄N³⁻

Which of the following has an incomplete sub-shell?

• F

• Ne

• Ca

• Zn

Element E is located in Period 3. Using the successive ionisation data given, what is the electron configuration of element E?

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 3p²

• 1s² 2s² 2p⁶ 3s² 3p⁴

• 1s² 2s² 2p⁶ 3s² 3p⁵

Which formula represents the empirical formula of a compound?

• C₃H₆

• C₆H₁₂O₆

• CH₃CH₂CHO

• CH₂OHCH₂COOH

What is the number of molecules in 300 cm³ of nitrogen gas at room temperature and pressure?

• 1.51 x 10²²

• 7.53 x 10²⁴

• 1.52 x 10²⁵

• 7.53 x 10²¹

5.5 g of potassium hydroxide, KOH, is dissolved in 150 cm³ of solvent to produce solution with Y mol dm⁻³. What is Y?

• 0.00157

• 0.0157

• 0.000653

• 0.653

Iron reacts with sulfur as shown in the following equation. 170.0 g of iron is reacted with 68 g of sulfur. What is the mass of the iron sulfide formed when this reaction is complete?

• 267.80 g

• 81.75 g

• 186.21 g

• 454.01 g

When a hydrocarbon is burnt in excess oxygen, 9.70 g of carbon dioxide and 7.92 g of water are made. What is the empirical formula of the hydrocarbon?

• CH

• CH₂

• C₂H₄

• CH₄