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🧪 Chemistry, NCEA

Years 11 to 13 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. Alkanes are hydrocarbons that contain only

at least one carbon-carbon double bondsingle carbon-carbon bonds (they are saturated)a carbon-oxygen double bondan -OH group

2. The pH scale runs from

1 to 10-7 to 70 to 140 to 100

3. Alkenes differ from alkanes because alkenes contain

at least one carbon-carbon double bondno carbon atomsonly single bondsan -OH group

4. Covalent bonding involves

sharing of electron pairs between non-metal atomstransfer of electrons from metal to non-metalno electrons at alla lattice of positive ions in a sea of electrons

5. The mole is a unit used to count

the number of protons in an atoma fixed number of particles (atoms, molecules or ions), equal to Avogadro's numbergrams of a substance directlythe volume of a gas only

6. What is the concentration of a solution made by dissolving 0.5 moles of solute in 2 litres of solution?

1 mol/L0.25 mol/L2.5 mol/L4 mol/L

7. Reduction is best defined (in terms of electrons) as

gain of electronsloss of electronsgain of protonsloss of neutrons

8. A molecule with a central atom surrounded by two bonding pairs and no lone pairs, such as carbon dioxide (CO2), has which shape?

LinearTetrahedralBentPyramidal

9. In the reaction Zn + Cu2+ -> Zn2+ + Cu, which species is oxidised?

Cu, since it gains electronsZn, since it loses two electrons to become Zn2+Cu2+, since it loses electronsZn2+, since it gains electrons

10. In a titration, 25 mL of an unknown acid exactly neutralises 20 mL of a 0.1 mol/L alkali solution, in a 1:1 mole ratio. What is the concentration of the acid?

0.08 mol/L0.125 mol/L0.02 mol/L0.1 mol/L

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