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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. An atom is made up of which three types of subatomic particle?

Protons, ions and electronsProtons, neutrons and electronsProtons, neutrons and photonsElectrons, neutrons and quarks

2. Ionic bonding occurs between

a metal and a non-metal, through transfer of electronstwo identical atoms onlytwo metals, through a sea of delocalised electronstwo non-metals, through sharing electrons

3. The mole is a unit used to count

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

4. Where are protons and neutrons found in an atom?

Spread evenly throughout the atomOrbiting the nucleus in shellsIn the nucleusOnly in the outer shell

5. Elements in the periodic table are arranged in order of increasing

atomic number (number of protons)number of neutronsalphabetical orderatomic mass only

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

4 mol/L2.5 mol/L1 mol/L0.25 mol/L

7. Increasing the concentration of a reactant in solution generally increases the rate of reaction because

there are more particles in the same volume, so collisions between reacting particles happen more oftenthe particles move faster individuallythe reaction becomes exothermicthere is less energy needed for each collision

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

PyramidalBentTetrahedralLinear

9. Which of these best explains why noble gases (Group 18) are generally unreactive?

They already have a full outer electron shell, so they have little tendency to gain, lose or share electronsThey only exist as liquids at room temperatureThey have no electrons at allThey are all radioactive

10. An alkene such as ethene can be converted into an alcohol such as ethanol by which type of reaction?

Polymerisation of many ethene moleculesSubstitution of a hydrogen atom for an -OH groupCombustion in excess oxygenAddition of water (hydration) across the carbon-carbon double bond

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