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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. Ionic bonding occurs between

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

2. The pH scale runs from

-7 to 71 to 100 to 1000 to 14

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

Protons, ions and electronsElectrons, neutrons and quarksProtons, neutrons and photonsProtons, neutrons and electrons

4. Alkanes are hydrocarbons that contain only

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

5. Which of these generally increases the rate of a chemical reaction?

Decreasing the temperatureUsing a smaller volume of the same concentration solution aloneIncreasing the temperatureRemoving the reactants

6. A solution with pH 7 is

Not possibleStrongly alkaline (basic)Strongly acidicNeutral

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

atomic mass onlyalphabetical ordernumber of neutronsatomic number (number of protons)

8. Oxidation is best defined (in terms of electrons) as

gain of protonsloss of electronsgain of electronsloss of protons

9. An atom of sodium (atomic number 11) has how many electrons in a neutral atom?

1121123

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

2.5 mol/L0.25 mol/L4 mol/L1 mol/L

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