Demo. An invented family, made-up minutes, nobody's real child. The quizzes work: pass a round and watch the clock change.

See it asPiperYear 10 RangiYear 7 NovaYear 3 📚 Learning by year

🧪 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. The pH scale runs from

1 to 10-7 to 70 to 1000 to 14

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

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

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

Using a smaller volume of the same concentration solution aloneRemoving the reactantsDecreasing the temperatureIncreasing the temperature

4. Ionic bonding occurs between

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

5. Alkanes are hydrocarbons that contain only

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

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

loss of protonsgain of electronsgain of protonsloss of electrons

7. Using a catalyst in a reaction

is permanently changed into a new substanceslows the reaction downonly works at very low temperaturesspeeds up the reaction without being used up itself

8. A solution with pH 7 is

NeutralStrongly acidicStrongly alkaline (basic)Not possible

9. As pH decreases from 7 towards 0, a solution becomes

Less concentratedMore alkalineMore neutralMore acidic

10. How many moles are in 20 grams of a substance with a molar mass of 40 g/mol?

0.5220800

← back