1. Lemons and limes have a sharp and bitter taste and have a pH of 2. This is because they contain:
A. Limonene
B. Citric acid
C. Sprite
D. Hydrochloric acid
2. Particles are closely packed together but able to flow freely past each other in:
A. Solids
B. Liquids
C. Gasses
3. I have made a cup of tea at the beach and accidentally added a spoonful of sand instead of sugar.
What separation technique could I use to remove the sand?
A. Distillation
B. Simple Filtration
C. Separating Funnel
D. Scoop out the sand with a spoon
4. I have tied a balloon full of gas to a weight. It is floating and would float away if not tied down.
Carefully I ignite it using a lit splint tied to the end of a metre stick. It ignites rapidly with a bang
and a whoosh and some flame. The balloon likely contained:
A. Chlorine
B. Oxygen
C. Helium
D. Hydrogen
5. All Metals are shiny, malleable and good conductors of electricity. Some are very reactive,
whereas some are unreactive. Which metals in the list are the least reactive?
A. Copper and Tin
B. Sodium and Potassium
C. Calcium and Magnesium
D. Platinum and Gold
6.Occasionally a substance will change directly from a solid to a gas when it is heated, for example
Iodine crystals. This process is called:
A. Dissolving
B. Melting
C. Sublimation
D. Evaporation
7. In Brazil many cars run on Ethanol as it can be made by fermenting sugar cane using water and
yeast. How do they separate the Ethanol from the alcohol and water water mixture?
A. Using a separating funnel
B. Simple Filtration
C. Distillation
D. Chromatography
8. The air we breathe is made up of 78% Nitrogen, 21 % Oxygen and 1% Argon (and other gasses)
We have made a sample of pure oxygen in the lab by decomposing Hydrogen Peroxide (H202) using
Manganese (IV) Oxide catalyst. To test if we have made pure Oxygen we should:
A.
B.
C.
D.
Place a lit splint in front of the test tube; the gas ignites with a pop
Place a glowing splint into the test tube; the splint relights into a flame
Bubble the gas through lime water; the water changes from clear to cloudy
Place a lit splint into the test tube; the gas extinguishes the flame
9. Calcium Carbonate (e.g. Marble or limestone) has the formula CaCO3. How many elements is
this compound made from?
A. Six
B. Three
C. Two
D. Five
10. You are at a fireworks display and watch several rockets explode in the sky. One of the
fireworks sends out a bloom of bright red stars. To produce a red colour in the flame the firework
may have contained:
A. Red dye
B. Strontium Salts
C. Copper Salts
D. Sodium Salts