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- @An example of oxidation includes:
- The rusting of iron
- Heating Ammonium chloride
- Dissolving Calcium carbonate in water
-
- @Which substance is used for pickling onions?
- Ethanoic acid
- Hydrochloric acid
- Ethane
-
- @A gas which pollutes the atmosphere is:
- SOÛ
- COÛ
- Ar
-
- @What volume of liquid is in the measuring cylinder?
- #cylin2
- 8 cmÏ
- 6 cmÏ
- 9 cmÏ
-
- @Why are the components in crude oil separated by fractional distillation?
- Because they have different boiling points
- Because they are all liquid
- Because they are hydrocarbons
-
- @AlClÜ + ?NaOH ï Al(OH)Ü + 3NaC What is the missing number needed to balance the equation?
- 3
- 1
- 2
-
- @Washing soda crystals are made of:
- Sodium carbonate
- Magnesium sulphate
- Magnesium chloride
-
- @The electrode labelled 'Y' is connected to the negative terminal of a battery. This electrode is called:
- #electro1
- the cathode
- the anode
- an electrolyte
-
- @When chemical bonds are formed:
- Energy is released
- Energy is taken in
- Energy remains unchanged
-
- @An element that forms crystals composed of small molecules is:
- Iodine
- Diamond
- Magnesium
-
- @A substance, made of one kind of atom, is:
- an element
- a compound
- a mixture
-
- @Diffusion is when:
- Particles of different substances gradually become mixed
- Molecules come apart
- A substance goes straight from a solid to a gas
-
- @Which statement is INCORRECT for protons?
- Protons orbit the nucleus
- Protons are similar in mass to neutrons
- Protons carry a positive charge
-
- @Approximately how much iron is present in stainless steel?
- 74%
- 10%
- <1%
-
- @Sodium is a metal. Just using this information only, which of the following could be stated as a fact?
- It conducts electricity
- It is hard
- It has a very high melting point
-
- @Caesium is an alkaki metal in group 1. When placed in water it will produce:
- Caesium hydroxide and hydrogen
- Caesium oxide and hydrogen
- Caesium oxide and oxygen
-
- @In carbon dioxide, then main types of bond are:
- Covalent
- Ionic
- Van der Waals
-
- @The substance used to kill bacteria in tap water is:
- Chlorine
- Ammonia
- Bromine
-
- @If a lighted splint is put into a test tube containing hydrogen then it will:
- Make a popping sound
- Burn more brightly
- Make the splint go out
-
- @Approximately how much of the air is composed of nitrogen?
- 78%
- 21%
- 99%
-
- @How many oxides have a neutral pH?
- A few
- None at all
- A very large number of them
-
- @Which one of the following is sulphur not used for
- Making natural rubber 'softer' for tyres
- Making insecticides
- Making matches
-
- @Natural gas, used in the home in fires and cookers, is mainly:
- Methane
- Butane
- Propene
-
- @The halogens are elements all found in which group of the periodic table?
- Seven
- One
- Two
-
- @In the contact process, SOÛ and OÛ are reacted together to form SOÜ. This process is sped up by using:
- Vanadium pentoxide as a catalyst
- Very high temperatures
- Air rather than pure oxygen
-
- @Which one of the following changes is oxidation?
- CuÛO ï CuO
- NÛ ï NHÜ
- FeClÜ ï FeClÛ
-
- @If a fossil fuel burns with a yellow sooty flame then:
- there is not enough oxygen present
- there is too much oxygen
- there is just the correct amount of oxygen
-
- @What volume of water is in the measuring cylinder?
- #cylin1
- 45.0 cmÏ
- 40.5 cmÏ
- 55.0 cmÏ
-
- @If a solid will dissolve in a liquid, the liquid is called a:
- Solvent
- Solute
- Solution