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- @Molten potassium iodide has a current passed through it. What gas is produced?
- #molten
- Iodine
- Potassium
- Postassim Iodide
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- @To break chemical bonds you:
- Give heat energy
- Remove heat energy
- Do not add or remove heat energy
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- @Which one of the following does not contain ionic bonds?
- NÛ
- NaCl
- AlÛClÜ
-
- @What is the chemical symbol for silver?
- Ag
- S
- Sr
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- @Which of the following is incorrect for electrons?
- They carry a smaller negative charge than protons positive charge
- They can be removed from the atom altogether
- In a neutral atom there are as many as many protons
-
- @A substance not used in the production of iron is:
- Sulphur
- Hot air
- Coke
-
- @Aircraft frameworks are usually made of:
- Aluminium
- Zinc
- Tungsten
-
- @What two substances are necessary for rusting to occur?
- Air and water
- Water and an oxide
- Oxygen and nitrogen
-
- @The temperature diamond melts at is:
- 3550Ì
- 95Ì
- 300Ì
-
- @Why is chlorine added to water in swimming pools?
- Disinfect the water
- As a bleaching agent
- To soften the water
-
- @Hydrogen gas enters at the left, and is burning on the right. What can be seen on the cold surface?
- #burn
- Water droplets
- Soot
- Yellowish deposit
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- @Nitrogen is used to make Ammonia. The process is called the:
- Haber process
- Frasch process
- Contact process
-
- @Roughly how much of the Earth's crust is made by oxygen (in various compounds)?
- 47%
- 5%
- 21%
-
- @What happens to sulphur when it is heated with a blue bunsen flame?
- It changes colour
- It sublimes
- It's immediately converted to sulphur dioxide
-
- @Natural gas, used in the home in fires and cookers, is mainly:
- Methane
- Butane
- Propene
-
- @Which of the following sets contains three elements from the same group of the periodic table?
- Li, Na and K
- Na, Mg and Al
- N, S and Br
-
- @The reaction between powdered magnesium and dilute sulphuric acid can be sped up by:
- Warming the mixture
- Adding water
- Using acid that is more dilute
-
- @Which one of the following changes is oxidation?
- CuÛO ï CuO
- NÛ ï NHÜ
- FeClÜ ï FeClÛ
-
- @What is the name of the liquid found between the plates of a car battery?
- Sulphuric acid
- Nitric acid
- Sodium carbonate
-
- @When burnt, which one of the following does NOT produce pollution?
- Hydrogen
- Diesel oil
- Wood
-
- @This thermometer reads 0.1ÌC too low. The correct temperature reading is:
- #thermom1
- 43.9Ì
- 43.8Ì
- 43.7Ì
-
- @The diagram shows the reuslts of a chromotography experiment. The sample S does NOT contain:
- #chrom
- Samples W and Z
- Samples X and Y
- Samples W and Y
-
- @What is the mass of each element present in one mole of calcium chloride (CaClÛ)
- Calcium, 40g and Chlorine, 71g
- Calcium, 20g and Chlorine, 35.5g
- Calcium, 80g and Chlorine, 35.5g
-
- @Dilute sulphuric acid reacts with:
- Zinc oxide to produce Zinc sulphate and water
- Copper to produce hydrogen
- Sodium carbonate to produce oxygen
-
- @The liquid in the water allows electricity to flow through it when X and Y are connected to a battery. The liquid is:
- #electro1
- an Electrolyte
- a Conductor
- a Cathode
-
- @An exothermic reaction is:
- One that produces heat energy
- One that absorbs heat energy
- One where there is no heat energy change
-
- @Which statement about covalent bonds is true?
- They are as strong as ionic bonds
- They are present in some metals
- They are the weakest type of bonds found
-
- @The elements in copper carbonate are:
- Oxygen, copper and carbon
- Copper and carbon
- Copper, carbon, nitrogen and oxygen
-
- @During the production of iron from iron ore, which one of the following is NOT used in the blast furnace?
- Slag
- Limestone
- Coke
-