9H: Using Chemistry

When methane burns completely in air we get
1. carbon dioxide + water
2. carbon dioxide only
3. water only
4. carbon + hydrogen + oxygen
When methane burns incompletely in air we get
1. carbon monoxide + water
2. carbon dioxide only
3. water only
4. carbon dioxide + water
Exothermic reactions
1. give out heat energy
2. take in heat energy
3. need heat to start
4. are the final stage of a reaction
Endothermic reactions
1. take in heat energy
2. give out heat energy
3. are the final stages of a reaction
4. is the way we can explain all chemical reactions
Whenever a chemical reaction takes place energy is
1. transferred
2. lost
3. gained
4. created
If we heat magnesium in air it forms magnesium oxide, which weighs more than the magnesium we started with. This is because
1. it has reacted with the oxygen forming a compound
2. the particles of ash have lodged between the particles of the magnesium making it heavier
3. the magnesium particles get bigger when we heat them making them heavier
4. the particles of the air sit on the surface of the magnesium making them heavier
Chemicals that react together are called
1. reactants
2. products
3. atoms
4. elements
The chemicals made when things react together are called
1. products
2. reactants
3. elements
4. metals
The majority of physical reactions are easily
1. reversible
2. stopped
3. started
4. used
In a chemical reaction a …… ………..is made
1. new substance
2. new gas
3. new solid
4. new liquid
Resources such as oil, plants, rocks etc are called
1. raw materials
2. reactants
3. products
4. substances
Which of these is not an indicator as to whether a reaction has taken place or not?
1. Change in state (solid to liquid)
2. Change in colour
3. Change in smell
4. A gas being given off
Which of the following is not a chemical change?
1. Dissolving sugar in water
2. Baking a loaf of bread
3. Burning a fuel
4. Striking a match
Which of the following is not a physical change?
1. Making copper sulphate from copper oxide and sulphuric acid
2. Freezing water to form ice cubes
3. Melting a bar of plain chocolate
4. Boiling a kettle full of water to produce steam
Reducing means
1. taking the oxygen away
2. taking the nitrogen away
3. making the chemical smaller
4. adding in oxygen
Which of the following is not one of the raw materials put into the blast furnace?
1. Molten iron
2. Iron ore
3. Coke
4. Limestone
Which of these apply to metamorphic rocks
1. formed by extremes of heat and pressure from other rocks
2. form in layers from particles settling out in water
3. formed when molten substances cool
4. usually soft
Which of these apply to igneous rocks
1. formed when molten substances cool
2. form in layers from particles settling out in water
3. usually soft
4. contain fossils
Which of these apply to sedimentary rocks
1. form in layers from particles settling out in water
2. formed by extremes of heat (not melting) and pressure from other rocks
3. formed when molten substances cool
4. usually very hard
Which of these rocks is not a sedimentary rock?
1. marble
2. limestone
3. sandstone
4. shale
Which of these rocks is not a metamorphic rock?
1. sandstone
2. quartzite
3. marble
4. slate
Which of these rocks is not an igneous rock?
1. shale
2. granite
3. basalt
4. gabbro
An ore is
1. a metal bearing rock
2. a way to extract metals
3. an unreactive metal
4. a reactive metal dissolved in water
If we heat calcium carbonate strongly what gas is given off?
1. Carbon dioxide
2. carbon monoxide
3. oxygen
4. hydrogen
We can test for carbon dioxide by
1. bubbling through limewater
2. dissolving it in water
3. testing with a lit splint
4. testing with a glowing splint
Bauxite is the ore for
1. aluminium
2. iron
3. copper
4. magnesium
Magnetite is an ore of
1. iron
2. aluminium
3. copper
4. gold
Which of the following list is not made from oil
1. cotton
2. plastics
3. diesel
4. fuel gas
If we heat magnesium in air it forms magnesium oxide, which weighs more than the magnesium we started with. This is because
1. it has reacted with the oxygen forming a compound
2. the particles of ash have lodged between the particles of the magnesium making it heavier
3. the magnesium particles get bigger when we heat them making them heavier
4. the particles of the air sit on the surface of the magnesium making them heavier
Which statement is true?
1. the formula for a particular compound is always the same
2. the formula for a particular compound is never the same
3. the formula for a particular compound is sometimes the same but can be different
4. The formula for a particular compound is impossible to predict
In a chemical reaction the total mass stays the same. This is because
1. the new substances formed can only be made from the substances already there
2. the new substance cannot weigh less if the reaction is to happen
3. the new substances gain mass from elsewhere in order to be the same weight
4. the mass stays the same as no new products are made