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83 Cards in this Set

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  • Back
What is the composition of air?
78%nitrogen, 20%oxygen, 1%carbon dioxide, 1%water vapour and noble gases.
Is air a mixture, compound, or element?
mixture
Which is the only reactive gas in air?
Oxygen
What is the percentage of oxygen in the air?
20%
Describe a physical test & result for the purity of water.
Test its boiling point, it will be 100 degrees centigrade
Describe two chemical tests & their results to test for the presence of water.
1. add anhydrous copper sulphate - colour change from white to blue.
2. add anhydrous cobalt chloride - colour change from blue to pink.
Describe the test & result for Carbon dioxide.
Bubble the gas through limewater - turns from clear to cloudy.
Descibe the test & result for hydrogen.
Test with a lighted splint, burns with a squeaky POP!
Describe the test & result for oxygen.
test with a glowing splint, it will relight.
Name the gas given off when potassium permanganate (vii) is decomposed.
oxygen
Name the gas that is given off when limestone is heated.
Carbon dioxide
What is the chemical name for limestone?
calcium carbonate
Which separation technique would be used to separate sand from a mixture of salt solution and water?
Filtration
Which separation technique would be used to separate the salt from a salt solution?
Evaporation
Which separation technique would be used to separate both the salt and the water?
Distillation
Which separation technique would be used to separate a mixture of ethanol and water?
Fractional distillation
Which separation technique would be used to separate the colours in a selection of dyes?
Chromatography
In salt solution, what is the name of the solute?
Salt - sodium chloride
In salt solution, what is the name of the solvent?
Water
What is the name for a soluble solid?
Solute
Define a saturated solution.
A solution in which no more of the solute can be dissolved at that temperature.
Solubility usually increases with an increase in temperature. Which chemical did we test that did not?
Sodium Chloride
Write the word equation for combustion.
fuel + oxygen -> carbon dioxide + water vapour + soot (carbon)
Which two elements are contained in the fuel (hydrocarbon)?
Carbon and hydrogen
Which gas is needed for fuels to burn?
Oxygen
Name three fuels.
Coal, oil, gas (methane - natural gas), wood, petrol
Rusting requires two chemicals to react with the iron or steel. What are they?
Oxygen and water
Name three ways to prevent rusting.
Painting, galvanising, oiling
Complete: metal + oxygen ->

What type of chemical reaction is this?

Why is there an increase in mass?
Metal oxide

Oxidation

The element is combining with oxygen in the air to form a compound.
Complete: copper + oxygen ->

What type of chemical reaction is this?

Why is there an increase in mass?
Copper oxide

Oxidation

The element is combining with oxygen in the air to form a compound.
Complete: magnesium + oxygen ->

What type of chemical reaction is this?

Why is there an increase in mass?
Magnesium oxide

Oxidation

The element is combining with oxygen in the air to form a compound.
What colour would you see when copper is heated in oxygen?
Changes from pink/brown to black
What colour change would you see when magnesium is heated in oxygen?
light grey to white
Complete this equation:

metal + water ->

What colour change would you see if green universal indicator solution was added to the liquid produced?
metal hydroxide + hydrogen

from green to blue/purple (alkaline solutions)
Complete this equation:

calcium + water ->

What colour change would you see if green universal indicator solution was added to the liquid produced?

Is this solution acidic, neutral or alkaline?
calcium hydroxide + hydrogen

from green to blue/purple (alkaline solutions)

alkaline
Complete this equation:

metal + acid ->
metal salt + hydrogen
Complete this equation:

magnesium + hydrochloric acid ->
magnesium chloride + hyrdrogen
Complete this equation:

magnesium + sulphuric acid ->
magnesium sulphate + hydrogen
Complete this equation:

magnesium + nitric acid ->
magnesium nitrate + hydrogen
Complete this equation:

metal oxide + acid -> (base)
metal salt + water
Complete this equation:

zinc oxide + sulphuric acid->
zinc sulphate + water
Complete this equation:

metal hydroxide + acid -> (alkali)
metal salt + water
Complete this equation:

sodium hydroxide + hydrochloric acid ->

What type of chemical reaction is this?
sodium chloride + water

Neutralisation
What is a thermal decomposition reaction?
A reaction in which a compound is broken down into simpler substances.
Complete this word equation:

Carbonate + acid ->
Salt + water + carbon dioxide
Complete this word equation:

Calcium carbonate + hydrochloric acid ->
calcium chloride + water + carbon dioxide
Complete this word equation:

copper carbonate + sulphuric acid ->
copper sulphate + water + carbon dioxide
Which gas is given off when carbonates are heated or added to acid?
carbon dioxide
Complete this word equation:

iron + copper sulphate ->
iron sulphate + copper
Name five properties of metals
1. good conductors of heat and electricity
2. malleable,
3. sonorous
4. high melting points
5. shiny
6. form basic oxides
Name five properties of non-metals.
1. Poor conductors of heat and electricity - insulators
2. brittle
3. low melting and boiling points
4. dull
5. form acidic oxides
Name five metals
magnesium
copper
sodium
calcium
zinc
lithium
titanium
aluminum
potassium
iron
nickel
cobalt
Name five non-metals
oxygen
sulphur
carbon
nitrogen
helium
hydrogen
argon
xenon
radon
chlorine
iodine
bromine
What type of oxide do metals form?
basic
What type of oxide do non-metals (except Hydrogen) form?
Acidic
What type of oxide does hydrogen form?
neutral - water
Acids have a pH value from ___ to ___.
zero - six
Neutral substances have a pH value of ___
seven
Alkalis have a pH value from ___ to ___
eight - fourteen
A strong acid could be _______ having a pH of 1.
hydrochloric, sulphuric or nitric acid
A strong alkali could be _____ having a pH of 14.
sodium hydroxide solution
An example of a neutral substance is _______.
water, salt or sugar solution
Name two everyday uses of neutralisation and what is used to neutralise the excess acid or alkali.
1. neutralising acidic soil - Lime (calcium oxide) is used by farmers for this

2. treating acid indigestion - a weak alkali such as magnesium hydroxide (milk of magnesia, an antacid is used
Why do we use weak acids or alkalis for neutralising?
So that the neutralisation can be done carefully and more can be added if necessary. Strong acids or alkalis would cause more damage, making it worse.
Name three pollutant gases and how these gases are formed.
carbon dioxide - formed from combustion

sulphur dioxide - formed by burning fossil fuels

nitrogen oxides - formed from vehicle exhausts
What are the effects of the three pollutant gases (carbon dioxide, sulphur dioxide and nitrogen oxide) on the environment?
Carbon dioxide is responsible for the greenhouse effect -- global warming

Sulphur dioxide and nitrogen oxides dissolve in rain water and form acid rain - pH lower than 6.

All rain is slightly acidic, but these pollutant gases make it more acidic
From this list of elements, which forms a pollutant gas?

sulphur, carbon, copper, magnesium, zinc, sodium
carbon

sulphu
From this list of elements, which is a dull, yellow solid?

sulphur, carbon, copper, magnesium, zinc, sodium
sulphur
From this list of elements, which is used for galvanizing?

sulphur, carbon, copper, magnesium, zinc, sodium
zinc
From this list of elements, which can be used for hot water pipes?

sulphur, carbon, copper, magnesium, zinc, sodium
copper
From this list of elements, which forms a white oxide when heated in air (oxygen)?

sulphur, carbon, copper, magnesium, zinc, sodium
magnesium
From this list of elements, which is the most reactive metal and how must it be stored?

sulphur, carbon, copper, magnesium, zinc, sodium
sodium - it has to be stored in oil
Name two oxides that do not change chemically when heated
magnesium oxide, copper oxide, zinc oxide
What do compound names end in when there are two elements chemically combined? Give examples.,
-ide

carbon dioxide, sodium chloride, sulphur dioxide, nitrogen oxide, aluminium iodide, iron sulphide, cobalt chloride, copper sulphide
What do compound names end in when there are three or more elements chemically combines? Give an example.
-ate

copper sulphate, copper carbonate, calcium carbonate, zinc nitrate
Define 'element'.
A pure substance that cannot be broken down into simpler substances. Elements are made from only one type of atom, e.g. copper is made from copper atoms.
Define mixture.
Two or more elements not chemically combined
Define compound
Two or more elements chemically combined
When aluminum powder and solid iodine are mixed together and heated, a vigourous reaction occurs. The name of the product is....
aluminum iodide
Name three pieces of evidence to show that a chemical reation has taken place.
1. colour change
2. gas given off (bubbles / effervescence) and giving out heat (exothermic)
3. taking in heat (endothermic)
Name the three magnetic metallic elements in the Periodic Table.

Name the alloy that is magnetic made from one of these elements.
iron, cobalt, nickel

steel (made from iron)
When lighting the Bunsen burner, in what position should the air hole be?
closed
Which flame is used to heat solids and where is this flame the hottest?
roaring blue

just above the blue cone