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17 Cards in this Set

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  • Back
Acid + a base
Acid + base = metal compound (salt) + water
Acids and Bases are chemical opposites i.e. they remove the effect of each other.

If an acid is added to a base or vice versa then Neutralisation is said to have occured. When equal amounts of a base is added to an acid you should obtain a pH of 7.
ph Scale
is a way we can measure how acidic or basic a substance is

ph of 7 is neutral. (green)
Acidic solutions will have a ph between 1 and 6. (red)

Basic solutions will have a ph between 8 and 14. (purple)
Test for hydrogen gas
The lighted match is put near the top of the test tube and it makes a squeaky pop.
Chemical Change
1) Temperature
2) Colour
3) Bubbles
4) New Solid
Change of state
1) melting (solid to liquid)
2) freezing (liquid to solid)
3) evaporatin (liquid to gas)
4) condensation (gas to
5) sublimation (solid to gas)
Chemical changes
Involve reactants becoming products. The products can easily be changed back into reactants
Physical Changes
1) Can easily be coverted
back to their original
2) Are still the same
substance but in a
different form
3) Often involving a change
of state
1) All substances that turned
blue litmus red are acidic.
2) All substances that turned
red litmus blue are basic.
3) The substances which had
no effect on the litmus
are said to be neutral
Basic substances
sodium hydroxide
ammonia solution
calcium hydroxide
Acids and metals
When metals react with acids they all produce HYDROGEN GAS

a metal + an acid = a metal compound + hydrogen gas
Tap water
distilled water
colgate toothpaste
Acidic substances
hydrochloric acid
acetic acid
lemon juice
sulfuric acid
sodium chloride
Acids + metal carbonates
Acid + metal carbonate = metal compound + carbon dioxide + water
Test for Carbon dioxide gas
The marble reacts with hydrochloric acid and the gas from those reactants enters the limewater which then goes milky if carbon dioxide is present.
Acids and metal carbonates
When acids react with metal carbonates they all produce carbon dioxide gas. The other product is called a salt or metal compound and cannot be seen as it is dissolved in the water. We could observe this product if we evaporated off the water. Water is also produce.
Test for oxygen gas
The glowing splint relights