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GCSE Chemistry
C6: Chemical Synthesis…read more

Slide 2

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Name and write the formulae for two pure acidic compounds
which are solids, three which are liquids and one that is a gas at
room temperature.
Citric Acid (C6H8O7(s))
Tartaric Acid (C4H6O6(s))
Sulphuric Acid (H2SO4(Aq))
Nitric Acid (HNO3(Aq))
Ethanoic Acid (C2H4O2(Aq))
Hydrogen Chloride (HCL(g))…read more

Slide 3

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Name and write the formulae for three
common alkalis.
Sodium Hydroxide (NaOH)
Potassium Hydroxide (KOH)
Calcium Hydroxide (Ca(OH)2)…read more

Slide 4

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Describe the four typical reactions of acids using
balanced equations to illustrate your answer.
Acid + Metal Salt + Hydrogen
The more reactive the metal, the faster the reaction
The speed of a reaction is indicated by the rate bubbles and hydrogen are given off
Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen
Mg(s) + 2HCl(aq) MgCl2 (aq) + H2(g)
Acid + Metal Oxide Salt + Water
Hydrochloric Acid + Copper Oxide Copper Chloride + Water
2HCl(aq) + CuO(s) CuCl2(aq) + H2O(l)
Acid + Metal Hydroxide Salt + Water
Sulphuric Acid + Calcium Hydroxide Calcium Sulphate + Water
H2SO4(aq) + Ca(OH)2(aq) CaSO4(aq) + 2H2O(l)
Acid + Metal Carbonate Salt + Water + Carbon Dioxide
Hydrochloric Acid + Calcium Carbonate Calcium Chloride + Water + Carbon Dioxide
2HCl(aq) + CaCO3(s) CaCl2+ H2O(l) + CO2(g)…read more

Slide 5

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What is pH and how are indicators used to
demonstrate this?
pH is the scale that measures the strength of an acid or
alkali. Indicators are used to estimate the pH of
solutions. Dyes in indicators turn a certain colour with
the strength of an acid or alkali which can then be
measured against the pH scale.…read more

Slide 6

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What makes a solution acidic? What makes it alkaline?
What happens in a neutralisation reaction?
A solution is acidic if it measures below pH7 and forms
aqueous hydrogen ions in water (H+(aq)). A solution is
alkaline if it measures above pH7 and forms
aqueous hydroxide ions in water (OH-(aq)).
When an acid and an alkali react together they form
a neutral solution (water) and salt. These products are
neutral and so the process is called neutralisation.
Acid + Alkali Salt + Water
Hydrogen in Acid + Hydroxide in Alkaline Water
H+(aq) + OH-(aq) H2O(l)…read more

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