GCSE Chemistry - Chemical Changes

Revision for the chemical changes topic. Resources used: Kerboodle textbook p.84-99.

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What is the formula of Hydrochloric acid?
HCL
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What is the formula of Nitric acid?
NHO3
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What is the formula of Sulfuric acid?
H2SO4
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What is the pH scale?
a measure of how ACIDIC or ALKALI something is.
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If a universal indicator is added to a solution and it turns dark blue/purple what is the substance?
a STRONG ALKALI
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If a universal indicator is added to a solution and it turns dark orange/red what is the substance?
a STRONG ACID
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What is an indicator?
a dye that changes colour depending on whether it's above or below a certain pH
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what do wide range indicators contain in terms of dyes?
a mixture of dyes
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What are wide range indicators used for?
estimating pH
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How can you measure the pH value electronically?
using a pH probe or meter
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is measuring a pH electronically more accurate than using an indicator?
Yes
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What is an acid?
a substance
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What do acids form?
aqueous solutions
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Acids form aqueous solutions with a pH of less that___.
7
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Acids form ____ in water.
H+
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What is a base?
any substance that will react with an acid to form a salt
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What is an alkali?
a base that dissolves in water
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An alkali dissolves in water to form a solution with a pH greater than ___.
7
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Alkalis form ___ ions in water.
OH-
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What is a reaction between acids and bases called?
neutralisation
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Acid + Base -> ___ + ___
salt + water
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Water is formed because ___ ions react with ___ ions to form water
H+ & OH-
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What charge do hydrogen ions have?
positive
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What charge do hydroxide ions have?
negative
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When an acid neutralises a base the products are ___.
neutral
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Titrations are used to find out ___.
concentration
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___ indicators should be used with titrations.
single
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Acids produce ___ in water.
protons
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Acids ___ in water - they produce hydrogen ions (H+ ions which are basically just a proton).
ionise
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Sulfuric (H2SO4), Hydrochloric (HCL) and Nitric (HNO3) acids are all ___.
strong acids
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Ethanolic, Citric and Carbolic acids are all ___.
weak acids
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A reversible ionisation of a weak acid sets up ___ between the dissociated and undissociated acid.
an eqalibrium
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Other cards in this set

Card 2

Front

What is the formula of Nitric acid?

Back

NHO3

Card 3

Front

What is the formula of Sulfuric acid?

Back

Preview of the front of card 3

Card 4

Front

What is the pH scale?

Back

Preview of the front of card 4

Card 5

Front

If a universal indicator is added to a solution and it turns dark blue/purple what is the substance?

Back

Preview of the front of card 5
View more cards

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