specific for ocr gateway additonal science B.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what is an alkali? | a base which dissolves in water
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| what is the word equation for neutralisation? | acid + base - salt + water
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| which three compounds neutralise acids? | -metal oxides
-metal hydroxides
-carbonates
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| what is the word equation for metal oxides or metal hydroxides neutralising acids? | acid + oxide - salt + water
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| what is the word equation for carbonates neutralising acids? | acid + oxide - salt + water + carbon dioxide
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| what is a salt made from? | part of a base and part of an acid
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| how do you work out the name of a salt? | -the first part of the base goes to the first part of the salt
the second part of the acid goes to the second part of the salt
-the remaining parts join to make water
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| example of a word equation? | sodium hydroxide + hydrochloric acid - sodium chloride + water
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| example of a balanced symbol equation? | NaCl + NaOH - NaCl + H20
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| what type of salt is made from nitric acid? | nitrate
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| what type of salt is made from hydrochloric acid? | chloride
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| what type of salt is made from sulfuric acid? | sulphate
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| what ions does an acid solution contain? | hydrogen ions, H+, which are responsible for the reactions of an acid
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| what ions does an alkali solution contain? | hydroxide ions, OH-
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| what happens when an acid neutralises an alkali? | the hydrogen ions react with the hydroxide ions to make water
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| what is the symbol equation to show the neutralisation between acid and alkali solutions? | H+ + OH- - H20
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| what does the pH scale show? | how acidic or alkaline a substance is
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| what numbers do acids have on the pH scale? | 1-6
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| what number does neutral solutions have on the pH scale? | 7
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| what numbers do alkalis have on the pH scale? | 8-14
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| what number does a strong acid have on the pH scale? | 1
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| what colour on the pH scale is a strong acid? | red
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| what number does a strong alkali have on the pH scale? | 14
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| what colour on the pH scale is a strong alkali? | blue/purple
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| what does universal indicator solution measure? | the acidity of a solution
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| how do you use universal indicator solution? | -few drops are added to the test solution
-the colour of the solution is compared to a standard colour chart
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| what happens when you add an alkali to an acid? | -the pH at the start is low
-the pH rises as the alkali neutralises the acid. when neutral, the pH = 7
-when more alkali is added, the pH rises above 7
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| what happens when you add an acid to an alkali? | -the pH at the start is high
-the pH falls as the acid neutralises the alkali. when neutral, the pH = 7
-when more acid is added the pH falls below 7
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Created by:
jirwin
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