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gcse science C4 - A

specific for ocr gateway additonal science B.

QuestionAnswer
what is an alkali? a base which dissolves in water
what is the word equation for neutralisation? acid + base - salt + water
which three compounds neutralise acids? -metal oxides -metal hydroxides -carbonates
what is the word equation for metal oxides or metal hydroxides neutralising acids? acid + oxide - salt + water
what is the word equation for carbonates neutralising acids? acid + oxide - salt + water + carbon dioxide
what is a salt made from? part of a base and part of an acid
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
example of a word equation? sodium hydroxide + hydrochloric acid - sodium chloride + water
example of a balanced symbol equation? NaCl + NaOH - NaCl + H20
what type of salt is made from nitric acid? nitrate
what type of salt is made from hydrochloric acid? chloride
what type of salt is made from sulfuric acid? sulphate
what ions does an acid solution contain? hydrogen ions, H+, which are responsible for the reactions of an acid
what ions does an alkali solution contain? hydroxide ions, OH-
what happens when an acid neutralises an alkali? the hydrogen ions react with the hydroxide ions to make water
what is the symbol equation to show the neutralisation between acid and alkali solutions? H+ + OH- - H20
what does the pH scale show? how acidic or alkaline a substance is
what numbers do acids have on the pH scale? 1-6
what number does neutral solutions have on the pH scale? 7
what numbers do alkalis have on the pH scale? 8-14
what number does a strong acid have on the pH scale? 1
what colour on the pH scale is a strong acid? red
what number does a strong alkali have on the pH scale? 14
what colour on the pH scale is a strong alkali? blue/purple
what does universal indicator solution measure? the acidity of a solution
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
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
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
Created by: jirwin