LV Chemical properties and changes
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25 Terms
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What is a chemical change?
When particles change into different particles
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What is a physical change?
A change in which particles do not change
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Why do reactions with a gaseous reactant appear to increase in mass as the reaction occurs?
Because the mass of the gas that reacts is not measurable before the reaction
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What is thermal decomposition?
A reaction in which a compound breaks into smaller compounds and elements by the action of heat
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What is a salt?
A compound formed when the H atoms of an acid are replaced by a metal (or ammonium) in a neutralisation reaction
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What is formed when an acid reacts with a metal
a salt + hydrogen
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What is formed when an acid reacts with a metal carbonate
a salt + water + carbon dioxide
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What is formed when an acid reacts with an alkali
a salt + water
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What pH is neutral
7
10
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What is an indicator
a compound that has different colours in different levels of acidity
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What colour is UI in acid, neutral, alkali
red/orange, green, blue/purple
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What conditions are required for rusting of iron to occur
presence of air and water
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which metal can rust?
iron
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What are some examples of physical changes
melting, boiling, freezing, condensing, dissolving, diffusing
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How does the mass of reactants compare to that of products in a chemical change?
They are always the same
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Why do reactions that produce a gas appear to decrease in mass as the reaction occurs?
Because the gas leaves the reaction system so its mass is gone
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What salt is formed when nitric acid is neutralised?
a nitrate salt
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What salt is formed when sulfuric acid is neutralised?
a sulfate salt
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What salt is formed when hydrochloric acid is neutralised?
a chloride salt
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What is the pH range of acids
6 and below
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What is the pH range of alkalis
8 and above
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What colour is phenolphthalein in acid, alkali
colourless, pink
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What colour is litmus in acid, neutral, alkali
red, purple, blue
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What conditions are required for rusting of iron to occur
presence of air and water
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What elements do all acids contain?
Hydrogen
Note 
Flashcards (37)