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Terms in this set (17)
What happens in every chemical reaction?
a new substance is formed
What things may happen in a chemical reaction?
a colour change, a gas formed, a solid formed or an energy change
What are Indicators?
substances that change colour to show which things are acids and which are alkalis
What do we use to crush chemicals and plant material?
A mortar and pestle
What is Universal Indicator used for?
to show the pH of substances
What is the pH scale is used to measure?
how acidic or alkaline a substance is
What pH do acids have?
below pH 7
What pH do alkalis have?
above pH 7
What is the pH of a neutral substance?
When an acid is diluted with water what happens to its pH?
its pH increases
What is a neutralisation?
when an acid and alkali are mixed to make a neutral solution
What do indigestion tablets do?
neutralise excess stomach acid
What variables can be altered to change the speed of a reaction?
concentration, temperature or the size of the solid pieces
What causes acid rain?
acidic gases from cars, factories etc dissolving in rain clouds
What is the effect of acid rain on plants, animals, stonework & metal structures,
animals and plants can die, stonework and metal structures can be damaged
How can acid rain be prevented?
reduce the amount of acidic gases being released into atmosphere e.g. use public transport, cut down on electricity consumption
How can acidified soil or water be treated?
add lime to neutralise the acid
THIS SET IS OFTEN IN FOLDERS WITH...
S1-Unit1-Safety and measurements
S1-Unit3-Cells to systems
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