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S1 Unit 6 Chemical Recations
FC Qs
17
Science
Not Applicable
02/29/2012

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Cards

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