chemical reactions Flashcards
what is a chemical reaction?
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
what does a chemical reaction do?
creates a new substance.
what can the substances be in a chemical reaction?
elements or compounds.
what is combustion?
the process of burning something.
what is decomposition?
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.
State three everyday life chemical reactions.
baking, photosynthesis, burning wood, digestion, rusting, fireworks and washing up.
how are chemical reactions used?
Chemical reactions make new substances. During a reaction energy is transferred to, or from, the surroundings.
can chemical reactions be reversed?
NO only physical reactions can.
What happens to atoms during a chemical reaction?
the atoms are rearranged
Rate of reaction is determined with how frequently atoms collide and with how much….
energy there is
How many methods are there for increasing the rate of reaction? and what are they?
there are four and they are
- concentration
- temperature
- catalysts
- size of particle
Displacement reactions involve a metal and….
a compound of a different metal
True or false? No atoms are created or destroyed in a chemical reaction.
true
what are the 3 words from the combustion triangle.
oxygen
heat and
fuel
