C1.3 Reactions Flashcards
(16 cards)
What is a chemical reaction?
A change where atoms are rearranged to create new substances.
Give two signs that a chemical reaction might be happening.
Change in temperature
Are changes of state chemical reactions or physical changes?
Physical changes.
What do atoms do in a chemical reaction?
They rearrange and join together differently.
What does a word equation show?
The names of the reactants and products in a chemical reaction.
In a word equation
where are the reactants written?
In a word equation
where are the products written?
What is an oxidation reaction?
A chemical reaction in which a substance reacts with oxygen.
What is combustion?
A rapid oxidation reaction that gives out light and heat.
What is a decomposition reaction?
A chemical reaction in which a compound breaks down into simpler substances.
What is thermal decomposition?
A decomposition reaction caused by heating a substance.
What is the principle of conservation of mass?
In a chemical reaction
If you start with 100g of reactant and produce 56g of one product and some of another
what is the mass of the other product?
What is an exothermic reaction?
A reaction that transfers energy from the reactants to the surroundings (makes things hotter).
What is an endothermic reaction?
A reaction that transfers energy from the surroundings to the reactants (makes things colder).
What does a ratio compare?
Values.
