Science Chemistry reactions, acids and alkalis Flashcards
What is a reactant?
They are substances that react together, shown before the arrow in an equation
List four observations that show a
chemical reaction has happened.
colour change, temperature change, formation of gas and formation of solid
What is a product?
It is new substances formed in a chemical reaction, shown after the arrow in an equation
What is an oxidation reaction?
It is a reaction in which a substance combines with oxygen
What is a combustion reaction?
It is a reaction in which a fuel burns in oxygen
Test for oxygen gas
A glowing splint relights
What is rusting?
The corrosion of iron and steel
What is corrosion?
It is the destruction of metals by chemical reactions with substances in the environment
What is reactivity?
It is the tendency of a substance to undergo a chemical reaction
What is a displacement reaction?
It is a reaction where a more reactive element takes the place of a less reactive element in a compound
Indicators change colour
depending on if the solutions are acidic or alkaline
The formula for hydrochloric acid is
HCl
The formula for sodium hydroxide is
NaOH
Metal + acid ⎯→
Salt + hydrogen
Test for hydrogen gas
A lighted splint causes a squeaky pop
