chemical reactions Flashcards
in a chemical reaction, are atoms created or destroyed?
Atoms are neither created or destroyed
What does change in a chemical reaction?
Bonds are broken and made and atoms rearrange (atoms are not created or destroyed)
What is mass?
mass is the amount of matter in an object
Does mass change chemical reactions?
The mass doesn’t change in a chemical reaction
Combustion is….
Combustion is burning in oxygen
What 3 things are needed for combustion?
oxygen, heat, fuel
Hydrocarbons are fuels containing only…
Hydrogen and carbon
Combustion is useful because…
heats stuff up, drive engines,
oxidation is…
the gain of oxygen
give 2 examples of oxidation
Combustion, rust
Thermal decomposition is
When a substance breaks down when heated
Where is energy transferred in exothermic reaction
when energy is transferred out
Where is energy transferred in endothermic
when energy is transferred in
What do catalyst do
speeds up a reaction
