Chemical Reactions Flashcards
What is the conservation of mass
- the total mass of chemicals will be the same before and after the reaction
What is thermal decomposition
When a compound breaks down when heated
What is combustion
When a fuel is burned to release energy
What are for needed for combustion
- fuel
- heat
- oxygen
- if one of these goes out the fire will go out
What is the equation for complete combustion
Fuel + oxygen ——> carbon dioxide + water
What is complete combustion
Complete combustion occurs when there is a good supply of oxygen
What is incomplete combustion
Occurs when these is poor supply of oxygen
What is the equation of incomplete combustion
Fuel + oxygen ——> carbon dioxide + water + soot (carbon)
What is oxidation
- When a substances gains oxygen atoms
- e.g iron + oxygen —> iron oxide
What is reduction
- takes away oxygen
Magnesium oxide —> magnesium + oxygen
what is the independent variable
the thing you are going to change each time in a experiment
what is the dependent variable
the thing you are measuring in the experiment
what is the controlled variable?
the thing you are controlling in the experiment
