Science: Chemical reactions Flashcards
1
Q
Combustion/burning needs what three reactants…?
A
Chemical fuel
Thermal energy
Oxygen
2
Q
What is the law of the conversation of mass?
A
Mass can never be created or destroyed it can only be changed in forms- much like energy.
3
Q
When it seems like an object has lost mass, what has actually happened?
A
The mass (as a gas) could be dissipated.
4
Q
What is the number that goes before a chemical symbol called when balancing equations?
A
Coefficient.
