C3 Flashcards
1
Q
Reactant
A
Substances present at the start of a reaction
2
Q
Product
A
substances formed in a chemical reaction
3
Q
Conservation of Mass
A
Atoms cannot be created or destriyed. The mass of reactnats is equal to the mass of products
4
Q
Thermal decomposition
A
Type of reaction in which a compound breaks down to form two or more substances when it is heated
5
Q
When a metal forms a metal oxide, why does the mass increase
A
Because oxygen has been added
6
Q
When an acid reacts with a metal, why does the mass decrease
A
Because a gas is produces and escapes
