Quantitative Chemistry Flashcards
1
Q
Is mass conserved in a chemical reaction?
A
Yes.
2
Q
the total mass of the reactants = total mass of the products
A
TRUE
3
Q
If a reaction produces gas, does the reactant lose mass?
A
No, however it may appear to lose mass.
4
Q
Relative formula mass?
A
Adding the Relative Atomic Masses (Ar) of each atom together.
5
Q
What is the relative formula mass of H2O? H = 1 O = 16
A
(2x1)+(1x16) = 18
6
Q
How to calculate Moles?
A
Moles = Mass (g) / Mr
7
Q
Equation for concentration?
A
concentration (g/dm3) = mass of solute (g) / volume of solvent (dm3)
8
Q
What is a limiting reactant?
A
A reactant that gets completely used up in a reaction, so limits the amount of product that is formed.
9
Q
What is an excess reactant?
A
A reactant that is not used up.
