Quantitative Chemistry Flashcards
0
Q
How can the empirical formula of a compound be calculated
A
From the masses or percentages of the elements in a compound
1
Q
How can a percentage of an element in a compound be calculated
A
From the relative mass of the element in the formula and the relative mass of the compound
2
Q
How can the masses of reactants and products be calculated
A
From balanced symbol equations
3
Q
Why is it not always possible to obtain the calculated amount of a product?
A
- the reaction may not go to completion because it is reversible
- some of the product may be lost when it is separated from the reaction mixture
- some of the reactants may react in different ways from the expected reaction
4
Q
What is the amount of a product obtained known as
A
The yield
5
Q
What is the percentage yield
A
When compared with the maximum theoretical amount as a percentage
6
Q
What are reversible reactions
A
In some chemical reactions the products of the reaction can react to produce the original reactants
