Question 1
| Element | Percentage by mass / % |
|---|---|
| iron | 69.9 |
| oxygen | 30.1 |
The table gives the percentage composition by mass of an oxide of iron. What is its empirical formula?
IB Chemistry SL and HL.
The only interactive course with a tutor that finds your weak spots and fixes them.
Try a question
The course and its papers
Structure 1: Models of the particulate nature of matter
17 h SL, 21 h HL
Structure 2: Models of bonding and structure
20 h SL, 30 h HL
Structure 3: Classification of matter
16 h SL, 31 h HL
Reactivity 1: What drives chemical reactions?
12 h SL, 22 h HL
Reactivity 2: How much, how fast and how far?
21 h SL, 31 h HL
Reactivity 3: What are the mechanisms of chemical change?
24 h SL, 45 h HL
| Component | SL | HL | Weight |
|---|---|---|---|
| Paper 1 | 1.5 hours | 2 hours | 36% |
| Paper 2 | 1.5 hours | 2.5 hours | 44% |
| Scientific investigation | 10 hours | 10 hours | 20% |