Read Particles and masses
This SOF ISO pattern tests match quantities. Read the condition carefully, then use the method below before you solve.
Chemistry questions first require the material, particles or reaction condition to be identified before a formula or rule is selected.
Separate the nucleus from the electron shell
Nucleus identifies the element · outer shell sets valency
Protons and neutrons are in the nucleus; electrons occupy shells. Atomic number identifies the element, while valency concerns outer-shell electrons.
Find the tested idea
Identify the material, change or observable property first; this decides the scientific rule to use.
Work from the evidence
Use the experiment or stated observation as evidence. Compare each option with the property, particle model or reaction condition in the stem.
Verify before choosing
Use the wording, diagram and units exactly as given. Select an option only after it satisfies every stated condition.
OlympIQ exam lens
- ✓State the observed property.
- ✓Select the governing idea.
- ✓Test every claim against the evidence.
Keep physical changes, chemical changes and everyday appearances separate.
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