REET · Mathematics and Science (Level 2)
Atoms, molecules, elements, compounds and mixtures.
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Q1 · Structure of Matter · EASY
A student dissolves salt in water and then heats the solution until all the water evaporates. What remains in the container is the salt. What does this observation tell us about the salt-water mixture?
Q2 · Structure of Matter · MEDIUM
Which one of the following correctly represents the relationship between atoms, molecules, and compounds? (i) Water (H2O) is made of molecules (ii) Each water molecule contains 2 hydrogen atoms and 1 oxygen atom (iii) Water is a compound (iv) Oxygen gas (O2) is a compound
Q3 · Structure of Matter · HARD
A teacher demonstrates three samples to students: Sample P: Can be separated into iron and sulfur using a magnet Sample Q: Has properties completely different from iron and sulfur, cannot be separated by magnet Sample R: When heated strongly in absence of air, it breaks down to give back iron and sulfur Based on the structure of matter, which classification is correct?