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The importance of sodium aluminate (III) in the treatment of water is to
cause coagulation
prevent goitre and tooth decay
neutralize acidity
kill germs
From the diagram above, find the amount of solute deposited when 200 cm3 of the solution is cooled from 55 °C to 40 °C.
0.01 mol
0.02 mol
0.10 mol
0.20 mol
The arrangement of particles in crystal lattices can be studied using
β-rays
X‑rays
α-rays
γ-rays
The molecular lattice of iodine is held together by
van der Waals forces
hydrogen bonds
dative bonds
metallic bonds
An isotope has atomic number 15 and mass number 31. The number of protons it contains is
16
31
46
15
