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Explain law of constant proportion.
What is the ratio by mass of combining elements in H2O, CO2 and NH3?
Write down the formula for:
Copper nitrate, calcium sulphate and aluminium hydroxide.
Give the Latin name for sodium, potassium, gold and mercury.
What is polyatomic ton? Give one example.
What is meant by atomic mass, gram atomic mass of an element? Why is the mass have different expressions i.e., 'u' and 'g'?
Consider the compound calcium carbonate (CaCO3).
(a) Name the elements present in calcium carbonate.
(b) Calculate its formula unit mass. (Atomic masses: Ca = 40u, C = 12u, O = 16u)
(c) If a sample of calcium carbonate contains 6.022 × 1023 formula units, what would be its mass in grams?
What is formula unit mass? How is it different from molecular mass?
Define valency and give the valency for the following elements:
Give the atomicity of phosphorous and nitrogen.
What is atomic mass unit?