The fundamental difference between the three states of matter is the
- A. shape of their particles
- B. number of particles in each state
- C. shape of the container they occupy
- D. degree of movement of their particles
The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen?
- A. 0.203
- B. 0.579
- C. 2.030
- D. 5.790
The ratio of the initial to final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the initial volume was 300 cm3 at the same temperature
- A. 120 cm3
- B. 200 cm3
- C. 450 cm3
- D. 750 cm3
How many moles of HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?
- A. 14
- B. 12
- C. 11
- D. 10
50 cm3 of carbon (II) oxide was exploded with 150 cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
- A. Carbon (II) oxide
- B. Carbon (IV) oxide
- C. Oxygen
- D. Nitrogen
Which of the following compounds is composed of Al, Si, O and H?
- A. Epsom salt
- B. Limestone
- C. Clay
- D. Urea
Sieving is a technique used to separate mixture containing solid particles of
- A. small sizes
- B. large sizes
- C. different sizes
- D. the same sizes
A mixture of iodine and sulphur crystals can be separated by treatment with?
- A. Water to filter off sulphur
- B. carbon (IV) sulphide to filter off iodine
- C. ethanoic acid to filter off sulphur
- D. methanol to filter off iodine