Chemistry Past Questions and Answers

Which of the following is a measure of the average kinetic energy of the molecules of a substance?

A Volume
B Mass
C Pressure from age grades
D Temperature

Question 7:

If 100 cm³ of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?
(O = 16, H = 1)

A 10.0 s
B 12.5 s
C 17.7 s
D 32.0 s

Question 8:

An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?

A Number of molecules of the gas
B Density of the gas molecules
C Number of collisions between the gas molecules
D Number of collisions between the gas molecules and the walls of the container

Question 9:

The nucleus of the isotope tritium, contains?

A Two neutrons with no protons
B One neutron and one protons
C Two neutrons and one proton
D Two neutrons, one proton and one electron

Question 10:

How many lone pairs of electron are there on the central atom of the H₂O molecules?