Chemistry Past Questions and Answers

What is the molar mass of an alkyne with the formula C_x H ₁₄? (H = 1, C = 12)

(a) State two differences in the chemical properties of metals and non-metals.
(b) List two general methods of extract metals from their ores.

(1)(a) State Avogadro's law
(b) Which of the state of matter contains particles that are: (i) readily used
(ii) held firmly together by some forces of cohesion;
(iii) involved in rapid random motion?

A shortened form of the Periodic Table is shown below. Use it to answer questions (a) and (b)

(a) Which of the elements represented as A to E in the table, above is:
(i) transition metal;
(ii) an alkaline earth meta
(iii) the least reactive;
(iv) the most electronegative?

(b)(i) What type of bond would exist in a compound formed when element D reacts with oxygen?
(ii) Write the formula of the compound formed in (b)(i) above.

(a) Give one example each of a naturally occurring substance that;
(i) conforms to the general formula C(_x\)(H\(_2\)O)\(_y\);
(ii) contains the carboxyl group as its functional group.

(b) Name the process for obtaining: (i) paraffin oil from crude oil; (ii) benzene from ethyne.