(a)(i) What is isomerism?

(ii) Name the alkanol that is isomeric with methoxymethane (CH\(_3\)OCH\(_3\)).

(b)(i) Outline the laboratory:preparation of ethylethanoate. (Diagrams not required)

(ii) Write the structural formula of ethylethancqte

(iii) State two physical properties of ethylethanoate.

(c) When gas oil which consists of larger hydrocarbons was subjected to high temperature and pressure, the following reaction occurred.

C\(_{17}\)H\(_{36(l)}\) \(\to\) 3C\(_2\)H\(_{4(g)}\) + C\(_3\)H\(_{6(g)}\) + Q\(_{(l)}\)

(i) What name is given to the process indicated above?

(ii) State the importance of the process to the petroleum industry.

(iii) Find the formula of the product which Q represents in the equation above.

(iv) Mention one type of chemical industry that utilizes ethene as raw material.

(d) Consider the following compounds: CH\(_3\) — (CH\(_2\))\(_2\) —CH\(_3\); C\(_6\)H\(_5\) —CH = CH\(_2\); CH=C — CH\(_3\). State which of them:

(i) is used as a domestic fuel;

(ii) is an aromatic compound,

(iii) participates in such situation but not addition reactions;

(iv) would react with two moles of hydrogen per mole.

Which element is placed at the top of the electrochemical

• A. Copper
• B. Hydrogen
• C. Sodium
• D. Oxygen

How many orbits are contained in an atom with atomic number 13?

• A. 7
• B. 6
• C. 5
• D. 3

There is a large temperature interval between the melting point and the boiling point of a metal because?

• A. metals have very high melting points
• B. metals conduct heat very repaidly
• C. melting does not break the metalic bond but boiling does
• D. the crystal lattice of metals is easily broken

What properties of duralumin make it more useful than its constituent metals?

• A. It is heavy with a high melting point
• B. It is malleable and has high density
• C. It is strong and light
• D. It is hard and ductile

Stainless steel is an alloy made up of

• A. Iron and zinc
• B. Copper and tin
• C. Iron and chromium
• D. Iron and carbon

Which of the following pairs of elements has the greatest difference in electronegativity?

• A. Na and F
• B. Na and CI
• C. Na and Br
• D. Na and I

The electronic configuration of an element is 1s₂2s₂2p₆3s₂3p₃. Where is the element located in the periodic table?

• A. Group lll, period 3
• B. Group lll, period 5
• C. Group V, period 3
• D. Group V, period 5

Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

• A. P
• B. Q
• C. R
• D. S

If the value of ΔH for a reaction is negative, it means that the reaction is

• A. slow
• B. exothermic
• C. spontaneous
• D. irreversible