Correct Answer: B. Christ came to call sinners

Correct Answer: D. ominous

Explanation

(a)(i) Sketch of Graphical Representation of Charles' Law: Volume (cm\(^3\))

(ii) Volume of O\(_{2(g)}\) required for complete combustion of 2.5 moles of ethanol at s.t.p.

C\(_{2}\)H\(_{5}\)OH\(_{(aq)}\) + 3O2\(_{2}\) -> 3H\(_{2}\)O + 2CO\(_{2(g)}\)

1 mole of ethanol = 3 x 22.4 dm\(^{2}\). of O\(_{2(g)}\)

.-. 2.5 moles of ethanol = 3 x 22.4 dm\(^{3}\) x 2.5

= 168.0 dm\(^{3}\).

(b)(i) Collision theory of reactants rates states that atoms/molecules/ions/particles/reactions involved in a chemical reaction must collide with effective collision before reaction can take place.

(ii) Using collision theory to explain effect of temperature on the rate of a chemical reaction: Increase in temperature makes the reacting molecules to gain kinetic energy and move faster. Where the temperature decreases, the reacting molecules lose kinetice energy and move slower. Frequency of collision and effective collision increase or decrease, therefore rate of reaction increases or decreases.

(c)(i) Esterification is the reaction between an alkanol and alkanoic acid to produce an Alkanoate (ester) and water in the presence of a mineral acid.

(ii) Two uses of alkanoates are: (1) Used in perfumes/cosmetics. (2) Used in artificial flavouring for foods. (3) Used in production of soap. (4) Used as plasticizers. (Any 2)

(iii) Products of the alkaline hydrolysis of ethyl ethanoate are: ethanol (C\(_{2}\)H\(_{5}\)OH) and sodium ethanoate (CH\(_{3}\)COONa) or potassium ethanoate CH\(_{3}\)COOK.

(d)(i) Tin-coated plate corrodes faster.

(ii) Zinc is more reactive than tin, higher in the electrochemical series than tin. When the tin coated plate is exposed, the plate goes into solution and corrodes. In zinc coated (galvanized) plate, it is zinc that dissolves and corrodes hence protecting the plate better and zinc coated plate does not corrode.

Correct Answer: B. wool

Explanation

The underlined vowel sound in 'put' is /?/ as in 'wool'. Therefore, the word that has the same vowel sound as the one represented by the underlined letter(s) in 'put' is 'wool'.

Correct Answer: B) Boyle's Law

Correct Answer: B. 5 : 3

Explanation

Heat lost = heat gained

m_H x c x (70 - 45) = m_c x c x (45 - 30)

\(\frac{m_c}{m_H}\) = \(\frac{5}{3}\)

Correct Answer: D. capital consumption

Correct Answer: B. mass movement

Correct Answer: B)

C\(_6\)H\(_5\)COOH + CaO \(\rightarrow\) C\(_6\)H\(_6\) + CaCO\(_3\)

Explanation

The correct reaction among the given options is:

Option B: C\(_6\)H\(_5\)COOH + CaO \(\rightarrow\) C\(_6\)H\(_6\) + CaCO\(_3\)

This reaction is an example of a reaction between an organic acid and a metal oxide. In this case, benzoic acid (C\(_6\)H\(_5\)COOH) reacts with calcium oxide (CaO) to form benzene (C\(_6\)H\(_6\) and calcium carbonate (CaCO\(_3\).

When an organic acid reacts with a metal oxide, the hydrogen (H) from the acid combines with the oxygen (O) from the metal oxide to form water (H\(_2\)O), and the remaining parts of the molecules combine to form a new compound. In this case, the hydrogen from benzoic acid and the oxygen from calcium oxide combine to form water, which then evaporates, leaving behind benzene and calcium carbonate.

It is important to note that the other options presented do not represent correct reactions, either because the products do not match the reactants or because the reactions do not follow the expected patterns for the given reactants.

Correct Answer: A. heal the sick