Correct Answer: A)

\(Mg_{(s)}/Mg^{2+}_{(aq)} || Cu^{2+}_{(aq)}/Cu_{(s)}\)

Explanation

In an electrochemical cell, there are two half-cells: the anode and the cathode. The anode is the site of oxidation (loss of electrons) and the cathode is the site of reduction (gain of electrons). In this case, the overall reaction is:

\(Mg_{(s)} + Cu^{2+}_{(aq)} \rightarrow Mg^{2+}_{(aq)} + Cu_{(s)}\)

To identify the anode and cathode, we need to look at the oxidation and reduction processes happening in the reaction:

Oxidation: \(Mg_{(s)} \rightarrow Mg^{2+}_{(aq)} + 2e^-\) (Anode)

Reduction: \(Cu^{2+}_{(aq)} + 2e^- \rightarrow Cu_{(s)}\) (Cathode)

In a symbolic representation of an electrochemical cell, the anode (oxidation) is placed on the left side and the cathode (reduction) is placed on the right side. The half-cells are separated by a double vertical line (||) which represents the salt bridge that allows the flow of ions between the two half-cells. The solid (s) and aqueous (aq) species are separated by a single vertical line (/).

So the correct symbolic representation of the cell is:

Mg(s)/Mg²⁺_(aq) || Cu²⁺_(aq)/Cu(s) (Option A)

Correct Answer: A. God's guidance and protection over His people

Correct Answer: D. can be converted into thin sheets

Correct Answer: C. 4.0 x 10³N

Explanation

(a) Stress = \(\frac{Force}{Area} = \frac{50}{3.142(1 \times 10^{-3})^2}\)

(b) Strain = \(\frac{extension}{length} = \frac{2.5 \times 10^{-5}}{5}\)

= 5 x 10\(^{-5}\)

Correct Answer: C. chicken

Correct Answer: C) Coniferous forest

Explanation

In West Africa, there are different types of biomes, which are large areas with distinct plants, animals and climate. One of the options listed is not a major biome in West Africa. The options are Rain forest, Savanna, Coniferous forest, and Mangrove. Rainforest is a dense forest with high rainfall and diverse species of plants and animals. Savanna is a grassland with scattered trees and shrubs, and it is known for its large herds of grazing animals. Coniferous forest is a type of forest dominated by cone-bearing trees that are adapted to cold and dry conditions. Mangrove is a type of forest that grows in saltwater areas near the coast. Out of the options listed, Coniferous forest is not a major biome in West Africa. This is because Coniferous forests are typically found in colder regions with low rainfall, and West Africa is known for its warm and humid climate. It is important to understand the different types of biomes as they affect the distribution of plant and animal species. For example, the types of plants and animals found in a rainforest are different from those found in a savanna. This is due to the distinct climate and soil conditions in each biome.

Correct Answer: D. 3 - chloro - 2, 4 - dimethylhexane

Explanation

- Recognise the functional group in the compound. This will determine the suffix of the name

- Find the longest continuous carbon chain that contains the functional group (it won't always be a straight chain) and count the number of carbon atoms in this chain. This number will determine the prefix (the beginning) of the compound's name

- Number the carbons in the longest carbon chain (Important: If the molecule is not an alkane (i.e. has a functional group) you need to start numbering so that the functional group is on the carbon with the lowest possible number). Start with the carbon at the end closest to the functional group.

- Look for any branched groups: Name them by counting the number of carbon atoms in the branched group and referring to Table 4.6, these groups will all end in -yl. Note the position of the group on the main carbon chain. If there is more than one of the same type of branched group then both numbers must be listed (e.g. 2,4 -) and one of the prefixes listed in Table 4.7 must be used. Important: If the molecule is an alkane the branched group must be on the carbon with the lowest possible number. The branched groups must be listed before the name of the main chain in alphabetical order (ignoring di/tri/tetra). If there are no branched groups this step can be ignored.

- For the alkyl halides the halogen atom is treated in much the same way as branched groups: To name them take the name of the halogen atom (e.g. iodine) and replace the -ine with -o (e.g. iodo) Give the halogen atom a number to show its position on the carbon chain. If there is more than one halogen atom the numbers should be listed and a prefix should be used (e.g. 3,4-diiodo- or 1,2,2-trichloro-). See Table 4.7 for a list of the prefixes. The halogen atoms must be listed before the name of the main chain in alphabetical order (ignore di/tri/tetra). If there are no halogen atoms this step can be ignored. - Combine the elements of the name into a single word in the following order: branched groups/halogen atoms in alphabetical order (ignoring prefixes) prefix of main chain name ending according to the functional group and its position on the longest carbon chain

Correct Answer: A. Law and the prophets

Correct Answer: D. breeding of plant and animals