Correct Answer: C. DNA analysis

Correct Answer: C. Wages and Salaries

Correct Answer: C. 2 - methyl pentane

Correct Answer: D) Assets = Liabilities - Owner

Explanation

(a) Selling price = \(\frac{90 \times 5600}{100}\) = $5,040.00. Thereafter, to obtain the amount invested = 5,040 - 1310 = $3,730.00

The interest amount invested is \(\frac{3730 \times 6 \times 3}{100}\) = $671.40

(b) 2\(^x\)(2\(^{-14}\)) = 2. This will be simplified and solved for x to get x = 15.

Similarly, 3\(^{-x}\)(3\(^{4y}\)) = 3 and this will yield -x + 4y = 1.

Substituting for x and solving for y yielded y = 4.

Explanation

2(a) How agricultural production is affected by (i) Agricultural education and extension:

- Improved/better farm management decision making
- Improved procurement of farm inputs

- Access to marketing information and strategy

- Keeping of accurate farm records

- Acquisition of loans and their utilization

- Improve the farmers social disposition Help the farmers to understand and adopt modern farming techniques for improved productivity

- Agricultural education motivates the youths to take up farming as a profession

- Relay farmers' problems to the government ministries, research institutes and universities.

-Carry information from government ministries, universities and research institutes to farmers.

(ii) Environmental degradation:

- Desert encroachment exposes the soil to erosion

- Erosion renders the soil unproductive and unsuitable for agriculture

- Oil spillage pollutes the fishing and drinking water and kills all the aquatic life, thus reducing the profit of the fishermen

- Drinking water for the farm family and their animals is polluted; thus exposing them to health risks

- Air pollution by toxic fumes from industrial gases reduces the quality of air available to the farm family and their animals

- Acid rains from air pollution cause soil acidity and destruction of crops

- Deforestation exposes the soil to erosion agents

- Overgrazing causes erosion and hard pans Bush burning damages the physical structure of the soil and reduces soil fertility

- Air pollution reduces photosynthesis and thus reduces yield Plant population for livestock consumption is reduced

(b) Problems associated with communal land tenure system:

- Land cannot be pledged, sold or used as collateral by an individual

- Those with means, but who are not members of the community, find it difficult to get land for farming activities/non-indigenes of the community cannot acquire land or have access to it

- There is tendency to neglect parcels of useful land as no one readily considers it his/her interest to protect it from degradation.

- It is characterized by litigations and mis-understanding Mechanized farming cannot be practised without permission of the whole community.

- There is excessive land fragmentation over time - Allotted land can be revoked by new leadership

- It does not encourage planting of permanent crops.

(c) Components of an Incubator:

Setter/Egg tray

- Hatcher

- Thermostat

- Turner

- Felt tray

- Heat source

- Vent/fan/air circulation unit

- Hygrometer

- Alarms

- Insulators

- Control unit

- Thermometer.

(d) Storage structures for farm produce: (i) Yam tubers: Yam barn (ii) Cowpea Seeds: Silo - Rhumbus (iii) Fresh fish: Cold room/freezer.

Explanation

(a)(i) Water is a universal solvent because it can dissolve many substances. water is polar and as a result, it can dissolve ionic solutes as well as partially ionic/polar covalent substances

(ii) Add water to anhydrous copper

(II) tetraoxosulphate (VI) salt, colour changes from white to blue. OR Add water to anhydrous cobalt

(II) ch!oric!e, colour changes from blue to pink.

(b)(i) I. OH\(^-{_(aq)}\) \(\to\) 2H\(_2\)O\(^-{_(l)}\) + O\(_{2(g)}\) + 4e\(^-\)

II. 2H\(^+_{(aq)}\) + 2e\(^-\) --> H\(_{2(g)}\)

OR 4H\(^+_{(aq)}\) + 4e\(^-\) --> 2H\(_{2(g)}\)

Ill. 2H\(_2\)O\(_{(l)}\) -> OH\(_{2(g)}\) + O\(_{2(g)}\)

OR 4OH\(^-_{(aq)}\) + 4H\(^+_{(g)}\) --> 2H\(_2\)O\(_{(l)}\) + 2H\(_{2(g)}\) + O\(_{2(g)}\)

(ii) Quantity of electricity = 1 x t = 1.25 x 40 x 60 = 3000C

For 1 mole of O\(_2\) formed at the anode, 4e\(^-\) are generated Volume of O\(_2\) formed by 3000C = \(\frac{3000}{96500}\) x \(\frac{1}{4}\) mole O\(_2\)

= 7.77 x 10\(^{-3}\) moles

1 mole O\(_2\) occupies 22.4 dm\(^{3}\) at s.t.p. mole of O\(_2\) = 7.77 x 10\(^{-3}\) x 22.4 dm\(^{3}\) = 0.174dm\(^{3}\)/174 cm\(^{3}\)

OR From the equation at anode; 4 x 96500C = 22.4 dm\(^{3}\)

3000C = \(\frac{22.4 \times 3000}{4 \times 96500}\)

= 0.174dm\(^{3}\) / 174 cm\(^{3}\)

(c)(i) 2Au\(_{(s)}\) + 3Cl\(_{2(g)}\) \(\to\) 2AuCI\(_{3(s)}\)

(ii) Amount of Au= \(\frac{1.2}{197}\) = 0.00634 mole

Amount of Cl\(_2\) = \(\frac{1.744}{71}\) = 0.0246 mole.

From equation: 2 moles of Au = 3 moles of Cl\(_{(2)}\)

.-. 0.00634 mole of Au = \(\frac{0.00634 \times 3}{2}\) = 0.00951 mole

Amount of CI\(_2\) available = 0.0246 mole but amount required by all the Au for the reaction = 0.00951

CI\(_2\) is in excess.

(iii) Excess amount of CI\(_2\) = amount available - amount used = 0.0246 - 0.00951 = 0.015 mole.

Correct Answer: A. 1

Correct Answer: B. his invention

Correct Answer: C. premium