Correct Answer: A. observe imsak and make up

Explanation

(a) Hot Desert Climate

Location:Found within latitude 15°— 30°North and South of the Equator. It is mostly common in the Western side of continents. Examples are North Africa (Sahara desertss); Arabia (Arabian desert), Iran (Iranian desert); Southern Africa (Namib and Kalahari deserts); Australia (Great Australian desert); South America (Atacama desert). Hot desert can as well be located on plateaux such as Gobi, and Turkestan, Patagonia desert

Characteristics

(i) High temperature of about 50° — 77°C.

(ii) Annual range of temperature is about 11°C

(iii) It is rainless or arid Annual rainfall is low and less than 250mm

(v) High evaporation ratio due to high temperature

(vi) Relative humidity is low and about 30%

(vii) Mostly affected by the currents e.g Canary cold current affecting the Sahara desert.

(viii) Solar radiation and sunshine hours are high throughout the year.

(ix) Rainfall is convectional, hence sudden and violent

(x) Clear sky

(xi) Soil is sandy, rocky or stony

Vegetation

(1) The existence of sparse and scanty vegetation.

(2) Examples are grasses, shrubs and herbs

(3) Most plants are drought-resistant (Xerophytes)

(4) Example of plants are Acacia, Date palm, Cactus

Some plants are salt tolerant (Halophytes)

(6) Plants usually possess long root to tap water from the underground

(7) Some plants have thick succulent stems to conserve water

(8) Small, waxy, leathery, hairy / needle leaves to reduce transpiration.

Human Activity

(i) Food gathering, especially of fruits and nuts

(ii) Hunting for wild animals

(iii) Pastoral farming Crop cultivation particularly of grains with irrigation e.g millet, sorghum,

(v) Trading and mining also exist.

Correct Answer: D. live within their income

Correct Answer: C) Gay Lussac

Explanation

The given reaction is:

\(N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}\)

The ratio of reactants to products is 1: 3: 2, which means that one mole of nitrogen gas reacts with three moles of hydrogen gas to produce two moles of ammonia gas.

The law that is demonstrated by this reaction isGay Lussac's Law of Combining Volumes. This law states that when gases react together, they do so in volumes that bear a simple whole number ratio to one another, provided that the volumes are measured at the same temperature and pressure.

In this reaction, the volume of nitrogen gas, hydrogen gas, and ammonia gas are in the ratio of 1: 3: 2, which is a simple whole number ratio. Therefore, Gay Lussac's Law is demonstrated by this reaction.

Explanation

TSA = 224\(\pi\) cm\(^2\)

r : 1 = 2: 5

\(\frac{r}{l} = \frac{2}{5}\)

r = \(\frac{2l}{5}\)

\(\frac{3r}{2}\) = l

TSA \(\pi\)rl + \(\pi ^2\)

TSA = \(\pi\)(rl + r\(^2\))

224\(\pi\) = \(\pi\)r(l + r)

224 = r (\(\frac{5r}{2} + \frac{r}{1}\))

224 = r(\(\frac{5r + 2r}{2}\))

224 = \(\frac{7r^2}{2}\)

r\(^2\) = \(\frac{448}{7}\)

r = \(\sqrt{448}{7}\)

r = \(\sqrt{64cm}\)

l = \(\frac{5 \times 8}{2}\)

r = 8cm

l = 20cm

(b) Volume of cone = \(\frac{1}{3}\)\(\pi ^2\)h

h\(^2\) = l\(^2\) - r\(^2\)

h\(^2\) = (20)\(^2\) - (8)\(^2\)

h\(^2\) = 400 - 64

h = \(\sqrt{336}\)

= 18.33cm

Volume = \(\frac{1}{3} \times \frac{22}{7}\) x 8\(^2\) x 18.33

= \(\frac{25,809.06}{21}\)

= 1229 cm\(^3\)

Explanation

(a)(i) Particles of matter are in constant or continuous motion

(ii) The particles move randomly in straight lines and colliding with one another

(iii) The forces of attraction or repulsion are negligible

(b)(i) Diffusion (ii) Evaporation.

Correct Answer: C. Frequent intake of soft drinks

Correct Answer: D. p-block, period 3, group 3

Correct Answer: B. belittling

Correct Answer: (d) None of the above