Correct Answer: D. During the war between Israel and AmaleK

Correct Answer: B. synecdoche

Correct Answer: B. dormitory

Correct Answer: D) Carboxylic acid

Explanation

In this chemical equation, you can see two compounds reacting with each other:

1. CH\(_3\)CO\(_2\)H: This is acetic acid, which has a carboxyl group (-COOH) attached to a methyl group (CH\(_3\). The carboxyl group is the functional group responsible for its acidic properties.

2. CH\(_3\)CH\(_2\)OH: This is ethanol, which has a hydroxyl group (-OH) attached to an ethyl group (CH\(_3\)CH\(_2\). The hydroxyl group is the functional group responsible for its alcohol properties.

When these two compounds react, they form an ester. The functional group present and relevant in this reaction is the carboxyl group, as it is present in the acetic acid and is responsible for the formation of the ester.

Thus, the correct answer isOption D: Carboxylic acid.

Correct Answer: A. they had not yet received power

Correct Answer: A. Frost action

Explanation

Chemical weathering involves the process of rock decomposition due to chemical reactions. The processes include carbonation, hydrolysis, and oxidation. Frost action, on the other hand, is a form of physical weathering where water seeps into cracks in rocks, freezes, and expands, causing the rock to break apart. Therefore, frost action is not a process of chemical weathering.

Correct Answer: A. 1\(\frac{1}{2}\)

Explanation

If x : y : z = 3 : 3 : 4, evaluate \(\frac{9x + 3y}{6x - 2y}\)

\(\frac{x}{y}\) = \(\frac{2}{3}\) and \(\frac{y}{z}\) = \(\frac{3}{4}\)

Thus; x = \(\frac{2}{3}T_1\) and z = \(\frac{3}{5}T_1\)

y = \(\frac{3}{7}T_2\) and z = \(\frac{4}{7}T_2\)

Using y = y

\(\frac{3}{5}T_1\) = \(\frac{3}{7}T_2\); \(\frac{T_1}{T_2}\) = \(\frac{3}{7}\) x \(\frac{5}{3}\)

\(\frac{T_1}{T_2}\) = \(\frac{15}{21}\)

\(T_1\) = 15 and \(T_2\) = 21

Therefore;

x = \(\frac{2}{5}\) x 15 = 6

y = \(\frac{3}{5}\) x 15 = 9

y = \(\frac{3}{7}\) x 21 = 9 (again)

z = \(\frac{4}{7}\) x 21 = 12

Hence;

\(\frac{9x + 3y}{6z - 2y}\) = \(\frac{9(6) + 3(9)}{6(12) - 2(9)}\)

\(\frac{54 + 27}{72 - 18}\) = \(\frac{81}{54}\) = \(\frac{3}{2}\)

= 1\(\frac{1}{2}\)

Correct Answer: A. So far as

Correct Answer: C. \(3\log_{3} 2\)

Explanation

\(2\log_{3} 8 - 3\log_{3} 2 = \log_{3} 8^{2} - \log_{3} 2^{3}\)

= \(\log_{3}(\frac{64}{8}) \)

= \(\log_{3} 8 = \log_{3} 2^{3}\)

= \(3 \log_{3} 2\)

Explanation

(a) Fission: Nuclear reaction in which a heavy nucleus is bombarded with neutrons and split into approximate equal parts emitting neutrons and releasing large amounts of energy.

Fusion: Nuclear reaction between two light nuclei forming a heavier nucleus with the release of a large amount of energy.

(b) Advantages of Fusion over Fission:

(1)By - products are non-radioactive. (2) Easily achieved with lightest elements so that nuclear repulsion is easily overcome as nuclei approach each other. (3) Raw materials are cheaply available.

Why fusion is not normally used : Very high temperature is required to overcome coulomb repulsive forces between the two light nuclei. It is difficult to get materials that will withstand such high temperature. Mathematically,

\(T^{\frac{1}{2}} = \frac{0.693}{\lambda}\), where \(\lambda\) is the decay constant.

Decay constant = \(\frac{\text{no of atoms disintegrating per sec}}{\text{no of atoms in the source at that instant}}\)

Isotopes: Isotopes of an element are atoms which have the same proton numbers/atoms number but different nucleon numbers/mass number.

Decay scheme: \(^{238} _{92} U \to ^{234} _{90} Th + ^{4} _{2} He + Energy\)

\(^{234} _{90} Th \to ^{234} _{91} Pa + ^{0} _{-1} e + Energy\)

\(^{234} _{91} \to ^{0} _{-1} e + ^{234} _{92} + Energy\)

(d) Uses of radioisotopes:

(1) Radio therapy (2) Radio dating (3) Used as tracers and preservatives in agriculture.