Correct Answer: D. A sound of 50 decibles in the air

Correct Answer: D. the yield of hydrogen iodide increases

Explanation

The given reaction is: H₂(g) + I₂(s) ------> 2HI(g)

The enthalpy change (ΔH) is negative, which means the forward reaction is exothermic. An exothermic reaction releases heat. We can represent heat as a product:

H₂(g) + I₂(s) ------> 2HI(g) + Heat

Le Chatelier's Principle states that if a change of condition is applied to a system in equilibrium, the system will shift in a direction that relieves the stress.

The stress applied here is a decrease in temperature.

To relieve the stress of decreased temperature, the system will try to produce more heat. Since the forward reaction produces heat (it's exothermic), the equilibrium will shift to the right (towards the products).

Let's evaluate the options based on this shift:

A. the gases condense: While decreasing temperature can lead to condensation, this is not the direct consequence of Le Chatelier's principle on the *yield* of the reaction. The primary effect is a shift in equilibrium. Also, it's not guaranteed that the temperature decrease will be sufficient for condensation of HI or H₂.

B. the yield of hydrogen increases: Hydrogen (H₂) is a reactant. If the equilibrium shifts to the right, H₂ is consumed to form more product. Therefore, the yield of hydrogen would decrease, not increase.

C. the concentration of the reactants remain constant: If the equilibrium shifts, the concentrations of reactants and products *change* until a new equilibrium is established. They will not remain constant.

D. the yield of hydrogen iodide increases: Hydrogen iodide (HI) is the product. Since the equilibrium shifts to the right (forward reaction), more HI is formed. Therefore, the yield of hydrogen iodide increases.

Thus, when the temperature of the reaction vessel is decreased, the yield of hydrogen iodide increases.

The final answer is D

Correct Answer: B. acceptable to Him

Correct Answer: A. boiling

Correct Answer: B) Proper sanitation

Explanation

People trooped out every Sabbath and other ceremonial days to all the worshipping centres, e.g. Bethel, Dan, Gilgal and Bersheba to worship God falsely. Amos found out that their actions amounted to lip service owing to multiplication of sins and trangressions. This attitude, Amos condemned totally. Amos also frowned at the worshippers' attitude that the places which were supposed to be sacred were turned to where they shared clothes, take people's pledges and also for cult prostitution with the main aim to profane the name of God.

Amos also saw that the solemn assembly of the people was pretentious. They did this in order to practice the heathen orgies from foreign nations. They danced to the music of these foreign gods under the camouflage that they were worshipping true God. They made free will offerings and paid their tithes. These items were those that they got from the poor and because of that, God pronounced that He would no longer accept their (false) assemblies. All the holy days were no longer kept holy.

The Sabbath, the festival of the new moon and other holy days were no longer meant for such. Instead. the days had been turned to time of acquiring wealth and oppressing the poor. It was the wish of the people that the days were increased, so that they could acquire more wealth. Because they had made contact with foreign religion, they could not but swear in the names of the heathen gods. The Lord would definitely punish them for this sinful act since God could no longer tolerate it.

Amos, considering the religious practices in Israel, made the following recommendations:

(i) They must come back to God in order to make national survival possible.

(ii) The people should do away with foreign religions and their practices which were not the ways of God.

(iii) The day of the Lord would be for them a day of gloom and darkness and not of glory if they failed to do the wishes of God.

Correct Answer: C. the kettle covered with soot cools down more quickly because it is a good radiator

Explanation

(a)(i) Abnormal demands: Are demand patterns which do not abide by the laws of demand and therefore give rise to the reverse of the basic laws of demand. At higher prices increased quantities are demanded.

(ii) Effective demand: is a desire backed by ability and willingness to pay for specific quantities of commodity at alternative prices and within a period of time.

(b)(i) Ostentatious goods:These are certain goods which have prestige value e.g jewelry. If the prices of these goods fall, less will be purchased and if their prices rise, more will be purchased.

(ii) If people expect price to rise in future, they will buy more but if they expect price to fall they will buy less.

(iii) Inferior goods: These are goods whose demand falls as income rises.

(iv) Perfectly elastic demand:A rise or fall in the price of the commodity will not affect the quantity demanded.

(v) Perfectly elastic demand: Price is constant and above this price nothing will be purchased.

(vi) Ignorance of the existence of substitutes.

(vii) Rare commodities or antiquities.

Correct Answer: D) Cooling water to obtain ice

Correct Answer: A. the demand for a king in Israel