This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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You're on a roll — Here are the answers to questions 15-19: 15. Metals react with acid to liberate......... A. hydrogen gas Explanation: When reactive metals react with dilute acids, they displace hydrogen, producing a salt and hydrogen gas. For example, Mg(s) + 2HCl(aq) → MgCl_2(aq) + H_2(g). 16. One of the following cannot be used to control food poisoning? B. Improper storage and temperature control Explanation: Improper storage and temperature control allow harmful bacteria to grow rapidly in food, which is a primary cause of food poisoning. Therefore, it is a practice that leads to food poisoning, not one that controls it. 17. Group VIII elements are ......... C. unreactive Explanation: Group VIII elements (also known as Group 18 or noble gases) have a full outer electron shell, making them chemically stable and unreactive. 18. Which of the following cannot be used to control pollution in Ghana? C. Placing liquid and semi-liquid wastes in unlined pits Explanation: Placing wastes in unlined pits allows pollutants to seep into the soil and groundwater, causing severe environmental contamination. This practice actively contributes to pollution rather than controlling it. 19. Which of the following practices cannot cause diseases in man? B. Eating balanced meals Explanation: Eating balanced meals provides essential nutrients, strengthens the immune system, and promotes overall health, thereby preventing diseases rather than causing them. What's next?