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Which set of elements represents the major nutrients required by plants for healthy growth? Which property of water involves a chemical change? Which sequence best represents the stages in water treat

Chemistry

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Here are the answers to the multiple-choice questions:

Part 38

Which set of elements represents the major nutrients required by plants for healthy growth?

  • A. Nitrogen, phosphorus and potassium
    • These are the primary macronutrients (N-P-K) essential for plant growth.

Part 39

Which property of water involves a chemical change?

  • D. Reaction with sodium
    • Freezing, boiling, and evaporation are physical changes (changes of state). Reacting with sodium involves forming new substances (sodium hydroxide and hydrogen gas), which is a chemical change.

Part 40

Which sequence best represents the stages in water treatment?

  • A. Sedimentation →\rightarrow filtration →\rightarrow chlorination
    • This sequence represents the common steps: sedimentation to settle heavy particles, filtration to remove suspended solids, and chlorination for disinfection.

Part 41· 2 steps

Calculate the amount of substance in 20g of C6_6H12_{12}O6_6? [C=12 H=1 O=16]

  1. Calculate the molar mass of C6_6H12_{12}O6_6.

    Molar mass=(6×12)+(12×1)+(6×16)\text{Molar mass} = (6 \times 12) + (12 \times 1) + (6 \times 16) Molar mass=72+12+96\text{Molar mass} = 72 + 12 + 96 Molar mass=180 g/mol\text{Molar mass} = 180\, \text{g/mol}

  2. Calculate the amount of substance (moles).

    Moles=MassMolar mass\text{Moles} = \frac{\text{Mass}}{\text{Molar mass}} Moles=20 g180 g/mol\text{Moles} = \frac{20\, \text{g}}{180\, \text{g/mol}} Moles=19 mol≈0.1111 mol\text{Moles} = \frac{1}{9}\, \text{mol} \approx 0.1111\, \text{mol}
    • A. 0.11mol

Part 42

Which of the following practices cannot cause diseases in man?

  • B. Keeping good personal hygiene
    • Good personal hygiene helps prevent diseases, rather than causing them.

Part 43

Which of the following cannot be used to control pollution in Ghana?

  • B. Placing liquid and semi-liquid wastes in unlined pits
    • Placing wastes in unlined pits leads to soil and water contamination, thus causing pollution, not controlling it.

Part 44

Group VIII elements are ...

  • B. unreactive
    • Group VIII (or Group 18) elements are noble gases, which are known for their chemical inertness or unreactivity.

Part 45

One of the following cannot be used to control food poisoning?

  • B. Improper storage and temperature control
    • Improper storage and temperature control are causes of food poisoning, not methods to control it.

Part 46

Metals react with acid to liberate...

  • B. hydrogen gas
    • Reactive metals react with acids to produce a salt and hydrogen gas.

Part 47

All the following are symptoms of food poisoning except...

  • A. cough
    • Nausea, vomiting, and fever are common symptoms of food poisoning. A cough is typically a symptom of respiratory illness.

Part 48

Which one of the following does not bring about indigestion in man?

  • C. Eating enough roughage
    • Eating enough roughage (fiber) aids digestion and helps prevent indigestion. The other options can contribute to indigestion.

Part 49

Which of the following elements is a metal?

  • C. Magnesium
    • Chlorine, Oxygen, and Sulphur are non-metals. Magnesium is an alkaline earth metal.

Part 50

Which of the following is an example of group VII elements?

  • D. Chlorine
    • Group VII (or Group 17) elements are the halogens, which include Chlorine.
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