A. the chemical balance operates on the principle of moments
B. the spring balance operates on Hooke’s law
C. either may be used to measure the weight of a substance
D. the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remains constant

Correct Answer: Option C

C. either may be used to measure the weight of a substance

SEE ALSO  A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]

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