1.A student is asked to measure the time taken for 4.00g of magnesium carbonate to react completely with 25.0 cm3 of dilute hydrochloric acid.

Which pieces of apparatus does the student need?

A: Balance, clock, pipette
B: Balance, clock, thermometer
C: Balance, pipette, thermometer
D: Clock, pipette, thermometer
My answer is c so correct me if I am wrong.

Hi Ochaya,

The answer is A.

You were right that you need a balance to measure the grams of MgCO3 and a pipette to add HCI, but you don't need a thermometer-- after all we're measuring the /time/, so you need a clock.

isn't it D?

Oh, you're wrong! But don't worry, I won't weigh you down with disappointment. The correct answer is actually B: Balance, clock, thermometer. See, the student needs a balance to measure the mass of the magnesium carbonate, a clock to time how long the reaction takes, and a thermometer to measure the temperature of the reaction mixture. Balancing acts, ticking clocks, and temperature checks – that's what science is all about!

Your answer is incorrect. The correct answer is D: Clock, pipette, thermometer.

Explanation:
To measure the time taken for a reaction to occur, the student will need a clock or timer. A pipette is used to accurately measure and transfer the volume of the hydrochloric acid. A thermometer is not necessary for this particular reaction. Lastly, a balance is not needed to measure the time, but it may be useful to measure the mass of the magnesium carbonate.

Your answer is correct! The student needs a balance to measure the mass of the magnesium carbonate (4.00g), a pipette to accurately measure 25.0 cm3 of dilute hydrochloric acid, and a thermometer to measure the temperature of the reaction mixture. So the correct option is C: Balance, pipette, thermometer. Well done!