Question 10(Multiple Choice Worth 1 points)
[CM.02] A student designed an experiment to show how water is recycled through the atmosphere. The steps of the experiment are shown below.
. Boil 500 mL of water in a beaker.
• Hold a hot glass plate a few inches above the beaker with a pair of tongs.
. Observe water droplets on the glass plate.
The student did not see water dripping off the glass plate as expected because the experiment had a flaw. Which of these statements best describes a
method to correct the flaw in this experiment?
Hold the glass plate closer to the beaker.
O Boil the water in a pan instead of a beaker.
Take more than 500 mL of water in the beaker,
O Use a cold glass plate instead of a hot glass plate.
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Ответ:
Answer : The correct option is, (D) Combination
Explanation :
Double replacement reaction : A chemical reaction in which a positive cation and a negative anion of the two reactants exchange places to give two new products or compounds.The general representation of this reaction is,
(A and C are the cations, B and D are the anions)
Substitution reaction : A chemical reaction in which a more reactive element displaces the least reactive element.The general representation of this reaction is,
The general representation of this reaction is,
The general representation of this reaction is,
Hence, the correct option is, (D) Combination