Shane performed the following trials in an experiment.
1 answer:
The heat transfer (Q) is given by mass, specific heat, and the change in the temperature. The heat absorbed in both trials is the same as Q is the same for both. Thus, option a is accurate.
<h3>What is heat transfer?</h3>Heat transfer is the gain and loss of heat by the system. It is given as the product of the mass, specific heat, and the change in the temperature. Heat transfer is shown as,
Q for trial 1 is calculated as:
Q = 30 * 4.18 * 40
= 5016 J
Q for trial 2 is calculated as:
Q = 40 * 4.18 * 30
= 5016 J
Therefore, the heat absorbed is the same for both as the heat transfer (Q) is the same in both trials.
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Answer : The reaction is endothermic.
Explanation :
Formula used :
where,
= change in temperature =
Q = heat involved in the dissolution of KCl = ?
m = mass = 0.500 + 50.0 = 50.5 g
c = specific heat of resulting solution =
Now put all the given value in the above formula, we get:
The heat involved in the dissolution of KCl is positive that means as the change in temperature decreases then the reaction is endothermic and as the change in temperature increases then the reaction is exothermic.
Hence, the reaction is endothermic.