A student performs a reaction twice. In the second trial, she raises the temperature by 20¨¬C and notices that the reaction take
2 answers:
Explanation:
An endothermic reaction is a reaction in which the reactants absorb energy and the energy of products is more than that of reactants.
Whereas an exothermic reaction is a reaction in which the reactants have more energy as compared to products. Hence, there will be release of energy.
Therefore, when temperature is increased by then it means we are providing more energy to the reactants. As a result, there will be release of energy. Hence, the reaction will be exothermic in nature and not endothermic.
Thus, we can conclude that the student is incorrect because the reaction is exothermic and not endothermic.
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Answer:
3.8 secs
Explanation:
Parameters given:
Acceleration due to gravity, g = 9.8
Initial velocity, u = 11.76 m/s
Final velocity, v = 49 m/s
Using one of Newton's equations of linear motion, we have that:
where t = time of flight of arrow
The sign is positive because the arrow is moving downward, in the same direction as gravitational force.
Therefore:
The arrow was in flight for 3.8 secs