(a) The temperature goes up by 3⁰C.
(b) There is increase in temperature, so the reaction is exothermic.
(c) Examples of exothermic reaction include, rusting of Iron, burning of coal, reaction of strong acid and water.
(d) Examples of endothermic reaction include, melting solid salts and evaporating liquid water.
What is exothermic reaction?
Exothermic reaction is a type of chemical reaction in which energy is transferred to or from the surroundings.
Examples of exothermic reactions include the following;
- Rusting of Iron
- Burning of Coal
- Reaction of Strong Acid and Water
- Water and Calcium Chloride
What is endothermic reaction?
Endothermic reaction is a type of chemical reaction in which energy is absorbed from the surroundings.
Examples of endothermic reactions include the following;
- Melting solid salts.
- Evaporating liquid water, etc
Change in temperature
From the increase in temperature from 15⁰C to 23⁰C, we can conclude that the temperature goes up by 3⁰C.
20⁰C - 17⁰C = 23⁰ - 20⁰C = 3⁰C.
Since there is increase in temperature, the reaction is exothermic.
Learn more about exothermic reaction here: https://brainly.com/question/2924714
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