Substance A and substance B were dissolved in two separate 100 mL beakers of water, which each started at a temperature of 25.1°C. The mixtures' temperatures were measured and recorded as shown in the table below. Substance Initial Temp. Final Temp. A 25.1°C 30.2°C B 25.1°C 20.0°C Which statement is a correct interpretation of the data?

A. The dissolving of substance A released heat and the dissolving of substance B absorbed heat. B. The dissolving of substance B released heat and the dissolving of substances A absorbed heat. C. Only the dissolving of substance A absorbed heat. D. Only the dissolving of substance B released heat.

Question

03-10-2018
Chemistry

contestada

Substance A and substance B were dissolved in two separate 100 mL beakers of water, which each started at a temperature of 25.1°C. The mixtures' temperatures were measured and recorded as shown in the table below. Substance Initial Temp. Final Temp. A 25.1°C 30.2°C B 25.1°C 20.0°C Which statement is a correct interpretation of the data?

A. The dissolving of substance A released heat and the dissolving of substance B absorbed heat. B. The dissolving of substance B released heat and the dissolving of substances A absorbed heat. C. Only the dissolving of substance A absorbed heat. D. Only the dissolving of substance B released heat.

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thelaughingpumouop2e thelaughingpumouop2e · Answer 1 · 2019-02-28T03:08:29+01:00

The correct option is D.

The dissolving of substance A released heat and the dissolving of substance B absorbed heat.

Study Island explanation:

When reactions release heat, the temperature increases. When reactions absorb heat, the temperature decreases.

The temperature of substance A increased (heat was released) while the temperature of substance B decreased (heat was absorbed). So the dissolving of substance A released heat and the dissolving of substance B absorbed heat.

nikitarahangdaleVT nikitarahangdaleVT · Answer 2 · 2022-03-19T10:49:41+01:00

The dissolving of substance A released heat and the dissolving of substance B absorbed heat is the correct interpretation of given data.

What are exothermic and endothermic reaction?

Those chemical reaction which emits heat after the completion of reaction is known as exothermic reaction and those reaction which absorbs heat is known as endothermic reaction.

According to the given data, after completion of reaction temperature increases from 25.1°C to 30.2°C as substance A emits heat. And substance B may absorb the heat as the temperature of the reaction falls from 25.1°C to 20.0°C.

Hence option (A) is correct.

To know more about exothermic & endothermic reaction, visit the below link:

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