Endothermic & Exothermic Reactions

Front

If a chemical reaction is EXOTHERMIC, the temperature would...

Back

Increase

Answer explanation

In an exothermic reaction, energy is released in the form of heat, causing the temperature of the surroundings to increase. Therefore, the correct answer is that the temperature would increase.

Front

During an endothermic reaction in a beaker, if we are part of the surroundings and touched the beaker, it would feel _______.

Back

Cold

Answer explanation

During an endothermic reaction, the system absorbs heat from the surroundings. When you touch the beaker, it feels cold because heat is being drawn from your hand, making the beaker feel cooler.

Front

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 °C. The temperature after the reaction was 18 °C. Which of the following is true?

Back

It is an endothermic reaction

Answer explanation

The temperature decreased from 25 °C to 18 °C, indicating that the reaction absorbed heat from the surroundings. This is characteristic of an endothermic reaction, where energy is taken in, leading to a drop in temperature.

Front

Baking bread and cooking an egg are examples of...?

Back

Endothermic processes

Answer explanation

Baking bread and cooking an egg are endothermic processes because they require heat absorption from the environment to occur. This distinguishes them from exothermic processes, which release heat.

Front

What type of reaction is shown in the photo?

Back

Exothermic

Answer explanation

The reaction is exothermic because it releases energy in the form of heat, resulting in an increase in temperature. This is characteristic of exothermic reactions, distinguishing them from endothermic and isothermic reactions.

Front

Is photosynthesis an Exothermic or an Endothermic reaction?

Back

Endothermic

Answer explanation

Photosynthesis is an endothermic reaction because it absorbs energy from sunlight to convert carbon dioxide and water into glucose and oxygen, thus requiring energy input.

Front

What type of reaction occurs in a hand warmer?

Back

exothermic

Answer explanation

A hand warmer operates through an exothermic reaction, which releases heat. This process occurs when chemicals inside the warmer react, generating warmth that is felt externally.

Front

Why do sherbet sweets candy fizz in your mouth and make your tongue feel cold?

Back

It is an endothermic reaction

Answer explanation

Sherbet sweets contain acids and bicarbonates that react when they dissolve in saliva, absorbing heat from your mouth. This endothermic reaction cools your tongue, causing the fizzy sensation and cold feeling.

Front

Back

exothermic

Answer explanation

The reaction of oxygen and hydrogen to form water releases energy, indicating it is exothermic. In exothermic reactions, energy is released to the surroundings, which is the case here.

Front

Back

endothermic reaction

Answer explanation

The reaction shows that carbon dioxide and water, along with energy, produce glucose and oxygen. Since energy is absorbed for the reaction to occur, it is classified as an endothermic reaction.