Exothermic and Endothermic Reactions

What is the general equation for an exothermic reaction?

• Reactants + Energy → Products

• Reactants → Products + Energy

• Reactants → Energy + Products

• Energy + Reactants → Products

What happens to temperature in an endothermic reaction?

• The temperature of the surroundings decreases.

• The temperature of the surroundings increases.

• The temperature remains constant.

• The temperature fluctuates randomly.

What role does energy play in chemical reactions?

• Energy is always released during chemical reactions.

• Energy has no effect on chemical reactions.

• Energy is either absorbed or released during chemical reactions, determining if they are endothermic or exothermic.

• Energy only affects the speed of chemical reactions.

In an exothermic reaction, heat is...

• absorbed

• given out

• neutralized

• converted into light

What is the significance of energy changes in chemical reactions?

• They determine the color of the substances involved.

• They help predict the behavior of reactions and their feasibility.

• They indicate the temperature of the reaction.

• They have no impact on the reaction process.

In an endothermic reaction, heat is...

• released

• taken in.

• transferred out

• absorbed by the surroundings

What is the general equation for an endothermic reaction?

• Reactants + Energy → Products.

• Reactants → Products + Energy

• Energy + Products → Reactants

• Products → Reactants + Energy

What is an example of an exothermic reaction?

• Burning of fuels, such as wood or gasoline.

• Photosynthesis in plants.

• Dissolving salt in water.

• Melting of ice.

How can you identify an exothermic reaction experimentally?

• By measuring a decrease in temperature during the reaction.

• By measuring an increase in temperature during the reaction.

• By observing a color change in the reactants.

• By measuring the pressure change in the reaction vessel.

What is an example of an endothermic reaction?

• Photosynthesis, where plants absorb sunlight.

• Combustion of gasoline, releasing heat.

• Respiration, where glucose is broken down.

• Freezing of water, releasing heat.