Exothermic and Endothermic Reactions Quiz Cognito

What is the main difference between exothermic and endothermic reactions?

• Exothermic reactions release energy, while endothermic reactions absorb energy.

• Exothermic reactions absorb energy, while endothermic reactions release energy.

• Both exothermic and endothermic reactions release energy.

• Both exothermic and endothermic reactions absorb energy.

In a reaction profile, what does the y-axis represent?

• The activation energy

• The progress of the reaction

• The total energy of the molecules

• The temperature of the surroundings

What is the most common type of exothermic reaction?

• Combustion reactions

• Neutralization reactions

• Decomposition reactions

• Oxidation reactions

Which of the following is an example of an endothermic reaction?

• Breaking down calcium carbonate into calcium oxide and carbon dioxide

• Neutralization of an acid and a base

• Combustion of methane

• Oxidation of metals

What is activation energy?

• The minimum amount of energy required for reactant particles to collide and react

• The energy absorbed during a reaction

• The energy released during a reaction

• The total energy of the products

In a reaction profile, where are the reactants placed?

• At the bottom

• At the top

• On the left

• On the right

How can we measure the increase in temperature during an exothermic reaction?

• By using a thermometer in a sealed container

• By observing the color change

• By measuring the mass of the reactants

• By using a thermometer in an open container

What happens to the energy in the products compared to the reactants in an exothermic reaction?

• The energy of the products is not important

• The products have less energy than the reactants

• The products have the same energy as the reactants

• The products have more energy than the reactants

What is the most common way to exchange energy with the surroundings in a chemical reaction?

• In the form of electricity

• In the form of light

• In the form of heat

• In the form of sound

How can we show higher activation energies in reaction profiles?

• By making the curves narrower

• By making the curves go lower

• By making the curves go higher

• By making the curves wider