Understanding Energy in Chemical Reactions

What is the source of energy in a chemical reaction according to the passage?

• Chemical bonds or the surrounding environment

• The Sun

• Electricity

• Nuclear reactions

What happens when chemical bonds break according to the passage?

• Energy is required

• Energy is released

• Nothing happens

• Atoms disappear

What is an endothermic reaction as described in the passage?

• A reaction that absorbs more energy than it releases

• A reaction that releases more energy than it absorbs

• A reaction that does not involve energy change

• A reaction that only occurs in plants

According to the passage, what is the role of concentration in chemical reactions?

• Higher concentration increases reaction rate

• Concentration has no effect

• Lower concentration increases reaction rate

• Concentration only affects physical reactions

What does the law of conservation of energy state as per the passage?

• Energy is not created or destroyed

• Energy is created during chemical reactions

• Energy is destroyed in exothermic reactions

• Energy is only conserved in living organisms