Hot & Cold Chemical Reactions

What happens during a chemical reaction?

• Reactants combine to form a new substance with different properties.

• Substances change their physical state but retain their original properties.

• Elements are rearranged without forming new substances.

• Energy is always absorbed, making the surroundings colder.

Which type of chemical reaction releases energy, making its surroundings feel hotter?

• Endothermic reaction

• Exothermic reaction

• Neutral reaction

• Physical reaction

What are the primary reactants in a typical heat pack that cause it to warm up?

• Ammonium chloride and water

• Iron and oxygen

• Calcium chloride and water

• Carbon and nitrogen

What happens to the temperature of the surroundings during an endothermic reaction, such as the one in a cold pack?

• It increases because energy is released.

• It decreases because energy is absorbed.

• It remains constant.

• It fluctuates randomly.

In an exothermic reaction, the temperature of the surroundings increases

• FALSE

• TRUE