General Chemistry 2 - Quiz

The energy required to start a chemical reaction is ___.

• endothermic

• exothermic

• activation

• released

Energy is _____ when new bonds form.

• absorbed

• released

• lost

• gained

Energy is ______ when bonds break.

• gained

• lost

• released

• absorbed

An _______ reaction is when more energy is released than is absorbed. This energy can be in the form of light, heat, electricity, etc.

• endothermic

• endergonic

• exothermic

• exergonic

An _______ reaction is when more energy is absorbed than is released. This energy can be in the form of light, heat, electricity, etc.

• endothermic

• endergonic

• exothermic

• exergonic

Scientists are looking into the decomposition of water (H₂O --> H₂ + H₂O) to make hydrogen fuel with the help of the Sun’s energy. What challenge do scientists face with this task?

• Decomposing water requires a high activation energy.

• The Sun isn't a renewable resource.

• Decomposing water results in toxic byproducts.

Which chemical reaction shows photosynthesis?

• carbon + oxygen → carbon dioxide

• water + carbon dioxide + sunlight → oxygen + glucose

• hydrogen + oxygen → water

Which of these reactions is a combustion reaction?

• production of food by plants with the help of the Sun's energy

• rotting of fruits and vegetables

• burning wood

In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction?

• Energy is absorbed in the reaction.

• Energy is released in the reaction.

• There is no transfer of energy in the reaction.

In a chemical reaction, activation energy increases the __________________________of the reactants.

• amount of chemical energy

• number of particles

• temperature