Energy Flow and Chemical Reactions

This tutorial explains how to represent chemical energy in three ways: using a balanced chemical equation, an energy diagram, and energy bar charts. It focuses on the decomposition of baking soda as an example of an endothermic reaction, where energy is absorbed from the surroundings. The tutorial also covers how energy bar charts can visualize energy changes, emphasizing the conservation of energy and the role of energy transfer in molecular rearrangement.

Which of the following is NOT a method to represent chemical energy?

• Balanced chemical equation

• Energy diagram

• Molecular weight calculation

• Energy bar chart

What type of reaction is the decomposition of baking soda?

• Endothermic

• Exothermic

• Neutralization

• Combustion

In an endothermic reaction, where is energy placed in the chemical equation?

• In the middle

• It is not included

• On the product side

• On the reactant side

What does an increase in the number of bars in an energy bar chart indicate?

• Decrease in chemical energy

• Increase in chemical energy

• Decrease in temperature

• Increase in pressure

How is thermal energy represented in an energy bar chart?

• By drawing fewer bars under ECH

• By drawing more bars under ETH

• By drawing more bars under ECH

• By drawing fewer bars under ETH

What must be shown to demonstrate the conservation of energy in a chemical reaction?

• Additional bars in the energy flow diagram

• Decrease in product energy

• Removal of bars from the energy flow diagram

• Increase in reactant energy

What does the letter 'Q' represent in the energy flow diagram?

• Heat transfer

• Quotient of energy

• Quality of products

• Quantity of reactants

What is necessary for the rearrangement of atoms during a chemical reaction?

• Low energy collisions

• Energetic collisions

• Stable temperature

• Constant pressure

How does heating affect the thermal energy of a system?

• Keeps it constant

• Increases it

• Decreases it

• Has no effect

What happens to thermal energy when it is transferred to chemical energy?

• It is destroyed

• It decreases

• It increases

• It remains the same