Chemical Reactions and Energy Changes

Flashcards covering chemical reactions, energy changes, endothermic and exothermic processes, and chemical equations based on lecture material.

What is chemical potential energy?

It is defined as the potential energy stored in chemical bonds.

How is activation energy defined in a chemical reaction?

Activation energy is the energy added (absorbed) to break bonds of reactants.

What happens to chemical bonds during a chemical reaction?

A chemical reaction will either make or break bonds.

What does the direction of the arrow indicate in a chemical reaction diagram?

The direction of the arrow indicates a chemical reaction starting with reactant(s) and ending with product(s).

What symbol is used to indicate that a reaction is a reversible reaction?

A double arrow is used to show a reversible reaction.

What is the chemical reaction equation provided for the breakdown of water?

$$2H_2O \rightarrow O_2 + 2H_2$$

How many total carbon, hydrogen, and oxygen atoms are listed for the reaction$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ ?

$6$ Carbon atoms, $12$ Hydrogen atoms, and $18$ Oxygen atoms.

What happens to energy and heat in an exothermic reaction?

Heat is released (exothermic), causing energy to be released because the energy of reactants is higher than the energy of products.

What happens to energy and heat in an endothermic reaction?

Heat is absorbed (endothermic), causing energy to be absorbed because the energy of products is higher than the energy of reactants.

What notation is used in the reaction progress graph to represent the overall change in energy?

$$\text{(AH)}$$