Unit 5: Energy Exchange and Rate of Change

Front

What is energy exchange?

Back

Energy exchange refers to the transfer of energy from one system to another, which can occur in various forms such as heat, work, or mass transfer.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy to its surroundings, typically in the form of heat.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature of the surroundings decreases as the reaction absorbs heat.

Front

What happens to temperature during an exothermic reaction?

Back

The temperature of the surroundings increases as the reaction releases heat.

Front

How does increasing concentration affect particle collisions?

Back

Increasing concentration means there are more particles in the same space, leading to a higher frequency of collisions.

Front

What is the effect of temperature on the rate of a chemical reaction?

Back

Increasing the temperature generally increases the rate of a chemical reaction by providing more energy to the particles, resulting in more frequent and effective collisions.

Front

What is the relationship between collision frequency and reaction rate?

Back

Higher collision frequency typically leads to a higher reaction rate, as more particles are interacting with each other.

Front

What is a characteristic of an exothermic reaction?

Back

A characteristic of an exothermic reaction is that the products are often hot to the touch due to the release of energy.

Front

What is the role of activation energy in chemical reactions?

Back

Activation energy is the minimum energy required for a chemical reaction to occur; it determines the rate at which the reaction proceeds.