Front

What is bond energy?

Back

Bond energy is the amount of energy required to break one mole of a bond in a molecule, measured in kilojoules per mole (kJ/mol).

Tags

NGSS.HS-PS1-4

Front

What is an exothermic reaction?

Back

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

Tags

NGSS.HS-PS1-4

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from the surroundings, resulting in a decrease in temperature.

Tags

NGSS.HS-PS1-4

Front

How can you identify a chemical change?

Back

A chemical change can be identified by the formation of new substances, color change, gas production, or temperature change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the difference between physical and chemical changes?

Back

Physical changes alter the form of a substance but not its chemical composition, while chemical changes result in the formation of new substances.

Tags

NGSS.MS-PS1-5

Front

What does it mean if a reaction is described as 'endothermic'?

Back

It means that the reaction absorbs heat from the surroundings, leading to a decrease in temperature.

Tags

NGSS.HS-PS1-4

Front

What does it mean if a reaction is described as 'exothermic'?

Back

It means that the reaction releases heat to the surroundings, leading to an increase in temperature.

Tags

NGSS.HS-PS1-4

Front

What is the significance of energy being written on the product side of a reaction?

Back

It indicates that the reaction is exothermic, as energy is released during the reaction.

Tags

NGSS.HS-PS1-4

Front

What is the significance of energy being written on the reactant side of a reaction?

Back

It indicates that the reaction is endothermic, as energy is absorbed during the reaction.

Tags

NGSS.HS-PS1-4

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Tags

NGSS.MS-PS3-4