Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Tags

NGSS.HS-PS1-4

Front

In an exothermic reaction, heat is...

Back

given out.

Tags

NGSS.HS-PS1-4

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Tags

NGSS.HS-PS1-4

Front

In an endothermic reaction, heat is...

Back

taken in.

Tags

NGSS.HS-PS1-4

Front

What is bond energy?

Back

Bond energy is the amount of energy required to break one mole of a bond in a molecule.

Tags

NGSS.HS-PS1-4

Front

How much energy is needed to break all the bonds in methane (CH4)?

Back

About 1600 kJ.

Tags

NGSS.HS-PS1-4

Front

What instrument is used to measure temperature changes in reactions?

Back

Thermometer.

Front

What is the role of sunlight in photosynthesis?

Back

Sunlight provides the energy needed for the endothermic reaction of photosynthesis.

Tags

NGSS.HS-LS1-5

Front

Is photosynthesis an endothermic or exothermic reaction?

Back

Endothermic.

Tags

NGSS.HS-LS1-5

NGSS.HS-PS1-4

Front

What happens to temperature in an exothermic reaction?

Back

The temperature of the surroundings increases.

Tags

NGSS.HS-PS3-4