5.0 Chemical Reactions

Front

What is the little number after an element in a chemical equation called?

Back

Subscript

Front

What does 'exo' mean in terms of energy?

Back

Released

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Front

What do we call a substance that increases the rate of a reaction without being used up during the reaction?

Back

Catalyst

Tags

NGSS.HS-PS1-5

Front

What law governs the balancing of chemical equations?

Back

Law of Conservation of Matter/Mass

Tags

NGSS.MS-PS1-5

Front

Which equation is balanced? 1) PbO2 + 2H2 2) SO2 + H2O --> H2SO4 3) 2Na + 2H2O --> 2NaOH + H2

Back

2Na + 2H2O --> 2NaOH + H2

Tags

NGSS.MS-PS1-5

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a reactant?

Back

A substance that takes part in and undergoes change during a reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a product in a chemical reaction?

Back

The substances that are formed as a result of a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms are involved.

Tags

NGSS.HS-PS1-7

Front

What is the difference between an endothermic and exothermic reaction?

Back

Endothermic reactions absorb energy, while exothermic reactions release energy.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4