Chemical Equations

In a chemical equation...

• a new substance is formed

• new atoms are formed

• old atoms disappear

• a equal sign is always used

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Reactants are

• new substances

• old substances

• likely to disappear

• likely to appear

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Products are

• old substances

• new substances

• atoms that disappear

• atoms that do not exist

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

• top, bottom

• right, left

• left, right

• bottom, top

An arrow in a chemical equation means the reaction is irreversible.

• True

• False

Worded equations provide the amount of each substance in the reaction

• True

• False

Tags

NGSS.MS-PS1-5

The law of conservation of mass states

• chemical reactions create new atoms

• atoms cannot be created or destroyed

• reactants vanish once a reaction takes place

• products appear when a reaction takes place

Tags

NGSS.MS-PS1-5

The amount of atoms on each side of a chemical equation are

• different

• the same

Tags

NGSS.MS-PS1-5

How many Potassium (K) atom are there?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Iron (Fe) and Oxygen (O) are there?

• Fe = 1, O = 2

• Fe = 2, O = 3

• Fe = 2, O = 1

• Fe = 1, O = 3

Tags

NGSS.MS-PS1-1