Chemical Equation/Counting atoms Exit Slip 2026

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

According to the Law of Conservation of Matter (mass), The amount of atoms on each side of a chemical equation are

• different

• the same

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

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

Example: H₂

• Coefficient

• Atom

• Subscript

• Equation

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Complete the sentence.

During a chemical reaction, atoms ________.

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

Tags

NGSS.MS-PS1-5

What does this symbol Δ above the arrow mean?

• a precipitate is form

• heat is supplied

• a calalyst is needed

• electricity is needed

Tags

NGSS.HS-PS3-4

In the chemical equation H₂O₂(ag) → H₂O(l) + O₂(g), the O₂ is a

• reactants

• yield

• products

• solid

Tags

NGSS.MS-PS1-2