Balancing Equations

What is a reactant?

• a dangerous substance
• the substances you start with in a chemical reaction
• the substances that are formed by a chemical reaction
• a volatile chemical

What is a product?

• the substances that are formed by a chemical reaction
• a fancy word for make-up
• a volatile chemical
• the substances you start with in a chemical reaction

Tags

NGSS.MS-PS1-1

The number of atoms you begin with in a chemical reaction ....

• can be different to the number you finish with
• changes depending on how much energy is formed
• must be the same as the number of atoms you end with
• must be an even number

Tags

NGSS.MS-PS1-5

What mathematical function do coefficients perform in a balanced equation?

• Division
• multiplication
• subtraction
• addition

Balance the following: ____ Fe + ____ Cl₂ → FeCl₃

• 1,3,1
• 2,3,2
• 1,1,2
• 2,2,3

Tags

NGSS.MS-PS1-5

Balance the following: ____ Al + ____ O₂ → Al₂O₃

• 4,3,2
• 2,3,4
• 2,1,1
• 1,1,2

Tags

NGSS.MS-PS1-5

Balancing the following: ____ Al + ____ HCl → ____ AlCl₃ + ____H₂

• 1,3,1,2
• 2,6,2,3
• 2,3,2,3
• 3,2,6,2

Tags

NGSS.MS-PS1-5

Balance the following: ____ H₂SO₄ + ____ NaNO₂ → ____ HNO₂ + Na₂SO₄

• 4,3,2,1
• 1,1,2,1
• 2,3,3,2
• 1,2,2,1

Tags

NGSS.MS-PS1-5

2 H₂ + O₂ --> 2 H₂O What is the product?

• 2 H₂
• O₂
• 2 H₂O

Tags

NGSS.MS-PS1-2

This appears on the left side of a chemical formula, and represents how many molecules there are.

• An Atom
• The Coefficient
• A Molecule
• The Subscript