Balancing Chemical Reactions

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-5

A balanced equation has the ​ (a)   number of ​ (b)   in both the reactants and products.

• same
• each element
• atoms
• different
• molecules

Tags

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

Tags

NGSS.MS-PS1-1

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

How many Al are present in 5 Al₂(SO₄)₃?

• 2

• 5

• 10

• 15

Tags

NGSS.MS-PS1-1

How many atoms of Hydrogen are in the following formula?

3C₂H₆

• 3

• 6

• 9

• 18

Tags

NGSS.MS-PS1-1

What number of Nitrogen atoms are present in: 2 (NH₄)₂CO₃

• 1

• 2

• 4

• 8

Tags

NGSS.MS-PS1-1

3 H₂O has ​ (a)   molecules of water and each water contains ​ (b)   hydrogen for ​ (c)   total hydrogen​

• 3
• 2
• 1
• 6
• 4

Tags

NGSS.MS-PS1-1

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-5

Balance: ​ (a)   Al + ​ (b)   H₂SO₄ → ​ (c)   Al₂(SO₄)₃ + ​ (d)   H₂ ​

• 2
• 3
• 1
• 4
• 6

Tags

NGSS.HS-PS1-7