Law of Conservation of Mass/Balancing Equations

If a reaction starts with a total 54g of reactants it should produce 

• a total of 40g of products
• a total of 54g of products

• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5

O + H₂ → H₂O

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g of water.

• 8

• 12

• 24

• 40

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many elements does PbNO₇ have?

Hint: Every capital letter😉

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

Substances present at the start of a chemical reaction are called ____.

• subscripts
• coefficients
• reactants
• products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Substances that form as the result, or at the end, of a chemical reaction are called ____.

• products
• reactants
• coefficients
• subscripts

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, rearranged

• None of the above

Tags

NGSS.MS-PS1-5

Label the reactants and products of the chemical reaction shown.

a

b

Reactants

Products

Tags

NGSS.MS-PS1-2

What are the reactants in this chemical equation?

• 6 CO₂ + 6 H₂O

• H₂O

• C₆H₁₂O₆

• C₆H₁₂O₆ + O₂

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

What are the products in this chemical equation?

• CO₂ + H₂O

• H₂O

• C₆H₁₂O₆

• C₆H₁₂O₆ + O₂

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

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

• Coefficient 
• Subscript
• Atom
• Equation