Stoichiometry Molecules

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

• Coefficient

• Subscript

• Reactant

• Product

A chemical substance that is present at the start of a chemical reaction

• Product

• Compound

• Reactant

• Coefficient

Which one is an empirical formula?

• H₂O₂

• C₂H₆O₁₂

• CaCl₂

• N₂O₈

Tags

NGSS.MS-PS1-1

What does the number ₃ represent in 4 NH₃?

• Subscript

• Superscript

• Coefficient

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃

•  P₄+ O₂ --> 2 P₂O₃

•  P₄+ 3 O₂ --> 2 P₂O₃

•  P₄+ 2 O₂ --> 3 P₂O₃

Tags

NGSS.MS-PS1-5

2CO  +  O₂  −-> 2CO_{2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?}

• 10

• 20

• 1

• 5

Tags

NGSS.MS-PS1-5

Balance this equation,            
Al₂O₃ --> Al + O₂ 

• Cannot be balanced

• 2Al₂O₃ --> 2Al+3O₂ 

• 2Al₂O₃--> 4Al+3O₂ 

• 3Al₂O₃--> 2Al+O₂ 

Tags

NGSS.MS-PS1-5

What is the total number of atoms present in 5Na₃PO₄

• 5

• 40

• 55

• 8

Tags

NGSS.MS-PS1-1

Which of the following is the chemical equation for: magnesium combines with oxygen to for magnesium oxide?

• Mg + O2 --> MgO

• 2Mg + 2O --> 2MgO

• 2Mg + O₂ --> 2MgO

• Mg2 + O --> Mg2O

Tags

NGSS.MS-PS1-5

12g of one reactant are added to 12g of another reactant and form a product. What will be the mass of the product produced?

• 12g

• 24g

• 18g

• 6g

Tags

NGSS.MS-PS1-5