Stoichiometry and Balance Equations

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

Tags

NGSS.HS-PS1-7

Which equation is balanced?

• PbO₂ + 2H₂--> H₂SO₄

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

• 2Na + 2H₂O --> 2NaOH + H

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

What is a coefficient?

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

Balance this equation
_Zn+_HCl-->_ZnCl₂ +_H₂

• 1,1,2,1
• 1,1,1,2
• 1,2,1,1
• 2,1,1,1

Tags

NGSS.HS-PS1-7

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

• 1, 2,1
• already balanced
• 2,1,1
• 1,1,2

Tags

NGSS.MS-PS1-5

Number of H in 3(NH₄)₂CrO₄

• 4
• 6
• 8
• 24

Given the following equation, 4Al + 3O₂ --> 2Al₂ O_3, how many moles of aluminum oxide can be formed from 4 moles of aluminum?

• 2

• 6

• 1

• I have not a clue! Please help!

Tags

NGSS.HS-PS1-7

Given the following equation, 4Al + 3O₂ --> 2Al₂ O_3, how many grams of aluminum oxide can be formed from 59 grams of aluminum?

• 99 g

• 116 g

• I don't know how to do this type of problem. Please help!

• I don't see my answer here

Tags

NGSS.HS-PS1-7