Balancing Chemical Equations

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H₂O --> __NaOH + __H₂

• 2,2 --> 2,1
• 4,4 --> 4,1
• 1,2 --> 2,4
• 1,2 --> 2,1

Tags

NGSS.MS-PS1-5

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__Ca + __H₂O --> __Ca(OH)₂ + __H₂

• 2,1 --> 2,1
• 1,2 --> 1,1
• 1,2 --> 2,4
• 1,2 --> 2,1

Tags

NGSS.MS-PS1-5

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe₂O₃--> __Fe + __CO₂

• 3,1 --> 2,3
• 3,2 --> 1,1
• 3,2 --> 2,4
• 3,2 --> 2,1

Tags

NGSS.MS-PS1-5

Which problem is balanced?

• PbO₂ + 2H₂--> H₂SO₄
• SO₂ + H₂0 --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂
• 2Na + 2H₂O --> 2NaOH + H

Tags

NGSS.MS-PS1-5

What is a coefficient?

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

Tags

NGSS.MS-PS1-5

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

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

Tags

NGSS.MS-PS1-5

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

NGSS.MS-PS1-1

Number of H in 3(NH₄)₂CrO₄

• 4
• 6
• 8
• 24

Tags

NGSS.MS-PS1-1

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

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