Chem Review 2/27

Fill in the blanks with coefficient:
PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which side of a chemical equation is the product side?

• Left (before the yields sign)
• Right (after the yields sign)

Which problem is balanced?

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

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-PS1-1

NGSS.MS-PS1-5

The blue numbers in the image below represent ________

• Charges
• coefficients
• subscripts
• none of the answers are correct

Tags

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

Which of the following has the most number of O?

• 2Mg₃(PO₄)₂
• 4AlPO₄
• 3Al(NO₃)₃
• 15KOH

Tags

NGSS.MS-PS1-1