gr.8 Final Revision Term 1

Which problem is balanced?
(Check ALL answers)

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

Tags

NGSS.MS-PS1-5

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Balance this equation:

HgO ---> 2Hg + O₂

• It is balanced.

• 2HgO ---> 2Hg + O₂

• 2HgO ---> Hg + O₂

• HgO ---> Hg + 2O₂

Tags

NGSS.MS-PS1-5

Determine the coefficients to balance the equation.

__Al +__HCl --> __H₂ +__AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Tags

NGSS.MS-PS1-5

A burning match is an example of a(n) ______________ where matter can enter from or escape to the surroundings

• open system

• closed system

3 types of chemical reactions are synthesis,

• decomposition, and replacement

• there is only one type of chemical reaction

• open system, and closed system

• none of the above

4Si + S₈ --> 2Si₂S₄

• Synthesis
• Decomposition
• Replacement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2Pb(NO₃)₂ --> 2PbO + 4NO₂ + O₂

• Synthesis 
• Decomposition
• Replacement

• Combustion

Tags

NGSS.MS-PS1-2

3Mg + N₂ --> Mg₃N₂

• Synthesis 
• Decomposition
• Replacement

• Combustion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2NO₂ --> N₂ + 2O₂

• Synthesis
• Decomposition
• Replacement

• Combustion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5