Chemical Equations

What does the number ₃ represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

What does the number 4 represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

How many Hydrogen (H) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

In the equation shown, what are the reactant(s)?

• N₂ + H₂

• NH₃

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

What does the symbol inside the circle mean?

• "yields, or produces"

• "dissolved in water"

• "forms a precipitate"

• "released as a gas"

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• yes

• no

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

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

• 1
• 2
• 3
• 4

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes
• No