Balancing Chemical Equations

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

• created
• destroyed
• changed
• equal

Tags

NGSS.MS-PS1-5

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 

• Subscript

• Atom

• Equation

What is the number before a chemical formula called?
Ex: 2H₂ + O₂ --> 2H₂O

• Coefficient
• Subscript
• Atom
• Equation

The coefficient in 3H₂O is

• 6

• 5

• 2

• 3

In 3P₂O₅, there are ​ (a)   phosphorus (P) atoms and ​ (b)   oxygen (O) atoms.

• 6
• 15
• 8
• 3
• 12
• 21

Tags

NGSS.MS-PS1-1

How many Oxygens are in this molecule? 
(OH)₂

• 4
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1

What's unbalanced about this equation? 

Al + O₂ --> Al₂O₃

• Oxygen (O) only

• Aluminum (Al) only

• Both oxygen and aluminum

• Nothing; it is balanced.

Tags

NGSS.MS-PS1-5

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

• yes

• no

Tags

NGSS.MS-PS1-5