Balancing Chemical Equations

What is the Law of Conservation of Mass?

• It states that no matter can be created or destroyed.
• It states that no energy can be created or destroyed.
• It states that matter can be created or destroyed.
• It states that no sound can be created or destroyed.

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Number of H in 3(NH₄)₂CrO₄

• 4
• 2
• 8
• 24

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number in front of a chemical formula.
• The number in between the chemical symbols.
• The number behind a chemical formula.

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

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

• Yes
• No

Tags

NGSS.MS-PS1-5