Version A Balancing Chemical Equations Quiz

Element or compound?
H₂O

• Element
• Compound

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

• H₃PO₄
• H₂SO₄
• HClO₃
• H₂O

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

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

• Reactants
• Products 
• Yields 
• Chemical Equation 

Is the following reaction balanced?

CH₃OH + 3O₂ --> 2CO₂ + 4H₂O

• yes

• no

What information could a student determine from only the chemical formula of a protein?

• The color of the protein
• The number of molecules in each sequence of the protein
• The physical arrangement of atoms in the structure of the protein
• The number of atoms of each element in the protein

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

• Coefficient
• Subscript
• Atom
• Equation

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C₁₀H₁₂N₂O

• 10
• 20
• 25
• 23

Is the following reaction balanced?

2NaHCO₃ --> Na₂CO₃ + H₂O + CO₂

• yes

• no