Test Review for Friday May 28th

The particle in an atom that has a positive charge and determines the atomic number of an element is...

• the proton.

• the neutron.

• the electron.

• the nucleus

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. 

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

• Reactants
• Products 
• Yields 
• Chemical Equation 

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

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

Element or compound?
H₂O

• Element
• Compound

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

• Coefficient
• Subscript
• Atom
• Equation

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

• yes
• no

Is the following equation balanced?
4Fe + 3O₂ --> 2Fe₂O₃

• yes
• no