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?2H2 + O2 --> 2H2O
  • Reactants
  • Products 
  • Yields 
  • Chemical Equation 
What is the right part of a chemical equation called...2H2 + O2 --> 2H2O
  • Reactants
  • Products 
  • Yields 
  • Chemical Equation 
What is the total number of atoms present in 5Na3PO4
  • 5
  • 40
  • 55
  • 8
How many Mn atoms are found in the following compound?3Cr(MnO4)6
  • 3
  • 4
  • 6
  • 18
What is the little number after an element in a chemical equation called.Example: H2
  • Coefficient 
  • Subscript
  • Atom
  • Equation
Is the following equation balanced?...Al + O2 --> 2Al2O3
  • Yes!
  • No!
How many elements are in C6H12O6?
  • 1
  • 2
  • 3
  • 4
Element or compound?H2O
  • Element
  • Compound
Element or compound?O2
  • Element
  • Compound
What is the number before a chemical formula called?Ex: 2H2 + O2 --> 2H2O
  • Coefficient
  • Subscript
  • Atom
  • Equation
How many aluminum atoms are in Al2(SO4)3?
  • 1
  • 2
  • 3
  • 4
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
  • H3PO4
  • H2SO4
  • HClO3
  • H2O
How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C10H12N2O
  • 10
  • 20
  • 25
  • 23
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
Is the following equation balanced?2C2H2 + 5O2 --> 4CO2 + 2H2O
  • yes
  • no
Is the following equation balanced?4Fe + 3O2 --> 2Fe2O3
  • yes
  • no
Is the following reaction balanced?NaHCO3 --> Na2CO3 + H2O + CO2
  • yes
  • no
Is the following reaction balanced?2CH3OH + 3O2 --> 2CO2 + 4H2O
  • yes
  • no
Which of the following equations are correctly balanced?
  • 12CO2 +H2O --> C6H12O6 + O2
  • CO2 + 9H2O --> C6H12O6 + O2
  • CO2 + H2O --> 3C6H12O6 + O2
  • 6CO2 + 6H2O --> C6H12O6 + 6O2
What is the Law of Conservation of Mass?
  • It states that matter cannot be created or destroyed.
  • It states that energy cannot be created or destroyed.
  • It states that matter can be created or destroyed.
  • It states that sound can be created or destroyed.
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 coefficient should be used to make the following equation balanced? N2+O2--> _NO 
  • 1
  • 2
  • 3
  • 4
Which problem is balanced?(Check ALL answers)
  • PbO2 + 2H2
  • SO2 + H20 --> H2SO4
  • 2Na + 2H2O --> 2NaOH + H2
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
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
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