Quiz Name: Chemical Equations 
Type: Question and Answer 
Instructions: Write your answers on a separate sheet of paper. Then check your answers by clicking on “Answer Key” at the bottom of this page.

Question 1: What are the small numbers that go after elements and groups called?


Question 2: What are the large numbers that go in front of individual elements or compounds called?


Question 3: What type of reaction takes place when two elements combine to form one new compound?


Question 4: When you have an element in a reaction that is diatomic and not in a compound what subscript does it automatically get?


Question 5: Can coefficients be placed in the middle of compounds? (yes or no)


Question 6: If calcium and oxygen combine what would be the correct balanced formula for the compound formed?


Question 7: In this formula Ca + O ----> CaO does the oxygen or calcium need a diatomic two?


Question 8: After placing in the subscripts (Ca + O₂ ---> CaO) is this equation balanced? (yes or no)


Question 9: In (Ca + O₂ ---> CaO) where would you have to place a coefficient two to balance the O? In front of the Ca, O or CaO?


Question 10: Where would you have to place another coefficient two to balance (Ca + O₂ ---> 2CaO) ? In front of the Ca, O or CaO?


Question 11: What is the name for CaO?


Question 12: What is the name for O?


Question 13: What is the name for Ca?


Question 14: Now that this reaction is balanced 2Ca + O₂ ----> 2CaO what would be the product(s)? Calcium and Oxygen or Calcium Oxide?


Question 15: If calcium oxide is the product in 2Ca + O₂ ----> 2CaO what is the calcium and oxygen?


Question 16: The law of ____________ of matter says that matter cannot be created or destroyed in an ordinary chemical reaction.


Question 17: What type of reaction occurs when one compound is broken into two elements?


Question 18: What type of reaction is CaCl₂ + F₂ ----> CaF₂ + Cl₂?


Question 19: What type of reaction is CuCl + KBr ---> CuBr + KCl


Question 20: What do the names of compounds that contain two elements end in?


Question 21: What element is produced when iron iodide combines with chlorine?


Question 22: What element is produced when calcium chloride combines with magnesium?


Question 23: What compound is produced when calcium iodide combines with potassium?


Question 24: What is the formula mass for lead sulfate?


Question 25: What is the formula mass aluminum acetate?


Question 26: What is the formula mass for ammonium phosphate?


Question 27: What compound is formed when lead combines with oxygen?


Question 28: In what type of reaction are diatomics not checked?


Question 29: What are all compounds checked for?


Question 30: When there is 3 of an element on one side and 2 on the other side how many do you get on both sides? (spell out answer)


Question 31: (yes or no) Can subscripts be changed to balance one side of an equation with the other?


Question 32: (yes or no) Are diatomic checked in compounds?


Question 33: What type of reaction takes place when two elements combine to form a compound?


Question 34: What type of reaction takes place when an element takes the place of an element in a compound?


Question 35: In a double replacement reaction what type of materials are combining?


Question 36: (yes or no) Single replacement reactions produce two elements.


Question 37: When the reactant is one compound what type of reaction must be occurring?


Question 38: Which of the following are not diatomic chlorine, fluorine, oxygen, potassium, bromine, hydrogen , and sulfur.


Question 39: (yes or no) Do you check diatomics in compounds?

Answer Key