Answer the following questions. Test Review Answer the following questions. Number 1 – 20 and write your answers on a separate piece of paper. This will go very quickly so you need to pay attention! We will check our answers at the end.
#1 Energy is either absorbed or released during a
#2 The substances listed on the left side of a chemical equation are called the
#3 In a chemical formula these #’s show the ratio of atoms of the different elements in a compound
#4 The process that changes matter into one or more new substances is a
#5 This number often appears in front of a chemical formula and tells you the number of molecules or atoms of each substance in the reaction
#6 The one way to REALLY know that a chemical reaction has occurred is that
#7 Atoms are neutral because they contain an equal number of what and what?
#8 “Conservation of Mass” means that matter is not ____________ or ___________.
#9 A shorter, easier way to show chemical reactions, using symbols instead of words, is called a __________________ ______________
# 10 Ca(NO3) How many atoms are in the compound ?
#11 2Ca(NO3) How many molecules are in the above compound?
# 12 Ca(NO3) How many elements are in the above compound?
# 13 Write a chemical formula for the compound: Sodium oxide
# 14 Write a chemical formula for the compound: Aluminum chloride
# 15 Construct a Lewis Dot structure for the following element: Oxygen (O)
16 Which of the following examples shows that a chemical reaction has occurred because new substances were formed? A A rock broke into smaller pieces when it was hammered. B Bubbles formed when baking soda and vinegar were mixed. C Water turned red when food coloring was added. D A solid was formed when water was cooled.
17. The chemical reaction below is what occurs when plants make food during photosynthesis. Which of the compounds are the reactants in this reaction? A Only CO2 B Only H2 O C Both CO2 and H2 O D Only C6 H12 O6 CO2 + H2O C6H12O6 + O2
18. Iron (Fe) reacts with oxygen (O) to form Iron Oxide (Fe2O3) 18. Iron (Fe) reacts with oxygen (O) to form Iron Oxide (Fe2O3). The properties of Fe2O3 are most likely: A Similar to both copper and oxygen B Similar only to oxygen C Similar only to copper D Different from copper or oxygen
19. The product in a balanced reaction is 4Al2O3 19. The product in a balanced reaction is 4Al2O3. Which of the following shows the number of aluminum and oxygen atoms in 4Al2O3? A 8 atoms of Aluminum and 12 atoms of Oxygen B 2 atoms of Aluminum and 3 atoms of Oxygen C 6 atoms of Aluminum and 7 atoms of Oxygen D 8 atoms of Aluminum and 3 atoms of Oxygen
# 20 A solid that forms from a solution during a chemical reaction is called
Let’s review the answers! You’re done Let’s review the answers!
# 1 Energy is either absorbed or released during a Chemical reaction
# 2 The substances listed on the left side of a chemical equation are called the reactants
# 3. In a chemical formula these #’s show the ratio of atoms of the different elements in a compound subscripts
#4 The process that changes matter into one or more new substances is a Chemical change
#5 This number often appears in front of a chemical formula and tells you the number of molecules or atoms of each substance in the reaction coefficient
#6 The one way to REALLY know that a chemical reaction has occurred is that A new substance is formed
#7 Atoms are neutral because the contain an equal number of what and what? Protons and electrons
#8 “Conservation of Mass” means that matter is not ____________ or ___________. Created or destroyed
#9 A shorter, easier way to show chemical reactions, using symbols instead of words, is called a Chemical equation
# 10 Ca(NO3) How many atoms are in the compound ? 5
# 11 2Ca(NO3) How many molecules are in the above compound? 2
# 12 Ca(NO3) How many elements are in the above compound? 3
# 13 Write a chemical formula for the compound: Sodium oxide Na2O
AlCl3 # 14 Write a chemical formula for the compound: Aluminum chloride AlCl3
O # 15 Construct a Lewis Dot structure for the following element: Oxygen (O) O
16. The chemical reaction below is what occurs when plants make food during photosynthesis. Which of the compounds are the reactants in this reaction? A Only CO2 B Only H2 O C Both CO2 and H2 O D Only C6 H12 O6 CO2 + H2O C6H12O6 + O2
17 Which of the following examples shows that a chemical reaction has occurred because new substances were formed? A A rock broke into smaller pieces when it was hammered. B Bubbles formed when baking soda and vinegar were mixed. C Water turned red when food coloring was added. D A solid was formed when water was cooled.
18. The product in a balanced reaction is 4Al2O3 18. The product in a balanced reaction is 4Al2O3. Which of the following shows the number of aluminum and oxygen atoms in 4Al2O3? A 8 atoms of Aluminum and 12 atoms of Oxygen B 2 atoms of Aluminum and 3 atoms of Oxygen C 6 atoms of Aluminum and 7 atoms of Oxygen D 8 atoms of Aluminum and 3 atoms of Oxygen
19. The product in a balanced reaction is 4Al2O3 19. The product in a balanced reaction is 4Al2O3. Which of the following shows the number of aluminum and oxygen atoms in 4Al2O3? A 8 atoms of Aluminum and 12 atoms of Oxygen B 2 atoms of Aluminum and 3 atoms of Oxygen C 6 atoms of Aluminum and 7 atoms of Oxygen D 8 atoms of Aluminum and 3 atoms of Oxygen
#19 A solid that forms from a solution during a chemical reaction is called precipitate