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Answer the following questions.
Test Review Answer the following questions.
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# 1. A solid that forms from a solution during a chemical reaction is called
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#2 Energy is either absorbed or released during a
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#3 The substances listed on the left side of a chemical equation are called the
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#4 In a chemical formula these #’s show the ratio of atoms of the different elements in a compound
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#5 The process that changes matter into one or more new substances is a
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#6 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
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#7 The one way to REALLY know that a chemical reaction has occurred is that
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#8 “Conservation of Mass” means that matter is not ____________ or ___________.
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#9 A shorter, easier way to show chemical reactions, using symbols instead of words, is called a __________________ ______________
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# 10 Ca(NO3) How many atoms are in the compound ?
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# 11 2Ca(NO3) How many molecules are in the above compound?
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# 12 Ca(NO3) How many elements are in the above compound?
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# 13 Write a chemical formula for the compound: Sodium oxide
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# 14 Write a chemical formula for the compound: Aluminum chloride
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15 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.
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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
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17. Iron (Fe) reacts with oxygen (O) to form Iron Oxide (Fe2O3)
17. 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
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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
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Let’s review the answers!
You’re done Let’s review the answers!
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#1 A solid that forms from a solution during a chemical reaction is called precipitate
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#2 Energy is either absorbed or released during a Chemical reaction
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#3 The substances listed on the left side of a chemical equation are called the reactants
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#4 In a chemical formula these #’s show the ratio of atoms of the different elements in a compound subscripts
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#5 The process that changes matter into one or more new substances is a Chemical change
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#6 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
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#7 The one way to REALLY know that a chemical reaction has occurred is that A new substance is formed
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#8 “Conservation of Mass” means that matter is not ____________ or ___________. Created or destroyed
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#9 A shorter, easier way to show chemical reactions, using symbols instead of words, is called a Chemical equation
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# 10 Ca(NO3) How many atoms are in the compound ? 5
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# 11 2Ca(NO3) How many molecules are in the above compound? 2
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# 12 Ca(NO3) How many elements are in the above compound? 3
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# 13 Write a chemical formula for the compound: Sodium oxide Na2O
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AlCl3 # 14 Write a chemical formula for the compound:
Aluminum chloride AlCl3
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15 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.
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15 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.
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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
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17. Iron (Fe) reacts with oxygen (O) to form Iron Oxide (Fe2O3)
17. Iron (Fe) reacts with oxygen (O) to form Iron Oxide (Fe2O3). The properties of Fe2O3 are most likely: A Similar to both iron and oxygen B Similar only to oxygen C Similar only to iron D Different from iron or oxygen
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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
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