MILT 525 EXAM 2 STUDY GUIDE 2026
QUESTIONS WITH SOLUTIONS GRADED A+
◉ [2]C2H2+C2H2+ [5] O2⟶O2⟶ [4] CO2+CO2+ [2] H2OH2O.
Answer: [2]C2H2+C2H2+ [5] O2⟶O2⟶ 4 CO2 + 2 H2O
◉ Physical Change. Answer: Change in state
Change in size
Tearing apart
Breaking into pieces
Grinding into powder
Dissolving
◉ Chemical Changes. Answer: Temperature increase*
Formation of gas bubbles*
Permanent color change
Formation of precipitate
Odor change
Change in pH
◉ Law of Conservation of Matter. Answer: atoms of matter are not
created or destroyed during a chemical reaction.
,◉ Oxygen (O2). Answer: is a colorless, odorless gas that supports
combustion. A glowing wooden splint will brighten or burst into
flames when inserted into a container.
◉ Hydrogen (H2). Answer: is a colorless, odorless gas that burns in
air. Hydrogen is less dense than air that can be captured in an
inverted vessel, or in a test tube with a paper towel plug. A mixture
of hydrogen and air in a test tube will burn with a "pop" when
exposed to a lit wooden splint.
◉ Carbon dioxide (CO2). Answer: is a colorless, odorless gas that
does not burn in air or support combustion. For that reason, it is
used to extinguish fires. When dissolved in water, it forms a mildly
acidic solution containing carbonic acid, H2CO3(aq). A lit wooden
splint will go out when inserted into a container of carbon dioxide.
◉ Composition (Combination) Reaction. Answer: 𝐀 + 𝐁 ⟶ 𝐀𝐁
2 reactants 1 product
◉ Decomposition Reactions. Answer: AB ⟶ A + B
1 reactant 2 products
◉ Single Replacement Reactions. Answer: A + BC ⟶ B + AC
, element + compound ⟶ Element + compound
◉ Double Replacement Reactions. Answer: AB + CD ⟶ AD + CB
2 compounds + 2 New Compounds
◉ Combustion Reactions. Answer: C_H_ + O2 ⟶ xCO2 + H2O
Fuel + Oxygen ⟶ Carbon Dioxide + Water
◉ Percent recovery formula. Answer: (Product mass)/(initial mass)
x 100
◉ How should the mass of copper metal at the end of the reactions
compare to the starting mass of copper?. Answer: The produced
mass of copper should equal the starting mass of copper.
◉ What does a percent recovery of more than 100% likely indicate?.
Answer: The product still contains some water.
◉ Decomposition Example using copper. Answer:
Cu(OH)2(s)Δ−→CuO(s)+H2O(g)
QUESTIONS WITH SOLUTIONS GRADED A+
◉ [2]C2H2+C2H2+ [5] O2⟶O2⟶ [4] CO2+CO2+ [2] H2OH2O.
Answer: [2]C2H2+C2H2+ [5] O2⟶O2⟶ 4 CO2 + 2 H2O
◉ Physical Change. Answer: Change in state
Change in size
Tearing apart
Breaking into pieces
Grinding into powder
Dissolving
◉ Chemical Changes. Answer: Temperature increase*
Formation of gas bubbles*
Permanent color change
Formation of precipitate
Odor change
Change in pH
◉ Law of Conservation of Matter. Answer: atoms of matter are not
created or destroyed during a chemical reaction.
,◉ Oxygen (O2). Answer: is a colorless, odorless gas that supports
combustion. A glowing wooden splint will brighten or burst into
flames when inserted into a container.
◉ Hydrogen (H2). Answer: is a colorless, odorless gas that burns in
air. Hydrogen is less dense than air that can be captured in an
inverted vessel, or in a test tube with a paper towel plug. A mixture
of hydrogen and air in a test tube will burn with a "pop" when
exposed to a lit wooden splint.
◉ Carbon dioxide (CO2). Answer: is a colorless, odorless gas that
does not burn in air or support combustion. For that reason, it is
used to extinguish fires. When dissolved in water, it forms a mildly
acidic solution containing carbonic acid, H2CO3(aq). A lit wooden
splint will go out when inserted into a container of carbon dioxide.
◉ Composition (Combination) Reaction. Answer: 𝐀 + 𝐁 ⟶ 𝐀𝐁
2 reactants 1 product
◉ Decomposition Reactions. Answer: AB ⟶ A + B
1 reactant 2 products
◉ Single Replacement Reactions. Answer: A + BC ⟶ B + AC
, element + compound ⟶ Element + compound
◉ Double Replacement Reactions. Answer: AB + CD ⟶ AD + CB
2 compounds + 2 New Compounds
◉ Combustion Reactions. Answer: C_H_ + O2 ⟶ xCO2 + H2O
Fuel + Oxygen ⟶ Carbon Dioxide + Water
◉ Percent recovery formula. Answer: (Product mass)/(initial mass)
x 100
◉ How should the mass of copper metal at the end of the reactions
compare to the starting mass of copper?. Answer: The produced
mass of copper should equal the starting mass of copper.
◉ What does a percent recovery of more than 100% likely indicate?.
Answer: The product still contains some water.
◉ Decomposition Example using copper. Answer:
Cu(OH)2(s)Δ−→CuO(s)+H2O(g)
