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Constructed Response . Topic 5: Formulas and equations
Set D: Balancing equation, writing equation, conservation of atoms, formula writing
Base your answers to the questions 14 through 16 on the information below.
Scientists discovered, and have confirmed, that sulfur dioxide (SO2) and nitrogen oxides (NOx)
are the primarily causes of acid rain. In the US, about 2/3 of all SO2 comes from electric power
generator that relies on burning fossil fuels like coal.
When sulfur dioxides reaches the atmosphere, it oxidizes to first form sulfur trioxide SO3. It
then becomes sulfuric acid as it joins with water in the air and falls back down to earth. Acid
rain causes acidification of lakes and streams. In addition, acid rain accelerates the decay of
building materials and paints, including irreplaceable buildings, statues, and sculptures that
are part of our nation’s cultural heritage.
Write your answers here.
14. Write a balance chemical equation for the reaction 14.
Teacher Preview Copy
Teacher Preview Copy
between SO2 and O2 to form sulfur trioxide.
15. Write a balance chemical equation for the reaction 15.
between water and sulfur trioxide to form sulfuric acid.
16. Buildings and statues are often made of limestone which 16.
is composed of calcium carbonate. Write the formula for
calcium carbonate.
Set E. Types of chemical equation, balancing equations
Answe r questions 17 and 18 based on the equation and information below.
A neutralization reaction equation between nitric acid and calcium hydroxide is shown below.
___HNO3 + ___ Ca(OH)2 --------> ____Ca(NO3) 2 + H2O
17. Balance the neutralization reaction equation above, using the smallest whole number coefficients.
18. What is the sum of all coefficients in the balanced equation ? 18.
Base your answers to questions 19 through 21 on the equation below.
___ C2H6 + ___ O2 --------- > ___ CO2 + ___ H2O
19. Balance the equation above, using the smallest whole number coefficients.
20. What is the sum of all coefficients when the equation is balanced. 20.
21. What type of a chemical reaction is represented by the equation? 21.
380 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Set D: Balancing equation, writing equation, conservation of atoms, formula writing
Base your answers to the questions 14 through 16 on the information below.
Scientists discovered, and have confirmed, that sulfur dioxide (SO2) and nitrogen oxides (NOx)
are the primarily causes of acid rain. In the US, about 2/3 of all SO2 comes from electric power
generator that relies on burning fossil fuels like coal.
When sulfur dioxides reaches the atmosphere, it oxidizes to first form sulfur trioxide SO3. It
then becomes sulfuric acid as it joins with water in the air and falls back down to earth. Acid
rain causes acidification of lakes and streams. In addition, acid rain accelerates the decay of
building materials and paints, including irreplaceable buildings, statues, and sculptures that
are part of our nation’s cultural heritage.
Write your answers here.
14. Write a balance chemical equation for the reaction 14.
Teacher Preview Copy
Teacher Preview Copy
between SO2 and O2 to form sulfur trioxide.
15. Write a balance chemical equation for the reaction 15.
between water and sulfur trioxide to form sulfuric acid.
16. Buildings and statues are often made of limestone which 16.
is composed of calcium carbonate. Write the formula for
calcium carbonate.
Set E. Types of chemical equation, balancing equations
Answe r questions 17 and 18 based on the equation and information below.
A neutralization reaction equation between nitric acid and calcium hydroxide is shown below.
___HNO3 + ___ Ca(OH)2 --------> ____Ca(NO3) 2 + H2O
17. Balance the neutralization reaction equation above, using the smallest whole number coefficients.
18. What is the sum of all coefficients in the balanced equation ? 18.
Base your answers to questions 19 through 21 on the equation below.
___ C2H6 + ___ O2 --------- > ___ CO2 + ___ H2O
19. Balance the equation above, using the smallest whole number coefficients.
20. What is the sum of all coefficients when the equation is balanced. 20.
21. What type of a chemical reaction is represented by the equation? 21.
380 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
