A. Incorrect. Check the sum of elements of the same type on both sides of the equation. B. Correct. You have balanced the equation correctly!
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1 DAT General Chemistry Problem Drill 07: Balancing Equations Question No. 1 of When the following equation is balanced, what is the coefficient for NaOH? H 2 CO 3 (aq) + NaOH (aq) Na 2 CO 3 (aq) + H 2 O (l) Question #01 (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 B. Correct. You have balanced the equation correctly! 1 H 2 CO NaOH 1 Na 2 CO H 2 O Answer: (B) 2
2 Question No. 2 of When the following equation is balanced, what is the coefficient for O 2? KClO 3 KCl + O 2 Question #02 (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 B. Incorrect. C. Correct! You correctly balanced this equation. 2 KClO 3 2 KCl + 3 O 2 Answer: (C) 3
3 Question No. 3 of What is the coefficient for HNO 2 when the following reaction is balanced? Cr 2 O HNO 2 Cr NO 3 Question #03 (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 Check the sum of elements and charges of the same type on both sides of the equation. B. Incorrect. Check the sum of elements and charges of the same type on both sides of the equation. C. Correct. You correctly balanced this equation! Check the sum of elements and charges of the same type on both sides of the equation. Check the sum of elements and charges of the same type on both sides of the equation. Use half-reaction method with acid environment 5 H + + Cr 2 O HNO 2 2 Cr H 2 O + 3 NO 3 - Answer: (C) 3
4 Question No. 4 of What are the coefficients for this equation when it is balanced? H 2 + O 2 H 2 O Question #04 (A) H 2 + O 2 H 2 O (B) 2 H 2 + O 2 2 H 2 O (C) H O 2 H 2 O (D) H 2 + O 2 2 H 2 O (E) 2 H 2 + O 2 H 2 O Re-exam the total count of each element on both sides of the reaction. B. Correct. You correctly balanced this equation! Re-exam the total count of each element on both sides of the reaction. D Incorrect. Re-exam the total count of each element on both sides of the reaction. Re-exam the total count of each element on both sides of the reaction. The sums are added up correctly for both sides. 2 H O 2 2 H 2 O Answer: (B) 2 H 2 + O 2 2 H 2 O
5 Question No. 5 of What are the coefficients of the following equation when it is balanced? Mg + Na + Na + Mg 2+ Question #05 (A) Mg + Na + Na + Mg 2+ (B) Mg + 2 Na + 2 Na + Mg 2+ (C) 2 Mg + Na + 2 Na + Mg 2+ (D) 2 Mg + 2 Na + 2 Na + 2 Mg 2+ (E) Mg + 2 Na + Na + 2 Mg 2+ Make sure to balance the charges as well. B. Correct. You correctly balanced the charges as well as the elements. Make sure to balance the charges as well. Make sure to balance the charges as well. Make sure to balance both the charges and the elements. Remember to balance charges as well as atoms 1 Mg + 2 Na + 2 Na + 1 Mg 2+ Answer: (B) Mg + 2 Na + 2 Na + Mg 2+
6 Question No. 6 of Which are the spectator ions in the following reaction? CaCl 2 (aq) + Na 2 SO 4 (aq) CaSO 4 (s) + NaCl (aq) Question #06 (A) Ca 2+ and Cl - (B) Ca 2+ and Na + (C) Cl - and Na + (D) Ca 2+ only (E) No sepectator ions Ca 2+ forms the solid product, not the spectator ion. B. Incorrect. Ca 2+ forms the solid product, not the spectator ion. C. Correct. Since CaSO 4 is the solid product, hence Na + and Cl - are the spectator ions. Ca 2+ forms the solid product, not the spectator ion. There is indeed more than one spectator ion in this reaction. Net ionic equations separate all aqueous ionic compounds into ions. The spectator ions Na + and Cl - are then cancelled out. Answer: (C) Spectator ions: Na + and Cl - and net ionic equation: Ca 2+ + SO 4 2- CaSO 4
7 Question No. 7 of What is the coefficient for O 2 in the following reaction when it is balanced? CH 4 + O 2 H 2 O + CO 2 Question #07 (A) 1 (B) 3 (C) 5 (D) 2 (E) 4 Sum up the element counts on both sides and see which will make them equal on each element. B. Incorrect. Sum up the element counts on both sides and see which will make them equal on each element. Sum up the element counts on both sides and see which will make them equal on each element. D. Correct. You correctly balanced this equation. Sum up the element counts on both sides and see which will make them equal on each element. CH O 2 2 H 2 O + CO 2 Answer: (D) 2
8 Question No. 8 of The charges in an ionic compound are balanced by. Question #08 (A) Coefficients (B) Subscripts (C) Superscripts (D) Parenthesis (E) Electrons Coefficients balance elements in an equation. B. Correct. Subscripts balance charges in an ionic compound. Superscripts give the charge of an ion. Parenthesis is used to indicate the state of a species. Charges are not being balanced explicitly by electrons in the equation. Answer: (B) Subscripts
9 Question No. 9 of The Law of Conservation of Mass leads us to. Question #09 (A) Make sure the total number of atoms on each side of the equation is the same. (B) Make sure the same type of atoms on each side of the equation is the same. (C) Make sure the number of molecules on each side of the equation is the same. (D) Make sure the number of each type of atom is the same on each side of the equation. (E) Make sure the charges on both sides are the same. You need to be more specific than the total number of atoms on each side. B. Incorrect. Make sure the same type of atoms on each side of the equation is the same, doesn t make sense. The number of molecules on each side does not need to be the same. D. Correct. The number of each type of atom must be the same on each side. The Conservation of Mass is not about the charges. Answer: (D) Make sure the number of each type of atom is the same on each side of the equation.
10 Question No. 10 of What is the coefficient for HCl in the following equation? Ca(OH) 2 (aq) + HCl (aq) CaCl 2 (aq) + H 2 O (l) Question #10 (A) 1 (B) 2 (C) 3 (D) 4 (E) 0 Plug in and verify if the sums of each elements are equal on both sides. B. Correct. You correctly balanced this equation. Plug in and verify if the sums of each elements are equal on both sides. Plug in and verify if the sums of each elements are equal on both sides. Plug in and verify if the sums of each elements are equal on both sides. Ca(OH) 2 (aq) + 2 HCl (aq) CaCl 2 (aq) + 2 H 2 O (l) Answer: (B) 2
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