Chem 100 Ch7 Post Lecture

When the equation, ___O2 + ___C 6H 14 → ___CO2 + ___H2O is balanced, the coefficient of O2 is:

19

Enter an equation for the precipitation reaction that occurs (if any) when solutions of potassium hydroxide and nickel(II) bromide are mixed. Express you answer as a chemical equation including phases.

2 KOH(aq)+NiBr₂(aq) → Ni(OH)₂(s)+2 KBr(aq) This equation starts with the reactants potassium hydroxide (KOH) and nickel (II) bromide (NiBr2). Taking into account oxidation numbers, write an equation in which reactants and products are neutral: KOH+NiBr2→KBr+Ni(OH)2. Next, determine whether either KBr or Ni(OH)2 is insoluble; otherwise, no reaction occurs. Compounds containing the alkali metals Li+, Na+, or K+ are soluble. Those containing the hydroxide ion are generally insoluble, with some exceptions. Since the nickel ion Ni2+ is not an exception, Ni(OH)2 is not soluble. For an equation to be balanced, there must be equal numbers of atoms of each element on each side of the reaction arrow. Using coefficients to finish balancing the equation and solubility rules to determine states of matter gives the final answer: 2KOH(aq)+NiBr2(aq)→2KBr(aq)+Ni(OH)2(s)

NaOH(aq)+FeBr3(aq)→ Express your answer as a chemical equation including phases. Enter noreaction if no precipitate is formed.

3NaOH(aq)+FeBr3(aq)→3NaBr(aq)+Fe(OH)3(s) https://www.clutchprep.com/chemistry/practice-problems/65939/complete-and-balance-each-of-the-following-equations-if-no-reaction-occurs-write

Nitric acid in acid rain forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. Write a balanced chemical equation for this reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.

4NO2(g)+O2(g)+2H2O(l)→4HNO3(aq) https://socratic.org/questions/nitric-acid-in-acid-rain-forms-when-gaseous-nitrogen-dioxide-pollutant-reacts-wi https://socratic.org/questions/how-do-you-write-a-chemical-formula-for-the-following-scenario-nitric-acid-is-a-

Which of the following is a chemical reaction? A) Propane forms a flame and emits heat as it burns. B) Bubbling is observed when potassium carbonate and hydrochloric acid solutions are mixed. C) Heat is felt when a warm object is placed in your hand. D) Acetone feels cold as it evaporates from the skin.

A,B

A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of: A. barium chloride. B. iron(III) chloride. C. magnesium chloride. D. potassium chloride. E. none of the above

A.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions? A. Pb2+, I- B. K+, I- C. NO3 -, Pb2+ D. Pb2+, NO3 - E. All the above ions are in the net ionic equation.

A.

Which compound would not form ions in the complete ionic equation? Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) Which compound would not form ions in the complete ionic equation? A. PbI2 B. KNO3 C. Pb(NO3)2 D. KI E. All compounds form ions in the complete ionic equation.

A.

Which of the following compounds is INSOLUBLE? A. aluminum sulfide B. potassium acetate C. lithium carbonate D. magnesium bromide E. none of the above

A.

Which of the following compounds is SOLUBLE? A. aluminum sulfate B. aluminum sulfide C. aluminum hydroxide D. aluminum carbonate E. none of the above

A.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? A. Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- B. Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- C. Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- D. Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- E. none of the above

B.

BaCl2(aq)+AgNO3(aq)→ Express your answer as a chemical equation including phases. Enter noreaction if no precipitate is formed.

BaCl2(aq)+2AgNO3(aq)→Ba(NO3)2(aq)+2AgCl(s) https://www.clutchprep.com/chemistry/practice-problems/65939/complete-and-balance-each-of-the-following-equations-if-no-reaction-occurs-write

Which ion(s) would NOT be present in the net ionic equation? Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic equation? A. Pb2+, NO3 - B. K+, Pb2+ C. K+, NO3 - D. K+, I- E. All the above ions are in the net ionic equation.

C.

Which of the following equations is NOT balanced properly? A. Cr2(SO4)3 + 6KOH → 2Cr(OH)3 + 3 K2SO4 B. 2NaHCO3 → Na2CO3 + CO2 + H2O C. 4NH3 + 14O2 → 4NO2 + 6H2O D. 2Cr + 6HCl → 2CrCl3 + 3H2 E. none of the above

C.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation? A. Pb2+ + I2- → PbI2(s) B. 2NO3- + 2K+ → 2KNO3 C. Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- E. Pb2+ + 2I- → PbI2(s) F. none of the above

E.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion would NOT be present in the complete ionic equation? Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) Which ion would NOT be present in the complete ionic equation? A. Pb2+ B. NO3- C. I- D. K+ E. All the above ions are in the complete ionic equation.

E.

Identify the spectator ions in the following complete ionic equation. Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq) Express your answers as ions separated by a comma. Do not enter the coefficient or phases.

I−,Na+ https://www.clutchprep.com/chemistry/practice-problems/76370/identify-the-spectator-ions-in-the-following-complete-ionic-equation-ba2-aq-2-i-?solution_search_id=225101&content_id=76370&content_type=3&search_index=0&product_type=chapter_practice

Na2CO3(aq)+CoCl2(aq)→ Express your answer as a chemical equation including phases. Enter noreaction if no precipitate is formed.

Na2CO3(aq)+CoCl2(aq)→2NaCl(aq)+CoCO3(s) https://www.clutchprep.com/chemistry/practice-problems/65939/complete-and-balance-each-of-the-following-equations-if-no-reaction-occurs-write

Enter a balanced equation for the reaction between solid chromium(III) oxide and solid carbon to produce solid chromium and carbon dioxide gas.

This equation starts with the reactants solid chromium(III) oxide (Cr2O3) and solid carbon (C). Taking into account oxidation numbers, writing an equation in which reactants and products are neutral gives Cr2O3+C→Cr+CO2. For an equation to be balanced, there must be equal numbers of atoms on each side of the reaction arrow. Using coefficients to balance the equation gives the balanced equation 2Cr2O3+3C→4Cr+3CO2 Lastly, solubility rules are used to add in states of matter, so 2Cr2O3(s)+3C(s)→4Cr(s)+3CO2(g) https://mediaplayer.pearsoncmg.com/assets/secs-tro-intro6-iwe-writing-balanced-chemical-equations

Part complete K2S(aq)+BaCl2(aq)→ Express your answer as a chemical equation including phases. Enter noreaction if no precipitate is formed.

no reaction