Exam 4: Chemical Reactions and Stoichiometry

If the percent yield for the following reaction is 65.0%, how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2KClO₃(s) → 2KCl(s) + 3O₂(g)

What element is being reduced in the following (unbalanced) redox reaction? Cr(OH)₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride: (aq) + (aq) → AgCl(s) Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.376 mol L^-1 solution to completely precipitate the silver?

According to the following balanced reaction, how many moles of KO are required to exactly react with 5.44 moles of H₂O? 4KO(s) + 2H₂O(l) → 4KOH(s) + O₂(g)

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Cr(OH)₄⁻ and ClO⁻ in the balanced reaction? Cr(OH)₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

What element is being reduced in the following (unbalanced) redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

Choose the statement below that is TRUE.

Which of the following compounds is an Arrhenius base?

Identify the oxidizing agent in the following redox reaction: Zn(s) + 2AgNO₃(aq) →? Zn(NO₃)₂(aq) + 2Ag(s)

Identify the balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapour.

Match the following. -NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)

What element is being oxidized in the following (unbalanced) redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

Balance the chemical equation given below, and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C. The density of nitrogen monoxide at 25 °C is 1.23 g L^-1. ________ NH₃(g) + ________ O₂(g) → ________ NO(g) + ________ H₂O(l)

Determine the concentration of a solution prepared by diluting 20.0 mL of 0.200 mol L^-1 NaCl to 250.0 mL.

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below. Which one of the following statements is FALSE? 3Fe(s) + 4H₂O(l) → Fe₃O₄(s) + 4H₂(g)

What is the concentration (M) of a NaCl solution prepared by dissolving 7.2 g of NaCl in sufficient water to give 425 mL of solution?

What element is being oxidized in the following (unbalanced) redox reaction? Zn²⁺(aq) + NH₄⁺(aq) → Zn(s) + NO₃⁻(aq)

Which of the following is a gas-evolution reaction?

How many moles of CuO can be produced from 0.900 mol of Cu₂O in the following reaction? 2Cu₂O(s) + O₂(g) → 4CuO(s)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium are needed to produce 0.40 mol of N when the reaction is carried out in the presence of excess nitrogen?