Equilibrium Questions and Answers

Consider the reaction of N g O g 2 NO g What happens to the concentration of each subs when a N is increased b NO is decreased a NO select and 0 select b N select and 0 select

Ammonia has been studied as an alternative clean fuel for internal combustion engines since its reaction with oxygen produces only nitrogen and water vapor and in the liquid form it is easily transported An industrial chemist studying this reaction fills a 5 0 L flask with 4 1 atm of ammonia gas and 4 7 atm of oxygen gas and when the mixture has come to equilibrium measures the partial pressure of water vapor to be 3 7 atm Calculate the pressure equilibrium constant for the combustion of ammonia at the final temperature of the mixture Round your answer to 2 significant digits

WS pH May 12 2022 Complete the table 9 11 13 8 12 7 10 2 4 5 6 1 3 H pH log H 1 46 x 10 M 1 36x108m 4 55 x 10 11 M 2 25 x 10 M 1 13 10 10 m 7 83 x 10 5 M 1 34 x 10 12 OH IVIDIT 6 pOH log OH pH 68x106m 7 38 x 10 7 M 220x104m 4 45 X 10 13 m 8 86 x 10 5 M 1 28x10 10 0 00750 4 62 9 78 4 25 760 8 4 2 21 H OH 1x 10 14 POH 9 38 4 22 975 6 40 Acidic or Basic 5 60 11 79

When the reactants are heated at 500 C in a closed vessel H2 H2O 0 30 M at equilibrium If more hydrogen is added so that the new initial concentration of H2 g is H2 0 60 M What are the equilibrium concentrations of H2 g and H2O g once equilibrium is restored The answer is 0 45 but idk how

What is the pH of a solution 0 227 M C5H5N at 25C Kb 1 7 x 10 9

ame 36 What is the hydronium ion concentration H3O of a solution whose pH is 4 12 5 1 x 10 M 6 4 x 10 5 M 7 6 x 10 5 M 4 4 x 10 8 M blem a b C d 37 What is the pH and pOH for 4 23 x 10 M HNO3 solution

What is the theoretical pH of a 0 0001 M CSOH solution 0 0001 the pH can not be determined 10 02

Which of the following has the highest hydroxide ion concentration A buffer solution with pOH 11 5 A buffer solution with pH 5 2 O 0 1 M HBr 00 2 M H SO4 nuro wator at 25 C

7 12 points The following the reaction occurs in a IL flask 2H g 2NO g 2H O g N g Initially 2 60 mol of NO and 3 10 mol of H are in the flask At equilibrium the concentration of in the flask is 0 161 M a What is the equilibrium expression for the reaction b What is the value for the equilibrium constant for the reaction

35 Identify the oxidation number for each element 1 point per blank Al O3 0 2 S8 Al 5 HNO TOY RO S 2 HV 36 Predict the effect of decreasing the temperature on the position of the following equilibria 1 point each Shift right a H g Cl2 g 2HCl g energy Dubbed b 2NH3 g heat N2 g 3H2 g c CO g H O g CO2 g H2 g heat N 3 O ID B S P 4

Name L B 5 Which equilibrium constant represents a reaction that favors the reactants to the greates a Keq 100 b Keq 1 0 108 Keq 1 0 10 3 Keq 1 0 10 18 d e not enough information sted A B C D nadw ataixs mundiliups ls aroubong of begnado vistelamos sus ain D 6 For the reaction aA bB cC dD the equilibrium expression is ms laupo en 0158 251110030 21suborg or cinsloo doid 18 X Keq nolizoup srl 27SWEND TO INSStotz sit 2919lamon laadin slom ono alcups anoitetsomos tobom bus atsi to c A a B bdw is sim srt as oma sdt ai atouborq mol atastaser doidw is

Cu2S s Cu aq Cu aq 15 aq d Cu S s 2Cu aq S2 aq e none of the above 20 For the reaction 2N2O g O2 g 2N2 g what happens to the equilibrium position if pressure decreases 0 N 7 b a shifts to the left shifts to the right does nothing d doubles e halves N 072 anina

3 20 320 Which of the following is NOT an acid base conjugate pair a H CO3 and HCO3 b H O and OH H S and OH d NH4 and NH3 none of the above

Balance the equation below and use the PE diagram to answer the questions that follow for the reaction SHOW YOUR SET UP WORK for each problem SO g 0 g SO g 657 4 526 7 Potential energy kJ 328 4 reaction pathway 1 Label the reactants and products of this rxn on the graph Is this reaction endothermic or exothermic 2 Calculate the value for the activation energy of this reaction 130 7 kJ 3 What is the value of AH for this reaction 198 3 kJ

Select the single best answer Which of the following processes will result in a precipitation reaction O Mixing a NaNO3 solution with a CuSO4 solution Mixing a BaCl solution with a K SO4 solution Mixing a RbBr solution with a Li SO4 solution O

1 Answer the questions that follow based on the equation for the combustion of pentane C3H 2 1 O g CO g H O g AH 3536 kJ a Balance the equation for this reaction 4 pts b What would be the value of AH for the reverse of this reaction 3 pts c Calculate the mass of oxygen needed to produce 10 510 kJ of energy by this reaction 7 pts d Calculate the energy released by this reaction during the formation of 67 2 grams of carbon dioxide 7 pts Calculate the energy produced by the reaction of 40 3 grams of pentane with oxygen

1 A buffer is made with 0 200 M CH3COOH and 0 150 M CH3COONa where equilibrium constant is K 1 75 x 10 5 Calculate the pH assuming that the activity coefficient y make about the concentration of the solution how amb bon jersdinom viluzial rodromibulant zenie od Dy 1 What assumption did you make all no lo viovor of shiatuo slnos laide 1897

OH aq H CO3 aq HCO3 aq H O 1 Select Select Select Select Considering the reaction above label each specifies as conjugate acid CA conjugate base CB acid A or base B using the drop downs

The lonic compound iron II ate is a strong ectrolyte that completely dissociates when dissolved in water Determine the concentration of the two ions in an aqueous solution of 0 90 M iron III sulfate Tap on the options to select or deselect the ion concentrations Sulfate lon 0 30 M 0 60 M 0 90 M 1 80 M 2 70 M Iron III lon 0 30 M 0 60 M 0 90 M 1 80 M 2 70 M View Ion Sheet

4 2 points Building a nest O energy is released and entropy increases O O energy is absorbed and entropy increases energy is absorbed and entropy decreases energy is released and entropy decreases Previous

A chemist dissolves 122 mg of pure sodium hydroxide in enough water to make up 110 mL of solution Calculate the pH of the solution The temperature of the solution is 25 C Round your answer to 3 significant decimal places 0 t

The hydrogen ion concentration of a basic solution is 7 80 x 10 10 M What is the pH of the solution

OH aq H CO ag HCO3 aq H O l 1 Select Select Select A CA CB Select label each specifies as conjugate acid CA conjugate base CB acid A or base B using the drop downs Select

Would O3 be more soluble in a polar or nonpolar solvent Nonpolar Polar

Which statement best describes the importance of balanced chemical equations while solving stoichiometry problems A balanced equation shows the reacting ratios of a all substances involved in the reaction in terms of moles A balanced equation shows the reacting ratios of b all substances involved in the reaction in terms of grams A balanced equation only gives the chemical c formulas of the substances involved in the reaction d A balanced equation is not important in stoichiometry problems

0500 M hypochlorous acid HCLO a weak acid K 3 5 10 8 M ut

3 Calculate the H and pH for the HCL solution in problem 32 2 points 0 148

Carbon dioxide system has phase equilibria 0 1 04 02

1 A 29 9 m sample of 0 150M formic acid HCH2 is titrated with 0 150m NaOH Calculate the plt after the addition of 29 9mL of NaoH For HCHO i ka 76 X10 0

A reaction done at 100 C without catalysts has the reactant concentration graph shown below What is the most likely reactant concentration graph for a reaction done at 125 C 100 75 50 25 0 100 75 50 25 100 75 50 25 0 0 0 0 Percentage L 5 5 Percentage A 10 Percentage C 5 10 10 15 15 20 15 20 Graph A Graph B 25 Time min 20 25 30 35 25 U Reactants Products Time min 30 35 Reactants Products Reactants Time min 30 35 Products 100 75 50 25 0 100 75 50 25 0 0 0 Percentage B 5 10 Percentage D 5 10 15 20 15 20 Time min 25 30 35 25 Reactants Products Reactants Products Time min 30 35

3 In which of the following aqueous solutions does the weak acid exhibit the lowest percentage ionization A 0 01 M HC H O K 1 8 10 mance an A B 0 01 M HNO K 4 5 104 C 0 01 MHF K 6 8 104 D 0 01 MHCIO Ka 3 0 108 a

Iron metal reacts with a copper sulfate solution CuSO Which of the following would result in the highest rate of reaction O Iron powder in 1 M CuSO O A solid piece of iron in 2 M CuSO O tron powder in 2 M CuSO4 OA sold piece of iron in 1 M CUSO

The pH of an aqueous solution at 25 C was found to be 11 00 The pOH of this solution is The hydronium ion concentration is M

Identify whether each species functions as a Br nsted Lowry acid or a Br nsted Lowry base in this net ionic equation CIO Br nsted Lowry HS Br nsted Lowry In this reaction The formula for the conjugate of CIO is HCIO Br nsted Lowry S Br nsted Lowry

An important reaction in visual excitation in the retina is the hydrolysis of guanosine triphosphate What is the value of equilibrium constant Kee for this reaction GTP H O 4 GDP HPO4 DG 30 13 J mole Click to open 0 865 O 0 988 3 428

The salt that has least solubility at 20 C is Otable salt Osodium nitrate potassium nitrate O calcium chloride

A chemist dissolves 141 mg of pure potassium hydroxide in enough water to make up 100 mL of solution Calculate the pH of the solution The temperature of the solution is 25 C Round your answer to 3 significant decimal places

What concentration of sodium hydroxide is needed to give an aqueous solution with a pH of 10 970 Molarity of sodium hydroxide M

What is the pOH of an aqueous solution of 6 82x10 2 M sodium hydroxide POH

sider mix of 1 36M HOLO and 1 65M Nallo K HUO 2 9 10 that is t eb

31 2 ml sample of 0 233 M HCHO is titrated with 0 233M NaOH Calculate I after the addition of 31 2 ml of Na O ka HCHO 1 76 10 4 ER L int bet qquivalence point

True or False A strong base dissociates completely O True O False

3 Calculate each of the following and determine if the solution is acidic basic or neutral A B N A B N A B N A B N A B N A B N A B N A B N a Find the pH when the pOH 5 4 b Find the pH when the H 2 4 x 10 8 c Find the H when the pH 2 8 d Find the pOH when OH 5 6 x 10 1 Find the H when OH 8 6 x 10 e f Find the OH when pOH 12 3 g Find the pOH when pH 7 0 h Find the OH when H 5 4 x 10 1 9 A neutralization reaction is which of the 5 types of chemical reactions 10 What are the reactants in a neutralization reaction What are the products 11 Complete and balance the following equation H3PO4 NaOH 12 Complete and balance the following equation HNO3 Ca OH 2

chemist dissolves 813 mg of pure hydrochloric acid in enough water to make up 110 mL of solution Calculate the pH of the solution Round your answer to significant decimal places 11 C

During an experiment 0 852 mol of H and 0 426 mol of 12 were placed into a 1 42 liter vessel where the reaction H g 12 g 2HI g came to equilibrium For this reaction K 49 5 at the temperature of the experiment What were the equilibrium concentrations of H I and HI Incorrect H i M

Question 25 Select Olonic compounds with polyatomic inn 17 3 0 52 0 00050 What kind of substances do not dissociate in 3 3 10 7 and the solution is Select

A chemist dissolves 436 mg of pure perchloric acid in enough water to make up 310 mL of solution Calculate the pH of the solution Round your answer to 3 significant decimal places 11 0x t

Calculate the pH of a buffer made by adding HCO H formic acid and NaCO H to water if at equilibrium CO H 8 00 x 103 M HCO H 2 50 x 104 M and the K 1 77 x 104 This is part 1 give the H3O HCO H H O CO H H30 1 OA 4 43 x 10 8 OB 5 53 x 10 6 C 2 21 x 10 D 181 x 105

4 0 400 M nitric acid HNO3 a strong acid 0 4m HNO3 HNO3 PH log H log 0 4 0 398 and POH 14 PH 44 0 398 POH 13 602 13 6 2910501

Complete the reaction then give the expression for the Ka for H S in water H S H O H30 1 O A K OB K H S H3O HS 1 O C HS H 0 K H S HS H3O K H S D H S H3O HS 1