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8. Which condition is not a condition for an equilibrium system? A. equal rates for opposing changes B. a closed system C. reactants in the same phase D. constant temperature Knowledge/Understanding: 8 marks 9. What is the Brønstead-Lowry definition of a base? A. a substance that donates protons B. a substance that accepts protons C. a substance that dissolves in water to form OH ions D. a substance that dissolves in water to form H' ions A. HO 10. What is the conjugate acid of H/PO. (e? B. OH C. H:PO D. HPO? E. POd 11. What is the conjugate base of HSOM? A. HOY B. OH C. H-SO D. SO? E. This compound does not have a conjugate base. 12. What is the concentration of hydroxide ions in a solution of 0.350 mol/L Hiwe? A. 0.350 mol/L B. 0.175 mol/L C. 2.86 x 10-moll D. 0.650 mol/L E. 130 mol/L

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ALSO [4]: How would you identify these ions in aqueous solution by selective precipitation?

 

 

 

 

Question 11                                                     0/1 pts

At 427°C, a 5.0 L flask contains 20.0 moles of HCI, 18.0 moles of , 12.0 mol of , and 5.9 moles of water vapor at equilibrium. Calculate the for the reaction:

0.1967

You can get the concentrations (in M) for each substance by dividing the moles of an individual substance by the vessel volume.

During moderate activity, an endurance athlete mobilizes 40 grams of liver glycogen as free glucose in a two-hour period. Assume the entirety of this liberated glucose was used in the production of ATP via aerobic metabolism, yielding 32 ATP per glucose. Given the molar mass of glucose is 180g/mol, how many moles. To the nearest tenth of a mole, of ATP were synthesized from this mobilized liver glycogen? Please show your work and step by step

Calculate the Q-values for the electron-capture, beta+, and beta- decays of 64Cu.

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Treatment of a terminal alkene with ozone, followed by dimethyl sulfide (DMS), produces two carboxylic acids.

◯ True 

◯ False

If 20% of a compound is magnesium sulfate and the rest is aluminum hydroxide, the ratio of aluminum
hydroxide to magnesium sulfate is:
a. 3 : 1
b. 1 : 3
c. 0.25 : 1
d. 4 : 1

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13. A solution contains 3.25 x hydroxide ions. What is the pH of the solution?

A. 3.25

B. 6,51

C. 7.49

D. 8,00

E. none of the above

14. Identify the weakest acid,

A. HCN                  = 62 x  

B. HCOOH              = 1.8 x  

C.              = 72 x

D. HF                    = 66 x

E. All acids are the same strength, as long as they have a dissociable hydrogen ion.

15. The equilibrium system shown below was analyzed and the concentrations of    and were found, in mol/L, to be 4.4, 3.2, 1.5 respectively. The equilibrium constant must be which of the following? 

A. 4.0

B. 0.25

C. 0.92

D. 1.1

E. 0.16

16. The equilibrium shown below was analyzed and the concentrations of  , and were found in mol/L, to be 4.5, 2.6 and 12. The equilibrium constant must be which of the following? 

A. 1.4

B. 0.69

C. 9.8

D. 0.84

E. 1.2, 

17. A full syringe contains this equilibrium 

If nitrogen dioxide gas is brown and the other gas is colourless, what is observed when the syringe is used to compress this gas mixture?

A. the mixture gets darker

B. the mixture gets lighter

C. no change in colour of the mixture

D. the mixture is colourless

18. Consider this equilibrium

If some nitrogen gas were injected into this system at constant temperature and pressure the system would most likely experience which of the following?

A. an increase in (hydrogen)

B. a decrease in (ammonial)

C. a decrease in (hydrogen)

D. an increase in (ammonia)

E. both c and d

19. Consider the following system at equilibrium

    Which of the following actions would cause the   to increase? 

A. I and II

B. III and VI 

C. IV and V

D. III

E. VI

If 2.31 kg of a drug is used to make 2,000 tablets, how many milligrams of drug will 40 tablets contain?
a. 0.0462 mg
b. 462.00 mg
c. 46200 mg
d. 46.2 mg

Degrees of Unsaturation (show work)

2) Complete the spectroscopy data tables for a compound with molecular formula . Determine the structure of the compound. Any labile protons, if they exist, will not be present in the 'H NMR spectrum. Look carefully at the integration values! 

1. 0.02531 g = 25.31 kg

   True

   False

QUESTION 10

1. The equipment that measures the temperature is called:

   Thermometer

   Thermodynamic

   Thermochemistry

   Thermoelectric

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1. For the gaseous equilibrium shown, 3A+B C+2D, some C is added to the system. The quantity of D will rise

A. True

B. False

2. A system at equilibrium means the concentration of reactants is equal to the concentration of products.

A. True

B. False

3. A concentrated weak acid cannot have a lower pH than a dilute strong acid.

A. True

B. False

4. A concentrated weak base can have a lower pOH than a dilute strong base

A. True

B. False

5. 1.0 mol/L solutions of weak bases will have a higher p#than 1.0 mol/l solutions of strong bases,

A. True

B. False

6. Conjugate acid base partners differ by a single proton,

A. True

B. False

Multiple Choice

Identify the choice that best completes the statement or answers the question.

7. A concentrated weak acid is best described as which of the following?

A. a solution with a low pH

B. a solution where the concentration of undissociated acid particles is low compared to the concentration of hydronium ions

C. a solution where the concentration of hydronium ions is large compared to the concentration of undissociated acid particles

D. a solution with a high pH

E. a solution where the concentration of undissociated acid particles is high and the relative quantity of hydronium ions is small

2. ** (Student HW) Breathing uses chemical and mechanical processes to bring oxygen to every cell of the body and to get rid of carbon dioxide. Our body needs oxygen to obtain energy to fuel all our living processes. Carbon dioxide is a waste product of that process. The following table gives the measured pressures of the major gases in both inhaled and exhaled air.

	Inhaled Air / mmHg	Exhaled Air / mmHg
	597	568
	513	116
	0.3	28
	5	48
	8	8

A mixture was prepared in a 500 mL reaction vessel from 395 mL of (measured at 15.8°C and 800 torr) and 506 mL of (measured at 44.3°C and 1320 torr).

The mixture was ignited and the and reacted to form water. What was the final pressure inside the reaction vessel after the reaction was over if the temperature was held at 105°C?

eTextbook and Media

Hint                                                          Assistance Used

Start with two pieces of information:

(1) the balanced chemical reaction  

(2) the number of moles of each gas. This will allow you to determine how much water is made in the reaction, what remains, and what the remaining pressures will be in the flask.

Also, review the ideal gas law.

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QUESTION 18

How many grams of oxygen are contained in 19.5 grams of iron(III) perchlorate?

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Question 8  (5 points)

(a) Name one of the organic compounds in this reaction [1]

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How do you read the volume from the cylinder in the picture below? 

◯ 22.5 mL

◯ 24.0 mL

◯ 23.5 ml

◯ 23.0 ml

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Question 12 (1 point)

Which of the following could be added to an aqueous solution of weak acid HF to increase the percent dissociation? 

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Question 4 (5 points)

(a) Draw the Lewis structure for the nitrite ion,[1]

(b) Explain, considering hybrid orbital theory, the correct hybridization and shape of the central atom for the nitrite ion, . Upload your handwritten rationale and any appropriate work here. [2]

(c) Explain why sodium nitrite, is a solid and nitrogen dioxide, , is a gas at room temperature. [2] 

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Which sequence of reagents will best accomplish this transformation? НО HBr, BUOOBU, Mg ether then H20 o Mg ether HO H. then H20 e NBS Mg. B000Bu, other then Ho NBS TON MO ther then H20

Construct the MO diagram of hydrazine (H2NNH2). Compare to its Lewis structure and describe bonding.

You have been given stock solutions of glucose (1.50 M), asparagine (150 mM) and NaH2PO4 (25.0 mM). How much of each solution do you need to prepare 460.00 mLmL of a reagent that contains 95.00 mMmM glucose, 70.00 mMmM of asparagine, and 7.50 mMmM NaH2PO4?

1. How much of the stock glucose solution do you need? in mL

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 Use the References to access important values if needed for this question.

Draw a structural formula for cis-2-octene, clearly showing the geometry about the double bond. 

You've been given a solution containing 5.00 mg/mLmg/mL mg/mL of anti-actin antibody. You need to incubate this antibody with 40.00 mLmL of actin solution at a 1:6000 dilution.

How many µL of antibody would you add?

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 Use the Reference access important values if needed for this question. 

Decide for which of the following compounds cis-trans Isomerism is possible and draw the trans isomer for that compound, clearly showing the geometry about the double bond.

• 3-hexene

• 1-hexene

A quantity (0.0250 mol) of an ideal gas is expanded reversibly from 35.0 mL to 90.0 mL at a constant temperature of 30.0 °C inside of a frictionless piston. Calculate the amount of work, in J, done by the system.

QUESTION 1

1. If a measured quantity is written correctly, which digits are certain?

   All the digits are certain

   All but the last two digits

   The first digit only

   All but the very last digit

QUESTION 2

1. The balance that is located in the Chemistry Lab measures the mass in:

   Milliliters

   Liters

   Grams

   Kilograms

QUESTION 3

1. 42 oC =

   300.15 K

   315.15 K

   273.15 K

   231.15 K

QUESTION 4

1. 53.5 mL equals:

   0.535 L

   0.0535 L

   5350 L

   0.00535 L

QUESTION 5

1. If a measured quantity is written correctly, which digits are uncertain?

   None of the digits are uncertain

   The last digit only

   The last two digits

   All the digits except for the first one

QUESTION 6

1. 21.5 oC =

   726.7 oF

   294.65 oF

   38.7 oF

   70.7 oF

QUESTION 7

1. Beakers do not give an accurate reading of volumes.

   True

   False

Rank the following quantities in order of decreasing distance.

Rank from longest to shortest distance. To rank items as equivalent, overlap them.

Reset

Help

• 1 cm
• 5 million nm
• 1 mm
• 1 km
• 100 m
• 1 Mm
• 50 mm

1. In the equation + 2l    2Br + The change of l to _____ while the change of to Br is ______

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The normal boiling point of mercury is 356.7°C. What is the vapor pressure (in atm) of mercury at 315.0°C? Mercury has an enthalpy of vaporization of 58510 J/mol

Report your answer to 3 sig figs without units. 

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Predict the organic products of the reaction. Show stereochemistry clearly.

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If a particular liquid has a normal boiling point of 338.0 K, and a vapor pressure of 75.0 mmHg at 285.0 K, what is   (in kJ/mol) for the liquid?

Recall that 760 mmHg - 1 atm

Report your answer to 3 sig figs without units

Concentrated HCl has a molarity of 12.1M.

1. What volume of HCl (in mL) do you need to prepare 250.00 mL of 3.25 MM M HCl? in mL