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Chemistry Multiple Choice

1 In which direction will the point of equilibrium shift when a catalyst is added to the following equilibrium system?

KNO3 + 34.7 kJ K+1 (aq) + NO3-1 (aq)

a.Shift to the right
b.Shift to the left
c.No shift

2.The magnitude of Keq depends on
a.Initial concentration of reactants
b.Presence of a catalyst
c.Temperature
d.Volume of reaction vessel

3.In which direction will the point of equilibrium shift when the pressure is decreased in the following equilibrium?

H2 (g) + Cl2 (g) 2 HCl (g)
a.Shift to the right
b.Shift to the left
c.No shift

4.The equilibrium constant can change significantly with a change in
a.Concentration
b.Catalyst
c.Temperature
d.Pressure

5.In the following equilibrium, when sodium ion is removed, the concentration of chloride ion will
Na+1 (aq) + Cl-1 (aq) NaCl (s)

a.Increase
b.Decrease
c.Remain the same
---------------------------------------------------------------------------------- 

1. In which direction will the point of equilibrium shift when a catalyst is added to the following equilibrium system?

KNO3 + 34.7 kJ ---> K+ (aq) + NO3- (aq)

c.No shift

Catalyst won't affect equilibrium and the rates, as it only speeds up the reaction by decreasing the activiation energy.

2.The magnitude of Keq depends on

c.Temperature

Fact.

3.In which direction will the point of equilibrium shift when the pressure is decreased in the following equilibrium?

H2 (g) + Cl2 (g) ---> 2 HCl (g)

c.No shift

When pressure is decreased, equilibrium shifts to the greatest number of moles; there are equal number of moles on both sides.


4.The equilibrium constant can change significantly with a change in

c.Temperature

Only temperature effects rate constant.


5.In the following equilibrium, when sodium ion is removed, the concentration of chloride ion will
Na+ (aq) + Cl- (aq)---> NaCl (s)

a.Increase

If Na+ is taken out, equilibrium will shift to the left to increase [Cl-].

A 15mg strip of Magnesium metal reacts in 5.0 mL of 1.0M HCl over a given period. Evaluate the (mol HCl)/(mol Mg) ratio for the reaction. moles of each Mg and HCl by using their masses?

First convert mass to grams: 15 mg = 0.015 g

n(Mg) = 0.015 g / 24.31 g-mol = 0.00062 mol

For HCl, determine from product of volume (in liters) and molarity:

n(HCl) = (0.005 L)(1.0 M) = 0.0050 mol

So the ratio (mol HCl/mol Mg) = 0.0050 / 0.00062 = 250 / 31

If 2 moles of an ideal gas at STP are subjected to a new pressure of 24.7 kPa, what will be the volume of the gas? Answer in units of L.

PV=nRT... Solve for V
V=nRT/P
V=2 mol x 8.314 LkPa/molK x 273K / 24.7kPa
V=184 L

You are studying flower color in tulips. Yellow is dominant over white. You have discovered a yellow flower but are unsure of its precise genotype. What are the possible genotype(s) for this flower?

Yy or YY

A mother is a carrier for color blindness and a father is affected by color blindness.Is this trait dominant?

No. This trait cannot be dominant because the mother is a carrier which means she is a heterozygous. If this trait is dominant, then she will be affected too.

An organism's interrelationships within its environment constitute its?

A) trophic level
B) dominance rank
C) ecological niche
D) caste
E) habitat

ANSWER
C. Every organisms in an ecosystem plays their respective role (niche) to maintain a balanced environment.

Biology 3 Questions

1. What determines the size of a grape or a kernel of corn?
a. a combination of genetics and environmental factors
b. genetics alone
c. environmental factors alone

2. Because the grapes or corn come from a single genetic source, you would expect _________________.
a. that all the grapes or corn would fall into a fairly narrow range of values
b. that the grapes or corn would exhibit a great deal of variation
c. that all the grapes or corn would measure exactly the same

3. Which of the following is considered a measure of central tendency (indicates what the central value is, rather than the deviation from the center)?
a. average
b. range
c. variation


ANSWERS
1: A
2: A
3: A

Which of the following are empirical formulas?(Could be as many as 3) 1. H2O2 2. H2SO4 3. S2Cl2 4. CH2O 5. N2 6. C2H4

Which of the following are empirical formulas?(Could be as many as 3)
1. H2O2 
2. H2SO4 
3. S2Cl2 
4. CH2O 
5. N2 
6. C2H4

H2O2 = 2(HO) = HO

H2SO4

S2Cl2 = 2(SCl) = SCl

CH2O

N2 = 2N = N

C2H4 = 2(CH2) = CH2

In a sealed container, there is a 1.6 mol sample of ideal gas. the temperature of the room is 22 C and the volume of the container is 1 L. How much pressure is built up in this container?

Ideal Gas Law is PV = nRt where R = .0821

P * 1L = 1.6mol *.0821 * (273+22)

P = 38.75 atm

What is the [H3O+] (molarity) of a 0.1250 M ethanolamine?

HOC2H4NH2 + H2O ↔ HOC2H4NH3+ + OH- Kb = 3.20e-5

[OH-] = SQRT(0.1250 * 3.20e-5) = 4.00 x 10^-6 M

Kw = [H+] [OH-]

1.00 x 10^-14 = [H+] (4.00 x 10^-6)

[H+] = 2.50 x 10^-9 M

More info

Determine the number of atoms or molecules in each of the following substances. 1. 0.30 mol F 2. 0.70 mol iron 3. 4.0 mol Na 4. 4.0 mol NH3

Determine the number of atoms or molecules in each of the following substances.
1. 0.30 mol F 
2. 0.70 mol iron
3. 4.0 mol Na
4. 4.0 mol NH3


A mole is simply 6.02x10^23 atoms/molecules/particles/anything, so to figure out how many atoms are in each of those amounts of moles, you need only multiply the number of moles by 6.02x10^23, and then round to the appropriate number of sig figs.

1. .30 * 6.02x10^23 = 1.8x10^23 atoms F.
2. .70 * 6.02x10^23 = 4.2x10^23 atoms Fe.
3. 4.0 * 6.02x10^23 = 2.4x10^24 atoms Na
4. 4.0 * 6.02x10^23 = 2.4x10^24 molecules NH3

It's just like how a dozen is 12. To have a dozen of anything is to have 12 of anything. To have 4 dozen of anything is to have 48 of anything. That's why 4 moles of Na and 4 moles of NH3 come out to be the same number.

Acct 387 Chp 15 16 Solution

Acct 387                                           Q1A-IC (Chap. 15 -16)                      Name_Solution___

Spring                                                 Given in Class 1/31

Doran                                                                                                                                   Group#                            

Total of 16 points.

Part I. Multiple Choice (Circle the Best Answer) 2 points each

1. Presented below is information related to Getty Corporation:

     Subscriptions Receivable, Common Stock                                $   120,000

     Common Stock, $1 par                                                                     3,600,000

     Common Stock Subscribed                                                                240,000

     Paid-in Capital in Excess of Par—Common Stock                         210,000

     Preferred 8 1/2% Stock, $50 par                                                     1,200,000

     Paid-in Capital in Excess of Par—Preferred Stock                        240,000

     Retained Earnings                                                                               900,000

     Treasury Common Stock (at cost)                                                        90,000

The total stockholders' equity of Getty Corporation is (Note: Assume Subscriptions receivable is treated as contr-equity)

    

     a. $6,180,000.      b. $6,270,000.           c. $6,300,000.           d. $6,390,000.

2. When a corporation issues shares of its own stock in payment for services, the least appropriate basis for recording this transaction would be

a. the fair market  value of the services received

b. the par or stated value of the shares issued.

c. the fair market value of the shares issued

d. All of the above are equally appropriate basis for recording the transaction

3. Nelsen Co. was organized on January 2, 2001, with 100,000 authorized shares of $10 par value common stock.  During 2001 Nelsen had the following capital transactions:

                  January 5—issued 75,000 shares at $14 per share.

                  July 27—purchased 5,000 shares at $11 per share.

                  November 25—sold 4,000 shares of treasury stock at $13 per share.

Nelsen used the cost method to record the purchase of the treasury shares. What would be the balance in the Paid-in Capital from Treasury Stock account at December 31, 2001?

a.  $0.                     b.  $4,000.                  c.  $8,000.                 d.  $12,000.

4. An entry is not made on the

           

a.   date of declaration.

b.   date of record.

c.   date of payment.

d.   An entry is made on all of these dates.

-Continued on Back Side-

5. A retained earnings appropriation always means the company is

    a. setting aside cash for a specific purpose.

   b. disclosing managerial policy.

    c. preventing unusual losses.

    d. improving the debt-equity ratio.

6. Stine Co. had outstanding 2,000 shares of $100 par value 8% cumulative preferred stock and 30,000 shares of $5 par value common stock on December 31, 1998.  At December 31, 1998, dividends in arrears on the preferred stock were $20,000.  Cash dividends declared in 1999 totaled $60,000.  The amounts paid to each class of stock were

                                              Preferred Stock        Common Stock

a.                                                $16,000                      $44,000

b.                                                $20,000                      $40,000

c.                                                $36,000                      $24,000

d.                                                $40,000                      $20,000

Part II. Fill in the blank  (1/2 point each)

Indicate the effect of each of the following transactions on total stockholders' equity by placing an "X" in the appropriate column.

                                                                                      Increase       Decrease        No Effect

1.    The sale of treasury stock for

less than its cost.                                               ___X___       ________       ________

2.    Not declaring this year's dividend

On cumulative preferred stock                        ________       ________       ___X___

3.    Declaration of a stock dividend.                      ________       ________       ___X___

4.    Payment of a stock dividend.                           ________       ________       ___X___

5.    Acquiring land by issuing

common stock                                                    ___X___       ________       ________

6.   Declaration of cash dividend.                          ________       ___X___       _______ 

7.   Payment of cash dividend.                              ________       ________       ___X___

8.    Conversion of bonds payable

into preferred stock                                            ___X___       ________       ________