Chemistry - General Chemistry; Pre Quiz 2

1

Which, if any, of the following metals would be capable of acting as a sacrificial anode when used with iron pipe? <img src="https://sciemce.com/files/4/ppg__tttt0824190942__f1q292g1.jpg" alt="" style="vertical-align: 0.0px;" height="30" width="171" />

2

The formula PO43- means that this ion is composed of

3

In each of the sets below, choose the one quantity or number which is exact.a.i.the human populationii.the distance in light years from the sun to Alpha Centauri, a nearby stariii.the winning time for the 100 m dash in the Olympic Gamesb.i.the weight of a particular one cent coin in gii.the boiling point of lead, in °Ciii.the number of cm in 1 ydc.i.the measured value of the speed of light (2.998 × 108 m/s)ii.π (3.141)iii.the volume of milk in a 1-gallon jug

4

Which of the following statements about polar molecules is false?

5

Does tyrosine contain an aromatic ring?

6

A buffer solution is prepared by mixing 250 mL of 1.00 M HNO2 with 500 mL of 0.500 M calcium nitrite, Ca(NO2)2 . Calculate the pH

7

Of the three major subatomic particles, the least massive is

8

Which two electron configurations represent elements that would have similar chemical properties? (1) 1s22s22p4(2) 1s22s22p5(3) [Ar]4s23d104p3(4) [Ar]4s23d104p4

9

Which of the following compounds will have the highest molar solubility in pure water?

10

The known cause of approximately 30% of all cancers is

11

Which of the following best defines what a sample preparation is?

12

In the Procedure section, you are cautioned to be sure that the opening of the vacuum adapter is kept open to the atmosphere. Why this precaution?

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Experiment 4
This experiment uses standard taper glassware for the distillation. Use of this type of apparatus is recommended over any equipment requiring connections with glass tubing and rubber stoppers. It is quick and easy to assemble and disassemble; there are no dangers in cuts resulting from tubing being improperly inserted into rubber stoppers. The instructor should examine the equipment to ensure that the connections are properly greased and secured, and that the system has an opening to the atmosphere. The system must not be closed!
The receiving flask should be thoroughly cleaned and dried before collection of the distillate. Otherwise, there will be false reporting of sodium and chloride ions from contamination. Silver nitrate will stain the skin when contact is made. Advise students to use caution in dispensing this solution. The flame test should be done in the hood since concentrated nitric acid is used for this part of the experiment.
Waste containers should be provided for collection of all halogenated solids and solutions.

13

The specific heat of water is higher than that of iron. Which of the following statements is correct?

14

Four of the following statements about the ammonia molecule, NH3, are correct. One is not. Which

15

What is the systematic name for aqueous HI?

16

Amine hydrochlorides are usually more soluble than the amine in water

17

The number of valence electrons in the propionate ion, CH3CH2COO-, is

18

The Henry's Law constant of methyl bromide, CH3Br, is k = 0.159 mol/(L ∙ atm) at 25°C. What is the solubility of methyl bromide in water at 25°C and at a partial pressure of 285. mm Hg?

19

Which statement regarding polypeptide hormones is incorrect?

20

Which of the following colors of light has the highest energy?

21

Which of these is the correct Lewis dot structure for sulfur trioxide?

in Chemistry

a.

b.
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22

What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation:5Fe2+(aq) + MnO4-(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

23

When dissolved in water, RbOH behaves as

24

A polymer made in a polymerization reaction that also produces small molecules (such as water) is classified as

25

Which of these elements has the highest first ionization energy?

26

All reactions in the human body are catalyzed by

27

Provide the name of the major alkene product that results when (2S,3R)-2,3-dibromopentane is treated with zinc in acetic acid

28

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. <img src="https://sciemce.com/files/4/ppg__tttt0824190949__f1q451g1.jpg" alt="" style="vertical-align: 0.0px;" height="111" width="540" /> Which, if any, of the following pairs are optical isomers?

29

Below is the structure of caffeine. Circle and label (a) an amide functional group, (b) a tertiary amine, and (c) the purine ring system.

30

The city of Los Angeles is now approximately 2400 miles south of Anchorage, Alaska. It is moving slowly northward as the San Andreas fault slides along. If Los Angeles is to arrive near Anchorage in 76 million years, at what average rate will it have to move in mm per month? (1 mi = 1609 m)

31

Balance the following net ionic equation. Use H+ rather than H3O+. What is the coefficient of H2S? H2S + MnO4- → SO42- + Mn2+ (acidic solution)

32

Determine the number of grams of copper present in a 4.0 kg sample of the mineral chalcopyrite (CuFeS2)

33

In a black-and-white photograph, the black area on the photographic negative represents

34

Suppose you have 100 mL of a pure liquid in a beaker on the laboratory bench. Which molecules in the liquid are the most likely to evaporate at a temperature below the boiling point of the liquid?

35

Enzymes that catalyze the same reactions but have slightly different structures are called ________

36

Two key amino acids in the transfer or catabolism of amino groups are

37

CaCl2 is an example of a(n):

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Chemistry - General Chemistry; Pre Quiz 2

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