Practice Final Exam w/ Week 16: Gases

Question 1

Find the molecular formula for glucose: 40.00% C, 6.71% H, and 53.29% O. The approximate molar mass is 180 g/mol.

Accepted Answer

C6H12O6

Question 2

How many atoms are in the explosive, trinitrotoluene (T.N.T.): C6H2(NO2)3CH3?

Accepted Answer

21

Question 3

Which statement is true about ionic solids?

Accepted Answer

Neither of these statements are true.

Question 4

What is the difference between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond is the sharing of valence electrons between adjacent atoms.

Question 5

Identify X in the nuclear reaction: 12C + 4He → X + 1n

Accepted Answer

15O

Question 6

Which kind of carbohydrate is amylose, also known as starch?

Accepted Answer

polysaccharide

Question 7

The density of carbon monoxide at STP is ________.

Accepted Answer

1.25 g/L

Question 8

If a 10¢ coin has a mass of 2.27 g and is 91.7 % copper, what is the mass of nickel in the 10¢ coin?

Accepted Answer

0.188 g

Question 9

The number of moles of helium gas present in a 2,800 mL container at 548 K and 1210 mmHg pressure is ___.

Accepted Answer

0.099 moles

Question 10

What is the electron configuration using core notation for Fe3+?

Accepted Answer

[Ar] 3d5

Question 11

What mass of iron(III) sulfide (207.90 g/mol) is produced from 0.350 g of iron and 0.150 g of sulfur?

Accepted Answer

0.324 g

Question 12

What is the pH of an aqueous solution if the [H3O+] = 0.066 M?

Accepted Answer

1.2

Question 13

What is the common name for CH3-CH2-OH?

Accepted Answer

ethanol

Question 14

What are the products from the following single-replacement reaction: Al + Fe2O3 → ?

Accepted Answer

Fe + Al2O3

Question 15

Which of the following formulas may be attributed to an amide?

Accepted Answer

C4H9NO

Question 16

Draw the structural formula for carbon dioxide, CO2, and state the type of bonds in a carbon dioxide molecule.

Accepted Answer

All double bonds.

Question 17

How is an "atomic fingerprint" formed?

Accepted Answer

excited electrons falling to lower energy levels

Question 18

A fixed amount of a gas has both its temperature and volume quadrupled. What happens to its pressure?

Accepted Answer

Pressure remains the same

Question 19

Which type of matter is correctly identified?

Accepted Answer

Air is a homogeneous mixture of gases.

Question 20

Which physical change is correctly identified?

Accepted Answer

Mothballs disappear via sublimation.

Question 21

Which of the following chemical substances would you expect to exhibit the greatest degree of hydrogen bonding?

Accepted Answer

methyl amine, CH3NH2

Question 22

0.750 moles of helium gas will occupy a volume of ________ at STP.

Accepted Answer

16.8 L

Question 23

Which of the following is a general property of an basic solution?

Accepted Answer

turns litmus blue

Question 24

Which of the following may be classified as a natural biopolymer?

Accepted Answer

protein

Question 25

What is the mass of 3.75 × 1024 molecules of oxygen gas, O2?

Accepted Answer

199 g

Question 26

Liquid nitrogen boils at 77 K. What is the boiling point on the Celsius scale?

Accepted Answer

-196 oC

Question 27

What substance is reduced in the following redox reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)?

Accepted Answer

Cu+2

Question 28

What is the molecular shape of a hydrogen sulfide molecule, H2S?

Accepted Answer

bent

Question 29

The density of methyl alcohol is 0.792 g/mL. What is the volume of 45.5 g of methyl alcohol?

Accepted Answer

57.4 g

Question 30

Predict the formula of the compound produced in a reaction between sodium (Na) and nitrogen (N).

Accepted Answer

Na3N

Question 31

How many resonance forms are in the nitrite ion, NO2-1?

Accepted Answer

2

Question 32

Based only on intermolecular attraction, predict which of the following liquids has the lowest boiling point.

Accepted Answer

CH3CH2CH2CH2CH3

Question 33

What is the oxidation state of manganese in the compound KMnO4?

Accepted Answer

+7

Question 34

Which statements about nuclear rays matches its ability to penetrate various human tissues or bone?

Accepted Answer

All statements are correct.

Question 35

A truck has a mileage rating of 5.8 km/L. What is the rating in miles per gallon? Given: 1 mi = 1.61 km, 1 gal = 3.78 L.

Accepted Answer

14 mpg

Question 36

Which of the following unbranched hydrocarbons is saturated?

Accepted Answer

C6H14

Question 37

Which pairs of atoms have the same number of valence electrons? (Hint: Same family = same valence electrons.)

Accepted Answer

Ar and Kr

Question 38

How many covalent bonds can an element of Group 14 form with other elements?

Accepted Answer

4

Question 39

What volume of 18 M sulfuric acid must be diluted with distilled water to prepare 600.0 mL of 1.50 M H2SO4?

Accepted Answer

50 mL

Question 40

What is the mass of sodium chloride (58.44 g/mol) dissolved in 0.500 L of 0.300 M NaCl solution? (1 L = 1000 mL)

Accepted Answer

8.77 g

Question 41

The name of the bond that combines two sugars together is called ________.

Accepted Answer

glycoside linkage

Question 42

What mass of sodium releases 2.68 L of hydrogen gas at STP from HCl? Given: 2 Na + 2 HCl → 2 NaCl + 1 H2

Accepted Answer

5.50 g

Question 43

Which of the following conjugate pairs would form a poor buffer?

Accepted Answer

Both are poor buffers.

Question 44

Which of the following instruments has the most uncertainty?

Accepted Answer

beaker, ± 20 mL

Question 45

The precipitate formed when ammonium chloride and silver nitrate are placed in a test tube is ________.

Accepted Answer

silver chloride

Question 46

Which element, isotope, or ion contains 55 protons, 80 neutrons, and 54 electrons?

Accepted Answer

135Cs+1

Question 47

What is the difference between a theory and a law?

Accepted Answer

Both answers are correct.

Question 48

Which of the following are chemical changes?

Accepted Answer

All of these are chemical changes.

Question 49

Which of the following pairs of elements exhibit similar properties? (Hint: same family = same properties.)

Accepted Answer

All of them.

Question 50

What is the difference between a chemical reaction and a nuclear reaction?

Accepted Answer

A nuclear reaction is the only way to change an element to another.

Question 51

Apply the "like dissolves like" rule to predict which of the following liquids does not mix with water, H2O.

Accepted Answer

toluene, C6H5CH3

Question 52

Which statement is correct about metals and nonmetals concerning their valence electrons when becoming ions?

Accepted Answer

Nonmetals gain valence electrons to create negatively charged anions.

Question 53

A student prepares 2.71 g of Tylenol. If the calculated mass of Tylenol is 3.55 g, what is the percent yield?

Accepted Answer

76.3%

Question 54

After balancing the reaction C3H8 + O2 → CO2 + H2O the correct coefficients are respectively ________.

Accepted Answer

1:5:3:4

Question 55

Which of the following is a strong electrolyte when dissolved in distilled water?

Accepted Answer

potassium iodide

Practice Final Exam w/ Week 16: Gases

Questions 55

Practice Final Exam w/ Week 16: Gases

Questions 55