General Chemistry

Question 1

Which of the following is not an example of observable physical property?
a. color
b. mass
c. texture
d. odor

Answer 1

b. mass

Question 2

Which of the following is an intensive property?
a. mass
b. density
c. volume
d. none of these

Answer 2

b. density

Question 3

Which of the following is an extensive property?
a. weight
b. density
c. melting point
d. none of these

Answer 3

a. weight

Question 4

Brass is an example of _________.
a. Element
b. Compound
c. Homogenous mixture
d. Heterogenous mixture

Answer 4

c. Homogenous mixture

Question 5

Methane is an example of __________.
a. Element
b. Compound
c. Homogenous mixture
d. Heterogenous mixture

Answer 5

b. Compound

Question 6

He discovered the nucleus with his “Gold Foil” experiment.
a. Eugen Goldstein
b. J.J. Thomson
c. Ernest Rutherford
d. John Dalton

Answer 6

c. Ernest Rutherford

Question 7

He is credited with the discovery of electron in an atom.
a. Eugen Goldstein
b. J.J. Thomson
c. Ernest Rutherford
d. John Dalton

Answer 7

b. J.J. Thomson

Question 8

It is the number of proton in nucleus.
a. Valence
b. Atomic charge
c. Atomic mass
d. Atomic number

Answer 8

d. Atomic number

Question 9

Atoms of the same element with varying number of neutrons
a. isotopes
b. ions
c. element
d. none of these

Answer 9

a. isotopes

Question 10

He arranged the elements in the periodic table in groups
of 3’s or triads also known as “Law of Triad”.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer

Answer 10

a. Johann Wolfgang Dobereiner

Question 11

He arranged the elements in the periodic table in groups of 8’s like from lithium to sodium also known as “Law of Octaves”.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer

Answer 11

b. John Newlands

Question 12

He formulated the Periodic Law.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer

Answer 12

c. Dmitri Mendeleev

Question 13

The seven horizontal rows in the periodic table are called
__________.
a. groups
b. periods
c. families
d. valence

Answer 13

b. periods

Question 14

Group 7A is a family of _______
a. Alkali Metals
b. Halogens
c. Noble gases
d. Alkaline Metals

Answer 14

b. Halogens

Question 15

It is the most ideal gas element.
a. Helium
b. Oxygen
c. Sulfur
d. Neon

Answer 15

a. Helium

Question 16

Which of the following is arranged in increasing atomic size?
a. Mg > Ca > K > Fr
b. Mg > Sc > Sr > Ca
c. Ca > Mg > K > Sr
d. Ca > K> Mg > Fr

Answer 16

a. Mg > Ca > K > Fr

Question 17

Which of the following elements is more electronegative:
Cl, S, or Mg?
a. Cl
b. S
c. Mg
d. none of these

Answer 17

a. Cl

Question 18

Which of the following elements is more reactive: Li, Rb, or Fr?
a. Li
b. Rb
c.Fr
d. none of these

Answer 18

c.Fr

Question 19

Which of the following elements (Br or Cu) has the
higher ionization energy?
a. Cu
b. Br
c. Both elements
d. None of these

Answer 19

b. Br

Question 20

Which has a larger ionic size (𝑁𝑎+ 𝑜𝑟 𝑀𝑔2+)
a. 𝑁𝑎+
b. 𝑀𝑔2+
c. Both ions
d. None of these

Answer 20

a. 𝑁𝑎+

Question 21

Calculate the % Ca in 𝐶𝑎(𝑂𝐻)2.

Answer 21

54.09%

Question 22

What is the empirical formula of a compound which contains 2.05% H, 32.65% S, and 65.30% O?

Answer 22

H2𝑆𝑂4

Question 23

What is the empirical formula of a compound which
contains 52.94% Al and 47.06% O?

Answer 23

𝐴𝑙2𝑂3

Question 24

A compound is 85.69% C and 14.31% H. If the molar mass is 56g/mol, what is the molecular formula of the compound?

Answer 24

𝐶4𝐻8

Question 25

What is the molecular formula if the empirical formula of a compound is CH. The molar mass of this compound is 78 g. a.𝐶2𝐻2 b.𝐶6𝐻6 c.𝐶8𝐻8 d.None of these

Answer 25

𝐶6𝐻6

Question 26

A substance that has the ability to dissolve or disperse one or more substances?

Answer 26

solvent

Question 27

A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom.

Answer 27

saturated solution

Question 28

A solution that completely dissolves, leaving no remaining substances.

Answer 28

unsaturated solution

Question 29

A solution that contains more undissolved solute than the saturated solution because of its tendency to crystallize and precipitate.

Answer 29

supersaturated solution

Question 30

Agua regia is a/an ______. a. solution b. colloid c. spension d. all of these

Answer 30

a. solution

Question 31

Consider 5g of sugar dissolved in 20g of water. What is the w/w % concentration of sugar in this solution?

Answer 31

20%

Question 32

A solution is prepared by dissolving 25 mL ethanol in enough water to make a 200 mL of solution. What is the concentration of the ethanol in the solution?

Answer 32

12.5

Question 33

What are the mole fraction of the components of the solution formed when 92 g glycerol is mixed with 90 g water? (MW of water = 18, MW of glycerol = 92)

Answer 33

glycerol =0.17 water = 0.83

Question 34

What is the molarity of a solution containing 32g of NaCl (58.44 g/mol) in 3.4 liters?

Answer 34

0.16 M

Question 35

What is the molality of a solution containing 0.46 mole of solute in 2.0 kg water?

Answer 35

0.23 M

Question 36

What is the molarity of a solution formed from 6.75 g of NaCl (58.4 g/mol) dissolved in water to make a solution with a total volume of 452 mL?

Answer 36

0.256 M

Question 37

Calculate the molality of a solution prepared from 29.1 g of toluene (92 g/mol) dissolved in 832 g of benzene.

Answer 37

0.380

Question 38

If a mixture of gases contains 7.50 g of 𝐻2, 3.25 g of 𝑂2 and 5.55 g of 𝑁2, what is the mole fraction of the oxygen gas?

Answer 38

0.026

Question 39

A solution is prepared by dissolving 464 g of NaOH (40 g/mol) in water and then diluting to 1 L. The density of the resulting density is 1.37 g/mL. What is the % mass of NaOH?

Answer 39

33.87%

Question 40

Sodium carbonate is also known as?

Answer 40

soda ash