Quiz1_ARC

Question 1

He discovered the nucleus with his “Gold Foil” experiment.

Answer 1

Ernest Rutherford

Question 2

He is credited with the discovery of electron in an atom.

Answer 2

J.J. Thomson

Question 3

Which of the following is an intensive property?
A. mass
B. density
C. volume

Answer 3

density

Question 4

Which of the following is an extensive property?
A. weight
B. density
C. melting point

Answer 4

weight

Question 5

Brass is an example of ___________.

Answer 5

Homogenous mixture

Question 6

Methane is an example of __________.

Answer 6

Compound

Question 7

Which of the following is not an example of observable physical property?

Answer 7

mass

Question 8

It is the number of proton in nucleus.

Answer 8

Atomic number

Question 9

Atoms of the same element with varying number of neutrons.

Answer 9

Isotopes

Question 10

He arranged the elements in the periodic table in groups of 3’s or triads also known as “Law of Triad”.

Answer 10

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”.

Answer 11

John Newlands

Question 12

He formulated the Periodic Law.

Answer 12

Dmitri Mendeleev

Question 13

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

Answer 13

solvent

Question 14

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

Answer 14

saturated solution

Question 15

A solution that completely dissolves, leaving no remaining substances.

Answer 15

unsaturated solution

Question 16

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

Answer 16

supersaturated solution

Question 17

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 17

Mg > Ca > K > Fr

Question 18

Which of the following elements is more electronegative: Cl, S, or Mg?

Answer 18

Cl

Question 19

Which of the following elements is more reactive: Li, Rb, or Fr?

Answer 19

Fr

Question 20

The seven horizontal rows in the periodic table are called __________.

Answer 20

periods

Question 21

Group 7A is a family of _______.

Answer 21

Halogens

Question 22

Which of the following elements (Br or Cu) has the higher ionization energy?

Answer 22

Br

Question 23

Which has a larger ionic size ( Na + or Mg 2+)

Answer 23

Na +

Question 24

Calculate the % Ca in Ca(OH)2.

Answer 24

54.09%

Question 25

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

Answer 25

H2SO4

Question 26

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

Answer 26

Al2O3

Question 27

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 27

C4H8

Question 28

Agua regia is a/an ______.

Answer 28

solution

Question 29

Sodium carbonate is also known as?

Answer 29

soda ash

Question 30

It is the most ideal gas element.

Answer 30

Helium

Question 31

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

Answer 31

C6H6

Question 32

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 32

0.256 M

Question 33

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

Answer 33

0.380 m

Question 34

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 34

0.0253

Question 35

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 35

33.87%