Deck 1: The Atom in Modern Chemistry

Question 1

Two elements X and Y combine to form two compounds with the following compositions
If compound 1 has the formula XY₃ then a possible formula for compound 2 is

A) XY₂
B) X₂Y₅
C) XY₄
D) X₂Yl₉
E) XY₅

Answer 1

XY₅

Question 2

Gibbsite is an aluminum ore that is composed of 34.59% Al, 3.88% H, and 61.53% O. How much aluminum can be refined from 248.0 g of Gibbsite?

A) 7.09 g
B) 22.81 g
C) 45.59 g
D) 85.78 g
E) 152.6 g

Answer 2

85.78 g

Question 3

The element zinc has two naturally occurring isotopes. The natural abundances and isotopic masses are
The atomic mass of naturally occurring zinc is

A) 112.990
B) 113.582
C) 113.904
D) 114.582
E) 114.818

Answer 3

114.818

Question 4

The element antinomy has two naturally occurring isotopes. The natural abundances and isotopic masses are
The atomic mass of naturally occurring antinomy is

A) 121.760
B) 121.904
C) 122.048
D) 122.904
E) 124.048

Question 5

If the density of the nucleus of gold is approximately 1´10¹⁵ g cm^-3 and solid gold has a density of 19.3 g cm^-3 estimate the percentage of the volume of solid gold that is "occupied" by the nucleus?

A) 2´10^-12 %
B) 2´10^-8 %
C) 2´10^-4 %
D) 2´10^-2 %
E) 2%

Question 6

In a strange and alternative universe you repeat Millikan's oil drop experiment and measure the following charges on different oil drops
Using this give your best estimate for the unit of fundamental charge in this alternative universe

A) 1.2´10^-17 C
B) 1.8´10^-17 C
C) 3.6´10^-17 C
D) 9.0´10^-17 C
E) 1.2´10^-16 C

Question 7

Which nuclide has more protons than neutrons?

A)
B)
C)
D)