Chem Ch 1-2 Q's
How many sublevels are contained in the second shell (n = 2) of a given atom?
2
What value of l is represented by a d orbital?
2
How many protons are in titanium?
22
An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element?
28.085 amu
How many different values of m(l) are possible in the 2p sublevel?
3
Calculate the energy of the orange light emitted, per photon, by a neon sign with a frequency of 4.89 × 1014 Hz.
3.24 × 10^-19 J
An FM radio station broadcasts electromagnetic radiation at a frequency of 91.5 MHz. The wavelength of this radiation is ________ m.
3.28
How many iron atoms are contained in 354 g of iron?
3.82 x 10^24 Fe atoms
A new element was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope?
345.55
How many subshells are there in the shell with n = 4?
4
Calculate the energy of the violet light emitted by a hydrogen atom with a wavelength of 410.1 nm.
4.85 × 10^-19 J
Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 1014 Hz.
436 nm
Consider a hypothetical element X that consists of two isotopes, one with a mass of 41.99998 amu and the other with a mass of 44.99987 amu. Their percent abundances are 33.3333% and 66.6667%, respectively. Without doing an actual calculation, the mass closest to the atomic mass of X is ______.
44.0 amu
Give the numbers for ml for an s orbital.
0
Give all possible values of l for a n=5 sublevel.
0, 1, 2, 3, 4
What is the maximum number of s orbitals that are possible in a given shell?
1
What mass (in mg) does 2.63 moles of nickel have?
1.54 x 10^5 mg
How many photons are contained in a burst of yellow light (589 nm) from a sodium lamp that contains 609 kJ of energy?
1.80 × 10^24 photons
Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?
106.905 amu
What total energy (in kJ) is contained in 1.0 mol of photons, all with a frequency of 2.75 × 1014 Hz?
110 kJ
The atomic mass for cadmium is
112.41
Describe the shape of a p orbital.
dumbbell shaped
Rank in the order of increasing mass.
electron, proton, neutron
Identify the color that has a wavelength of 540 nm.
green
A sample of a compound containing only carbon and oxygen decomposes and produces 24.50g of carbon and 32.59g of oxygen. What is the sample?
5.12 moles
How many moles of potassium are contained in 200 g of potassium?
5.12 moles
An atom of 128Xe contains ________ electrons.
54
The atomic mass for iron is
55.85
What is the frequency of light with a wavelength of 0.440 μm?
6.81 × 10^14 sec^-1
Calculate the wavelength (in nm) of a the red light emitted by a neon sign with a frequency of 5.00 × 1014 Hz.
600 nm
What are isotopes?
Isotopes are atoms with the same number of protons but different numbers of neutrons.
24 Na 11
Np, Nn = 11,13 protons, neutrons
13 N 7
Np, Nn = 7,6 protons, neutrons
196 Au 79
Np, Nn = 79,117 protons, neutrons
208 Po 84
Np, Nn = 84,124 protons, neutrons
An atom that has an atomic number of 38 and a mass number of 88 is an isotope of an atom that has
an atomic number of 38 and a mass number of 86.
Gallium has two naturally occurring isotopes with the following masses and natural abundances: Isotope Ga−69 Ga−71 Mass (amu) 68.92558 70.92470 Abundance (%) 60.108 39.892
atomic mass = 69.723 amu
Identify the element that has an atomic number of 80. a) neodymium b) mercury c) bromine d) nickel
b) mercury
All of the following will lead to a homogeneous mixture EXCEPT a) sugar and coffee b) mud and water c) ice tea and lemonade d) salt and water e) vinegar and water
b) mud and water.
What element is defined by the following information? p+ = 17 n° = 20 e- = 17
chlorine
Identify the correct values for a 1s sublevel.
n = 1, l = 0, ml = 0
Identify the correct values for a 3p sublevel.
n= 3, l = 1, ml = 0
What is percent natural abundance?
percentage of abundance of isotopes
Which of the following visible colors of light has the longest wavelength?
red
What are the possible orbitals for n = 3?
s, p, d
Describe the shape of a s orbital.
spherical
Which of the following occur as the wavelength of a photon increases?
the frequency decreases
As the wavelength of electromagnetic radiation increases _______.
the frequency decreases and the energy per photon decreases