WorksheetsQuiz: Average atomic mass & Electromagnetic spectrum
Total questions: 10
Worksheet time: 30mins
The atomic mass of an element is the ___.
average of the mass number and the atomic number for the element
weighted average of the masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in the nucleus
What are the steps for finding the Average Atomic Mass?
1) write given mass, 2) write given %, 3) % to decimal, 4) Mass x abundance decimal 5) Add
1) % to decimal, 2) write given %, 3)write given mass, 4) Mass x abundance decimal 5) Add
1) write given mass, 2) write given %, 3) % to decimal, 4) Mass divided by abundance decimal 5) Add
1) write given mass, 2) write given %, 3) % to decimal, 4) Mass x abundance decimal 5) Subtract
The atomic mass of an element depends upon the ___.
relative abundance of protons in that element
mass and relative abundance of each isotope of that element
mass of each isotope of that element
mass of each electron in that element
Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
Cl-35
Cl-37
Cannot be determined from the information provided.
Magnesium exists as the three isotopes shown. What is the average atomic mass of magnesium?
20.74 amu
22.56 amu
18.39 amu
24.31
What is the light that you can see called?
observatory light
ultraviolet light
visible light
infrared light
All stars are composed of a mixture of elements. When these elements are heated they emit specific amounts of electromagnetic radiation, known as an emission spectrum. Each element emits a unique, identifiable, spectrum.
Using the Bright-line emission spectrum chart below, identify the elements present in this modeled star (found in the line labeled “mixture”).
Lithium and cadmium are in the mixture. Strontium is not in the mixture.
Lithium and strontium are in the mixture. Cadmium is not in the mixture
Cadmium and strontium are in the mixture. Lithium is not in the mixture
All of the shown elements are present in the mixture.
The unknown emissions spectra belongs to the element
Hydrogen
Mercury
Neon
Sodium
If an electron moves from n=4 to n=2 it ____
absorbs energy
releases energy
