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Ps Ch 4
Test Description: Atoms
Instructions: Answer all questions to get your test result.
1) The average atomic mass of the element cesium is about 133 u . What is the mass of 3 mol of cesium
A
399 g
B
0.133 g
C
266 g
D
133 g
2) What is the mass in grams of .75 mole of sulfur, which has a molar mass of about 32g/mol
A
16g
B
32g
C
240g
D
24g
3) Which of the following statements about the modern model of the atom is true
A
it is possible to find electrons in an atom
B
electrons can only be found in certain energy levels
C
electrons can be found between energy levels
D
electrons orbit the nucleus in definite paths
4) The word atom comes from a greek word that means
A
the name of a band
B
unable to be divided
C
the name of Eve's husband
5) Most atoms have equal numbers of
A
electrons and neutrons
B
neutrons and protons
C
protons and electrons
6) A region in which there is a high probability of finding an electron is called an
A
energy level
B
orbital
C
negative charge
7) An elements average atomic mass refers to the weighted average of the masses of all off its naturally occuring
A
elements
B
isotopes
C
compounds
D
molecules
8) The number of particles in one mole of a substance is referred to as
A
Atomic Number
B
Atomic Mass
C
Avogadro's number
9) Isotopes have the same atomic _____________ but different atomic ______________
A
mass, name
B
mother, father
C
number, mass
10) An atom gains energy by absorbing a light particle called a
A
x ray
B
photon
C
sun beam
*select an answer for all questions
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