Ps Ch 4 Question Preview (ID: 4716)


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The average atomic mass of the element cesium is about 133 u . What is the mass of 3 mol of cesium
a) 0.133 g
b) 399 g
c) 266 g
d) 133 g

What is the mass in grams of .75 mole of sulfur, which has a molar mass of about 32g/mol
a) 16g
b) 240g
c) 32g
d) 24g

Which of the following statements about the modern model of the atom is true
a) electrons can be found between energy levels
b) it is possible to find electrons in an atom
c) electrons can only be found in certain energy levels
d) electrons orbit the nucleus in definite paths

The word atom comes from a greek word that means
a) unable to be divided
b) the name of a band
c) the name of Eve's husband
d)

Most atoms have equal numbers of
a) neutrons and protons
b) protons and electrons
c) electrons and neutrons
d)

A region in which there is a high probability of finding an electron is called an
a) negative charge
b) energy level
c) orbital
d)

An elements average atomic mass refers to the weighted average of the masses of all off its naturally occuring
a) elements
b) isotopes
c) molecules
d) compounds

The number of particles in one mole of a substance is referred to as
a) Atomic Number
b) Atomic Mass
c) Avogadro's number
d)

Isotopes have the same atomic _____________ but different atomic ______________
a) mother, father
b) number, mass
c) mass, name
d)

An atom gains energy by absorbing a light particle called a
a) photon
b) sun beam
c) x ray
d)

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