Chemistry Chapter 3 Atoms Question Preview (ID: 11476)


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What is the molar mass of the element oxygen?
a) 16
b) 11
c) 19
d) 13

What part of the atom was discovered as a result of Rutherford\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s gold foil experiments?
a) electrons
b) isotope
c) nucleus
d) energy levels

What is the SI base unit used to measure the amount of a substance
a) Kelvin
b) mole
c) meter
d) kilogram

What is the overall charge of an unreacted atom?
a) negative
b) positive and negative
c) positive
d) neutral

The law of _______ states that a compound is always composed of the same elements in the same proportion by mass.
a) conservation of energy
b) multiple proportions
c) definite proportions
d) conservation of mass

The isotope uranium-235 has 92 protons and 143 electrons. What, then, is its mass number?
a) 92
b) impossible to determine
c) 143
d) 235

The charge of an electron is what?
a) -2
b) -1
c) 0
d) -1

According to Bohr\'s model of the atom, electrons behave like what?
a) planets orbiting the sun
b) planets rotating on their axes
c) light energy in a vacuum
d) waves on a vibrating string

Atoms of elements that are in the same group have the same number of what?
a) protons
b) neutrons
c) valence electrons
d) protons and electrons

According to modern atomic theory, it is nearly impossible to determine an electron's exact _________.
a) color
b) position
c) charge
d) mass

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