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WorksheetsCh 3 Review
Total questions: 35
Worksheet time: 18mins
In Rutherford’s Gold Foil experiment, since most particles fired at metal foil pass through the foil, it may be concluded that . . .
atoms are mostly empty space
atoms contain no charged particles
electrons form the nucleus
atoms cannot be divided into smaller particles
In Rutherford’s Gold Foil experiment, since few positively-charged particles bounce back from the metal foil, it may be concluded that . . .
atoms cannot be divided into smaller particles
electrons make up the center of the atoms
an atom is positively charged
an atom contains a small, dense, positively charged nucleus
The nucleus of the atom contains nearly all the atom's mass.
True
False
The nucleus of the atom takes up nearly all the space in the atom.
True
False
An atom is electrically neutral because . . .
neutrons balance the protons and electrons
nuclear forces equalize the charges
the number of protons and electrons is equal
the number of protons and neutrons is equal
The smallest unit of an element that is still that element is the ___.
proton
electron
nucleus
atom
What defines an atom to be an atom of gold?
It has 79 protons
It has 79 electrons
It has 118 neutrons
It has a mass number of 197
Isotopes are atoms of the same element that have different ___.
only the number of electrons
only the number of neutrons
only the mass numbers
both number of neutrons and mass numbers
The mass number of an isotope tells ___.
number protons + electrons
number protons + neutrons
number neutrons + electrons
number neutrons X 2
Can the mass number for an isotope be found on the periodic table?
Yes
No
An atomic number of 8 indicates that there are 8 _____.
protons in the nucleus of the atom
different isotopes of that element
moles per gram of that element
grams per mole of that element
The total number of protons and neutrons in the nucleus of the atom is ____.
the atomic number
Avagadro’s numbe
the mass number
equal to the number of electrons
The term “molar mass” is the same as the term _____.
mass number
atomic number
average atomic mass
none of the above
What is the mass of 1 mole of an element?
6.02 X 1023 g
1 g
12 g
it depends on what element it is
Which pair is/are the same size and mass as each other?
electron and proton
electron and neutron
proton and neutron
electron and nucleus
What particles in an atom are largest?
protons
neutrons
electrons
protons and neutrons are equally the largest
Zinc has an atomic number of 30. Is it reasonable for an isotope of it to have a mass number of 32?
Yes
No
Zinc has an atomic number of 30. Is it reasonable for an isotope of it to have a mass number of 64?
Yes
No
How many items in a mole?
6.02 X 1023
A number equal to the average atomic mass of the element
A number equal to the atomic number of the element
The number is too big to ever have a mole of something
What are the proper units for molar mass?
moles
grams
grams / 1 mole
moles / 1 gram
What are the proper units for average atomic mass?
moles
grams
grams / 1 mole
moles / 1 gram
The atomic number tells you the number of protons of an element.
True
False
The atomic number tells you the number of protons + neutrons of an element.
True
False
The atomic number tells you the number of electrons in a neutral atom of an element.
True
False
The atomic number indicates what element it is.
True
False
Other than when the number of moles is initially given in a problem, what number is always glued to moles?
1
6.02 x 1023
the atomic number
the molar mass
Other than when the number of atoms is initially given in a problem, what number is always glued to atoms?
1
6.02 x 1023
the atomic number
the molar mass
In the calculation problems with moles and grams, where do you get the correct number for grams?
It is always a 1
It is always 6.02 x 1023
It is the atomic number from the periodic table
It is the molar mass from the periodic table
The electrons in an atom are positively charged.
True
False
The neutrons in an atom are negatively charged.
True
False
The electrons of the atom contain nearly all the atom's mass.
True
False
What mass of 1 mole of gold atoms?
79 grams
About 197 grams
6.02 x 1023 grams
That information isn't on the periodic table
In the calculation problems that we've done, what number and units belong where the *** are?
It is always a 1 with no units
It is always a 1 with units that match what we want to find
It is always a 1 with units that match the units above it
It is always a 0
In the calculation problems that we've done, what units belong where the *** are?
It is always a 1 with no units
The units must match what we need to find
The units must match the units below it
The units must match the units of what was originally given
In the calculation problems that we've done, if moles are mentioned, how many sets of parenthesis are needed?
It could be either one, depending on the situation
