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General Knowledge ?s
Miscellaneous
100
What group is also called "inert gases" and has a full outer valence shell?
Group 18, Noble Gases
100
According to modern atomic theory, it's nearly impossible to determine an electron's exact ______________.
Location
100
What's the relationship between the mole and Avogradro's constant?
There are 6.022 x 10^23 particles in 1 mole.
100
The first person to suggest that matter was made up of atoms was the Greek philospher ________________.
Democritus
100
How do we determine the molar mass of one element?
We locate the atomic mass on the periodic table and that gives us the molar mass in grams/mole.
200
Another name for group 17 on the periodic table.
Halogens
200
An atom's mass number equals the number of ___________.
Protons+Neutrons
200
What's an ion?
When an atom gains or loses an electron and becomes positively or negatively charged.
200
Whose model of the atoms compared their electrons to planets?
Bohr
200
According to Bohr's theory, an electron's path around the nucleus defines its _______________.
energy level
300
Cu, Fe, Au and Ag are all examples of these...
Transition Metals
300
The atomic number is the same as the number of ________________ in the nucleus which is the same as the number of _________________ surrouding the nucleus of the atom.
protons, electrons
300
You have 85.5 g of fluorine, which has a molar mass of approximately 19 g/mol. How many moles of fluorine do you have?
4.5 moles
300
The word "atom" comes from a Greek word that means....
"unable to be divided"
300
Dalton's atomic theory was accepted because...
He had scientific evidence to support it and Democritus didn't.
400
Name the three main groups the periodic table is divided into...
Metals, Non-metals, and Semiconductors (or Metalloids)
400
Atoms have no electric charge because they...
have an equal number of protons and electrons, therefore they're neutral.
400
You have 6.50 mol of chromium, which has a molar mass of approx. 52 g/mol. What is the mass in grams of this amount of chromium?
338 g
400
A mole is an SI unit that describes the A) electric charge of a substance B) amount of a substance C) mass of a substance
B) amount of a substance
400
This group, also known as group 2, is somewhat less reactive than group 1.
Alkaline Earth Metals
500
The elements in this group are extremely reactive because they have one valence electron that is easily removed to form a postive ion.
Alkali Metals
500
The order of elements in the periodic table is based on what?
The number of protons in the nucleus.
500
The average atomic mass of potassium is approximately 39 amu. What is the mass of 2.0 mol of potassium?
78 g
500
Valence electrons determine an atom's A) chemical properties B) period C) mass
A) chemical properties
500
Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and __________. A) atoms are made of protons, neutrons, and electrons. B) atoms can join to form molecules. C) atoms are constantly in motion.
B) atoms can join to form molecules.