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- # this is a comment is a Q&A file
-
- .Chemical and Molecular Science
-
- #This first number is the number of questions:
-
- 30
-
- #now are the questions
-
- #31
- M:1 3
- <
- What kind of charge does an electron
- have?
- >
- 1. negative.
- 2. positive.
- 3. neutral.
-
-
- #32
- M:2 3
- <
- A standard atom has the same number of
- protons neutrons and electrons. What do
- you call an atom with a different number
- of neutrons than the number of protons?
- >
- 1. a polymer.
- 2. an isotope.
- 3. a charged atom.
-
- #33
- M:3 3
- <
- A standard atom has the same number of
- protons neutrons and electrons. What
- do you call an atom that has given up
- or received extra electrons?
- >
- 1. a polymer.
- 2. an isotope.
- 3. an ion.
-
-
-
- #34
- M:2 2
- <
- If an atom obtains an extra electron, is
- the atom positively charged or
- negatively charged?
- >
- 1. positively.
- 2. negatively.
-
-
- #35
- Y:Y
- <
- Are the electrons that orbit the atom's
- nucleus the same type of electrons that
- run the power lines in our homes and
- offices?
- >
-
-
- #36
- M:3 4
- <
- Just like inches are a unit of
- measurement for length, there is a
- unit of measurement for charge. What is
- the unit of measurement?
- >
- 1. Watt.
- 2. Hertz.
- 3. Coulomb.
- 4. Volt.
-
-
- #37
- M:2 3
- <
- What is the charge of an electron?
- >
- 1. 0.00000000016 coulombs.
- 2. 0.00000000000000000016 coulombs.
- 3. 0.0000000000000000000000016 coulombs.
-
-
- #38
- M:3 4
- <
- If oxygen has 16 protons, what number of
- electrons would we expect to see around
- that atom?
- >
- 1. 4.
- 2. 8.
- 3. 16.
- 4. 18.
-
- #39
- M:3 3
- <
- What common household chemical is NH3?
- >
- 1. salt.
- 2. soap.
- 3. ammonia.
-
-
- #40
- M:2 3
- <
- Chemistry is the study of:
- >
- 1. chemical bonds in atoms.
- 2. all forms of matter.
- 3. chemical reactions.
-
-
- #41
- M:2 3
- <
- Atoms are so small that it would
- take an enormous amount to make a
- line one inch long if you lined them
- up in a row. How many do you think
- it would take?
- >
- 1. 100,000.
- 2. 100 million.
- 3. 100 billion.
-
-
- #42
- M:1 4
- <
- Atoms actually consist of 4 things even
- though we know there are only three
- kinds of particles: protons, neutrons
- and electrons. The fourth thing is the
- most abundant of all, taking up
- 9999/10000 of all the space in an atom.
- What is this huge 4th thing?
- >
- 1. empty space.
- 2. neutrinos.
- 3. latinos.
- 4. submarinos.
-
-
- #43
- M:1 3
- <
- When a chemist refers to an element's
- atomic number, he/she is really
- referring to the:
- >
- 1. number of protons in a neutral atom.
- 2. number of neutrons in a neutral atom.
- 3. number of electrons in a neutral atom.
-
-
- #44
- M:1 3
- <
- If we say a proton and neutron both
- weigh 1 each, then the number called
- the atomic weight is calculated by
- adding the number of protons and
- neutrons in the nucleus of an atom.
- Why then is the number usually not
- an integer?
- >
- 1. atomic mass averages in isotopes.
- 2. electrons are also factored in.
- 3. things weigh more when moving.
-
-
- #45
- Y:Y
- <
- If you know the atomic number, can you
- make a ballpark guess at the atomic
- weight?
- >
-
- #46
- M:4 4
- <
- There are 5 shells or orbitals that
- electrons can occupy in an atom. What
- is the maximum number of electrons that
- can occupy the outer most shell of any
- atom?
- >
- 1. 2.
- 2. 6.
- 3. 8.
- 4. 50.
-
-
- #47
- M:1 4
- <
- How many elements are known to exist
- in the world?
- >
- 1. 109.
- 2. 4000.
- 3. 123,000.
- 4. there are millions of elements.
-
-
- #48
- M:3 3
- <
- How many isotopes (atoms with a
- different number of neutrons than the
- number of protons) are known to exits?
- >
- 1. about 100 are known.
- 2. about 1000 are known.
- 3. about 2000 are known.
-
-
- #49
- M:2 4
- <
- We know there are at least 2000
- isotopes, but how many more are there
- that we have not yet discovered?
- >
- 1. we think there are another 1000.
- 2. we think there are another 6000.
- 3. we think there are another 10,000.
- 4. we have no idea at all.
-
-
- #50
- Y:Y
- <
- is an oxygen atom with 17 neutrons
- an isotope of the oxygen atom?
- >
-
-
- #51
- M:3 3
- <
- What is the periodic table?
- >
- 1. a table showing atomic weight ratios.
- 2. a table showing the Noble gasses.
- 3. a table showing all the elements.
-
-
- #52
- M:2 2
- <
- The Noble gasses are all atoms with the
- outer shell filled with electrons.
- Knowing that hydrogen only has one
- proton and that hydrogen is a gas, would
- you predict that hydrogen is a Noble
- gas?
- >
- 1. yes.
- 2. no, hydrogen only has one electron.
-
-
- #53
- M:3 3
- <
- Which of the following is not a Noble
- gas?
- >
- 1. He (the element helium).
- 2. Ne (the element neon).
- 3. O (the element oxygen).
-
-
- #54
- M:4 4
- <
- What does it mean when an atom like Na
- (sodium) is written 'NA++'?
- >
- 1. the atom is positively charged.
- 2. the atom is missing two electrons.
- 3. the atom is in an ionic state.
- 4. all of the above.
-
-
- #55
- M:3 3
- <
- What is one way to make a stable atom
- with all it's electrons into an ion
- (an ion is an atom with either missing
- or extra electrons)?
- >
- 1. heat the electron.
- 2. put light on the electron.
- 3. both of these.
-
-
- #56
- M:1 3
- <
- Is an ion like NH3+++ that is missing
- 3 electrons more likely to bond with
- another ion that has 2 extra electrons
- or three extra electrons?
- >
- 1. the one with three extra electrons.
- 2. the one with two extra electrons.
- 3. it will not bond with either.
-
-
- #57
- M:5 5
- <
- If we know that the computer in front
- of you is made up of atoms, and we know
- that atoms have the same number of
- protons as electrons, then what general
- thing do we know about the overall
- computer?
- >
- 1. it has equal protons & electrons.
- 2. it has many many positive charges.
- 3. it has many many negative charges.
- 4. all positives & negatives cancel out.
- 5. all of the above.
-
-
-
- #58
- M:1 3
- <
- Ionic chemicals are named using suffixes
- like ide (as in hydrogen peroxide), ite
- (as in the ion nitrite) and ate like the
- ion sulfate. What does the ide
- represent?
- >
- 1. a binary compound (made with 2 ions).
- 2. a compound made with 3 ions.
- 3. a compound made with 4 or more ions.
-
-
- #59
- M:2 3
- <
- Chemists use the term radical to
- describe a special type of complex ion.
- What is this new type of ion? (In other
- words, what is a radical?)
- >
- 1. a molecule that is charged.
- 2. one ion created by two or more atoms.
- 3. a lone ion that won't bond.
-
-
- #60
- M:2 3
- <
- A 'mole' is like a dozen, only larger.
- While a dozen refers to the number 12,
- a mole refers to an enormous number.
- What is that number?
- >
- 1. 12.34 billion.
- 2. 6.022x10E23.
- 3. 8x10E40.
-