CHEM 1010 Chapters 4, 5, & 6 Exam
How many electrons are used to draw the electron-dot structure for acetylene, a covalent compound with the formula C2H2?
10
The half-life of carbon-14 is 5,730 years. A sample is found to have one-eighth the original amount of carbon-14 in it. How old is the sample?
17,200
What is a molecule?
A group of atoms that are held together by covalent bonds
What does the following element description actually mean? Hydrogen-2
A hydrogen with one neutron & one proton
If three samples have the half-lives listed below, which is the most radioactive?
A sample with the half-life of 20 mins (the shortest half life)
What is the name for the following polyatomic ion? CH3CO2-
Acetate
The following statement described which subatomic particle? It is located outside of the nucleus.
An electron.
When ^226 88 Ra decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?
Atomic number - 86. Atomic mass - 222.
Which of the beams is due to an energetic non-visible light wave?
B (straight line)
If you mix a typical iodine ion (I, atomic number 53) with a typical barium ion (Ba, atomic number 56), what compound is formed?
BaI2
Which of the following atoms has the smallest atomic radius?
F
How many dots should Carbon (atomic number 16) have around it?
Four
Rank the following by the relative amounts of energy, from most energetic to least:
Gamma rays, blue light, red light, radio waves
Which of the following statements does not describe a proton?
It orbits around the nucleus of an atom.
Which element has the atomic number of 12?
Mg
Which of the following elements will most likely form an ion with a +2 charge?
Mg
List the following bonds in order of increasing polarity
N-N, N-O, N-F, H-F
The cathode ray consists of ____
Negatively charged particles
Isotopes of the same element have a different number of ____
Neutrons
Which of the following experiments helped to determine the charge of an electron & (indirectly) its mass?
R. Millikan's oil drop experiments
What is the main technical difficulty in dealing with fusion reactions?
The amount of energy needed to overcome the electrical repulsion of the reactants is extremely high.
Which of the following is a major advantage of nuclear-fission-based power plants?
The amount of energy per kilogram of fuel is greater than any other fuel source. AND The reactors can be used to produce their own fuel.
Which of the following statements best describes the strong nuclear force
The force is very strong but has a very short range.
The number of non bonding pairs in the water molecule is___
Two
The acronym VSEPR stands for ___
Valence Shell Electron Pair Repulsion
Why can't we see atoms?
We see with light energy & the wavelength of light is larger than the atom & is not reflected
How many covalent bonds would the following generic atom usually form? (X with all dot spots taken)
Would usually not form any covalent bonds