CHEM 1010 Exam 2 Chapters 4-6
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 years
What is a molecule?
A group of atoms that are held together by covalent bonds
Hydrogen-2
A hyrdrogen with one neutron and one proton
What is the name for the following polyatomic ion? CH3CO-2
Acetate
IF you mix a typical iodine ion with atypical barium ion, what compound is formed?
BaI2
What is the molecular shape of the following molecule? O-S--O
Bent
Which of the following atoms has the smallest atomic radius?
F
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 atom has the atomic number 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
A 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 and indirectly its mass?
R.Milikan'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, 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 nonbonding 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 and the wavelength of light is larger than the atom and is not reflected.
If three samples have the half-lives listed below, which is the most radioactive?
a sample with a half-life of 20 minutes
It is located outside of the nucleus
an electron
