CHEM 1010 Exam 2 Chapters 4-6

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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


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