Chemistry exam 2 - practice exam

Complete the following nuclear equation: (206/81)Tl->(206/82)Pb+?

(0/-1)e

Complete the following nuclear equation: (210/84)Po->?+(4/2)He

(206/82)Pb

Complete the following nuclear equation: ?->(218/85)At+(0/-1)e

(218/84)Po

Which of the following nuclear equations correctly describes alpha emission?

(238/92)U->(234/90)Th+(4/2)He

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 & -The reactors can be used to produce their own fuel

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 1/8 the original amount of carbon-14 in it. How old is the sample?

17,200 years

The number of nonbonding pairs in the water molecule is________

2

Which of the following is the correct electron dot structure for carbon(atomic #=6)?

4 half-full spots

If you mix a typical iodine ion (I, atomic #=53) with a typical barium ion (Ba, atomic #=56), what compound is formed?

BaI2

Which of the following atons has the smallest atomic radius? I, Br, At, F, Cl

F

Which element has the atomic # 12? Na, Mg, C, Be, B?

Mg

Which of the following elements will most likely form an ion with a +2 charge? Na, Si, Ne, Mg, Cl

Mg

List the following bonds in order of increasing polarity

N-N < N-O < N-F < H-F

Which of the following experiments helped to determine the charge of an electron and (indirectly) its mass?

R. Millikan's oil drop experiments

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 1 neutron and 1 proton

If 3 samples have the half-lives listed below, which is the most radioactive? "hours, million years, minutes, years"

a sample with a half-life of 20 minutes

What is the name for the following polyatomic ion? CH3CO2-

acetate

The following statement describes which subatomic particle best? "It is located outside of the nucleus"

an electron

When (226/88)Ra decays by emitting an alpha particle, what is the atomic # and atomic mass of the resulting nucleus?

atomic # = 86; atomic mass = 222

What is the molecular shape of the following molecule (o---š===o)

bent

Rank the following by 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

The cathode ray consists of________

negatively charged particles

Which of the following beams is due to an energetic non-visible light wave? a)positive, b)neutral, c)negative

neutral

Isotopes of the same element have a different number of________

neutrons

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 statements best describes the strong nuclear force?

the force is very strong but has a very short range

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

Which of the following has the longest wavelength? "shortest space between each top of wave or widest space between each top of wave?"

widest space

How many covalent bonds would the following generic atom usually form?(all spots full)

would usually not form any covalent bonds