FINAL EXAM PSC1121
Completely dry air has a relative humidity of
0
The product of the alpha decay of the polonium isotope 210Po is
206Pb
The number of protons in the nucleus of the aluminum isotope 42Al is
29
The number of major accidents that have occurred at nuclear power plants is
3
A molecule that does not contain a polar covalent bond is
CI 2
An element that can form an ionic compound with oxygen is
Calcium
Most of the world's freshwater is found in
In the oceans
Protons and neutrons are held together to form nuclei by the
Increases
With increasing temperature, the solubility of a solid in a liquid
Increases
Of the following planets, the one with the most satellites is
Jupiter
The planet with the most satellites is
Jupiter
largest planet
Jupiter
Potassium forms +1 ions and sulfur forms -2 ions. The formula for potassium bromide is
K2S
Bases do not
Libérate H 2 when mixed with an active metal.
Which of the following is NOT an outer planet?
Mars
the red planet
Mars
The length of the year is shortest on __________________.
Mercury
The planet closest to the sun is _________________.
Mercury
planet furthest from Earth
Neptune
The symbol of the hydroxide ion is
OH-
A compound whose name ends in -ate always contains
Oxygen
now considered a dwarf planet
Pluto
At room temperature, bromine is a
Reddish brown liquid
Which one of the following substances is a homogeneous mixture?
Seawater
The chromate ion has the formula CrO 4 2-. The formula of tin(I) chromate is
SnCrO 4
Which of the following is a heterogeneous mixture?
Soil
The corona is the cloud of hot gases that surrounds the sun
T
The largest planet is Jupiter
T
The weakest bonds are
Van der Waals
only planet that rotates clockwise around its axis
Venus
A vertical column in the periodic table is called a
group
Which of the following is a compound?
ice
Acids do not
liberate OH- ions when dissolved in water
The composition of a star can be determined by examining its
spectrum
Protons and neutrons are held together to form nuclei by the
strong interaction
Air near the equator averages higher temperatures than air near the poles because
sunlight falls more nearly vertically at the equator than near the poles
The color of a star depends on its
temperature
A saturated solution contains
the maximum concentration of solute
A temperature inversion that acts to trap smog in localities such as Los Angeles consists of
warm air above a layer of cold air.
The Gulf Stream is an ocean current that warms the
west coast of Europe
The number of hydrogen atoms in a molecule of ammonium sulfide, (NH 4) 2 S , is
8
Tsunamis
Are caused by undersea earthquakes.
The half-life of tritium is 12.5 years. If we start out with 1 g of tritium, after 25 years there will be
1/4 g of tritium left
When the temperature of a volume of air is equal to its dew point, the relative humidity of the air is
100%
The current in a 20-ohm electric heater operated at 240 V is
12 A
Two charges, one positive and the other negative, are initially 2 cm apart and are then pulled away from each other until they are 8 cm apart. The force between them is now smaller by a factor of
16
Which of the following chemical equations is balanced?
3CuO + 2NH3 → 3Cu + 3H2O + N2
The number of neutrons in the nucleus (9:4 BE)
5
The missing number in the equation 6H 3BO 3 → H 4B 6O 11 + ( )H 2O is
6
The power rating of an electric motor that draws a current of 3 A when operated at 240 V is
720 W
Which one or more of the following statements is true in general? A) Alpha particles are less able to penetrate matter than beta particles. B) Alpha particles are better able to penetrate matter than beta particles. C) Alpha particles are less able to penetrate matter than gamma rays. D) Alpha particles are better able to penetrate matter than gamma rays.
A and C
An emulsion in which tiny oil droplets are dispersed in water is an example of
A colloid
The number of neutrons in a nucleus
Any of the above, depending on the nucleus
The individual particles in an ionic solid are held together as a result of
Electron transfer between adjacent molecules
The inner planets are made mostly of gases compressed into liquids.
F
A family of elements whose atoms react by picking up electrons is the
Halogens
A possible fuel for a fusion reactor is
Tritium
At the end of its life cycle, a typical star becomes a _________________.
White dwarf
The light the sun emits comes from
a thin gas layer at its surface
The nucleus of a helium atom is called
an alpha particle
A nucleus increases in atomic number when it emits
an electron
Sunspot cycles
are correlated with changes in the energy output of the sun.
Organic compounds
are covalent and contain carbon.
According to the periodic table, the chemical properties of the elements are periodic functions of their
atomic number
The color of the hottest stars is
blue and white
The atomic number of an element determines its
chemical behavior
With increasing temperature, the solubility of a gas in a liquid
decreases
An amorphous solid
does not melt at a definite temperature but softens gradually.
Which of the following has the lowest pH?
gastric juice
Which of the following does not describe a jet stream?
may blow in any direction
The largest number of elements are classed as
metals
Water covers
more than half the earth's surface.
An eclipse of the sun can occur
only when the moon passes directly between the earth and the sun
CFC and HCFC gases, which are widely used in refrigeration and in foam plastics, catalyze the breakdown in the upper atmosphere of
ozone
The atmosphere constituent chiefly responsible for absorbing solar ultraviolet radiation is
ozone
The sievert is a unit of
radiation dosage
