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• Question 1

3 out of 3 points

 

The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific

 

 

• Question 2

3 out of 3 points

 

The statement, "There are regions beneath the Earth's crust that will always be beyond the reach of scientific investigation," is

 

 

• Question 3

3 out of 3 points

 

Which of the following is a scientific statement?

 

 

• Question 4

3 out of 3 points

 

Science and technology are

 

 

• Question 5

3 out of 3 points

 

Which of these is a scientific hypothesis (that could be proved wrong)?

 

 

• Question 6

3 out of 3 points

 

Success in science is mainly linked to emphasis on

 

 

• Question 7

3 out of 3 points

 

The language of science is

 

 

• Question 8

3 out of 3 points

 

In science, an educated guess is a

 

 

• Question 9

3 out of 3 points

 

A scientific hypothesis can be disproved with

 

 

• Question 10

3 out of 3 points

 

The scientific method is most effective in

 

 

• Question 1

3 out of 3 points

 

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is halfway to the top of its path is

 

 

• Question 2

3 out of 3 points

 

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

 

 

• Question 3

3 out of 3 points

 

A ball is thrown upward and caught when it returns. When air resistance affects the ball, compared with the initial upward speed, the speed of the ball when caught is

 

 

• Question 4

3 out of 3 points

 

A ball is thrown vertically into the air. Because of air resistance, its time coming down compared with its time going up is

 

 

• Question 5

3 out of 3 points

 

A block is dragged at constant velocity across a level surface by a force of 6 N. What is the force of friction between the block and the surface?

 

 

• Question 6

3 out of 3 points

 

Which has greater kinetic energy: a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?

 

 

• Question 7

3 out of 3 points

 

A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The average force on the post is

 

 

• Question 8

3 out of 3 points

 

A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades at 1 m/s. The girl's speed is

 

 

• Question 9

3 out of 3 points

 

Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is

 

 

• Question 10

3 out of 3 points

 

A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height?

 

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• Question 1

3 out of 3 points

 

A photovoltaic cell receives energy input primarily by

 

 

• Question 2

3 out of 3 points

 

A star that is twice as hot as another has twice the

 

 

• Question 3

3 out of 3 points

 

A poor conductor of heat is a

 

 

• Question 4

3 out of 3 points

 

A heat pump can

 

 

• Question 5

3 out of 3 points

 

A substance most commonly emits heat energy by the process of

 

 

• Question 6

3 out of 3 points

 

A pre-electronic thermostat employs a coiled

 

 

• Question 7

3 out of 3 points

 

Because a refrigerator operates by a motor, leaving the refrigerator door open for hours in a closed room

 

 

• Question 8

3 out of 3 points

 

A volume of helium gas has a temperature of 0°C. The same gas twice as hot has a temperature of

 

 

• Question 9

3 out of 3 points

 

Heat energy is measured in units of

 

 

• Question 10

3 out of 3 points

 

Entropy is most closely related to the

 

 

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• Question 1

3 out of 3 points

 

A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is

 

 

• Question 2

3 out of 3 points

 

A charged balloon illustrates that something can have a great amount of

 

 

• Question 3

3 out of 3 points

 

A proton and an electron placed in an electric field experience the same force. Which undergoes the greater acceleration?

 

 

• Question 4

3 out of 3 points

 

A negatively-charged balloon touching a wooden wall

 

 

• Question 5

3 out of 3 points

 

A rubber rod rubbed with fur becomes

 

 

• Question 6

3 out of 3 points

 

Refrigerator magnets are typically

 

 

• Question 7

3 out of 3 points

 

An iron rod becomes magnetic when

 

 

• Question 8

3 out of 3 points

 

A transformer actually transforms

 

 

• Question 9

3 out of 3 points

 

An electric motor and electric generator differ in

 

 

• Question 10

3 out of 3 points

 

Electric and magnetic fields combine to produce

 

 

•

• Question 1

3 out of 3 points

 

A sound wave and a light wave have identical

 

 

• Question 2

3 out of 3 points

 

A wave with a long wavelength has a relatively

 

 

• Question 3

3 out of 3 points

 

A beam of light emerges from water into air at an angle bent

 

 

• Question 4

3 out of 3 points

 

A distant palm tree on a hot dry day that often appears to be reflected from water is

 

 

• Question 5

3 out of 3 points

 

A changing electric field induces a changing

 

 

• Question 6

3 out of 3 points

 

"Sympathetic vibrations" refers to

 

 

• Question 7

3 out of 3 points

 

A dolphin perceives its environment by the sense of

 

 

• Question 8

3 out of 3 points

 

A mass suspended from a spring bobs up and down one complete cycle every 2 s. Its period is

 

 

• Question 9

3 out of 3 points

 

A red shift for light indicates that the light source is moving

 

 

• Question 10

3 out of 3 points

 

A mass on the end of a spring bobs up and down 1 complete cycle every 2 s. Its frequency is

 

 

•

• Question 1

3 out of 3 points

 

Elements above uranium in the periodic table do not exist in any appreciable amounts in nature because they have short half-lives. Yet there are several elements below uranium in atomic number with equally short half-lives that do exist in appreciable amounts in nature. How can you account for this?

 

 

• Question 2

3 out of 3 points

 

Complete the following nuclear equation:

 

 Po → ?? +  He

 

 

• Question 3

3 out of 3 points

 

A certain radioactive element has a half-life of one hour. If you start with a 1-g sample of the element at noon, how much of this same element will be left at 3:00 PM?

 

 

• Question 4

3 out of 3 points

 

Alpha and beta rays are deflected in opposite directions in a magnetic field because

 

 

• Question 5

3 out of 3 points

 

Complete the following nuclear equation:

 

 Tl →  Pb + ??

 

 

• Question 6

3 out of 3 points

 

An element is best described as a material

 

 

• Question 7

3 out of 3 points

 

An element found in another galaxy exists as two isotopes. If 80.0 percent of the atoms have an atomic mass of 80.00 atomic mass units and the other 20.0 percent have an atomic mass of 82.00 atomic mass units, what is the atomic mass of the element?

 

 

• Question 8

3 out of 3 points

 

How do we account for the great variety of substances in the world?

 

 

• Question 9

3 out of 3 points

 

Elements that are in the same ________ have a tendency to have very similar chemical properties due to periodic trends.

 

 

• Question 10

3 out of 3 points

 

An element has two different isotopes: one that weighs 65 amu and another that weighs 67 amu. If the average atomic mass of all the isotopes is 66.5 amu, what can be said about the relative abundance of the isotopes?

 

 

•

• Question 1

3 out of 3 points

 

Barium ions carry a 2+ charge, and nitrogen ions carry a 3- charge. What would be the chemical formula for the ionic compound barium nitride?

 

 

• Question 2

3 out of 3 points

 

Chlorine, Cl2, is a gas at room temperature, but bromine, Br2, is a liquid. Explain.

 

 

• Question 3

3 out of 3 points

 

If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the mass of the ocean is 1.5 × 1018 tons, how much gold is in the ocean?

 

 

• Question 4

3 out of 3 points

 

Distinguish between a metal and a metal-containing compound.

 

 

• Question 5

3 out of 3 points

 

How many oxide ions (O-2) are needed to balance the positive charge of a titanium ion (Ti+4)?

 

 

• Question 6

3 out of 3 points

 

Chemistry is the study of

 

 

• Question 7

3 out of 3 points

 

Is the following transformation representative of a physical change or a chemical change?

 

 

 

 

• Question 8

3 out of 3 points

 

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

 

 

 

 

• Question 9

3 out of 3 points

 

How many different elements are in the compound C6H12O6?

 

 

• Question 10

3 out of 3 points

 

Oxygen, O2, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

 

 

•

• Question 1

3 out of 3 points

 

As hot mantle rock rises, it expands. As it expands it cools. This cooler rock is

 

 

• Question 2

3 out of 3 points

 

According to the theory of seafloor spreading, molten rock is rising up along

 

 

• Question 3

3 out of 3 points

 

Compare the relative speeds of primary and secondary seismic waves, and relate speeds of travel to the medium in which the waves travel.

 

 

• Question 4

3 out of 3 points

 

Alfred Wegener supported his theory of continental drift by

 

 

• Question 5

3 out of 3 points

 

Convergent boundaries are regions of

 

 

• Question 6

3 out of 3 points

 

Batholiths are massive plutons formed from the intrusion of

 

 

• Question 7

3 out of 3 points

 

As rock is heated, the first minerals to melt are those

 

 

• Question 8

3 out of 3 points

 

A composite volcano is formed by

 

 

• Question 9

3 out of 3 points

 

As the process of crystallization continues (from molten liquid to solid crystal), how does the composition of the molten liquid change?

 

 

• Question 10

3 out of 3 points

 

Andesitic magma produces

 

 

•

• Question 1

3 out of 3 points

 

As ocean currents carry warm water from equatorial regions northward, lands bordering the ocean are warmed. A prime example of such warming is the

 

 

• Question 2

3 out of 3 points

 

Air near the equator averages higher temperatures than air near the poles because

 

 

• Question 3

3 out of 3 points

 

Air that flows southward from the horse latitudes in the Southern Hemisphere deflects eastward to produce the

 

 

• Question 4

3 out of 3 points

 

At lower elevations the air is generally

 

 

• Question 5

3 out of 3 points

 

Air that flows southward from the horse latitudes in the Northern Hemisphere produces the

 

 

• Question 6

3 out of 3 points

 

As air temperature decreases, relative humidity

 

 

• Question 7

3 out of 3 points

 

Behind a warm front, the air is

 

 

• Question 8

3 out of 3 points

 

Daily afternoon thunderstorms along the Gulf Coast are most likely caused by a

 

 

• Question 9

3 out of 3 points

 

As air temperature cools below its dew point temperature, the air's water vapor

 

 

• Question 10

3 out of 3 points

 

As rising air cools, its ability to accommodate water vapor decreases so the

 

 

•

• Question 1

3 out of 3 points

 

A radio signal emitted from Earth would take about

 

 

• Question 2

3 out of 3 points

 

All of the stars we see at night with our unaided eyes are within

 

 

• Question 3

3 out of 3 points

 

A main sequence star begins transforming into a red giant when

 

 

• Question 4

3 out of 3 points

 

Because a white dwarf is no longer burning fuel, it is more accurately described as being a

 

 

• Question 5

3 out of 3 points

 

A light year is a unit of

 

 

• Question 6

3 out of 3 points

 

Comets orbit about the

 

 

• Question 7

3 out of 3 points

 

A small rock in interplanetary space is called a

 

 

• Question 8

3 out of 3 points

 

Consider a huge rotating cloud of particles in space that gravitate together to form an increasingly dense ball. As the cloud shrinks in size, it

 

 

• Question 9

3 out of 3 points

 

Earth's Moon is about the

 

 

• Question 10

3 out of 3 points

 

During the peak of a total annular eclipse, the image of the Sun cast onto some white paper is