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Category CCategory A

10 Points

Lead is a bluish-white metal that will burn in air to produce lead (II) oxide. It is highly malleable and was used by the Romans to make pipes to carry water ("plumbing" is taken from the Latin name for lead "plum bum"). It has a relatively low melting point of 327°C and an atomic weight of 207.2 amu. Which property of lead is a chemical property?

high malleability

burns in air

low melting point

atomic weight is 207.2 amu

WRONG ANSWER

burns in air

20 Points

In order to determine the velocity of an object, what measurements must be made?

time and distance

time, distance, and mass

time, distance, and direction

time, distance, and volume

TRY AGAIN

time, distance, and direction

30 Points

An analogy can be drawn between the work done by an electric current flowing through an electrical appliance and the work done by water flowing over a waterfall. In such an analogy, identify the property of the electric current that is analogous to the rate of flow of water over the fall.

power voltage

amperage resistance

The answer you thought was right is WRONG

amperage

40 Points

Identify the types of fields that interact to produce motion in an electric generator.

an electrical field and a gravitational field

a magnetic field and an electrical field

two electrical fields

two magnetic fields

Try again later

a magnetic field and an electrical field

50 PointsIdentify the type's of current that can be

used to power electric motors.

direct current only

absolute current only

direct current or alternating current only

alternating current, direct current or absolute current

Wrong again

direct current or alternating current only

10 PointsComplete the following reaction. NaOH(aq)

+HCl(aq)=_____+H2O(l)

2NaCl(1)

NaCl(s)

NaCl(aq)

2NaCl(aq)

BOO !

NaCl(aq)

20 Points

Which of the following will have the lowest pH?

rainwater

distilled water

soapy water

bleach

Sorry, Wrong Answer

rainwater

30 PointsDr. M wants to perform research on the effects of exposure to gamma radiation. Dr. B has developed a new type of instrument that fires gamma radiation at tumors; he wants to research the effectiveness of his "gamma knife." What is the fundamental

difference between the research performed by these two doctors?

Dr. M must know about nuclear decay, and Mr. B doesn't need to.

Dr. M's research is ethical and Dr. B's is not.

Dr. M is conducting a scientific investigation and Dr. B is not.

Dr. B is focusing on technological design and Dr. M is not.

GO BACK, and try again

Dr. B is focusing on technological design and

Dr. M is not.

40 PointsAlan constructs a circuit that has two 1.5 V batteries arranged in series. These batteries

power a single light bulb. What will happen if Alan adds another load in series?

The resistance of the circuit has increased, so more current will flow.

The voltage of the circuit has increased, so more current will flow.

The resistance of the circuit has decreased, so less current will flow.

The resistance of the circuit has increased, so less current will flow.

SORRY

The resistance of the circuit has increased, so less

current will flow.

50 PointsWhich of the following substances is the most

chemically stable?

Mg2+

Mg+

Cl-

MgCl2(s)

Wrong Answer

MgCl2(s)

10 PointsWhat is the danger of an uncontrolled chain

reaction within the core of a nuclear fission reactor?

An uncontrolled chain reaction will use up all of the fuel in the reactor and force the fission of the metals that make up the core casing.

An uncontrolled chain reaction will produce enough heat to crack the reactor core open, releasing radioactive material.

An uncontrolled chain reaction will produce enough electrons to electrically charge the reactor core.

An uncontrolled chain reaction will produce enough heat to induce fusion in the reactor core, which will result in an explosion.

Sorry, you have the wrong answer

An uncontrolled chain reaction will produce enough heat to crack the reactor core open,

releasing radioactive material.

20 PointsThe loss or gain of which subatomic

particle has the greatest effect on chemical reactivity?

electron

proton

Neutron

nucleon

Try again later

electron

30 PointsWhat question did the students pose before

designing this experiment?

How does temperature affect the rate of the breakdown of hydrogen peroxide into water and oxygen?

How much dye do I need to use to determine the presence of hydrogen peroxide while performing this experiment?

How many plants should I put in the laboratory to have an abundance of oxygen in the air?

How does time affect the increase in temperature when hydrogen breaks down into oxygen and water?

SORRY, wrong answer

How does temperature affect the rate of the breakdown of hydrogen peroxide

into water and oxygen?

40 PointsFor new scientific knowledge to be gained, scientists must

share their ideas. What is an appropriate way for scientists to communicate their findings?

Make flyers advertising their results.

Write a book immediately after the experiment is conducted, pronouncing the discovery as fast.

Hold a press conference to share the information gained.

Submit complete information regarding the experiment to a peer-reviewed scientific journal.

Wrong, wrong and WRONG !

Submit complete information regarding the experiment to a peer-

reviewed scientific journal.

50 PointsWhen energy is transformed from one form to

another, some of the energy is lost in the form of

mechanical energy.

hydrogen gas.

water.

thermal energy.

Nope, not the right answer

thermal energy.

10 Points

Joey hit a wall with a 1 meter long sledgehammer 20 times with a force of 200 Newton's. Much to

Joey's dismay, the wall remained undamaged. If work = force X distance, how much work did

Joey do on the wall?

0 joules

10 joules

200 joules

4000 joules

You should try studying

0 joules

20 PointsA recently-used hot ceramic teapot is placed on a

cold trivet. Which statement is correct about the sequence of thermal energy transfers?

The air transfers energy to the teapot and trivet, and they become cool.

The teapot transfers all of its energy to the air and becomes cool.

The teapot transfers some energy to the trivet and some energy to the air and becomes cool.

The trivet transfers energy to the teapot and the teapot becomes cool.

WRONG AGAIN

The teapot transfers some energy to the trivet and some energy to the air and becomes

cool.

30 PointsSmart glass technologies have become increasingly popular. British scientists

recently developed a window glass that helps buildings stay cool. At regular temperatures, the glass allows in both infrared (IR) and ultraviolet (UV) light. But above 29°C, the coating on the glass undergoes a chemical change, causing

it to block IR light. What happens to the IR light?

It is absorbed by the glass.

It is refracted by the glass.

It is relected by the coating on the glass.

It is refracted by the coating on the glass.

Try again later

It is relected by the coating on the

glass.

40 PointsWhich of the following produces energy from

processes that do not involve a chemical change?

a bonfire

a fossil fuel power plant

a nuclear power plant

a car

BOOO

a nuclear power plant

50 Points

What characteristic do all waves share?

All waves move matter.

All waves transfer energy.

All waves can move through a vacuum.

All waves travel at 3.0X108 m/s.

Wrong again

All waves transfer energy.

10 PointsWhat happens when two negatively-

charged particles are brought together?

They undergo combustion.

They are repelled from each other.

They are attracted to each other.

They form an isotope.

Your wrong again

They are repelled from each other.

20 PointsWhat is the resistance of a hair dryer that uses 4 A

of current when the voltage is 120 V?

480 ohms

40 ohms

30 ohms

0.33 ohms

Try again

30 ohms

30 PointsWhat was the main problem with J.J. Thomson's

model of the atom?

It did not account for protons, and so the Thomson model was negatively charged.

It did not account for electrons, and so the Thomson model was positively charged.

It hypothesized many more electrons than protons.

It did not account for a centralized nucleus contains most of the atom's mass.

Try again

It did not account for a centralized nucleus contains most of the

atom's mass.

40 PointsThe speed of an object increases 10 m/s over 10

seconds. What is its acceleration?

0 m/s^2

1 m/s^2

10 m/s^2

100 m/s^2

1 m/s^2

50 PointsWhich of the following is a source of potential

energy that could release radiant energy?

a diamond

a sunflower seed

a neutron

a match

Go back and study then try again later

a match