Question 1 (2 points) A beta particle is _____ . Question 1 options: neutral rad

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Question 1 (2 points)

A beta particle is _____ .

Question 1 options:

neutral radiation

a fast moving electron

an x-ray

a helium ion

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Question 2 (1 point)

Which of the following can be considered a definition of theory?

Question 2 options:

A theory can be an explanation of scientific laws.

A theory is an integrated explanation of numerous hypotheses, each supported by a large body of observations and experiments.

A theory is a condensation and simplification of many data that previously appeared unrelated.

A theory is a prediction for new data suggesting new relationships among a range of natural phenomena.

All of the above.

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Question 3 (1 point)

An integrated explanation of numerous hypotheses is known as a _____.

Question 3 options:

fact

guess

theory

law

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Question 4 (2 points)

If a radioactive substance has a half life of 5.0 minutes, which of the following statements is correct?

Question 4 options:

At the end of 5.0 minutes, the amount of radioactive material will have tripled.

It will take at least 5.0 minutes for the reaction to begin.

At the end of 5.0 minutes, the amount of radioactive material will have doubled.

At the end of 10.0 minutes, the amount of radioactive material will be 1/4th as much as originally present.

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Question 5 (2 points)

The law of conservation of energy states that in the absence of external work input or output, _____.

Question 5 options:

energy cannot be created or destroyed

mass cannot be created or destroyed

energy can be created and then destroyed

momentum cannot be created or destroyed

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Question 6 (2 points)

That family of elements that is highly nonreactive is called the _____.

Question 6 options:

alkali metal family

alkaline earth family

rare gas family

transition metals

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Question 7 (2 points)

The role of a catalyst is to _____.

Question 7 options:

serve as a product in a chemical reaction

slow down a chemical reaction

speed up a chemical reaction

act as a reactant in a chemical reaction

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Question 8 (2 points)

Ocean water has a pH around 8.2. Identify the correct statement.

Question 8 options:

Ocean water is neither acidic nor basic.

Ocean water has a neutral pH.

Ocean water is slightly basic.

Ocean water is slightly acidic.

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Question 9 (2 points)

Elements in the same period on the Periodic Table will have the _____.

Question 9 options:

same number of protons in their outermost energy levels

increasing number of protons as they move across the period

same number of electrons in their outermost energy levels

decreasing number of protons as they move across the period

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Question 10 (2 points)

Which of the following represents a chemical change?

Question 10 options:

the burning of gasoline

dry ice, solid carbon dioxide, undergoing sublimation

ice melting

metal expanding when heated

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Question 11 (2 points)

Groups on the periodic table list elements with _____.

Question 11 options:

similar number of neutrons

similar chemical properties

different chemical properties

similar number of electrons

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Question 12 (2 points)

Spectral lines are useful in _____.

Question 12 options:

identifying atoms or molecules

understanding how electrons are arranged in atoms

both of the above

none of the above

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Question 13 (2 points)

Which of the following does not influence the rate of a reaction?

Question 13 options:

concentration of reactants

temperature

surface area

molar mass

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Question 14 (2 points)

Which of the following is not a physical change?

Question 14 options:

metal expanding when heated

dry ice, solid carbon dioxide, undergoing sublimation

the vaporization of gasoline

ice melting

none of the above

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Question 15 (2 points)

Which part of the visible region of the electromagnetic spectrum has the lowest energy?

Question 15 options:

ultraviolet

yellow

blue

red

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Question 16 (2 points)

Which of the following lists the fundamental forces in decreasing strength (from greatest to least)?

Question 16 options:

gravity, electromagnetic, strong nuclear, weak nuclear

strong nuclear, electromagnetic, weak nuclear, gravity

electromagnetic, strong nuclear, weak nuclear, gravity

strong nuclear, electromagnetic, gravity, weak nuclear

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Question 17 (2 points)

During an _____ reaction, _____.

Question 17 options:

exothermic, energy is released

endothermic, energy is absorbed

both are correct

both are incorrect

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Question 18 (2 points)

Temperature is generally proportional to a substance's _____.

Question 18 options:

average translational kinetic energy

chemical energy

vibrational potential energy

rotational kinetic energy

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Question 19 (2 points)

Which of the following amounts is closest to the molar mass of C8H10N4O2?

Question 19 options:

200 g

1.30 lbs

128.44 g

1.9419 kg

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Question 20 (2 points)

A box is moved from the floor to the top of a table.

Question 20 options:

work is done by the box

potential energy of the box increases

kinetic energy of the box is constant throughout the process

none of the above

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Question 21 (2 points)

Light waves and sound waves both consist of vibrations. However, _____.

Question 21 options:

light waves require a medium for transmission

light waves require no medium for transmission

sound waves require no medium for transmission

sound and light waves both require a medium for transmission

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Question 22 (2 points)

Identify the correct statement below dealing with Newton's Second Law.

Question 22 options:

mass and acceleration are inversely proportional

force and mass are inversely proportional

force and acceleration are inversely proportional

mass and acceleration are directly proportional

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Question 23 (2 points)

If an atom has 19 electrons, 20 neutrons and 19 protons, what is its approximate atomic mass?

Question 23 options:

39

20

19

38

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Question 24 (2 points)

Velocity and acceleration differ from one another in that _____.

Question 24 options:

acceleration is a vector quantity while velocity is not a vector quantity

acceleration is the change in velocity per unit time

velocity is the change in acceleration per unit time

velocity is a vector quantity while acceleration is not a vector quantity

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Question 25 (2 points)

Graphite and diamond are both forms of the element carbon. Identify the correct statement.

Question 25 options:

Graphite and diamond will be composed of different types of carbon atoms in the molecule.

Graphite and diamond will both be composed of carbon atoms but they will be arranged differently in the molecule.

Graphite will be composed of carbon protons, while diamond will be composed of carbon neutrons.

Graphite will be composed of carbon monoxide and carbon atoms, while diamond will be composed only of carbon atoms.

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Question 26 (2 points)

An ion will differ from an atom of the same element in that the ion will have _____.

Question 26 options:

a different number of electrons from the atom

a different number of neutrons from the atom

a different number of protons from the atom

the same number of electrons and protons as the atom

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Question 27 (2 points)

In the nucleus of the atom, we have _____.

Question 27 options:

neutrons only

protons and neutrons

neutrons and electrons

protons and electrons

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Question 28 (2 points)

A transformer _____.

Question 28 options:

relies on magnetic force to operate

typically violates Ohm's law

makes transferring low loss, high voltage, current useful

allows direct current voltages to raised or lowered

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Question 29 (2 points)

In a hydroelectric power plant, you have the conversion of _____.

Question 29 options:

potential energy to kinetic energy

chemical energy to heat energy

radiation to heat energy

fossil fuel heat energy to nuclear energy

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Question 30 (2 points)

Assuming no frictional force, which of the following statements is correct?

Question 30 options:

A feather will fall to the ground more slowly than a heavy lead ball assuming both are at the same height when they begin their fall.

A feather and a heavy lead ball will fall to the ground at different rates.

A lead ball will fall to the ground more rapidly than a feather assuming both are at the same height when they begin their fall.

A feather and a heavy lead ball will fall to the ground at the same rate.

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Question 31 (2 points)

Cups made of different materials are sitting on the kitchen counter. Each is filled with hot coffee having the same temperature. Which type of cup will cool the quickest?

Question 31 options:

glass

ceramic

metal

styrofoam

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Question 32 (2 points)

____ acts as an acid in the following reaction: NH3 + PH3 NH2- + PH4+

Question 32 options:

Both NH3 and PH3

NH3

PH3

NH2-

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Question 33 (2 points)

What is the correct sequence of steps in the scientific method?

I. State a problem
II. Analyze and interpret data
III. Develop a hypothesis
IV. Share the results with other scientists
V. Design and perform experiment to test the hypothesis

Question 33 options:

V - II - I - III - IV

III - I - V - II - IV

I - II - III - IV - V

V - IV - III - II - I

I - III - V - II - IV

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Question 34 (2 points)

A floating object will displace _____.

Question 34 options:

a volume of fluid equal to its own weight

a weight of fluid equal to its volume

a volume of fluid equal to its own volume

a weight of fluid equal to its own weight

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Question 35 (2 points)

In the scientific method, a hypothesis is _____.

Question 35 options:

is a statement of fact

makes a prediction that can be tested

is usually proven to be correct

can only be tested once

all of these

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Question 36 (2 points)

The following (fake) chemical equation is not balanced: AD2 + R3 A2R2 + D. After balancing, this chemical equation is _____.

Question 36 options:

6 AD2 + 2 R3 3 A2R2 + 6 D2

3 AD2 + 2 R3 3 A2R2 + 4 D

6 AD2 + 2 R3 3 A2R2 + 12 D

A6D12 + R6 A6R6 + 12 D

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Question 37 (3 points)

Two bowling balls, each with a positive charge of 2.5 x 10^-5 C, are located 24.0 cm apart. The size of the electric force between them is _____ N.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 37 options:

Answer

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Question 38 (3 points)

A rock of mass 3.00 kg is dropped from a stationary hot air ballon. Its potential energy at the top is 18,000 J. When its potential energy is 10,000 J, the rock is falling at _____ m/s.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 38 options:

Answer

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Question 39 (3 points)

The specific heat of a particular metal alloy is 0.22 calories per gram per degree Celsius. Calculate the amount of heat required (in calories) to raise the temperature of 3.0 kg of this material by 14 degrees.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 39 options:

Answer

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Question 40 (3 points)

A water wave oscillates up and down once every 2.50 seconds. The distance between wave crests is 2.00 m. The speed of this wave is _____ m/s.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 40 options:

Answer

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Question 41 (3 points)

An isotope of the element Thallium, Tl-206, undergoes beta decay with a half-life of 3.1 minutes. Assume you begin with 16.00 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 41 options:

Answer

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Question 42 (3 points)

Assume that a 22.0 volt energy source is in a circuit that has a resistance of 7.00 ohms. Determine the power consumption in watts.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 42 options:

Answer

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Question 43 (3 points)

A solution has a hydroxide-ion concentration of 1.0 x 10^-4 mol per liter. What is the pH of this solution?

Only enter your numerical answer below - Report your answer to 2 decimal places.

Your Answer:

Question 43 options:

Answer

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Question 44 (3 points)

The number of people this planet can support is largely determined by the amount of ammonia-based fertilizer that can be produced. Without the ability to chemically manufacture ammonia, the world's population would be closer to 1/6 of its current size. Since the early twentieth century ammonia has been produced via the process shown below.

3 H2 + N2 2 NH3

How many grams of ammonia are produced when 30.00 g of H2 react?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 44 options:

Answer

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Question 45 (3 points)

A 2200 kg car is moving at a speed of 25.0 m/s. Determine the stopping distance (in meters) if the brakes supply a force of 3500 newtons.

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 45 options:

Answer

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Question 46 (3 points)

A 59 newton horizontal force pushes a 5.0 kg mass sitting on a horizontal surface. Additionally, the horizontal surface exerts a 30 newton frictional force on the mass. What is the acceleration of the mass?

Only enter your numerical answer below - do not include units. Report your answer to 2 decimal places.

Your Answer:

Question 46 options:

Answer

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Save All Responses Go to Submit Quiz

Explanation / Answer

1) B

2) E

3) D

4)D

5) A

6) C

7)C

8) C

9) B

10) A

11) B

12) C

13) D

14)A

15) D

16) C

17) A

18) A

19) A

20) B

Hi, send the remaining questions in a new post and we will glad to answer

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