Quiz Standard 1 Answer Key

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Explanation:
Based on the density calculation, the cube must be made of silver. To determine the density, divide the mass by the volume. The volume = l x w x h. Since this is a cube, the volume = (1.5cm)³ = 3.375 cm³. D =

35.45g

3.375cm³

= 10.50

, so this must be silver according to the chart.

28)

How should you change this image to represent an ionic bond between sodium and fluorine?

A)	Move 7 electrons from fluorine to sodium.

B)	Move one electron from fluorine to sodium.

C)	Move one electron from sodium to fluorine.

D)	Nothing. The image already represents an ionic bond.

E)	None of the above

Explanation:_The_correct_answer_is_Move_one_electron_from_sodium_to_fluorine'>Explanation:
The correct answer is Move one electron from sodium to fluorine. Non metals take electrons from metals to form ionic bonds.

29) What is the chemical formula for potassium oxide?

K₂O

KO₂

PO₂

E)	None of the above

Explanation:_The_correct_formula_for_aluminum_fluoride_is_AlF_3_.'>Explanation:
The correct formula for potassium oxide is K₂O. First, be sure you have the correct symbols for each element. Then check the oxidation/valence number: potassium (K) is +1 and oxygen (O) is -2. Using the criss-cross method to be sure that the sum of the oxidation numbers equals zero, we have K₂O.

30) What is the chemical formula for aluminum fluoride?

Al₃F

AlF

AlF₃

AlFl₃

E)	None of the above

Explanation:_The_elements_involved_at_2_nonmetals_that_will_form_covalent_bonds._NH_3'>Explanation:
The correct formula for aluminum fluoride is AlF₃. First, be sure you have the correct symbols for each element. The symbol for fluorine is F. Then check the oxidation/valence number: aluminum (Al) is +3 and fluorine (F) is -1. Using the criss-cross method to be sure that the sum of the oxidation numbers equals zero, we have AlF₃.

31) What is the chemical formula for the ionic compound calcium chloride?

Ca₂Cl

CaCl₂

Cl₂Ca

ClCa₂

E)	None of the above

Explanation:_FeO'>Explanation:
CaCl₂ Calcium has a positive 2 charge and chlorine has a negative 1 charge. It takes 2 chlorine atoms for every calcium in order to be neutral.

32) The IUPAC name for the common household cleaner, ammonia, is nitrogen trihydride. Identify the formula of ammonia.

NH₃

N₃H

N₃H₃

E)	None of the above

Explanation:
The elements involved at 2 nonmetals that will form covalent bonds. NH₃

33)

Ca₃(PO₄)₂ + H₂SO₄ → CaSO₄ + H₃PO₄

Balance this reaction if necessary.

balanced

B)	1, 3, 3, 2

C)	1, 2, 3, 3

D)	3, 2, 1, 3

E)	None of the above

Explanation:_Disposal_of_byproducts'>Explanation:
1, 3, 3, 2
Ca₃(PO₄)₂ + 3H₂SO₄ → 3CaSO₄ + 2H₃PO₄

34)

H₂SO₄ + NaOH → Na₂SO₄ + H₂O

Balance this reaction if necessary.

balanced

B)	1, 2, 1, 2

C)	1, 2, 1, 4

D)	1, 2, 2, 2

E)	None of the above

Explanation:
1, 2, 1, 2
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

35) What is the chemical formula for iron(II) oxide?

Fe₂O₂

FeO

Fe₂O₃

FeO₂

E)	None of the above

Explanation:
FeO An iron(II) ion possesses a +2 charge (stated by the Roman numeral) and oxide ions have a -2 charge. It takes one iron ion to electrically balance an oxide ion.

Quiz Standard 3 Answer Key

Teacher Name:

Quiz Generated On: 04-28-2016

1) Positively charged particles consisting of two protons and two neutrons emitted by radioactive materials are

A)	beta particles.

B)	gamma particles.

C)	alpha particles.

D)	positron particles

E)	None of the above

Explanation:
Alpha particles consist of the same number of protons (2) and neutrons (2) as a helium nucleus, but they are emitted from an atom during radioactive decay.

2)

http://www.usatestprep.com/modules/gallery/files/1/187/187.gif

While working near a radioactive mine, workers usually wear heavy plastic suits. These suits protect them from all but

A)	beta radiation.

B)	gamma radiation.

C)	alpha radiation.

D)	ultraviolet radiation.

E)	None of the above

Explanation:
Alpha particles can be stopped by air. UV radiation can be stopped by a normal layer of clothing. Beta particles can be stopped by the thick plastic suit. Only gamma radiation can penetrate the heavy suit. It can only be stopped by thick walls of lead or concrete.

3) ________________ is a source of energy that utilizes uranium-235 in a fission reaction to vaporize water. The steam is then used to turn turbines to generate electricity.

Coal

Gasoline

C)	Nuclear power

D)	Hydroelectricity

E)	None of the above

Explanation:
Nuclear power uses a fission reaction to heat water to steam.

4) One of the negative aspects of using nuclear power as an alternative energy source is

A)	it pollutes the air.

B)	finding a fuel source.

C)	the disposal of byproducts.

D)	it does not produce much energy.

E)	None of the above

Explanation:
Disposal of byproducts is a negative aspect of nuclear power because the waste products can remain radioactive for thousands of years.

5) Americium-241 is a radioactive substance used in smoke detectors. The half life of americium is 432 years. If a smoke detector initially contains 1 gram of Americium 241, how much will remain in 432 years?

0.5g

1.0g

1.5g

2.0g

E)	None of the above

Explanation:
Since the half-life is 432 years, in 432 years half of it will have transmutated into a different substance. Therefore, half of it will be left, or 0.5g.

6)

Radioactive Decay of Carbon 14

Years since death	C¹⁴ atoms remaining per 1.0 x 10⁸ C¹² atoms
0	10,000
5,700	5,000
11,400	2,500
17,100	1,250
22,800	625
28,500	312
34,200	156
39,900	78
45,600	30
51,300	20
57,000	10
62,700	5
68,400	2

Use the chart to determine the half-life of Carbon-14.

A)	5,000 years

B)	5,700 years

C)	10,000 years

D)	11,400 years

E)	None of the above

Explanation:
The answer is 5,700 years because the amount reduces by half from 10,000 to 5,000 particles over a period of 5,700 years. The amount of time to reduce by half is called the half-life.

7) Which is an example of nuclear energy being converted into heat and light energy?

the sun

a volcano

C)	a rocket engine

D)	a coal burning power plant

E)	None of the above

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