Quiz Standard 1 Answer Key

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Quiz Standard 1 Answer Key

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Quiz Generated On: 04-28-2016

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Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 amu.

E)	None of the above

Explanation:_One_atom_of_sulfur_with_an_isotopic_mass_number_of_34_has_18'>Explanation:
One atom of sulfur with an isotopic mass number of 34 has 18 neutrons. 34 (total) - 16 (protons) = 18 (neutrons).

2) Which is true of ionic compounds?

A)	They are good conductors as solids.

B)	They are made by sharing electrons.

C)	They are made of metals and nonmetals.

D)	They are electrically neutral when dissolved in a solution.

E)	None of the above

Explanation:_All_covalent_compounds_share_electrons_in_bonds'>Explanation:
They are made of metals and nonmetals is true of ionic compounds. They usually form between elements on opposite sides of the periodic table. Ionic compounds are only good conductors when molten or dissolved. When dissolved, they form ions, charged particles. Ionic compounds transfer electrons.

3) Which is true of all covalent compounds?

A)	They share electrons in bonds.

B)	They are electrically charged.

C)	They are good conductors in water.

D)	They are usually made of a metal and a nonmetal.

E)	None of the above

Explanation:_The_electrical_charge_on_an_atom_as_a_whole_is_neutral'>Explanation:
All covalent compounds share electrons in bonds. They are made of two or more nonmetals which share electrons. They do not form ions, charged particles, so they are not good conductors in water.

4) A positively charged ion will bond with

A)	a negatively charged ion.

B)	a neutral atom.

C)	another positively charged ion.

D)	nothing else.

E)	None of the above

Explanation:_Ionic_bonds'>Explanation:
A positively charged ion will bond with a negatively charged ion. Have you ever heard the phrase "opposites attract"?

5) The electrical charge on an atom as a whole is

negative.

neutral.

positive.

D)	dependent upon the atomic number.

E)	None of the above

Explanation:_Sodium_has_11'>Explanation:
The electrical charge on an atom as a whole is neutral. The number of positive protons and negative electrons is equal.

6) The atomic number of magnesium is 12. Its nucleus must contain

A)	6 protons and 6 neutrons.

B)	6 neutrons and 6 electrons.

C)	12 neutrons and no protons.

D)	12 protons and no electrons.

E)	None of the above

Explanation:_The_correct_number_of_protons_is_6'>Explanation:
The atomic number of magnesium is 12. Its nucleus must contain 12 protons and no electrons. The atomic number of an atom is determined by the number of protons. Electrons are not in the nucleus.

7) When K⁺ and I^- combine, a(n) _________ bond results.

covalent

ionic

metallic

D)	polyatomic

E)	None of the above

Explanation:_The_correct_answer_is_atom.'>Explanation:
When 2 ions such as K+ and I^- combine an ionic bond results.

8) In ____________, electrons are gained by atoms and lost by others.

A)	ionic bonds

B)	covalent bonds

C)	metallic bonds

D)	polyatomic bonds

E)	None of the above

Explanation:
Ionic bonds occur between metals and nonmetals. Metals have fewer valence electrons than nonmetals and will give their valence electrons to a nonmetal in order to become more stable.

9) ___________ are bonds in which valence electrons are shared.

A)	Ionic bonds

B)	Atomic bonds

C)	Covalent bonds

D)	Hydrogen bonds

E)	None of the above

Explanation:
When nonmetals combine in covalent bonds they share valence electrons.

10)

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What is the number of protons in an atom of sodium?

11.9897

E)	None of the above

Explanation:
Sodium has 11 protons. The atomic number is the same as the number of protons for each element. From the periodic table, the atomic number is the whole number that is used to put the elements in order. For sodium, it is 11.

11) Electrons are transferred in the formation of ______________ bonds.

ionic

covalent

metallic

D)	all chemical

E)	None of the above

Explanation:
In ionic bonds, electrons are transferred to satisfy their outer energy level. Electrons are shared in covalent bonds.

12) A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

E)	None of the above

Explanation:
The correct number of protons is 6. All isotopes of any element have the same number of protons.

13) Which statement is the BEST definition of an atom?

A)	Anything that has mass and occupies space.

B)	The smallest particle that has the properties of an element.

C)	A substance that cannot be broken down chemically into simpler substances.

D)	The smallest unit of a substance that exhibits all of the properties characteristic of that substance.

E)	None of the above

Explanation:
The smallest particle that has the properties of an element, is the correct definition of an atom. A is the definition of matter; C is the definition of an element; and D is the definition of a molecule.

14)

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This image is an example of a(n)

atom.

compound.

mixture.

molecule.

E)	None of the above

Explanation:
The correct answer is atom. It is the smallest unit of an element, all of the others require more than one element.

15)

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Order these elements from LEAST to GREATEST atomic mass.

A)	Li, He N, S

B)	He, Li, N, S

C)	N, He, Li, S

D)	S, N, Li, He

E)	None of the above

Explanation:
He, Li, N, S orders these atoms from LEAST to GREATEST atomic mass. Atomic mass is the average atomic mass of the most abundant isotopes of an element. Simply add the number of protons and neutrons.

16) Describe the composition of the nucleus of an atom.

A)	It is composed of protons.

B)	It is composed of protons and neutrons.

C)	It is composed of protons and electrons.

D)	It is composed of protons, neutrons, and electrons.

E)	None of the above

Explanation:
An atomic nucleus is composed of protons and neutrons. The electrons are located in the outer electron cloud.

17)

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The compound formed has a(n) ___________ bond and is a(n) _________________.

A)	ionic; crystalline solid

B)	covalent; amorphous solid

C)	metallic; crystalline solid

D)	covalent; crystalline solid

E)	None of the above

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