chem test 5

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The number of electrons in an ion with 20 protons and an ionic charge of 2+ is

18

How many lone pairs of electrons are in the electron-dot structure of H2O?

2

Elements in group 2A(2) of the periodic table form ions with a charge of

2+

How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?

3

What is the ionic charge of an ion with 13 protons and 10 electrons?

3+

How many valence electrons are in the electron-dot structure of CCl4?

32

The number of electrons in the highest energy level of carbon is

4

The number of electrons in the highest energy level of nitrogen is

5

How many valence electrons are in the electron-dot structure of H2O?

8

What is the formula for aluminum nitrite?

Al(NO2)3

The correct formula for a compound formed from the elements Al and O is

Al2O3 .

The ion of aluminum is

Al3+

What is the formula of carbon tetraiodide?

CI4

Which of the following compounds contains an ionic bond?

CaO

The name of the Cu+ ion is

Copper (I)

Which one of the following elements forms two or more ions with different ionic charges?

Fe

What is the correct formula for the iron 2 ion?

Fe2+

What is the correct formula for iron 3 sulfide?

Fe2S3

Which one of the following compounds contains an ion with a 3+ charge?

FeCl3

A polar covalent bond is found in which of these compounds?

H2O

Which of the following compounds contains a polar covalent bond?

Hcl

The name of the HSO4- ion is

Hydrogen Sulfate

What is the symbol for the ion with 19 protons and 18 electrons?

K+

Ionic bonding is expected in which of these compounds?

KF

Which of the following elements has the lowest electronegativity?

Li

The correct formula for the compound formed from Mg and S is

MgS

Which of the following substances contains a nonpolar covalent bond?

N2

What is the formula of the nitride ion?

N3-

The formula for a molecule formed from N and Cl would be

NCl3

What is the formula of a compound that contains Na+ and PO43- ions?

Na3PO4

What is the correct formula for the oxide ion?

O2-

The carbon tetrachloride molecule, CCl4, is

a nonpolar molecule with polar bonds.

The ammonia molecule ( NH3 ) is

a polar molecule with polar bonds

The name of Al2(SO4)3 is

aluminum sulfate

Which of the following polyatomic ions has a positive charge?

ammonium

In a molecule with covalent bonding

atoms are held together by sharing electrons

The octet rule indicates that

atoms lose, gain, or share valence electrons to have 8 valence electrons

The shape of the water molecule (H2O) is

bent

Which of the following elements does NOT exist as a diatomic molecule?

carbon

The types of compounds that use prefixes in their names are

covalent compounds

The correct name for the compound N2O3 is

dinitrogen trioxide

The strongest interactions between molecules of hydrogen chloride are

diople-dipole interactions

The main interactions between molecules of iodine 12 are examples of

dispersion forces

The strongest interactions between molecules of hydrogen (H2) are

dispersion forces

The ability of an atom to attract the shared electrons in a covalent bond is its

electronegativity

How many electrons will chlorine gain or lose when it forms an ion?

gain 1

An anion always

has a negative charge

An ionic compound

has a net charge of zero

The strongest interactions between molecules of ammonia (NH3) are

hydrogren bonds

Valence electrons are electrons located

in the outermost energy level of an atom

If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is

ionic

Fe2(SO4)3 is called

iron (III) sulfate

The number of valence electrons found in an atom of a Group A element is equal to

its group number

The shape of the carbon dioxide (CO2) is

linear

How many electrons will aluminum gain or lose when it forms an ion?

lose 3

To form an ion, a sodium atom

loses one electron

The compound MgCl2 is named

magnesium chloride

In ionic compounds, lose their valence electrons to form positively charged

metals; cations

A(n) is the smallest neutral unit of two or more atoms held together by a covalent bond.

molecule

In a covalently bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons

needed to give it a stable electron configuration

The correct name of the compound NCl3 is

nitrogen trichloride

The bond in Cl2 is a(n)

nonpolar covalent bond

Which of the following polyatomic ions has a 3- ionic charge?

phosphate

The water molecule has a dipole with the negative portion

pointing toward the oxygen atom.

A group of covalently bonded atoms that has an overall electrical charge is called a(n)

polyatomic ion

The shape of the ammonia molecule (NH3) is

pyramidal

The VSEPR theory allows us to determine the most favorable

shape of a molecule

Double and triple bonds form because

single covalent bonds do not give all of the atoms in the molecule eight valence electrons.

The shape of the carbon tetrachloride molecule is

tetrahedral

The carbon tetrachloride molecule, CCl4, has the shape of a

tetrahedron

In an electron-dot structure of an element, the dots are used to represent

the valence electrons

Hydrogen sulfide, H2S, has a shape similar to

water


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