CHEM 120 UNIT 2

The correct charge on the barium ion (#56) is

+2

How many nonbonding pairs are present in ammonia, NH3?

1

How many covalent bonds does the element O (#8) usually form?

2

How many dots are in the dot diagram for Oxygen (#8)?

6

The correct formula for a compound between Al and P is:

AlP

The correct formula for a compound between Ba and O is:

BaO

Which of the following elements would have properties similar to F (#9)?

Br (#35)

Sulfate is a polyatomic ion, SO4-2. What is the formula for calcium sulfate? (Calcium is #20)

CaSO4

TRANSITION metals named one way(using roman numerals)

Cr2+ = chromium (II) ion Cr3+= chromium (III) ion

Which of the following elements would be classified as a nonmetal?

F (#9)

The correct formula for iron (III) sulfide is

Fe2S3

Which of the following elements would be classified as an alkali metal?

K (#19)

What is the correct formula for potassium phosphide?

K3P

The correct formula for a compound between Mg and O is:

MgO

The element in group I and period 3 is:

Na (#11)

The correct formula for a compound between Na and N is:

Na3N

Which of the following is most likely to happen to an oxygen atom, O (#8), in order for it to acquire an octet of valence electrons?

O will gain two electrons to form O-2

Which of the following elements will form a cation?

Potassium (#19)

The correct name of Al-3 is (Al is #13)

aluminum ion

State the octet rule.

atoms will gain, lose, or share electrons in order to achieve 8

Which of the following elements would be classified as a representative element?

both K (#19) and Ar (#18) are representative elements

element

cannot be broken down Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions. Elements can only be changed into other elements using nuclear methods.

polyatomic ions

charged particles containing 2 or more covalently bonded atoms

An unknown substance Z can be broken down to substances X and Y by running an electric current through it. Substance Z is

compound

The correct name of Cu+2 is (Cu is #29)

copper (II) ion

In a nonpolar covalent bond,

covalent electrons are shared equally between two nonmetal atoms

heterogeneous mixture

different composition throughout ex: chunky peanut butter, chicken noodle soup

The octet rule states that

elements with 8 valence electrons are stable

Any halogen would be most likely to

gain one electron to form a -1 ion

Describe the organization of the periodic table.

groups are vertical, periods are horizontal, measured by metals, transition metals, nonmetals, and metalloids

Chlorine (#17) is a(n)

halogen

Fluorine is a nonmetal with a very high electronegativity. Sodium is a metal with very low electronegativity. A bond between sodium and fluorine would be classified as:

ionic

When a metal loses electrons and bonds to a nonmetal which gains electrons, the resulting compound is considered:

ionic

naming ionic compounds

listing cation name first followed by anion name BaS= barium sulfide AlF3= aluminum flouride K2S= potassium sulfide

To fulfill the octet rule, an atom of magnesium (#12) will

lose two electrons

The correct name for MgO is

magnesium oxide

ionic compound

metal to nonmetal

A substance is made of small brown particles and small white particles. When poured into water, the substance separates - the brown particles sink and the white particles float. The original substance would be considered a(n)

mixture

anions are

negative ions, they are named by replacing the ending of the element with -ide followed by the word ion Br-1=bromide ion O2-=oxide ion S2- = sulfide ion

The correct name of N-3 is (N is #7)

nitride ion

How many covalent bonds does the element Ar (#18) usually form?

none

Which of the following elements has the symbol P?

phosphorus

Which of the following is an example of a homogeneous mixture?

salt water

homogeneous mixture

same composition throughout ex: creamy peanut butter

covalent bonds

sharing of electrons to give each atom an octet, nonmetal to nonmetal, DO NOT SIMPLIFY

Mendeleev arranged his elements in the periodic table by

similar chemistry in the same column

atom

smallest component of an element

How are electrons transferred between sodium and fluorine atoms to form sodium fluoride?

sodium loses one electron and fluorine gains the one electron

The correct name for SrCl2 is

strontium chloride

compound

two or more elements chemically combined. Ex: H20, sugar, exhaled air

mixture

variable, retains identity, but mixes