Chemistry - Unit 2 Test Prep (Chapters 4 & 5)

True or false? In naming ionic compounds, the cation is always named first and the anion second.

TRUE

The correct name for LiCl is

lithium chloride

The correct name for FeO is

iron(II) oxide

Which of the following formulas is INCORRECT? (State correct answer)

CsCl2, (Correct would be CsCl)

Titanium(IV) oxide has the formula

TiO2

The correct name for P2O5 is

diphosphorus pentoxide

What is the formula for sulfur trioxide?

SO3

The formula for calcium hydrogen sulfate is

Ca(HSO4)2

The correct formula for ammonium sulfate is

(NH4)2SO4

Which of the following is named incorrectly? (Provide Correct name)

Fe(OH)2; iron(III) hydroxide. [It would actually be iron(II) hydroxide]

The name for NH4Br is

ammonium bromide

The name for Ba(NO3)2 is

barium nitrate

The correct formula for sodium sulfide is

Na2S

What is the formula for cobalt(II) chloride

CoCl2

The correct formula for carbon monoxide is

CO

The name for the compound Fe2O3 is

iron(III) oxide

The name for the compund Al(OH)3 is

aluminum hydroxide

The mass of a single atom is very small and is
measured using the

unified atomic mass unit (u)
sometimes called the atomic mass unit (amu)

The average atomic mass that is printed on the
periodic table is a

weighted average that takes into
account that some isotopes are more common than
others

what unit of measurement is used for measuring atoms?

The mole

One mole of atoms =

6.022 x 10^ 23 atoms

1 mole =

602,200,000,000,000,000,000,000

the mole is also called

Avogadro’s Number

Molar Mass =

the mass of one mole of an element’s atoms OR the mass
of one mole of a compound’s molecules

Element Examples: (of calculating molar mass)

a) hydrogen (as single atoms) has a molar mass = 1.01 grams/mole
b) oxygen (as single atoms) has a molar mass = 16.00 grams/mole
c) carbon (as single atoms) has a molar mass = 12.01 grams/mole

Compound Examples: (of calculating molar mass)

a) water (H 2 O molecules) has a molar mass of:
1.01 + 1.01 + 16.00 = 18.02 grams/mole
b) methane (CH 4 molecules) has a molar mass of:
12.01 + 1.01 + 1.01 + 1.01 + 1.01 = 16.05 grams/mole

diatomic molecule

a molecule made up of 2 atoms

elements that exist as diatomic molecules when...

they are "free" in nature" (they're not bonded with anything else)

the 7 diatomic elements are...

Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Flourine (F2)
Chlorine (Cl2)
Bromine (Br2)
Iodine (I2)

where do you find the diatomic elements?

Hydrogen is a squirrel by itself over in the tree of metals
The rest form a 7 shape in the nonmetals

how do we remember the diatomic elements?

Henry (H2) Never (N2) Opens (O2) Fish (F2) Cans (Cl2) Because (Br2) Icky (I2)

"Ide"

has no oxygen

"Ite"

has some oxygen

"ate"

has more oxygen than "ite"

how to calculate average atomic mass

multiply precentage by the isotope number for each one and then add the three together