Chemistry - Unit 2 Test Prep (Chapters 4 & 5)
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35 Terms
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True or false? In naming ionic compounds, the cation is always named first and the anion second.
TRUE
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The correct name for LiCl is
lithium chloride
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The correct name for FeO is
iron(II) oxide
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Which of the following formulas is INCORRECT? (State correct answer)
CsCl2, (Correct would be CsCl)
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Titanium(IV) oxide has the formula
TiO2
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The correct name for P2O5 is
diphosphorus pentoxide
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What is the formula for sulfur trioxide?
SO3
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The formula for calcium hydrogen sulfate is
Ca(HSO4)2
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The correct formula for ammonium sulfate is
(NH4)2SO4
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Which of the following is named incorrectly? (Provide Correct name)
Fe(OH)2; iron(III) hydroxide. [It would actually be iron(II) hydroxide]
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The name for NH4Br is
ammonium bromide
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The name for Ba(NO3)2 is
barium nitrate
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The correct formula for sodium sulfide is
Na2S
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What is the formula for cobalt(II) chloride
CoCl2
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The correct formula for carbon monoxide is
CO
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The name for the compound Fe2O3 is
iron(III) oxide
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The name for the compund Al(OH)3 is
aluminum hydroxide
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The mass of a single atom is very small and is
measured using the
measured using the
unified atomic mass unit (u)
sometimes called the atomic mass unit (amu)
sometimes called the atomic mass unit (amu)
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The average atomic mass that is printed on the
periodic table is a
periodic table is a
weighted average that takes into
account that some isotopes are more common than
others
account that some isotopes are more common than
others
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what unit of measurement is used for measuring atoms?
The mole
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One mole of atoms =
6.022 x 10^ 23 atoms
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1 mole =
602,200,000,000,000,000,000,000
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the mole is also called
Avogadro’s Number
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Molar Mass =
the mass of one mole of an element’s atoms OR the mass
of one mole of a compound’s molecules
of one mole of a compound’s molecules
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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
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
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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
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
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diatomic molecule
a molecule made up of 2 atoms
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elements that exist as diatomic molecules when...
they are "free" in nature" (they're not bonded with anything else)
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the 7 diatomic elements are...
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Flourine (F2)
Chlorine (Cl2)
Bromine (Br2)
Iodine (I2)
Nitrogen (N2)
Oxygen (O2)
Flourine (F2)
Chlorine (Cl2)
Bromine (Br2)
Iodine (I2)
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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
The rest form a 7 shape in the nonmetals
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how do we remember the diatomic elements?
Henry (H2) Never (N2) Opens (O2) Fish (F2) Cans (Cl2) Because (Br2) Icky (I2)
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"Ide"
has no oxygen
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"Ite"
has some oxygen
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"ate"
has more oxygen than "ite"
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how to calculate average atomic mass
multiply precentage by the isotope number for each one and then add the three together