Exam 2 Review

What are the 3 exceptions (elements) when drawing a Lewis structure?

• Beryllium, Boron, Hydrogen

• Beryllium, Boron, Helium

• Barium, Boron, Helium

• Beryllium, Bromine, Hydrogen

What makes an element/compound NONPOLAR!

• Lone pairs

• Non lone pairs

• Atoms around the CA are different

• Same # of atoms around the CA as sites of e- density

• Asymmetric

Which of these equations is balanced correctly

• H2 + 2O2 -> 2H2O
• 2H2 + O -> H2O2
• 2H2 + O2 -> 2H2O

• H2 + O2 -> H2O

Tags

NGSS.HS-PS1-7

What makes up an IONIC COMPOUND?

• An ionic compound is made up of cations and anions.
• Molecules and free radicals
• Only anions
• Only cations

Which of these compounds are named correctly? (Ionic naming)

• MgO = Magnesium Oxide

• KI = Potassium Iodine

• Li2S = Dilithium Sulfide

• Na3N = Sodium Nitride

Answer explanation

When doing ionic naming we need a metal (Cation) and an anion (Nonmetal)

The first element we just give it its name, but the second element we add "ide" to the end

Which of these compounds are named correctly? (Transition metal naming)

• CuSO4 = Copper Sulfate

• CrPO4 = Chromium (III) Phosphate

• SnS2 = Tin (IV) Sulfide

• FeCl3 = Iron (II) Chloride

Answer explanation

The charge for a single atom is equal to the roman numeral in the question

When both atoms have a subscript, the charge is equal to the subscript of the anion (second element)

When one or both atoms/ions dont have a subscript, the charge is based off of the anion (second element)

Should be Iron (III) Chloride and Copper (II) Sulfate

What makes up a covalent compound?

• A covalent compound is made up of nonmetals that share electrons.
• A covalent compound is formed by the transfer of electrons between atoms.
• A covalent compound consists of ionic bonds between nonmetals.
• A covalent compound is made up of metals that lose electrons.

Tags

NGSS.HS-PS1-1

Which of these compounds is named correctly? (Covalent naming)

• Cl2O7 = Dichlorine Heptoxide

• PCl3 = Phosphorus Trichloride

• OF2 = Monooxygen Diflouride

• LiC6 = Lithium Hexacarbon

Answer explanation

Covalent compounds are made up of 2 non-metals

You must use roman numerals to show the amount of atoms, EXCEPT for mono for the first element

Should Oxygen Difluoride

Lithium is not a nonmetal

Which of these is named correctly? (Acids)

• HNO3 = Nitric Acid

• H2CO3 = Carbonous Acid

• HI = Hydroiodic acid

• HF = Fluoric Acid

Answer explanation

"Ide" ending = Hydro-ic-acid

"ate" ending = ic ending

"ite" ending = ous ending

Should be carbonic acid and hydrofluoric acid

What happens in Oxidation?

• Loss of electrons + Becoming more negative

• Loss of electrons + being the oxidizing agent

• Gain of electrons

• Oxidation state = Reduce

• None of these are correct

Answer explanation

OIL = Oxidation is lose

You become more positive

Ox is the reducing agent

Tags

NGSS.HS-PS1-7