Chem Exam 2

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What is the mass of one mole of carbon atoms?

12.01 g

Determine the number of moles in 50.0 grams of sodium

2.17 g

Determine the number of moles in 3.00 x 10²¹ atoms of calcium.

4.98 x 10⁻³ moles

Avogadro's number

6.02 x 10^23

Convert 6.50g of Copper (Cu) into moles Cu

6.50g / 1 x 1 mol Cu / 63.546g Cu = 0.1023g Cu

The recommended daily allowance of niacin (Vitamin B3) - C6H5NO2 - is 14.0 mg/day for women. Calculate the number of molecules of niacin in 14.0 mg

6.85 x 1019

Based on their positions in the periodic table, which of the following bonds is the most polar?

B - F

What would be the correct formula for a compound comprised of Barium and Sufur?

BaS

Write the chemical formula for bromine pentachloride

BrCl₅

What is the correct formula for Carbon Tetrafluoride?

CF4

What type of bond would occur between Phosphorous and Oxygen?

Covalent

Which of the following bonds is a nonpolar covalent bond?

F - F

Which element has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²?

Ge

Which of the following bonds is a polar covalent bond?

H - Cl

The molecule NaBr is:

Ionic

What type of bond would be formed between Potassium and Iodine?

Ionic

Which of the following is an example of an ionic bond?

Na - O. A bond between a metal and non-metal

What would be the correct name of the following compound? RbCl

Rubidium Chloride

What would be the correct name of the following compound? Na2SO4

Sodium Sulfate

Write the chemical formula for tellurium hexaiodide

TeI₆

Electronegativity

ability to attract electrons

What is the correct IUPAC name for AlBr₃?

aluminum bromide

Valence electrons

are the outermost, highest energy electron

Ions

atoms will gain or lose electrons to have 8 valence electrons - form ions

What is the correct IUPAC name for BrCl₃?

bromine trichloride

What is the correct IUPAC name for As₂S₅?

diarsenic pentasulfide

non polar covalent bond

equal sharing of electrons

Anions

gain electrons, become more negative (non-metals) (written with "ide")

Cations

lose electrons, become more positive (metals)

1,2,3,4,5,6

mono, di, tri, tetra, penta, hexa

Mole

one mole of an element = is equal to its amu

Which of the following best describes what happens when an ionic bond forms?

two atoms, one atom which is more electronegative than the other, exchange electrons and the charges hold the atoms together.

Polar covalent bonds

unequal sharing of electrons (dipole movement)

Atoms are most stable:

when they have 8 electrons in their valence shell (exceptions: H & He)

What is the electron configuration for Al?

1s²2s²2p⁶3s²3p¹


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