Chemistry Post-Lab Quizzes 4b-7

What is the formula of the compound formed by calcium and phosphate ion? a. CaPO4 b. Ca(I) (PO)4 c. C(PO4) d. Ca3(PO4)2

Ca3(PO4)2

What is the formula of the compound made of calcium and the carbonate ion? a. Ca(CO3)2 b. CuCO3 c. CaCO3

CaCO3

What is the formula for calcium chloride? a. CuCl b. CaCl c. CaCl2 d. CuCl2

CaCl2

What is the formula for copper (II) chloride? a. CuCl b. Cu2Cl c. CuCl2 d. CaCl2

CuCl2

What is the formula for iron (III) oxide? a. AlO b. Fe2O3 c. Ir2O3 d. Al3O2

Fe2O3

How do you determine an element's ionization energy?

Ionization Energy increases as you go from left => to right on the Periodic Table

As you move from left to right on the periodic table, what generally happens to the ionization energy?

It increases

Which of the following would be least conductive when dissolved in water? a. CH2O b. Ca2O c. Na2O d. KCl

CH2O This does not conduct electricity because it is a molecular compound and CH20 are all nonmetals

Which substance has the lowest boiling point? a. C3H8 b. C2H6 c. CH4 d. C4H10

CH4 The strength of a bond between two atoms increases as the number of electron pairs in the bond increases

What is ionization?

the removing electrons from an atom

What charge would the ion formed from these atoms have? Ca

+2

What charge would the ion formed from these atoms have? Cl

-1

What are the subscripts you would add to the combination of Ca and Br to generate a formula?

1,2

What subscripts would you add to a mixture of Al and O to generate a neutral compound?

2,3

How many electrons does the atom Bromine have? (Br)

35 (Remember: atomic #, proton #, electron # are same)

How many protons does the atom Bromine have? (Br)

35 (Remember: atomic #, proton #, electron # are same)

How many valence electrons does Bromine have?

7 (the outer most ring)

How many electrons does Bromine have in its third shell?

8

Which of the following is NOT a polar molecule? a. CH2O b. H2O c. NH3 d. C2H6

C2H6 Any molecule with lone pairs of electrons around the central atom is polar. Hydrogen and carbon have similar electronegativity values, so the C—H bond is not considered a polar molecule

Which of these will have a temporary dipole? a. HCN b. CH3OH c. CH2Cl2 d. CCl4

CCl4 ....

Which of the following is a covalent compound? a. KCl b. Cl2 c. CO2

CO2 Covalent compounds are formed when 2+ nonmetals combine

Which of the following is most conducive when dissolved in water? a. CO2 b. CaCl2 c. NaCl d. H20

CaCl2 The more ions, the more conductive a solution will be So calcium chloride will disassociate into one calcium ion dissolved in the water and two chloride ions also dissolved in the water or a total of three ions!

Which of the following is an ionic compound? a. H20 b. MgO c. CH3OH

MgO Ionic compounds form when an atom (or group of atoms) gains or loses electrons

Which of the following has the greatest electronegativity? a. O b. S c. N d. P

O Oxygen is smaller than Sulfur. Since electronegativity is inversely related to size, (i.e., the smaller the atomic size higher is the electronegativity of the atom), oxygen is more electronegative than Sulfur.

What substance has the highest boiling point? a. Cl2 b. CF4 c. CH3CH3 d. PH3

PH3 Boiling point is highly dependent on the intermolecular forces of a compound. Compounds with stronger intermolecular forces, (larger masses), and less branching will have higher boiling points.

What is the name of Al(NO3)3? a. aluminum (III) nitrate b. aluminum nitrate c. aluminum (III) nitride d. aluminum nitride

aluminum nitrate

What is the name of N2O? a. dintrogen monoxide b. dinitrogen oxide c. nitrogen monoxide d. nitrogen oxide

dinitrogen monoxide

What is the name of ICl? a. iodine monochloride b. monoiodine monochloride c. Iodide monochloride d. monochloride chloride

iodine monochloride

What is the name of Mg(OH)2? a. magnesium oxide b. magnesium (II) hydroxide c. magnesium hydroxide d. magnesium (II)

magnesium hydroxide

What is the name of NO2? a. nitrogen oxide b. nitrogen dioxide c. mononitrogen dioxide d. mononitrogen oxide

nitrogen dioxide

What is the name of Na2CO3? a. sodium carbon oxide b. sodium (I) carbonate c. sodium carbonate d. sodum hydroxide

sodium carbonate