Quiz 3 practice                      CHEM 20                    Name_________________

1      Give a brief deffinition of the following terms.

a) Compound     Two or more elements bonded together in definite proportions.

b) Anion    A negative ion.

c) Diatomic molecule    A two atom molecule

d) Amorphous     With out form. In relation to substances, an irregular atomic or molecular arrangement.

2     Give the name for the following symbols.

Hg ____Mercury___ Ar _____Argon___

Au ___Gold_____ Pb _____Lead____

3     What would be the density of a solution made by mixing 2.50 mL of carbon tetrachloride (CCl4, d=1.595 g/mL) and 3.50 mL of carbon tetrabromide (CBr4, d=3.420 g/mL)? Assume that the total volume of the mixed liquids is the sum of the two volumes.

D = [total mass]/[total volume]  = [volume1D1 +  volume2D2]/[volume1 +  volume2]

4      Give the symbols for each of the following elements.

a) Silver___Ag_____ b) Chromium ____Cr____ c) Potassium___K____

d) Iron ____Fe____ e) Phosphorous ___P___ f) Copper _____Cu___

5    How many hydrogen atoms are present in each of the following expressions?

a) [Fe(NH3)6](OH)2 ___20___ b) Mn(OH)2 ___2____

c) Cr(OH)3 ___3____ d) (NH4)2HPO4 __9_____