Determining Chemical Formulas Chemistry

Balance the following reaction. 2Ca 3 (PO 4 ) 2 + ____ C + 6SiO 2 → ____ CaSiO3 + P4 + ___CO

10, 6, 10 2Ca 3 (PO 4 ) 2 + (10) C + 6SiO 2 → (6) CaSiO3 + P4 + (10) CO

Balance the following reaction. ___ As2 S3 + 9O2 → 2As2 O3 +__ SO2

2,6 (2) As2 S3 + 9O2 → 2As2 O3 + (6) SO2

Balance the following reaction. P 4 + __ O 2 → 2P 2 O 5

5 P 4 + (5) O 2 → 2P 2 O 5

Predict the chemical formula for a compound between Al and S.

Al 2 S 3

Predict the chemical formula for a compound between aluminum and chlorine.

AlCl 3

Predict the formula for Ba +2 and S -2 .

BaS

Predict the chemical formula for a compound between calcium and chlorine.

CaCl 2

If D +2 would react with E -1 , what do you predict to be the formula?

DE 2

In the following table, all the columns for the element calcium are filled out correctly. calcium 1s2 2s2 2p6 3s2 3p6 4s2 1s3 2s2 2p6 3s2 3p6 4s1 +1

False

Write the chemical formula for the following compound: Iron (III) fluoride

FeF3

Choose the correct name for the following compound: H2S

Hydrogen sulfide

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (Use the periodic table as necessary.) GroupMost Likely Ionic Charge# of Valence Electrons I +1 II +2 III +3 IV +4 or -4 V -3 VI -2 VII -1 VIII 0

I+1: 1 II +2 : 2 III +3 : 3 IV +4 or -4 : 4 V -3 : 5 VI -2 : 6 VII -1 : 7 VIII 0 : 8

Predict the chemical formula for a compound between lithium and oxygen.

Li 2 O

Choose the correct name for the following compound: NaCl.

Sodium chloride

Explain your reasoning for your formula prediction for Ba +2 and S -2 .

The total charge of cations plus anions must equal zero

In the following table, all the columns for the element nitrogen are filled out correctly. nitrogen 1s2 2s2 2p3 1s2 2s2 2p6 -3

True

In the following table, all the columns for the element oxygen are filled out correctly. oxygen 1s2 2s2 2p4 1s2 2s2 2p6 -2

True

cation ion anion ion charge

a positively charged ion a charged particle a negatively charged ion the net charge an atomic particle carries

Name the following compound: Cu2S

copper(I) sulfide

In the following table, all the columns for the element beryllium are filled out correctly. beryllium 1s2 2s2 1s1+2

false

Do the positive ions tend to be metals or nonmetals?

metals

Would the two as yet undiscovered elements A +1 and D +2 react?

no

Do the negative ions tend to be metals or nonmetals?

nonmetals