Balance the following oxidation-reduction equation:

NaHSO₄ + Al + NaOH ---> Na₂S + Al₂O₃ + H₂O

If an enriched radioactive isotope has a half-life of 8 minutes, what proportion would be left after 24 minutes?

(1) .083

(2) .125

(3) .166

(4) .25

(5) .5

Balance the oxidation-reduction equation below:

Cr₂O₃ + Na₂CO₃ + KNO₃ ---> Na₂CrO₄ + CO₂ + KNO₂

A mixture of water and AgCl is shaken until a saturated solution forms. Then the solid is filtered, and 100 mL of 0.03 M NaBr. is added to 100 mL of the filtrate. Should a precipitate form?

Write complete and balanced equatons for each of the following reactions:

(1) P₂O₅ + H₂O --->

(2) NaCl + AgNO₃ --->

(3) H₂SO₄ + NaOH (limited)

(4) FeCl₂ + AgNO₃ --->

Sketch and name all the possible linkage and stereoisomers of the following coordination compunds:

(a) [Pt(NH₃)₂(SCN)₂]

(b) [Co(en)(H₂NCH₂CO₂)₂]CI

The heat of combustion for 1m of carbon to carbon dioxide is -410 kJ. How many kJ of heat would escape from the combustion of 60.0 g of carbon?

(1) -65 kJ
(2) -1680 kJ
(3) -2050 kJ
(4) -135 kJ