1.) which of these is the balanced equation for this reaction?
a.) ch4 + o2 → co2 + h2o
b.) ch4 + o2 → co2 + 2h2o
c.) ch4 + o2 → co2 + 4h2o
d.) ch4 + 2o2 → co2 + 2h2o

2.) carbon monoxide burns readily in oxygen to form carbon dioxide. co + o2? co2 what coefficient values will balance the reaction shown above?
a.1,1,1
b.1,2,2
c. 2,1,2
d. 2,2,1

3.) which of these is the balanced equation for this reaction?
a.) sio2 + 4hf → sif4+ h2o
b.) sio2 + hf → sif4 + 2h2o
c.) sio2 + 2hf → sif4 + h2o
d.) sio2 + 4hf → sif4 + 2h2o

4.) which of these is the balanced equation for this reaction?
a.) as + naoh → na3aso3 + h2
b.) as + naoh → 3na3aso3 + h2
c.) as + naoh → 3na3aso3 + 3h2
d.) 2as + 6naoh → 2na3aso3 + 3h2

5.) which of these is the balanced equation for this reaction?
a.) sici4 + h2o → sio2 + 2hci
b.) sici4 + h2o → sio2 + 4hci
c.) sici4 + 2h2o → sio2 + 4hci
d.) sici4 + 4h2o → sio2 + 4hci