Balanced or Unbalanced? Write a “B” for Balanced and a “U” for Unbalanced. 11.CH4 + O2 à CO2 + 2 H2O
12. NaBr + CaF2 à NaF + CaBr2
13. 4 Fe + 3 O2 à 2 Fe2 O3

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.