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Which atom/ion below could have the following electron configuration:  1s2 2s2 2p6?

Pentane (C5H12) is burned in oxygen.  What type of reaction is this?

What type of reaction is the following: Na2O  +  H2O  –>  2 NaOH

Please type in the proper name for the following molecule:  TiCl4

What is the missing substance in the following equation: Pb(NO3)2(aq)   +  AlCl3(aq)  –>  _______  +  Al(NO3)3

The temperature of a 2.0 L sample of helium gas at STP is increased to 27 degrees Celsius, and the pressure is decreased to 80 kPa.  What is the new volume of the helium sample?

Given the following reaction: 2 SO2(g)  +  O2(g)    2 SO3(g) + heat When would this reaction be spontaneous (thermodynamically favorable)?

pH = 3.  What is the [OH-] concentration?

Given the following reaction: Ca  +  2 H2O  –>  Ca(OH)2  +  H2 How many moles of water are needed to react completely with 120 grams of Ca?

Given the following equation: 3 H2(g)  +  N2(g)    2 NH3(g)  +  heat