The heat of combustion of methane (CH2) is -890 kJ mol-1. a) Write a thermochemical equation for the complete combustion of methane.
b) Determine the mass of methane (in g) that has to be burnt in order to heat 500 mL of water from 20.0°C to boiling. Assume all the heat released was used to heat the water.

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?