How should you manipulate these equations so that they produce the equation below when added? Check all that apply.
CaO(s) + CO2(g) - CaCO3(s)
reverse the direction of equation (2)
multiply equation (1) by 3
multiply equation (2) by 1/2

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Chromosome 17 is made of over million base pairs.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.