10. a quantity of a gas has an absolute pressure of 400 kpa and an absolute temperature of 110 degrees kelvin. when the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (assume that there''s no change in volume.)
a. 1.702 kpa
b. 3.636 kpa
c. 854.46 kpa
d. 510 kpa

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.