What must happen for heat to be transferred by thermal conduction A. Two molecules must collide with each other.
B. The sun must send out electromagnetic waves.
C. The kinetic energy must be equal in two objects.
D. The liquid or gas must circulate to move the heat.

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u. s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.

Ajar is tightly sealed at 22°c and 772 torr what is the pressure inside a jar after its been heated to 178°c