Alayer of material that block the transfer of heat between the air inside and outside a building is called a. an active solar system. b. a solar cell. c. a heat exchanger. d. insulation.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume