38 when a sample of a gas is heated in a sealed, rigid container from 200. k to 400. k, the pressure exerted by the gas is
(1) decreased by a factor of 2.(2) increased by a factor of 2.
(3) decreased by a factor of 200.(4) increased by a factor of 200.

What must happen before a body cell can begin mitotic cell division

The characteristic 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 and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.