Which sentence is true?
a). a physical change cannot be reversed.
b). a physical change causes new material
c). you can reverse a physical change
d). a change in state is not a physical change

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory