Which of the following can indicate a chemical change?
A. bubbles
B. melting
C, freezing
D. paper

Asmall amount of a solid is added to water. the observation made after fifteen minutes is shown in the figure. which of these solids has been probably added to water? a) oil b) sand c) sugar d) wood chips

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

How many moles of bromine are needed to produce 3.23 moles of potassium bromide