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17. Solve Problems How could you prove that
dissolving table salt in water is a physical
change, not a chemical change?

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?