Give reason: (a) Rusting of iron is a chemical change but magnetizing and demagnetizing of iron is
a physical change.

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

How many moles are in 7.2 x 10^23 carbon molecules?

In an exothermic reaction at equilibrium, what is the effect of lowering the temperature? a. the reaction makes more products. b. the reaction makes more reactants. c. the reaction is unchanged.