What happens to the molecules of a substance during a chemical change? The molecules in the substance get larger or smaller.
During a chemical change, the substance's molecules stay the same.
Some molecules melt when they are combined with other molecules.
Bonds in the molecules are made or broken to form new molecules.

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign