All the following are signs of a chemical reaction, except

a. a change in color or odor.
b. a release of gas.
c. a change of state.
d. a change in energy.

How air particles exert a pressure on the inside of the balloon

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided