In a science demonstration, a teacher mixed zinc (zn) with hydrogen chloride (hcl) in a flask and quickly attached a balloon over the mouth of the flask. bubbles formed in the solution and the balloon inflated. what most likely occurred during this demonstration? 1.the zn and hcl both retained their identity. 2.either zn or hcl, but not both, retained its identity. 3.evaporation of one of the substances occurred. 4.one or more new substances formed.

Answer;

4. One or more new substances formed.

Explanation;Chemical reactions are characterized by the formation of a new substance when reactants combine. Chemical reactions involves the rearrangement of atoms and molecules which results in the formation of new substances.In this case, Zinc reacted with HCl to form Zn chloride and hydrogen gas which are different from the initial substances. Production of bubbles indicates that a chemical reaction has occurred. Other indicators that a chemical reaction has taken place include; Color changeFormation of a precipitateTemperature change Odor change

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

The magnets would be | n s | and | s n|