Question

two solutions are added together and the new solution becomes hot. this * 2 points tells you that
a) a gas is being produced.
b) the solutions are not soluble.
c) the physical properties are the same.
d) a chemical change is taking place.

a solid brown metal is added to a clear acidic solution. a white powder appears and the acid solution becomes cloudy. which type(s) of change have/has occurred?
a) both chemical and physical
b) only physical
c) neither chemical nor physical
d) only chemical

Explanation:

When two solutions are mixed and the new solution gets hot, it indicates an exothermic chemical reaction is occurring, which is a chemical change. When a solid metal is added to an acidic solution and a white - powder appears and the solution becomes cloudy, a new substance (white powder) is formed (chemical change) and the clarity of the solution changes (physical change).

Answer:

1. d) a chemical change is taking place.
2. a) both chemical and physical