Five cubes of iron are tested in a laboratory. the tests and the results are shown in the table below

which tests demonstrate chemical properties?
(1) 1, 3, and 4
(2) 1, 3, and 5
(3) 2 and 4
(4) 2 and 5

A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity When a substance goes under a chemical reaction, the properties will change drastically, resulting in chemical change. So from the test it is test 2 and 4

The answer is c. 320 g