Wich of these is not a sign of chemical change 1 a gas is given off
2 the material dissolves.
3 a color change occurs.

2. The material dissolves

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

Second we need to identify the signs that indicate the occurrence of a chemical change

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19