What type of energy transformation is taking place when natural gas is used to heat water?
a. chemical energy to thermal energy
b. thermal energy into mechanical energy
c. mechanical energy into electromagnet energy
d. electromagnet energy into chemical energy

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."