- Physical Sciences
the part of the Earth's hydrosphere that is made of frozen water.
a substance that can donate or accept a proton. It can act as an acid or a base.
the difference between the energy absorbed to break bonds and the energy transferred to the...
coal that is heated in the absence of air to about 1 000 Â°C to remove volatile substances.
substances such as elements or compounds, that cannot be broken down into simpler substances by...