vocabulary
mole
an amount of a substance that contains approximately 6.2 times 10 23 particles of the substance
Endothermic reaction
a chemical reaction that absorbs energy from its surroundings
how do chemical reactions involve energy
energy is ether absorbed or released
Exothermic reaction
A chemical reaction that releases energy to its surroundings
polyatomic ion
a covalently bonded group of atoms that has a positive OR negative charge and acts as a unit
Binary compounds
compounds mane of only two elements