Calculate the standard enthalpy of formation of ethanoic acid given that the standard enthalpy of combustion for carbon is –394 kj mol-1 , hydrogen is –286 kj mol-1 and ethanoic acid is –876 kj mol-1

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?

Which system of units is used by only a small number of countries in the world, including the u.s.