Question |
Answer |
matter |
anything that has mass, made of atoms and molecules |
physical change of matter |
caused by motion, temperature, pressure – substance stays the same |
chemical change of matter |
happen on a molecular level – substance changed |
Conservation of Mass |
(Lavoisier) matter is neither created or destroyed |
Conservation of Energy |
(Mayer) aka First Law of Thermodynamics – energy is neither created or destroyed |
Law of Conservation of Mass-Energy |
(Einstein) the total amount of mass and energy in the universe is constant |
kinetic energy |
energy of moving objects; energy in use |
potential energy |
stored energy; it is energy that has the potential to do work |
oxidation reduction reactions |
transfer energy between molecules in the form of electrons – the molecule that loses an electron is oxidized, molecule that gains electron is reduced |
endergonic reactions |
store energy within a molecule because the reactants have less free energy than the products – require energy input |
exergonic reactons |
release energy, laving reactants with more free energy than the products |
heat |
(amount of energy in a system) total energy in a substance – kinetic energy of molecules AND potential energy of molecules |
temperature |
(measure of the average moleculation motions in system) average kinetic energy of the molecules of the substance |
conduction |
materials in physical contact – energy transferred trough collisions of their particles, Kinetic Theory of Matter |
convection |
movement of thermal energy from one area to another in a liquid or gas |
radiation |
warm or hot matter emits electromagnetic radiation – especially infrared – that is then absorbed by an object at a distance, absorption heats the second object |
calorie/joules |
1 cal = 4.186 J |
BTU |
amount of energy necessary to raise temperature of 1lb water to 1 degree fahrenheit |
First Law of Thermodynamics |
energy can be transferred from one sysem to another – energy cannot be created or destroyed – total amount of energy in universe is constant |
Second Law of Thermodynamics |
heat cannot transfer from colder to hotter body – all natural processes that involve energy must have one direction, natural processes are irreversible, disorder/randomness of isolated system always increases with time |
atom |
smallest unit of element that displays all of that elements characteristics |
protons |
positively charged particles located within the atomic nucleus |
neutrons |
neutral particles located within the atomic nucleus |
electrons |
negatively charged particles orbiting around nucleus |
atomic number |
protons in an atom |
atomoic mass |
protons and neutrons combined |
first electron shell |
one orbital; two electrons |
second electron shell |
four orbitals; eight electrons |
third electron shell |
four orbitals max; eight electrons |
fourth electron shell |
max nine orbitals; eighteen electrons |