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CHEM FINAL
12/17/25
| Question | Answer |
|---|---|
| what to wear in the lab | gloves, glasses, etc |
| what do you do when something happens in the lab | tell the teacher |
| how to clean up | ask teacher about disposal |
| formula for density | density=mass/volume |
| DMV triangle | mass on top, density on the bottom right, volume on bottom left |
| mass | the amount of matter in an object, constant everywhere |
| weight | the force of gravity on the mass, and changes depending on the gravitational pull |
| if there is a decimal present for scientific notation, what do you do? | go from the decimal to to the right and then start counting at the first non-zero number |
| if there is not a decimal prestent, what do you do? | start counting from the right and then go to the left and start at the first non zero number |
| when adding/subtracting, the answer should have the same number of decimals as the | limiting term (least number of decimals places) |
| when multiplying/dividing, the answer should be the number of significant figures as the | limiting term (least number of decimal places) |
| 4 states of matter | solid, liquid, gas, plasma |
| examples of a chemical change | change in the chemistry:change in substance (burning, reacting) |
| example of chemical property | property you can observe by reaction (reactivity) |
| examples of a physical change | (boil, melt) change of state: still the same substance |
| example of a physical property | can observe with the senses (color, mass) |
| what is an atom | smallest particle of an element |
| what is a molecule | a group of bonded atoms, one functioning unit |
| example of a pure substance | table salt, single kind of matter that cant be separated - this is any element |
| examples of an element | copper, oxygen, gold, any from periodic table |
| examples of a compound | salt, baking soda, sugar, H2O |
| examples of heterogenous mixture | salad dressing, blood, dirt, milk, concrete |
| examples of a homogeneous mixture | silver-mercury amalgam, lemonade, gasoline, black coffee |
| atom | the smallest particle of all matter that retains the properties of the elements |
| isotope | atoms with the same number of protons but different numbers of neutrons |
| proton | positively charged particle |
| neutron | particle with a neutral charge |
| atomic number | number of protons in the atom |
| mass number | total of protons and neutrons in an atoms nucleus |
| atomic number = | number of protons |
| mass number = | number at the bottom of the symbol on the periodic table |
| number of neutrons = | number of protons usually |
| number of electrons = | mass number - atomic number |
| know who Democritus is and what he did | first to talk about atoms |
| know who John Dalton is and what he did | atomic theory |
| how many families/groups on the periodic table | 18 |
| how many series / periods on the periodic table | 7 |
| aufbau's | states that electrons must fill orbitals lowest energy to highest |
| Pauli Exculsion Principle | states that the particles in the same orbital have opposite spins |
| Hund's | states that each orbital must be filled with a single electron before any orbital may contain two electrons |
Created by:
user-1777988