Question | Answer |
What is a scientific theory? | a well tested explanantion for a broad set of observations. |
what is mass? | a measure of the amount of matter than an object contains. |
what is vapor? | a liquid or solid at room temperature. |
what is a solid? | has definite shape and volume |
what is a liquid? | has an indefinite shape, but has a fixed volume |
what is a gas? | takes both shape and voume of the container. |
what are examples of physical properties? | how it looks, what shape, and color |
what are examples of chemical properties? | what an element is made out of |
what is a hetergeneous mixture? | a mixture in which the compositon is not uniform throughout |
what is a homogeneous mixture? | a mixture in which the composition is uniform throughout |
what is a mixture? | a physical blend of two or more components? |
what is a compound? | a substance that contains two or more elements chemically combined |
what is the law of conservation of matter? | it states that in any physical change or chemical reaction, mass is conserved. |
what is scientiic notation? | an expression of numbers in the form m * 10^n where m is equal to or greater than 1 and less than 10, and n is an integer. |
what are significant figures? | all digits that can be known precisely in a measurement, plus a last estimated digit. |
what is accuracy? | a measure of how close a measurement comes to the actual or true value of whatever. |
what is precision? | a measure of how close a series of measurements are to one another. |
what is the si unit for length? | meter; is the si unit for what |
what is the si unit for mass? | kilogram; is the si unit for what |
what is the si unit for time? | second; is the si unit for what |
what is weight? | a force that measures the pull on a given mass by gravity. |
formula for density? | D=m/v ; is the formula for what |
first idea of atoms? | Democritis |
overall charge of atom? | neutral |
how many electrons are in the FIRST priniciple energy level? | 2 |
how many electrons are in the SECOND priniciple energy level? | 8 |
how many electrons are in the THIRD priniciple energy level? | 18 |
how many electrons are in the FOURTH priniciple energy level? | 32 |
what is the Aufbau priniciple? | the rule that electrons occupy the orbitals of lowest energy first. |
what is hund's rule? | electrons that occupy orbitals of the same energy in a way that makes the number of electrons with the same spin direction as large as possible. |
what is the pauli exclusion prinicple? | am atomic orbital may describe at most two electrons, eacg with opposite spin direction. |
what is wavelength? | distance between crests |
what is frequency? | number of wave cycles to pass a given point per unit of time. |
what is a photon? | a quantum of light; a discrete bundle of electromagnetic energy that interacts with matter similarity to particles. |