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Chemistry
| Question | Answer |
|---|---|
| How hott is the sun | 40,000,000 calvin |
| 1 calvin is equal to | 273 degrees F |
| helium in the sun is produced by | nuclear fusion of hydrogen |
| matter- gas | rapid random motion |
| matter- liquid | fluid motion, spaces inbetween particles. |
| liquids have what type of volume | constant volume |
| diffusion | movement of partivles for high to low area until dynamic equilibrium |
| are gasses conpressible | yes. highly |
| do gasses have a fixed volume or shape? | no they do not |
| matter- solid | fixed shape, fixed volume. particles vibrate within themselves (in fixed positions) |
| vapor | gaseous state of a liquid |
| submicroscopic level | scientists need to consider the atomic level of interaction |
| heterogenous mixtures | A mixture that does not have uniform composition and properties throughout. A sample of matter consisting of more than one pure substance and more than one phase.(chicken soup) has visible components (can be suspension or colloid) |
| homogeneous | A mixture which has uniform composition and properties throughout.A sample of matter consisting of more than one pure substance with properties that do not vary within the sample. cannot see individual components (salt and water) AKA SOLUTIONS |
| aqueaous solutions | a substance dissolved in water |
| suspensions | suspensions will eventually settle. An example of a suspension would be sand in water. Particles of suspensions show tyndall effect that is they are big enough to disperse light. (homogenized milk) |
| if the light pases through liquid straight then it is a | solution |
| light passes through liquid and spreads out then it is | tyndall effect |
| tyndall effect | scattering of visible liight in all directions due to particles being in the way |
| a heterogeneous mixture can be either | a coloid or a suspension |
| acectone is what? | highly volatole |
| colloid | (oil and water) A colloid will not settle if left to sit. Examples are jelly, glue,milk etc. |
| seperating mixtures | physical, settling, chromatography, fitration, distillation, |
| settling | let gravity do the work for you (ex density) |
| chromatography | seperation of particles (colors) |
| filtration | traps large particles in a peice of paper (ex sand/water) |
| distillation | based on things boiling at different temperatures (ex water and ethol) |
| how many naturally occuring elements are there? | 91 |
| can elements be broken down? | NO! |
| elements are | pure substances that cannot be broken down by chemical or physical means |
| how many known compounds are there?? | 10 million |
| can pure substances be broken down? | yes! they can be chemically broken down |
| what is used to break down compounds? | electrolysis is used |
| pure substances contain | atoms |
| homogeneous mixtures contain 2 different | atoms and compounds evenly mixed |
| heterogeneous contains 2 different | compounds unevenly mixed |
| are compounds pure substances or not? | yes they are pure substances |
| Law of multiple proportions | same elements can combine in different proportions |
| law of defininte proportions | compound are always the same (same proportion by mass) (ex water is always H2O) |
| Percent by mass | mass of element/mass of compound (100) <br/>a compounds percent of mass is always the same |
| addition and subtraction in sci. notation | when the (*10 to the __ power) is the same, the lease number of decimals present can only be present in the answer |
| multiplication and division in sci. notation | smallest number of sig figs in the equation can only be used in the answer |
| density equation | mass/volume=grams/mL=gram/cm3 |
| the volume of a liquid is always measured in | mL |
| volume of a cube is measured with | cm3 |
| 1mL= | 1cm3 |
| 1L= | 1dm3 |
| 1mL= | 1g |
| how do you read a graduated cylinder? | take the bottom reading (called the meniscus reading) |
| elements have 1 type | of atom |
| components have more than 1 type | of atom |
| what do you add to : acid to water or water to acid | add acid to water!!!! |
Created by:
LaurelM
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