| A | B |
|---|
| the first step in the scientific method is | make an observation |
| any attempt to explain your observation is t he | hypothesis |
| chemistry is the study of | the composition and property of matter |
| matter is | anything that has mass and occupies space |
| The scientist that first organized scientific research into a format now called the scientific method is | Robert Boyle |
| organic chemistry is | the chemistry that involves carbon compounds |
| biochemistry invoves | chemicals in living organisms like hormones, enzymes |
| Eartly chemists that were involved with mysticism and experimentation were called | alchemist |
| data that is consistent time after time and is mathematically measurable is a | natural law |
| data that attempts to explain a natural phenomena is a | natural theory |
| the difference between a law and a theory is | a law is measurable |
| the composition or what something is made of is its | mass |
| mass is measured with a | balance |
| units of mass are | grams, kilograms ... |
| weight is | the effect of gravity |
| weight is measured with a | spring scale |
| units of weight | pounds, newton |
| SI unit of mass is | Kilogram |
| SI unit for temperature is | Kelvin |
| SI unit of volume | liter |
| SI stands for | international system |
| SI unit for number of something is | mole |
| how many base units are in one Kilo | 1000 |
| how many milli are in one base | 1000 |
| how many micros are in one base | 1,000,000 |
| the symbol for micro is | u |
| how many milli's are in one Kilo | 1,000,000 |
| how many sig figs are in 12000 | 2 ( trailing zeros don't cound it there is no decimal in the problem |
| how many sig figs are i n 12.000 | 5 , trailing zeros count if there is a decimal in the problem |
| how many sig figs are in0.000 120 | 3, leading zeros never count and there is a decimal so the trailing zero counts |
| how many sig figs are in 1256 | 4, all nonzero digits count |
| how many sig figs in 12001 | 5, captive zeros always count |
| round off 120055 to 4 sig figs | 120100 |
| round of 40915 to 3 sig figs | 40900 |
| reproducibility of measurements is the | precision |
| getting the outcome or value that you are suppose to get is the | accuracy |
| the formula for finding the density is | mass / volume |
| the formula for finding the specific gravity is | denisty of the substance / density of water at 4 deg cels |
| formul for finding the mass if you know,density and volume | density x volume = mass |
| formula for finding specific heat | heat energy / mass x change in temp |
| the amount of mass a substance has in a given volume is the | density |
| the density of water at 4 deg celsius | 1.0 g/ml |
| one ml is the same as | 1 centimeter cubed |
| freezing point of water in kelvin | 273 |
| freezing point of water in celsuis | 0 |
| freezing point of water in fahrenheit | 32 |
| boiling point of water in Kelvin | 373 |
| boiling point of water in celsius | 100 |
| the measure of the average KE of a substance is the | temperature |
| the four states of matter are | solid , liquid, gas , plasma |
| the state of matter that has the most KE is the | gas ( excluding plasma ) |
| a heat calorie is defined as | the amount of heat energy that it takes to change one gram ( ml ) of water one deg celsius |
| one calorie = ________ joules | 4.184 |
| heat energy can be measured in | calories, Calories, joules , kilojoules, |
| phase change from solid to liquid is called | melting |
| phase change from solid to gas is | sublimation |
| phase change from gas to solid is called | deposition |
| phase change from gas to liquid is | condensation |
| law of conservation of mass is | matter is neither created or destroyed it just changes from one thing to another |
| if the mass of the reactants is 4 grams hydrogen and 15 grams of oxygen how much water can be made | 19 grams of water |
| what elements are the semi metals | B, Si, As, Te, At, Po, ( sometimes Ge ) |
| What are the properties of metals | shiny, good conductors, high density, solid at room temp. malleable and ductile |
| what does malleable mean | bendable |
| what does ductile mean | stretch into a wire |
| what metal is liquid at room temp | Hg ( mercury ) |
| What nonmetal is liquid at room temp | Br ( Bromine ) |
| red elements on the periodic table are ____ at room temp | gas |
| blue elements on the periodic table ar ___ at room temp | liquid |
| What does black symbols on the periodic table represent | solid at room temp |
| what are some physical properties | color, density, hardness, solubility, phase change |
| is dissolving something physical or chemical | physical |
| is melting, freezing , evaporating chemical or physical | physical |
| what are some chemical changes | reacts with water, oxygen, combustable |
| is chewing food chemical or physical | physical |
| a physical combintion of two or more substances | mixture |
| chemical combination of two or more substances | compound |
| pure substances are either | compounds or elements |
| the simpliest pure substance that can not be broken down any further is | element |
| a physical combination of a substance that has uniform composition | homogenous mixture |
| a physical combination of two or more substances that does not have a uniform composition | heteogenous mixture |
| salt water, air are examples | homogenous mixture |
| oil water, sand water | heterogenous mixture |
| alloy | a homogenous mixture of two or more metals |
| methods of physcially seperating mixtures | distillation , filtration, magnetism, evaporation |
| sodium chloride NaCl is an example of | pure substance compound |
| evidence of a chemical reaction | permanent color change. release of gas, forming a precipitate , giving off or taking in heat, giving off light, forming water |
| Al(C2H3O2)3 has how many total atoms | 22 total |
