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| steps of the scientific method |
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Definition
1. observation 2. hypothesis 3. perform experiment 4. repeat |
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hypothesis: not proven theory: almost fact, has been tested with many experiments |
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theory: can change law: it's true |
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| physical property: definition and examples? |
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Definition
| something that can be observed w/o performing a chemical change: color, 5 cm long |
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| chemical change vs. physical change |
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Definition
chemical change=must change actual atoms composition physical change=can be reversed |
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you can see difference between particles in mixture |
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| . What is the common name for a homogeneous mixture? |
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Definition
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Describe how the process of distillation works. |
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Definition
| has to do with boiling water and evaporating water and stuff is left behind |
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Term
| difference between element, compound, and mixture |
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Definition
element=1 element compound=2+ elements (usually will be a written out compound) mixture=2+ elements (usually a common object) |
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| law of conservation of mass and energy |
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Definition
| mass and energy are neither destroyed or created |
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Term
| observation vs. inference |
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Definition
observation: you see it happen inference: an opinion/don't actually observe it |
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| qualitative and quantitative observations |
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Definition
qualitative: w/o numbers quantitative: with numbers |
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Definition
accuracy:close to actual answer (if actual answer is 3, accuracy is 3,3.5,4,2) precision:answers close together to each other (if answer=3, precision is 8,9,10,11) |
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know how to write in scientific notation try: 30000 and .0005 |
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Definition
30000=3.0 x 10^4 .0005= 5.0 x 10^4 |
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Definition
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Name the metric unit for: a. mass b. volume c. length d. heat |
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Definition
A.grams B.liters C.meter D.celcius |
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| difference between mass and weight |
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Definition
mass: how much matter is in an object weight: mass and gravity together |
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| how can you predict if something will sink or float? |
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Definition
if it has a density less than water, it will float but, more, and it will sink. |
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Term
put these in order from largest to smallest meter, hectameter, centimeter, decimeter, millimeter, kilometer, dekameter |
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Definition
kilometer, hectameter, dekameter, meter, decimeter, centimeter, millimeter (Karen hailed down 1 darn cab, man!!) |
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Term
An element with an equal number of protons and electrons is called a(n)______. |
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Definition
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Definition
the elements surrounding the squiggly line on the periodic table of elements. |
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binary=2 elements ternary=3+ elements |
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acid-starts with hydrogen molecular-2 nonmetals ionic-metal and nonmetal |
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| i don't know the difference... |
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| double replacement, single replacement, decomposition, combustion, synthesis |
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Definition
synthesis=coming together double replacement=cations switch single replacement=cation switches with other decomp=breaks down combustion=products are H20 and CO2 |
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Term
- What are the products when ANY hydrocarbon is burned?
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What dangerous products are formed through incomplete combustion? |
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STUDY HOW YOU KNOW IF RXN's WORK!!! |
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Definition
study pink sheet - one of reactants must be an aqueous solution
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| exothermic reaction vs. endothermic reaction |
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Definition
exo-energy given off, number is a product, delta H is negative endo-energy absorbed, number is a reactant, delta H is positive |
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