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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Chemistry |
The study of the composition, properties, and transformation of matter |
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Substance |
Gases, liquids, and solids that can be hard & shiny or soft and dull |
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Hypothesis |
When the results of many experiments are known the results are taken to make a possible interpolation that explains the results |
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Theory |
The best explanation that can be given at any moment |
Hypothesis leads to (?) |
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Mass |
Kilogram (Kg) |
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Length |
Meter (M) |
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Temperature |
Kelvin (k) |
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Amount of substance |
Mole (mol) |
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Time |
Second (S) |
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Electric Current |
Ampere (A) |
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Luminous Intensity |
Candela (cd) |
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SI |
Metric system |
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SI Units |
1 Kg= 2.205 u.s lb 1g=0.001 kg 1mg=0.001g=10^-6kg microgram. (ųg; 1ųg=0.001mg=10^-6g=10^-9kg) Km=0.01m Mm(1)=1mm=0.001m Micrometer; ųm (1)=10^-6m Nanometer; 1nm=10^-9m Picometer;1 pm =10^-12m |
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Mass |
As the amount of MATTER in an object; measured in SI units by kg |
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Matter |
Used to describe anything with a Physical presence: anything you can toach, taste, or smell (matter is anything that has MASS) |
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Weight |
Is the measure of the force that gravity exerts on an object |
The mass of an object can be measured by comparing its weight to weight of a reference standard of known mass |
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Meter (m) |
Is the standard unit of length in the SI system |
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MUST KNOW |
Temp in K= Temp in °C + 273.15° Temp in °C = Temp in K - 273.15° |
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Derived units and quantity |
Area=m^2=L×L Volume= AxL=m^3 Density= mass per unit V=kg/m^3 Speed=distance per unit in time=m/s Acceleration=change in speed per unit time=m/s^2 Force=Mass×acceleration=(kg*m)/s^2(newton, N) Pressure=force per unit A=kg/(m*s^2)(Pascal, PA) Energy=Force×Distance=(kg*m^2)/s^2(joule,J) |
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Volume |
The amount of space occupied by an object, is measured in SI units by the Cubic meter (m^3), defined as the amount of space occupied by a cube 1 meter on edge. |
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Density |
Is the property that relates the mass of an object to its Volume;is simply the mass of an object divided by its V, is expressed in the SI derived unit g/mL for a liquid or g/cm^3 for a solid |
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Formulas to know |
density=mass/volume (d=m/v) Volume=mass/density (v=m/d) |
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Enegry |
It is the capacity to supply heat or do work; has the unit of mass (kg)×the square of capacity (m/s)^2 or (kg*m^2)/s^2 an SI derived unit that is given the name joule (J) |
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Calorie (cal) |
the amount of energy necessary to raise the temperature of 1 gram of h2o by 1°C 1 cal=4.184 J & 1J=0.2390 cal |
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Accuracy |
Refers to how close to the true value a given measurement |
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Precision |
Refers to how well a number of independent measurements agree with another |
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Significant figures |
The total # of digits recorded for a measurement |
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Significant figures rule #1 |
Zeros in the middle of a # are alike any other digit; they are always significant figures Thus 4.803 has 4 significant figures |
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Significant figures rules #2 |
Zeros at the beginning of a # are not significant; they act only to locate the decimal point. Thus, 0.00661g has 3 significant figures |
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Significant figures rules #3 |
Zeros at the end of a # and after the decimal point are always significant. The assumption is that TV heat zeros would not be shown unless they were significant. Thus 55.220 K has 5 significant figures |
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Significant figures rules #4 |
Zeros at the end of a # and before the decimal point may or may not be significant |
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