HISTORY
Chem test 1_Matter and Measurement.pdf

Exothermic energy is given off in a chemical reaction

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Exothermic: energy is given off in a chemical reaction -
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- Endothermic: energy is absorbed in a chemical reaction - Measured in joules - kilojoule= 1000 joules Temperature: a measured of the average kinetic energy of the molecules, thermometer Kelvin:SI unit - Absolute zero- lowest possible temperature, written as 0 K or -273 C - K= C+273 Freezing point - 0 C freezing point of water also called ice-water equilibrium temperature Boiling point - 100 C boiling point of water, also called water steam equilibrium temperature F= 1.8C+32 Precision: the closeness of a series of measurements to one another Accuracy: The closeness of a measurement to an accepted value Length: Meter - 10mm= 1cm - 100cm= 1m - 1000m=1km Time: Sec Amount of substance:Mole Mass - 1000mg=1g - 1000g=1kg Volume - 1000ml=L - 1000cm3=L Derived Units; 2 or more base units ex miles per hour Significant Figures - Certain digits: remain the same regardless of who makes the measurement - Uncertain digits: estimated digits - Last digit is always uncertain - Rules; 1) All nonzero digits are significant 2) Zeroes between two significant figures are sig 3) Zeros at the beginning of a number are never sig 4) Zeros at the end of a number are sig if a decimal point is written in the number STP: standard temperature pressure - 1 atmospheric pressure - 273 K
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