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2012-09-22 20:21:05
vet tech chemistry measurements set

vet tech chemistry measurements set
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  1. Celsius temperatature scale
    • measured in degrees C
    • a temperature scale on which water has a freezing point of 0 deg C and a boiling point of 100 deg C.
  2. Centimeter (cm)
    • a unit of length in the metric system
    • there are 2.54 cm in 1 in
  3. Chemical
    a substance that has the same composition and properties wherever it is found
  4. Chemistry
    the science that studies the composition, structure, properties and reactions of matter
  5. Conversion factor
    • a ratio in which the numerator and denominator are quantities from an equality or given relationship
    • for example, the conversion factors for the relationship 1kg = 2.20 lbs are written as:
    • - 2.20 lb 1 kg
    • ------- and ---------
    • 1 kg 2.20 lb
  6. Cubic centimeter (cm3 or cc)
    • the volume of a cube that has 1-cm sides
    • 1 cc = 1 ml
  7. Density
    • the relationship of the mass of an object to its volume expressed as grams per cubic centimeter (g/cm3), grams per milliliter (g/ml) or grams per liter (g/L)
    • Density = Mass / Volume or D = M/V
  8. Equality
    a relationship between two units that measure the same quantity
  9. Exact number
    a number obtained by counting or by definition
  10. Floating and Sinking
    • a substance floats in water if its density < that of water
    • a substance will sink in water if its density > that of water
  11. Gram (g)
    the metric unit used in measurement of mass
  12. International System of Units (SI)
    an international system of units that modifies the metric system
  13. Kelvin temperature scale
    • measure in K (no degrees)
    • a temperature scale on which the lowest possible temperature is 0 K
  14. Kilogram (kg)
    • a metric mass of 1000 g
    • equal to 2.20 lb
    • SI standard unit of mass
  15. Length
    the distance from one point to another
  16. Liter (L)
    the metric unit for volume that is slightly larger than a quart
  17. Mass
    • a measure of the quantity of material in an object
    • the amount of matter in an object
  18. Measured number
    • a number obtained when a quantity is determined by using a measuring device
    • numbers that you have read from an instrument
    • always includes one estimated value
  19. Meter (m)
    • the metric unit for length that is slightly longer than a yard
    • SI standard unit of length
  20. Metric System
    a system of measurement used by scientists and in most countries in the world
  21. Milliliter (mL)
    • a metric unit of volume equal to one-thousandth of a liter
    • 1 mL = 0.001 L
  22. Prefix
    • the part of the name of a metric unit that precedes the base unit and specifies the size of the measurement
    • all prefixes are related on a decimal scale:
    • - Kilo (k) = 1000 or 10**3
    • - Centi (c) = 1/100 or 0.01 or 10**-2
    • - milli (m) = 1/1000 or 0.001 or 10**-3
    • - micro (u) = 1/1,000,000 or 0.000001 or 10**-6
  23. Scientific Notation
    a form of writing large and small numbers using a coefficient that is a least 1, but less than 10, followed by a power of 10
  24. Second (s)
    • a unit of time
    • used in both SI and metric systems
  25. Significant figures (SFs)
    the numbers recorded in a measurement
  26. Significant figures rules
    • all non-zero digits are always significant (last digit is always estimated)
    • zeroes are significant if:
    • - they fall between numbers
    • - they fall after numbers and before or after a decimal point
    • when multiplying or dividing:
    • - round off your answer to the same # SFs as the term with the least # of SFs
    • when adding or subtracting:
    • - round off your answer to the same decimal position as the term with the least precision
  27. Specific gravity
    SG = density of a substance / density of water (1.00 g/ml at 4 deg C)
  28. Temperature
    • an indicator of the hotness or coldness of an object
    • the average kinetic energy of a substance
  29. Volume
    • the amount of space occupied by a substance
    • the amount of space something takes up