# midterm review. chem.

 How many base units are in SI?
 seven
 What is a defined unit in a system of measurement that is based on an object or event in the physical world.
 base unit
 What is the base unit for time?
 second (s)
 What is the base unit for length?
 meter(m)
 What is the base unit for mass?
 kilogram (kg)
 What is the base unit for temperature?
 kelvin (k)
 What is the base unit for an amount of a substance?
 mole (mol)
 What is the base unit for electric current?
 ampere (a)
 What is the base unit for luminous intensity ?
 candela (cd)
 A meter is the distance that _ travels through a vacuum in 1/299 792 458 of a second.
 light
 What is the term for a space containing no matter?
 vacuum
 Giga … (give number)
 1 000 000 000
 Mega … (give number)
 1 000 000
 kilo.. give number.
 1000
 deci… give number.
 1/10
 centi.. give number
 1/100
 milli… give number
 1/1000
 A kilogram is about _._ pounds (give number)
 2.2
 A unit that is defined by a combination of base units is called a _ unit.
 derived
 Volume and density are measured in a. derived unitsb. base units
 a. derived
 _ is the space occupied by an object
 volume
 What is the derived unit for volume?
 cubic meter
 The metric unit for volume equal to one cubic decimeter is a _.
 liter
 _ are used to measure the amount of liquid in a contained of bottled water or a carbonated beverage.
 liter
 One liter = _ milliliters.
 1000
 _ is a ratio that compares the mass of an object to its volume.
 density
 The units for density are often _ per cubic centimeter.
 grams ….. (g/cm^3)
 What is the equation for density?
 d= mass/volume
 How can you remember the formula for density?
 I…loathe…density….
 The _ of an object is a measure of how hot or cold the object is relative to other objects.
 temperature
 Hot and cold are _ terms. a. qualitativeb. quantitative
 qualitative
 Name the two scales used for temperature.
 Celsius and Kelvin
 The Celsius scale was devised by..
 Anders Celsius
 On the Celsiusscale, Anders defined the freezing point as _ and the boiling point as _.
 0, 100
 The Kelvin scale was devised by a Scottish physicist and mathematician named..?
 William Thomson
 A _ is the Si base unit of temperature.
 kelvin
 On the Kelvin scale, water freezes at about _ K and boils at about _ k.
 273, 373
 Is the degree sign used for kelvin?
 no
 To convert Celsius into kelvins, you _aORb _ (in other blank name the number)a. subtractb. add
 To concert Kelvin to Celsius, you _aORb _ (second blank give number)a. addb. subtract
 subtract 273
 _ expresses numbers as a multiple of two facts.
 scientific notation
 What is a ratio of equivalent values used to express the same quantity in different units?
 conversion factor
 true or false. a conversion factor is always equal to one.
 true
 What is a method of problem-solving that focuses on the units used to describe matter.
 dimensional analysis
 true or false. dimensional analysis does not use conversion factors.
 false
 _ refers to how close a measured value is to an accepted value.
 accuracy
 ) refers to how close a series of measurements are to one another.
 precision
 What is the ratio of an error to an accepted value?
 percent error
 What is the formula to find percent error?
 percent error = (error / accepted value) times 100
 Significant figures include all known digits plus one estimated digit. true or false.
 true
x

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