CollChem Horne Test 1
5m =
.005 km
what is the density of a sample that has a mass of 300g and volume of 2300 cm^3
.13 g/cm^3
3050 cm^2 =
.3050 m^2
1 cm^3 =
1 mL
1 m =
100cm
practice problem.. using the unit analysis method, find the number of kilometers in 15 miles (given that 1 mile=1.61 kilometers
24.15 kilometers
how many sigfigs in... 50.0
3
sig fig example.. how many SF's in this number.... 0.0520
3, the 520 at the end of the number, this is becaise all non zero digits are considered significant, and trailing zeros are only significant if there is a decimal present and this zero must be on the right side of the decimal.
.03 s =
30 ms
.0071 kL =
7100 mL
accuracy
A description of how close a measurement is to the true value of the quantity measured.
gram
A gram is the mass/weight equal to 1/1,000 of a kilogram and is roughly equivalent to the mass of one cubic centimeter of water.
scientific notation
A method of writing or displaying numbers in terms of a decimal number between 1 and 10 multiplied by a power of 10.
the basic unit of temperature in the English system
Fahrenheit degree
significant digits (figures)
The non-place-holding digits in a reported measurement; they represent the precision of a measured quantity.
Measurment
a quantity that has both a number and a unit
kelvin scale
a temperature scale that begins at absolute zero Celicus + 273 = Kelvin
mass
amount of MATTER not weight, measured in grams
uncertainity
an estimate of how much a measured or calculated value differs from a true value
Temperature
average kentic energy, kelvin, measured with a thermometer
second
base unit for time, measured with a stopwatch
liter
baseunit- liter L, measured with a gradulated cyclinder
a common metric unit of length
centimeter
Precision
consistantly hitting the same value repeatingly
a statment of two equivalent values. for example= 1 foot= 12 inches
exact equivalent
the flow of energy from an object at a higher temp to an object at a lower temp
heat
a comprehensive system of measurement with seven base units
international system
sig fig example... how many SF's in this number 0.06
just 1 (the 6) Because leading zeros are never significant
the basic unit of temp in the metric system
kelvin unit
the basic unit of volume in the metric system
liter
length
measured in meters, with a ruler
a numerical value and unit that expresses a physical quantity such as length
measurment
the digits in a measurment that exceed the certainity of the intrusment
non sigficant figures
exact numbers
numbers without uncertainity, it is a true measurment
the relationship between a fraction and its inverse, for example, 1qt/946mL and 946mL/1qt
reciprocal
the certain digits in a measurment plus one estimated digit
sig figs
the average energy of molecules in motion
temperature
density
the ratio of mass per volume .... mass/volume
