Chapter 3-4 Test
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What is quantitative measurement?
a numerical measurement
What is qualitative measurement?
a non-numerical representation of something
What is accuracy?
Refers to how close a measurement is to the true or correct value for the quantity.
What is precision?
Refers to how close a set of measurements is to producing reproducible or consistent results.
How do you determine when accuracy’s range stops?
Percent Error
What does Percent Error allow us to do?
Allows us to numerically compare our experimental results to the accepted value of a quantity.
What is the formula for Percent Error?
|Experimental value-Accepted value| / Accepted value all x 100
What is proper scientific notation?
A number written as the product of two numbers, a coefficient multiplied by 10 raised to a power
What are the coefficient rules for scientific notation?
must be greater than or equal to 1.0, less than or equal to 10.0.
Put this number in scientific notation: 2560000
2.56 x 10^6
How do you multiply scientific notation numbers?
Multiply coefficients and add exponents
How do you divide scientific notation numbers?
Divide coefficients and subtract exponents
How do you add or subtract scientific notation numbers?
Coefficients can only be added when their exponents are the same. The exponents aren’t added or subtracted–they remain the same.
What does SI stand for?
International System of Units
What are the SI units for mass, volume, length
cubic meters, meters, kilograms,
What are the SI units for density, temperature, time, pressure?
kg/cubic meters, Kelvin, seconds, pascal
What are the SI units for energy, electric current, amount of substance, and luminous intensity?
Joule, Ampere, Mole, Candela
What is the mass-volume relationship?
1g of water at 4 degrees Celsius has a volume of 1 mL or 1 cm^3. A liter of water has a mass of 1000 g or 1kg.
What are common units of density?
g/cm3, g/mL,
What is time?
An interval between two occurrences.
What is temperature?
A measure of the average kinetic energy of the particles in a substance.
What is Kelvin?
Also called the absolute scale, 0 Kelvin is called absolute zero, There are no negative temperatures in the Kelvin scale, at 0 K, the lowest possible temperature, in which all molecular motion stops.
How do you convert Celsius to Fahrenheit?
F=9/5(C) + 32
How do you convert between Kelvin and Celsius?
C=K+273