Lab Equipment and Measurements Graduated Cylinder Measures volume

Lab Equipment and Measurements

Graduated Cylinder Measures volume of liquids n Unit: liter (L) n Commonly use m. L in lab n Proper Procedure: Place cylinder on a flat surface, get at eye level with the liquid, and read the bottom of the miniscus, the curved part of the top of the liquid. n

Correct Technique!

Meniscus

Practice

Beaker Can be used to measure large volumes, but not as accurate as a graduated cylinder n Mainly used for pouring and mixing n Unit: m. L n

Triple-Beam Balance Measures mass (amount of substance – how much) n Unit: gram (g) n Procedure: Place balance on a flat surface, adjust masses until the arm balances. Take the sum of the 3 masses. n

Practice!

More Practice!

Spring Scale Measures weight (the force of the pull of gravity on a substance) n Unit: Newton (N) n

Look more familiar?

Meterstick or Ruler Measures distance or length n Unit: meter (m), or cm (centimeter) in the lab n

Practice!

Thermometer Measures temperature n Unit: Kelvin (K) or °Celcius (°C) n What do you think would be the “proper procedure” for reading a thermometer? n

Stopwatch or Timer n Measures: time n Unit: seconds (s)

Other Equipment n n Test tube Funnel Bunsen burner Test tube clamp

Other Equipment (cont. ) n n Ring stand Erlenmeyer flask

Dissection Equipment Forceps n Teasing needle n Probe and seeker n Scalpel n

IMPORTANT Prefixes Foldable Kathy Has Dirty Underwear, Don’t Check Mine! n kilo = 1000 n hecto = 100 n deca = 10 n Basic unit n deci = 1/10 = 0. 1 n centi = 1/100 = 0. 01 n milli = 1/1000 = 0. 001 n