LAB 1: Laboratory Tools and Uses Flashcards
used to make accurate measurements of liquid volumes
graduated cylinder
to measure the exact temperature of substances
laboratory thermometer
to measure mass very precisely
triple beam balance
used as a clamp to grab test tubes
test tube holder
rectangular wire mesh with asbestos at its center, used to prevent the cracking of glass apparatus during heating
wire gauze
wire gauze also helps in _____ of heat
uniform distribution
for heating, sterilization, and combustion in a laboratory
alcohol lamp
alcohol lamp uses _____ as fuel
ethyl alcohol or denatured alcohol
tips for taking care of laboratory tools
- keep the lab organized and sterile
- equipment in the lab must be calibrated for the results to be accurate
- faulty equipment must be repaired without any delay
different glassware and equipment used in different activities/experiments in the laboratory
laboratory tools
mostly are made up of glass which used for measuring volume, temperature, and density
measuring tools
some measuring tools:
- burette
- thermometer
- pipette
- graduated cylinder
- balances
primary measuring tool for the volume of a liquid;
there are several markings up and down the length of the container with specific increments
graduated cylinder
how to read the volume from a graduated cylinder
- get down to eye level
- place the cylinder on a flat surface
- pour the liquid
- notice that there seems to have an indentation, called meniscus. in this case, read the lowest point of the meniscus at eye level to get the proper reading
glass tube that is open at the top and comes to a narrow pointed opening at the bottom;
used for extremely accurate addition of liquid
burette
located right above the bottom opening of the pipette that can be turned to control the amount of liquid being released
stopcock
a burette is _____ when the stopcock is parallel to the tube
open
a burette is ______ when the stopcock is perpendicular to the tube
closed
used for measuring temperature of liquids
thermometer
used to weigh chemicals
balance
how to use a triple beam balance
- make sure the scale is zeroed properly
- get down to eye level
- start with the heaviest beam and see if its too much, then bring it back to zero
- start with the next beam and slide until the scale falls to know that the mass being measured is at something-ish
- next to manipulate is the smallest beam by using a stick, and continue until the beam balances again to the zero mark
to extract, transport, and dispense liquid samples
pipettes
how to use a pipette
- inspect the pipette to make sure that the top end is not chipped
- acclimatize the pipette: rinse with the solution to be used
- use a rubber bulb to extract a solution from the beaker
