LAB 1: Laboratory Tools and Uses

Question 1

used to make accurate measurements of liquid volumes

Answer 1

graduated cylinder

Question 2

to measure the exact temperature of substances

Answer 2

laboratory thermometer

Question 3

to measure mass very precisely

Answer 3

triple beam balance

Question 4

used as a clamp to grab test tubes

Answer 4

test tube holder

Question 5

rectangular wire mesh with asbestos at its center, used to prevent the cracking of glass apparatus during heating

Answer 5

wire gauze

Question 6

wire gauze also helps in _____ of heat

Answer 6

uniform distribution

Question 7

for heating, sterilization, and combustion in a laboratory

Answer 7

alcohol lamp

Question 8

alcohol lamp uses _____ as fuel

Answer 8

ethyl alcohol or denatured alcohol

Question 9

tips for taking care of laboratory tools

Answer 9

• 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

Question 10

different glassware and equipment used in different activities/experiments in the laboratory

Answer 10

laboratory tools

Question 11

mostly are made up of glass which used for measuring volume, temperature, and density

Answer 11

measuring tools

Question 12

some measuring tools:

Answer 12

• burette
• thermometer
• pipette
• graduated cylinder
• balances

Question 13

primary measuring tool for the volume of a liquid;

there are several markings up and down the length of the container with specific increments

Answer 13

graduated cylinder

Question 14

how to read the volume from a graduated cylinder

Answer 14

• 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

Question 15

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

Answer 15

burette

Question 16

located right above the bottom opening of the pipette that can be turned to control the amount of liquid being released

Answer 16

stopcock

Question 17

a burette is _____ when the stopcock is parallel to the tube

Answer 17

open

Question 18

a burette is ______ when the stopcock is perpendicular to the tube

Answer 18

closed

Question 19

used for measuring temperature of liquids

Answer 19

thermometer

Question 20

used to weigh chemicals

Answer 20

balance

Question 21

how to use a triple beam balance

Answer 21

• 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

Question 22

to extract, transport, and dispense liquid samples

Answer 22

pipettes

Question 23

how to use a pipette

Answer 23

• 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