1. Watch the video and answer the following questions.
(1) Safety gear includes ?
A. googles, a pair of latex gloves, a lab coat
B. goggles, a pair of latex gloves, a lab coat
C. goggles, a pair of leather gloves, a lab coat
D. googles, a pair of leather gloves, a lab coat
(2). Electronic balance used for measuring mass of a substance or chemical, usually consists of a pan on which you can place the substance you want to measure. This generates current proportional to the displacement of the pan due to the pull of gravity which then translates into the displayed reading.
(3) ? used as support to clamp laboratory glassware and other equipment in place so it does not fall down or come apart. ? used with a ring stand to hold glassware such as a beaker or a funnel.
A. Ring stand, ring clamp
B. Ring clamp, ring stand
C. Ring stand, ring holder
D. Ring holder, ring stand
(4) Wire gauze may have a fiber glass or ceramic center, used to support a container such as a beaker on a ring stand while it is being heated.
(5) Bunsen burner. Be careful not to put ? materials like a cloth or chemicals like aromatic compounds such as petrol anywhere near it or this may erupt a fire.
A. Hot
B. Toxic
C. Flammable
D. Fibre
(6) Beaker. A beaker is a glass apparatus, used to hold mix and heat liquids.
(7) Crucible, a ceramic pot used for holding chemicals during ? at very high temperatures.
A. Cooling
B. Defrosting
C. Heating
D. Freezing
(8) Clay triangle, a metallic triangle, used to support a crucible during heating.
(9) Crucible tongs, used to hold crucibles.
(10) Evaporating dish, a wide ceramic dish, used to heat liquids for evaporation.
(11) Utility clamp, a metallic clamp used to secure glassware to a ring stand.
(12) Volumetric pipette, this comprises of a graduated glass tube, that is used to measure an exact volume of liquid. (13) Wash bottle, used to rinse pieces of glassware and to add small quantities of water.
2.Match the following equipment and its description to the correct picture.
Test tube
Volumetric flask
Graduated cylinder
Erlenmeyer flask
Burette
3. Match the following equipment to the correct description.
Pipette bulb
Forceps
Mortar and pestle
Scoopula
Stirring rod
Funnel
A. ? used to transfer solids looks similar to a spoon.
B. ? used to crush and grind materials you may have seen something similar in your kitchen.
C. ? a round rubber bulb used to draw liquids into a pipette.
D. ? it is used to transfer liquids or fine-grained materials into containers with small openings, also used for filtration.
E. ? used to pick up or hold small objects.
F. ? used for stirring and mixing and is usually made of glass.
ANSWER SHEET
- B
- A
- C
- C
- DCAFBE
- BAEBC
Volumetric flask. A volumetric flask is a round flask with a long neck and a flat bottom. It is used to prepare solutions to an accurate volume. There is a small line on the neck that indicates how far to fill the bottle. They come with special caps to prevent contamination and leaks.
Test tube, a glass tube with a round base used to hold and mix liquids, need a steel, rack or a clamp to hold it.
Buret, a long glass graduated tube with a tap around it. A buret is used for dispensing an accurate volume of a liquid and measuring its discharge.
Conical flask also known as the erlenmeyer flask is a glassware that has a narrow neck that expands towards its base it is used to hold and mix chemicals. The small neck is to facilitate mixing without spilling.
Graduated cylinder, used to measure a precise volume of a liquid.
