Which safety precaution is recommended when a liquid is being heated in a test tube?
Which safety precaution is recommended when a liquid is being heated in a test tube? When holding the test tube, keep fingers closest to the open end of the tube. Direct the flame of the burner into the open end of the test tube.
What should a student do if the contents of a beaker spill?
What should a student do if the content inside a beaker spills ? If this happens clean with Water. How do you hold and move a flask if you are mixing chemicals? You transport them with a forcep.
Where should you put unused chemicals?
Do not put chemicals back into reagent bottles; returning an unused chemical to a container risks contamination. Extra material must be placed in the appropriate chemical waste container. Whenever possible, share excess material with a neighbor, but do not return it to the original container.
What should you not do if a person’s clothes suddenly catch fire?
Never wrap a person whose clothes are on fire in a fire blanket, as it can create a chimney effect and cause burns on the person’s body and face. Instead they should roll on the floor to try to put out the fire, or step under a safety shower, if there is one in close proximity.
What is the best way to transfer solid chemicals into a beaker?
Take a labeled beaker to the reagent shelf where the chemicals are kept. When you take the top off the reagent bottle, don’t lay it down (risks contamination). Many solid chemicals can be easily transferred by tipping the bottle and slowly rotating the bottle back and forth.
What is used to transfer solid chemicals in weighing?
Spatula: Description: Made of metal or porcelain. Uses: To transfer solid chemicals in weighing.
What is used to transfer solids?
If a solid is to be transferred into a vessel containing a narrow mouth (such as a round bottomed flask), a “powder funnel” or wide-mouth funnel can be used (Figure 1.15a). Alternatively, the solid can be nudged off a creased piece of paper in portions using a spatula (Figures 1.15 b+c).
What is used to mix a small amount of chemicals together?
Stirring rod – A skinny solid glass rod used in chemistry to mix chemicals and liquids. A stirring rod is typically about the length of a long straw and has rounded ends. Test tube – A test tube is a glass or plastic tube used for holding, mixing, and heating small quantities of liquid chemicals.
What is a Scoopula used for?
Scoopula is a brand name of a spatula-like scoop utensil used primarily in chemistry lab settings to transfer solids: to a weigh paper for weighing, to a cover slip to measure melting point, or a graduated cylinder, or to a watch glass from a flask or beaker through scraping.
What is a beaker tongs used for?
Beaker tongs are used to hold and move beakers containing hot liquids.
What is a Scoopula made of?
Scoopula is a spatula like scoop utensils that is used in a chemistry lab setting for the transfer of solids from a flask to a watch glass, beaker, to a cover measuring melting point or to a weigh paper for weighing. Most scoopula are made of a piece of metal and serve a similar function as a spatula.
How much is a Scoopula?
Available Discounts
| Cat No. – | NC-0829 |
|---|---|
| Price: | $1.95 |
| Qty: | * |
What is a triangular beaker called?
An Erlenmeyer flask, also known as a conical flask (British English) or a titration flask, is a type of laboratory flask which features a flat bottom, a conical body, and a cylindrical neck. It is named after the German chemist Emil Erlenmeyer (1825–1909), who created it in 1860.
Why is working at a fume hood often preferable to working at a lab bench?
Why should you avoid wearing baggy clothing in the lab? Why is working at a fume hood often preferable to working at a lab bench? The ventilation system pulls fumes and fires away from you and the lab. Which of the following can be prevented by washing your hands after working in the lab?
What is a Erlenmeyer flask used for?
Mixing
What are characteristics of an Erlenmeyer flask?
Erlenmeyer flasks are recognizable from their basic characteristics: flat bottom, conical body, and long, cylindrical neck. They are named for German chemist Emil Erlenmeyer.
Why use an Erlenmeyer flask instead of a beaker?
The Erlenmeyer flask offers a slight advantage in accuracy due to its tapered sides. The size of the beaker or flask should be chosen to allow for more liquid to be added during the titration process. This makes it simpler than subtracting once the titration is complete. There is a valve at the bottom of the burette.
What is the difference between a beaker and an Erlenmeyer flask?
Erlenmeyer flasks have a narrow neck over a conical base, while beakers are basically large open-mouthed glass jars with a lip and spout for pouring.
What are the similarities and differences between a beaker and a conical flask?
There are several differences between the two common laboratory containers called beakers and flasks. The main difference between beakers and flasks is their shapes. A beaker is a cylinder with a lip for pouring and no lid. Flasks are curved with no lip and have lids.
How accurate is a beaker?
According to Indigo Instruments, the accuracy of a beaker is about 10 percent. A graduated cylinder is accurate to 1 percent of its full scale.
When would you use a beaker?
The Beaker’s main function is stirring, mixing and heating liquids. A Beaker has a cylindrical shape with a flat bottom and most include a small spout for pouring. They are available in a variety of sizes, ranging from one milliliter up to several liters.
Why is beaker least accurate?
The volume marks on a beaker are only approximate values, and therefore only provide whole numbers. For example, a 100 mL beaker might only have marks for every 20 mL, so it would be tricky to gauge the exact volume of a liquid sample falling between the 60 mL and 80 mL marks.
Why beaker is called beaker?
Laboratory flask. In laboratory equipment, a beaker is generally a cylindrical container with a flat bottom. Most also have a small spout (or “beak”) to aid pouring, as shown in the picture. Beakers are available in a wide range of sizes, from one milliliter up to several liters.
Why is graduated cylinder better than beaker?
Why is a graduated cylinder more accurate than a beaker? A graduated cylinder is used routinely for measuring volume and is considered more accurate than a beaker because of the permanently-marked incremental graduations incorporated in the clear cylinder.