Does the vehicle have zero energy at the bottom of the track? No, because there is motion.
What was the first step of using the balance before adding?
First, before weighing anything on this analytical balance, it needs to be “tared,” or recalibrated to read 0.0000 g.
Why is it important to work in the fume hood during the step?
Fume hoods, or fume cupboards, work to ensure the safety of lab personnel while working with hazardous materials by continuously delivering airflow away from the user. When used properly, fume hoods can prevent users and the environment from toxic gases, explosions, and spills.
How should you dispose of the remaining methanol solution?
Large quantities of waste methanol can either be disposed of at a licensed waste solvent company or reclaimed by filtration and distillation. Waste methanol, or water contaminated with methanol, must never be discharged directly into sewers or surface waters.
What was transferred from the hydrochloric acid to the water molecule?
According to this theory, an H+ ion is transferred from an HCl molecule to a water molecule when HCl dissociates in water. HCl acts as an H+-ion donor in this reaction, and H2O acts as an H+ ion-acceptor.
What should we do to reduce the risk when working with concentrated acids and bases quizlet?
What should we do to reduce the risk when working with concentrated acids and bases? Dilute them. Because diluting an acidic solution will decrease the concentration of H+(aq) ions. This causes the pH to increase towards 7.
Why did you need to zero the balance before you added the water to the beaker?
(The balance should read zero with the beaker on the measuring pan so that the beaker’s mass does not need to be subtracted each time.) Measure exactly 10.0 mL of DI (deionized) water using the graduated cylinder.
Can you put your head in the fume hood?
The hood should not be operated unless it is verified that it is working correctly. Safety glasses (goggles), lab coats, and appropriate chemical gloves must be worn when working in, on, or around the fume hood. Do not put your head in the hood, beyond the sash opening.
What do fume hoods protect you from?
hazardous substances
Fume Hood Purpose and Importance
The purpose of a chemical fume hood is to prevent the release of hazardous substances into the general laboratory space by controlling and then exhausting hazardous and/or odorous chemicals.
What happens if you smell methanol?
Short-term exposure to methanol vapor can irritate the eyes, nose and throat and cause headache, nausea, throwing up, dizziness and trouble breathing.
What happens if you touch methanol?
Skin exposure and clinical symptoms
Chronic and repeated continuous contact with methanol can cause erythema, degreasing of the skin, squama, eczema, and dermatitis. For chronic absorption, metabolic acidosis can demonstrate the same symptoms described for acute ingestion [22].
Can you pour methanol down the sink?
waste methanol or a solution contaminated with methanol should not pour down the sink or discharged in to sewer. It is a hazardous material.
Is water technically an acid?
Acids have a pH less than 7, while bases have a pH higher than 7. Because it has a pH of 7, water is considered to be neutral. It is neither an acid nor a base but is the reference point for acids and bases.
Can water be an acid?
Pure water is neither acidic or basic; it is neutral. So how does something become acidic or basic? That happens when the hydroniums and the hydroxyls are out of balance. If there are more positively charged hydroniums than negatively charged hydroxyls, then the substance is acidic.
What do acids taste like?
acids have a sour taste, acids are corrosive, acids lose their acidity when they are combined with bases and. bases feel soapy.
What do you notice about the components that make up the essay unit for kinetic energy?
What do you notice about the components that make up the SI unit for kinetic energy? They are the same as potential energy.
What is the first thing you have to do if there is a fire in the lab?
should always pull the fire alarm and call 911 to evacuate the building and bring the fire department. ➢ Keep areas around all types of heating equipment clear of combustibles at all times. While working in a lab you notice that smoke is coming from a fume hood across the room.
What is the first thing you have to do if there is a fire in the lab Labster?
Evacuate through the emergency exits. These ensure that nobody can get trapped in case of a fire, and therefore should always be kept clear. Evacuation plans should be placed near the exits. Fire blankets can be used to protect yourself.
Why is it important to zero the balance before using it?
Weighing directly requires that the balance be carefully zeroed (reads zero with nothing on the balance pan) in order to obtain accurate results. A clean piece of weighing paper is placed on the balance and weighed. This is the first reading.
Why is it important to tare a balance?
Why the tare feature is important. Taring saves a lot of time and is used in every industry because so many things that need to be weighed are placed in a container or package. Even with raw materials that aren’t packaged yet, using a container to weigh things can help keep the scale clean.
Why should you never weigh a hot object?
3) Do not weigh hot or cold objects on the balance. Hot objects will give erroneously lower readings due to air buoyancy, while cold objects will give higher readings due to the condensation of water vapor.