Finish each statement about laboratory safety so that it correctly states a safety rule.a. Study your lab assignmentb. Keep food, beverages, andc. Know where to find and how to use the
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Finish each statement about laboratory safety so that it correctly states a safety rule.
a. Study your lab assignment
b. Keep food, beverages, and
c. Know where to find and how to use the
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- 1. What pieces of apparatus or equipment are used for measuring: a. Temperature? b. Small amount of liquids? c. Large amount of liquids? d. Mass of a substance? 2. Suggest ways on how to store and handle properly the different glassware to avoid accidents in the laboratory. You can use illustrations to show your idea. 3. Why is the most of the containers of substances and those used for heating are made up of glass rather than metal? 4. Explain why the thermometer should not be shaken rigorously to lower the reading to zero before using it.You have new employees in your laboratory whom you should train on Safety in the laboratory. Discuss the safety rules that they need to know.List which piece of lab equipment would be most useful for each of the following tasks. 1. Hold 50 mL of boiling water. 2. Crush a chunk of chemical into a powder. 3. Heat a beaker of water when a gas line is not available to power any equipment. 4. Measure exactly 42.5 mL of water. 5. Scoop ammonium nitrate out of its container and onto weigh paper to be measured.
- Why are laboratory safety rules important?Chemistry Five modern United States pennies are measured three times each on a balance, and their measured masses are compared to the actual mass of a penny (2.5000 grams according to US Mint). a. When looking at the precision of the balance, which would be more ideal: one relative standard deviation value for fifteen measurements or five relative standard deviation values for the five pennies? 2. What is the relationship between solubility and density? Why is it important to consider the solubility of substances when determining their densities? 3. Why is it ideal to use only 10 mL or greater of a liquid when calculating for density? 4. Assume you have stacked 5 liquids on top of one another in a column. Each liquid (3 mL) has varying densities. What will happen to the densities of the liquids if the volume of each increased? 5. What does percent error indicate: quality of instrument (refer to the balance and penny example in Problem #1) or quality of penny? Why?In a gravimetric determination of lead content in brass, there is a constant loss by solubility of 1.55 mg of lead. A sample contains 7.86% by mass lead, and a 0.3514-g sample is used for the analytical determination using the gravimetric method. Calculate the % relative error. *Watch the units. **Provide your answer to two decimal places and without units. Avoid using scientific notation.
- What volume (in mL) of 0.0887 M MgF2 solution is needed to make 275.0 mL of 0.0224 M MgF2 solution? McVc=MdVd A.10.9 mL B.91.8 mL C.14.4 mL D.72.3 mL E.69.4 mLDuring the experiment, can the crucible and lid be touched with bare hands? No. If the crucible is still hot, a student can burn his or her hand. No. Dirt and oils on hands can add to the mass of the crucible. Yes. Gloves can be slippery, making it more dangerous to wear them in lab. Yes. They are easier to transport to the balance room and bare hands do not introduce error into the experiment.A solution containing 42% NaOH by mass has a density of 1.30 g/mL. What mass, in kilograms, of NaOH is in 6.00 L of this solution?a. 2.38 kgb. 3.67 kgc. 2.48 kgd. 5.40 kg
- 2. What’s the main purpose of the glass shields on an analytical balance? A. To calibrate the balance B. To stop the current C. To keep out pests D. To prevent finger prints from getting on the weigh panMs. Tan came to the laboratory for blood tests because her physician suspected renal disease. The tests ordered were serum BUN, creatinine, and electrolytes. The blood specimen was obtained and processed. When the laboratory scientist received the serum to perform the tests, he noticed that the serum had a reddish tinge. What factor/s could cause this to happen to a serum specimen? 2. Is the sample acceptable for use? Elaborate your answer 3. What are the advantages of using plasma compared to serum in chemical analyses?A patient is to receive an IV infusion of 1.6 Lof 0.90% NaCi solution. The flow rate is 30 drops per minute. If the drop factor is 10 drops per millliter, how many hours wil it take for this infusion to finish? A 43.2 hours B. 4.32 hours C 9 hours D. 24 hours
