Which activities are likely to cause contamination of stock chemicals in the laboratory? pouring out chemicals from the stock container into another container returning unused stock chemicals to their original container at the end of an experiment swirling the container of stock chemicals to ensure that the contents are thoroughly mixed spilling some of the chemicals on the lab bench and then returning them to the original container inserting a dirty pipet into a container of stock chemicals
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- Which of the following methods is used to determine "dissolved metals" in a water sample? O Digest the water sample and measure the metals in the digest Filter the water sample and measure the metals in the filtrate Filter the water sample and measure the metals in the particles in the filter Digest the water sample, filter the digest, then measure the metals in the filtrateIs it acceptable to recycle the containers of hazardous chemicals? Why or why not? Explain your answer within the context of chemical safety.Dissolution Distilled H20 Concentration 0.01 M HCI Concentration (mg/ml) Time Total amount A Total amount A (mg/ml) (mg) (mg) 5 0.16 0.1 10 0.24 0.18 15 0.35 0.25 20 0.48 0.34 25 0.58 0.4 30 0.67 0.5 1. Plot the given data on an ordinary paper and find the slope for each line then calculate the IDR constant for aspirin in the two dissolution media, water and HCI. NOTE: Slope of the calibration curve = 1.0 (mg/ml and saturation solubility of salicylic acid is equal to 2.0 gm/L.
- Which of the following given statements is false? 1. The electrical conductivity of water is dependent on the temperature of the water sample. Removal of suspended particles by sedimentation depends upon the size and specific gravity of those particles. Suspended solids retained on a filter may remain in suspension if their specific gravity is similar to water while very dense particles passing through the filter may settle. Sodium hydroxide and sodium chloride are both bases. 2. In a sedimentation process, the solid particles settled at the bottom of the container because they are heavier than water and are acted upon by gravity. In the process of distillation, the condenser helps in the conversion of the vapor that goes inside it into liquid. After filtering a mixture using a filter paper, there is more solute at the bottom of the container compared to the contents of the filter paper. In the reaction between dry ferrous sulfate and dry potassium ferricyanide, no change is observed.…What is the purpose of Safety Data Sheets? Why are these important when handling common food service chemicals? What information/components are generally included? How do Safety Data Sheets vary?An impure sample contains 1.01 g of impurities and 4.92 g of benzoic acid. The impure sample is dissolved in water, then heated. The solution is then cooled. How many grams of benzoic acid will recrystallize when the solution has cooled? Include the unit and two decimal places in your answer. The solubilities of the impurity and benzoic acid in hot water are found as an item in the Recrystallization Experiment folder. Solubility Data for Report Questions 10 Compound Cold Water solubility Hot Water Solubility Benzoic acid 0.42 g per 100 mL of water 5.79 g per 100 mL of water Impurity 0.61 g per 100 mL of water 4.62 g per 100 mL of water
- 3. Corev was synthesizing a chemical in the laboratory. He used different purification techniques to try to obtain a pure compound. The melting point of the pure compound is 65 degrees. When he tested his compound in the lab the melting point he obtained was 62-68 degrees. Is the product he synthesized pure? 4A company was low on copper metal and decided to use some chemical additives just this once to some copper wiring they were installing in a house. How will this impact the conductivity of the wiring?In a few lines, describe the IMMENENT IMPORTANCE of “Green Chemistry" and its importance to Society.A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table. Solid Sample Melting Point (oC) Time Elapsed (min) Table Sugar (sucrose) 186 18 Table Salt (sodium chloride) 500 (not observed) 30 Paraffin Wax 37 4 Vegetable Lard 50 >5 Using the information contained in the table, what is the BEST explanation for the results?A The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…
- A solution is contaminated with traces of cadmium, manganese, and cobalt. Which option would be the safest way to make it safer for human consumption? ksp OH- CO32- S2- Cd2+ 2.5x10-14 1.8x10-14 8x10-28 Mn2+ 1.6x10-13 5.0x10-10 2x10-53 Co2+ 1.3x10-15 1.0x10-10 5x10-22 A bubble carbon dioxide into the water B raise the pH to about 12 C lower the pH to about 2 D increase the sulfide levelWhen you are dispensing stock solution into your graduated cylinder, you find that you have poured out too much solution. What is the best thing to do with the excess solution? O use the whole amount in the experiment om O pour into the waste container O pour back into the stock bottle O pour down the sink drain aConcentration (mg/ml) Time (min) 8.5 0.5 6.8 5.4 1.5 4.0 2 3.2 2.5 2.5 3 What will be the slope of the line using the given first and second values? What will be the y-intercept, still using the given first and second values? Completely state the equation of the line. nlcot olN5