Ch4-6 former exam Qs

please highlight the correct answer

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.

Write dimly, brightly, not at all to the intensity and classify what kind the chemical is depending on its electrical conductivity

Why do you need to study chemistry? How is it applicable to your course which is Criminology? In ten (10) sentences.

Sam drops a sugar cube into a jar with hot water and a sugar cube into a jar with cold water. Both jars have the same volume of water. He drops the sugar cubes at the same time and then observes how much of them dissolves in two minutes. What will be the result of Sam’s experiment, and which statement should he use as his conclusion? A A greater amount of sugar dissolved in hot water because temperature is directly proportional to the solubility rate of sugar in water.   B Temperature does not affect the solubility rate of the sugar cube in water because sugar dissolves equally in both cold and hot water.   C A greater amount of sugar dissolved in hot water because temperature is inversely proportional to the solubility rate of sugar in water.   D A smaller amount of sugar dissolved in cold water because temperature is inversely proportional to the solubility rate of sugar in water.

Please don't provide handwriting solution

Name the following Fe(NO3)2

Chlor-alkali plants electrolyze NaCl to produce the commodity chemicals caustic soda and chlorine gas.  Industrial waste effluent released into waterways from these plants can contain trace amounts of mercury.     Legally, the effluent can contain up to 2.50 x 10-9 mol/L of mercury.  Determine the minimum volume of water, in megalitres (ML), that must be added to a 1.14 g sample of mercury to dilute the effluent to acceptable levels.   Record only your numerical answer with the correct number of significant digits.  You do not need to include units as the units appear for you beside the answer box already.

Chlor-alkali plants electrolyze NaCl to produce the commodity chemicals caustic soda and chlorine gas.  Industrial waste effluent released into waterways from these plants can contain trace amounts of mercury.  Legally, the effluent can contain up to 2.50 x 10-9  mol/L  of mercury.  Determine the minimum volume of water, in megalitres (ML), that must be added to a 1.13 g sample of mercury to dilute the effluent to acceptable levels.(Do not show your work in the space provided; record only your final answer with the correct number of significant digits and the proper units.)

If 2.0 × 10-4 moles of  H2O2H2O2 in 50 mL solution is consumed in 3 minutes and   25  seconds, what is the rate of consumption of H2O2H2O2?  Express the rate in mol per liter·second to two significant digits.

I'm resending this question because the image on the last one was blurry. I wrote the prompt and steps and helpful conversions to figuring out the real world problem on my scratch paper, how do I solve for this problem?

1a. Throughout the experiment, what are some possible sources of error that could have led to someone recovering a significantly smaller amount of table salt (NaCI) than was originally present in the sample mixture. 16. What are some possible sources of error that could have led to someone to appear to have recovered a significantly larger amount of sand (SiO2) than was originally present in the sample mixture.

acid A student prepares a 1.2 M aqueous solution of benzoic acid (CH,CO,H). Calculate the fraction of benzoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.

purses/58591/days/1492616/assessments/623504/variants/623504/take/25/ Question 24 Which is the best description of the regulation goals set forth by the Kyoto protocol of 1997? A a suggestion to car manufacturers to develop less-polluting vehicles a mandate for industries to use air pollution control devices, such as scrubbers and electrostatic precipitators a goal set to decrease the carbon dioxide (CO2) emissions from anthropogenic activity, with a focus on stopping the rise of global temperature a goal and promise to make efforts to reduce greenhouse gas emissions

A student prepares a 1.0M aqueous solution of 4-chlorobutanoic acid (C₂H CICO₂H). Calculate the fraction of 4-chlorobutanoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits. % x10 X

What is calibration and why is it essential in relation to food analysis? Provide examples.

Mercury emitted by industrial activities bioaccumulates in saltwater Tima as methylmer cury. The concentration of methylmercury in canned albacore tuna averages 30 x 10 g / 85 g of tuna. Determine the number of times per year when an individual (both male and female) can safely consume 110 g of canned albacore tuna. The reference dose is RD-1x10 mg/(kg-day).

it's homework not exam

In an alternate reality, the following salinity vs. density information was collected and summarized below. Based on this data, calculate the salinity of a solution that has a density of 1.017 g/mL. Enter your answer with at least 3 significant figures.  Salinity (g/mL) Density (g/mL) 0.00 0.983 20.00 0.998 50.00 1.020 100.00 1.057 150.00 1.095

Subparts 4-6

Final Burette Reading Initial Burette Reading Mass of flask + water (after adding aliquot) Mass of flask (before adding aliquot) Approx. 10 mL Aliquot 10.93 mL 0.84 mL 105.49 g 95.63 g Approx. 15 mL Aliquot 25.91 mL 10.93 mL 120. 28 g 105.49 g What is the density of the approx. 10 mL aliquot, in g/mL? Report your answer to the correct number of significant figures and only report the numerical value (no units).

Salt(NaCl) can result in corrosion problems on cars and bridges in areas where it is used to de ice roads. Use a reference source to find out what other chemicals are now sometimes used instead, with their advantages and disadvantages.

I just need help with line A7 across.

TRUE OR FALSE __________ 6. Glassware is clean when no water droplets cling to the inner wall of the vessel. __________ 7. When smelling the odor of a chemical substance, fan your hand over the substance toward your nose which should be centimeters away from the substance. __________ 8. An accident as simple as breaking a beaker containing distilled water in the sink does not need to be reported to the laboratory instructor. __________ 9. Students should turn off cell phones, iPads, and other electronic devices during the laboratory class. __________ 10. It is a good laboratory protocol to call other students’ attention when they do not practice good laboratory safety procedures.