Dissolved Oxygen Lab Questions

EHS 429 MAIN EXAMINATION PAPER 2018 DECEMBER QUESTION ONE (25 marks and compulsory, i.e., must be answered) The table below shows the results of water quality analysis of a sample of raw water intended for potable water treatment. Using the data provided in the table as well as the chemical equations and equilibrium constants provided below, answer the following questions (5 marks for each question). i. ii. iii. iv. V. Check the water quality analysis results for consistency and suggest if the analysis results are acceptable. Calculate the bicarbonate and permanent hardness in mg/L of CaCO3 Draw the ion bar chart of the raw water in meq/L Calculate the lime (in mg/L as CaCO3) required to soften this water using excess lime treatment method. Calculate the soda ash required (in mg/L as CaCO3). Parameter Unit Concentration Molecular (mg/L) weight TDS mg/L 300 Ca mg/L 65 40.1 ++ Mg mg/L 20 24.3 Na+ mg/L 15 23 K* mg/L 5 39.1 HCO3 mg/L 200 61 SO4 mg/L 120 96.1 cr mg/L 25 35.5 EX H2CO3 pH…

AP® Free-Response Practice 1. A scientist observes a pond located adjacent to a golf course and observes a thick mat of algae covering approximately half of the surface. The banks of the pond allow rain and snowmelt to enter the pond from the golf course property and there are emergent plants such as cattails growing around the perimeter. The scientist decides to run sev- eral water-quality tests to gather data. The results appear in the table to the right. Dissolved oxygen 4 ml/L 6.4 PH Nitrate Phosphate Total chlorine 0.01 mU/L 0.01 mL/L 0 mL/L (a) Based on the data shown, design an experiment that tests the relationship of a factor directly related to the growth of the algae. (i) State a hypothesis that will test the possible cause of the algal bloom. (ii) Describe the procedure that will test the hypothesis. (iii) Identify the control in the experiment. (iv) Identify the dependent variable. (v) Discuss the expected results of this experiment. (b) There are many causes of cultural…

f. What is the temperature inside the laboratory refrigerator? 8- What is the temperature inside the laboratory freezer? h. Your choice: i. Your choice: Your choice: 3 Return the materials to the designated location. Thoroughly clean your glassware, and clean and disinfect your laboratory station. Check Your Understanding- 3.1 Describe the difference between estimating the volume of a fluid in a graduated cylinder made of glass compared with one made of plastic. 3.2 Why is taring a balance important? 3.3 Liquid nitrogen is nitrogen cold enough to exist in the liquid form. It has a boiling point of -320.4°F. Convert this value to degrees Celsius.

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Lab Report: Experiment 2 Testing for Starch 1. Formulate a hypothesis regarding the presence of starch in different samples being tested. 2. Based on your hypothesis, make predictions on the outcome of the iodine reaction for each solution. 3. Report the data for the solutions tested in the Table 2.3. Indicate in the table which unknown solution was used. Table 2.3. The iodine test data for solutions. Starch Present? Final Color lodine Solution (yes or no) 1-2 drops 0.5 mL glucose 1-2 drops 0.5 mL starch 1-2 drops 0.5 mL albumin 1-2 drops 0.5 mL distilled water 1-2 drops 0.5 mL unknown 4. Did the unknown solution contain reducing starch? Laboratory 2 Macromolecules

Scientific Method and Tools Pre-Lab Questions: 1. Briefly outline the experiment that will be conducted to demonstrate the scientific method. 2. What are the basic metric units for measurements of length, mass, and volume? 3. Express these two numbers in scientific notation: 580 and 0.00355 4. If you were very thirsty, which bottle of Fiji water would you choose, the 200 ml or 1.5 l? Introduction: The metric system is used by the international scientific community. Metric units and some common measuring devices used for those measurements will be reviewed in this lab. Some of these tools will be used to develop an understanding of the terminology, practice, and application of the scientific method by performing an experiment. A testable hypothesis and prediction will be formulated, tested, and data collected and analyzed. The analysis will include the appropriate presentation of data using a graph to illustrate your conclusions. Scientific Method: Sponge Animals In this experiment, you…

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Water Body Y DO sample (0) DO blank (0) DO sample (5) DO Blank (5) Titration volume (ml) 3.Calculate the concentration of BOD in a body of water Y ! 0,5 0,6 0,3 0,55

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3 or 4 or 5

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Can you please help me answer guide questions, especially number 4 Thank you.

LEARNING TASK 9: DIRECTIONS: Read carefully the sentences. Then identify the word being describe in each sentence. Write your answer on the blank provided before each number. 1. It is the amount of solute present in a given quantity of solvent. 2. It is the total amount spent for goods or services including money and time and labor. 3. It is the cost of raw ingredients. 4. It refers to the combined costs of raw material and labor incurred in producing goods 5. It is a material that allows molecules of one kind to pass through it but prevents the passage of other kinds of molecules. 6. It refers to the homogenous mixture of substances with variable composition. 7. It is a solution which has a uniform composition and property. 8. Is the normal range in the percentage of food cost. 9. It is a solution of salt and water wherein fish is soaked and cooked before finally smoking it. 10. It is the process of a solute dissolving in another solute.

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What is the CONCLUSION AND RECOMMENDATIONS based on the result?

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Answer number 5

QUESTION:- A scientist is doing research to understand how volatile hydrocarbons affect phytoplankton (algae) growth during oil spills. In the lab, he adds a constant amount of oil and different levels of a volatile hydrocarbon (0- 50 μg/ml) to  phytoplankton in salt water with nutrients, trace minerals and sodium carbonate buffer. The scientists uses a spectrometer to detect the level of algae in the tube. In this way he can see growth of algae. Independent factor: volatile hydrocarbons Dependent factor: Algae as detected by absorbance in a spectrometer What belongs in the control? Select one or more: Sodium carbonate buffer Volatile hydrocarbons Water Algae Salt Oil Trace minerals Nutrients.

Some Processes and Their Associated Environmental Problems1. The burning of garbage produces persistent pollutants.2. The cooling of steam in power plants produces thermal pollution.3. The combustion of fossil fuels releases NOx(g) and SO2(g) into the atmosphere.4. The release of sewage increases organic matter in water bodies.     pH test = ?   Measurment of dioxin levels = ?   BOD test = ?   Measurement of temperature = ?

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Please answer the questions for the chemisrty of life lab review.

WRITTEN WORK #1: FACT or BLUFF 1. Nitrogen is a nutrient necessary for growth of all living organisms. 2. About 71% of the Earth's surface is water-covered. 3. Earth is 71% water and 29\% land. 4. Sometimes, the word " nosphere^ prime prime is used instead of the word "air." 5. Non-consumptive water use includes water that can be reused. 6. A pH test measures the alkalinity or acidity of water. 7. E. coli is a fecal coliform bacterium that should be present in drinking water. life. 8. High level of oxygen in water can be harmful to aquatic organisms. 9. Warm water has a higher conductivity. 10. Good air quality is a requirement for preserving the exquisite balance of

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Name 5 unusual properties of water and simply explain their importance to the biological environment.

Question 6 What is the function of the flame in AAS? lonozation of sample Atomization of sample boiling of sample evaporation of sample

Questions to Answer: 1. What is a buffer solution? And what are its composition?

H20 Pure water Positive pressure Negative pressure H20 H20 H20 Solute A В

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ANSWER ONLY NUMBER 3 ALL ABOUT BIO CHEM

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WATER QUALITY LAB – Quality of Natural Waters – Physical and Chemical Factors Read the background information and answer the Pre-Lab question. BACKGROUND We depend on a clean water supply for drinking, cleaning and sanitation, recreation, manufacturing, and for many other purposes. Public health officials and environmental biologis have developed tests that help monitor the quality of natural waters and locate sources, and potential sources, of water pollution. In this laboratory activity, you will test water samples collected from local waterways and assess them on the basis of several of the characteristics that scientists use to rate the quality of a body of natural water. Temperature One of the most significant characteristics of a body of water is its temperature. Among other things, temperature affects the solubility of oxygen in water, the rate of photosynthesis of aquatic plants, the metabolic rate of aquatic organisms, and the susceptibility of aquatic species to toxins and…