Homework Answers
The LC50 as molar concentration is expressed as below
Add Answer to:
15. In toxicity testing, the LC50 is the concentration of a chemical that will kill 50%...
a) LC50 for a chemical is the lethal concentration for 50% of animals or humans. For...
a) LC50 for a chemical is the lethal concentration for 50% of animals or humans. For example, if water contains a chemical at the LC50 concentration, 50% of the fish population in the water would die. Environment Canada collects data on LC50 concentrations. A 95 % confidence interval for the true mean LC50 with a random sample of 61 is (15.8, 18.4). Suppose the chemical concentration is measured in a local lake and found to be 19. This means that...
A patient presents with acetaminophen toxicity with a plasma concentration of 200 ug/mL. Knowing that acetaminophen...
A patient presents with acetaminophen toxicity with a plasma concentration of 200 ug/mL. Knowing that acetaminophen has a Vd of around 50 L, what dose did this person take?
A chemical plant produces wastewater containing (C3H10 N203) at a concentration of 50 mg/L. a) Determine...
A chemical plant produces wastewater containing (C3H10 N203) at a concentration of 50 mg/L. a) Determine the COD, TOC, BOD, NBODand ThOD values. Assume that the BOD first-order rate constant is 0.23 per day (base e). b) What are two criteria to be considered for the selection of sample dilution factor for the standard BOD5 test? Calculate the dilution factor based on these criteria.
(15)10. Find the equilibrium pH value if pper ion (Cu2+) concentration in water is 10 mg/L....
(15)10. Find the equilibrium pH value if pper ion (Cu2+) concentration in water is 10 mg/L. The copper ion is dissol ved from Cu(OH)2
please solve 4 and 5 c) What is the molar concentration of potassium in this solution?...
please solve 4 and 5
c) What is the molar concentration of potassium in this solution? d) What is the concentration of total sulfur in this solution in my e) What is the concentration of reduced sulfur(ie, SC-11) in this solution in mg/L? 1) What is the theoretical TDS of this solution in mg/L?! 4. If 200 mg of HCl is added to water to achieve a final volume of 1.00 L, what is the final pH? 5. What amount...
Chemists and engineers must be able to predict the changes in chemical concentration in a reaction....
Chemists and engineers must be able to predict the changes in chemical concentration in a reaction. A model used for many single-reactant processes is Rate of change of concentration _kCn where C is the chemical concentration and k is the rate constant. The order of the reaction is the value of the exponent n. Solution methods for differential equations (which are discussed in Chapter 9) can show that the solution for a first-order reaction (n = 1) is and the...
1a.) From water sample, 10 mg/L HCO3- as CaCO3, 10 mg/L CO3- as CaCO3 and 50...
1a.) From water sample, 10 mg/L HCO3- as CaCO3, 10 mg/L CO3- as CaCO3 and 50 mg/L Ca+ as CaCO3 were measured. pH was near neutral. What is alkalinity? _____ mg/L as CaCO3 1b.) From water sample, 10 mg/L HCO3- as CaCO3, 10 mg/L CO3- as CaCO3 and 50 mg/L Ca+ as CaCO3 were measured. pH was near neutral. What is alkalinity? _____ mg/L as CaCO3 1c.) Calculate Ksp = _____ A2BO3 ->2A++ BO32- Molar concentration of A+ = Molar...
Virtual Lab # 3 Concentration Name: Section Number: Date of Submission: Instructions: Please launch the simulation...
Virtual Lab # 3 Concentration Name: Section Number: Date of Submission: Instructions: Please launch the simulation in the link below to help you answer the following questions. Link: https://phet.colorado.edu/sims/html/concentration/latest/concentration en.html Part 1: Concentration Calculations Using Molarity Formula - Procedure: For Trial 1: Fill up the tank to I L, choose Solute: Drink Mix(solid), drag purple concentration meter into the tank as shown: 2. Shake the shaker to add solute to the water until you have an approx. concentration- 2 mol/L....
Question #1 (from Mihelcic). Assume an adult female who weighs 50 kg drinks 2 L of...
Question #1 (from Mihelcic). Assume an adult female who weighs 50 kg drinks 2 L of water every day and the absorption factor for the chemical of concern is 75 percent. The concentration of the chemical in the drinking water is 55 ppb. Determine the dose in mg/kg-day. Question #2 (from Mihelcic). Determine if exposure by oral ingestion to the chemicals xylene, toluene, arsenic, and hexavalent chromium poses a noncarcinogenic health risk. The chemical-specific reference doses (mg/kg-day) obtained from IRIS...
74 Percent Concentration -The amount of solute dissolved in a fixed amount of solvent is called the concentration of th...
74 Percent Concentration -The amount of solute dissolved in a fixed amount of solvent is called the concentration of the solution. Concentrations are typically expressed as Mass al.) (% m/m) which is the mass of the solute (g) divided by the mass of the solution [solute+ solvent] (g)x 1000/0; or as Volume ol.) (% v/v ) which is the volume of the solute in a fixed volume of solution (1O0mL of solution) x 1000/0; or less commonly in the laboratory,...
A chemical plant produces wastewater containing (C3H10 N203) at a concentration of 50 mg/L. a) Determine the COD, TOC, BOD, NBODand ThOD values. Assume that the BOD first-order rate constant is 0.23 per day (base e). b) What are two criteria to be considered for the selection of sample dilution factor for the standard BOD5 test? Calculate the dilution factor based on these criteria.
(15)10. Find the equilibrium pH value if pper ion (Cu2+) concentration in water is 10 mg/L. The copper ion is dissol ved from Cu(OH)2
please solve 4 and 5
c) What is the molar concentration of potassium in this solution? d) What is the concentration of total sulfur in this solution in my e) What is the concentration of reduced sulfur(ie, SC-11) in this solution in mg/L? 1) What is the theoretical TDS of this solution in mg/L?! 4. If 200 mg of HCl is added to water to achieve a final volume of 1.00 L, what is the final pH? 5. What amount...
Chemists and engineers must be able to predict the changes in chemical concentration in a reaction. A model used for many single-reactant processes is Rate of change of concentration _kCn where C is the chemical concentration and k is the rate constant. The order of the reaction is the value of the exponent n. Solution methods for differential equations (which are discussed in Chapter 9) can show that the solution for a first-order reaction (n = 1) is and the...
Virtual Lab # 3 Concentration Name: Section Number: Date of Submission: Instructions: Please launch the simulation in the link below to help you answer the following questions. Link: https://phet.colorado.edu/sims/html/concentration/latest/concentration en.html Part 1: Concentration Calculations Using Molarity Formula - Procedure: For Trial 1: Fill up the tank to I L, choose Solute: Drink Mix(solid), drag purple concentration meter into the tank as shown: 2. Shake the shaker to add solute to the water until you have an approx. concentration- 2 mol/L....
74 Percent Concentration -The amount of solute dissolved in a fixed amount of solvent is called the concentration of the solution. Concentrations are typically expressed as Mass al.) (% m/m) which is the mass of the solute (g) divided by the mass of the solution [solute+ solvent] (g)x 1000/0; or as Volume ol.) (% v/v ) which is the volume of the solute in a fixed volume of solution (1O0mL of solution) x 1000/0; or less commonly in the laboratory,...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago