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.The LD50 of ethlyl alcohol (ethanol) is 5 g/kg a.) How many grams of ethanol would constitute a lethal dose for an adult weighing 164pounds?

Dr. X claims that she has found a new remedy (carrot extract) to cure acne. She scores an interview with the science writer for a local newspaper, and gets a brief article written about her and her claims in that newspaper. The article does not contain any experimental evidence, but mentions that Dr. X accidentally splashed some carrot extract on her face and found that the acne was reduced a few days later. Student Y finds the article and cites it as a source for a paper he is writing for class, as evidence that acne has been cured. (a) Is this finding a fact, a theory, a hypothesis, or an observation? Explain why you think so. (b) Was it OK for Student Y to use the newspaper article as evidence for his paper? Explain why or why not.

Which of the following would be used to sterilize a mattress?   ethylene oxide heavy metals autoclaving formaldehyde non-ionizing radiation

Strontium phosphate, Sr3(PO4)2Sr3​(PO4​)2​, dissociates when placed in water. This compound has a solubility of 0.112 mg/L in water at 20 °C.   Calculate the Ksp of Sr3(PO4)2Sr3​(PO4​)2​. Please write your answer using scientific notation according to the following format: 0.0010 would be writen as 1.0*10^-3.

a) Lysine is an essential amino acid. It is taken by some people as a nutritional supplement in the form of a hydrated crystalline solid with the formula C6H₁4N2O2.XH₂O . To control the dose of lysine, it is essential to know the complete formula of the hydrate, which means determining the value of x. To determine the value of x in lysine hydrate, a pharmacist used a direct titration method. She dissolved 6.258g of the compound in approximately 100mL of distilled water and then made this up to 250mL in a volumetric flask. She then titrated 25mL aliquots of this solution with a standardized NaOH solution of concentration 0.1050 mol dm-³, obtaining a mean titre of 36.30 mL. In titrations, lysine behaves as a monoprotic acid. Use these data to determine the value of x in lysine hydrate. b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the lysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g. Use this…

lonization radiation usually affects molecules in human cells like: glucose water DNA lipids

3.25 mL of Biomarker A (4.21 x 10-7 mol L-1) was brought up to volume with deionized water in a 50 mL volumetric flask. What is the final concentration after this dilution (in mol/ L)

Concentrated sulphuric acid is used in this experiment to O help the crystal growth of acetylsalicylic acid speed up the reaction of aspirin synthesis increase the activation energy O avoid impurities getting trapped into the aspirin crystals P Type here to search

A phlebotomist gets a needlestick from a patient with known hepatitis B viral infection. The best immunoassay test to detect newly acquired disease in the phlebotomist is to measure the hepatitis B surface antigen within the first 3 months of the encounter.   Question 3 options:   True   False

A drug has a half life of 12 hours. How much of the drug will remain in the patient 36 hours after administration. 50% 75% 25% 6.25% 12.5%

Can you identify the acceptable exposure limits for affected populations in occupational and nonoccupational environments?

The 14C/12C ratio in papyrus currently growing near the Nile River is 1.8 times greater than that found in a scroll found near the Great Pyramid at Giza. How old is the scroll? t1/2(14C) = 5730 years.

Scientists study the impact of changing only one component of a cancer treatment in a laboratory. Which of the following describes the study? controlled experiment observational study conceptual model computational study