Module 7 Worksheet

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%

Arsenic-74 is a radioisotope used for locating brain tumors.  If t1/2 of arsenic-74 is 18 days, how much of a 120 mg sample remains after 90. days?       3.8 mg     60. mg     12 mg     18 mg     5.0 mg

Suppose that sodium pentobarbitol is used to anesthetize a dog. The dog is anesthetized when its bloodstream contains at least 45 milligrams (mg) of sodium pentobarbitol per kilogram of the dog's body weight. Suppose also that sodium pentobarbitol is eliminated exponentially from the dog's bloodstream, with a half-life of 5 h. What single dose should be administered in order to anesthetize a 50-kg dog for 1 h?

Lisinopril is an ACE inhibitor derived from the venom of a Brazilian pit viper frequently used in the treatment of hypertension. Because of Lisinopril's relatively long half life of 12 hours, patients need to take a dose just once per day. A patient takes his first dose, 20 mg, at 6 pm on Saturday. a) How many hours does it take for the amount of Lisinopril in the patient's body to decrease to 16 mg? Round to two decimal places. b) How many milligrams remain in the patient's body right before he takes his next 20 mg at 6 pm on Sunday? Round to two decimal places

A patient was given a 200 mg intravenous drug with a half-life of 15 minutes at 08:00. At what time will 6.25 mg of the drug remain in the body?

2Na(s) +2H2O(l) → H2 (g) + 2Na+(aq) +2OH-(aq) Considering this equation, what evidence would you look for and what tests would you perform as evidence that the reaction taken place is the one predicted?

please answer all 3 questions

The half life of caffeine in the human body is 6 hours. There is approximately 260 mg of caffeine in a Grande Starbucks coffee. If you drank the coffee at 9am, what time would it be when there is only 65 mg of caffeine left in your body?

A 125 mg dose of a drug is given at 6:00 AM. If the drug has a half life of 4.4 hours in the human blood stream find the following. a) How much of the drug is in the blood stream at 8:00 AM? b) How much of the drug is in the bloodstream at 8:00 PM?

Which of the following statements is true regarding the picture below. 18 19 20 21

A certain drug has a half-life in the body of 3.0 h. What should the interval between doses be, if the concentration of drug in the body should not fall below 20.% of its initial concentration? Round your answer to 2 significant digits. h X 5

1

A certain chemotherapy drug C with a molar mass of 275. g/mol is administered intravenously, and has a half-life in the body of 40. min. The maximum safe concentration of C is 400. μM. Suppose a patient has a mass of 90.0 kg and a total blood volume of 4.50 L. Calculate the maximum rate at which the drug can be given to this patient. Be sure your answer has 2 significant digits. min

What is half-life? 3-10 sentences

In a functional assay, you find that your purified hCG sample has an activity of 20,000 mIU/ml (where mIU is milli international units). You make a standard curve and determine that the concentration of a 100-fold diluted aliquot of your hCG is 0.05 µg/ml. What is the activity in mIU/mg of your purified sample? 4 x 10^5 5 x 10^7 4 x 10^6 4 x 10^7

A certain drug has a half-life in the body of 2.5 h. Suppose a patient takes one 200. mg pill at 6:00PM and another identical pill 90 min later. Calculate the amount of drug left in his body at 9:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. mg x10 X

Which of the responses correctly represents the missing particle in the following reaction?5927Co + ________ → 6027Co a. 42 α b. 0 -1 e c. 10n d. 11H

The radioactive isotope 133-54 Xe is used in pulmonary respiratory studies to image the blood flow and the air reaching the lungs. The half-life of this isotope is 5 days.  Part 1: A hospital needs 0.100 g of 133-54 Xe  for a lung-imaging test. If it takes 10 daysdays to receive the shipment, what is the minimal amount mXe of xenon that the hospital should order? Part 2: How long a time (t) will it take for the 133-54 Xe to decay so that eventually its activity decreases by a factor of 1024? Express in terms of days.

Carbonic acid has how many equivalents based on its H+ atoms? (this time you can write the chemical formula by your own). Group of answer choices 1 2 4 3   Which among the choices between differences of nuclear and chemical reaction is not true?   Group of answer choices greater energy yielded for chemical reaction nuclear reaction either splits or fuses its nuclei while chemical reaction exchanges its electron new atom was formed in nuclear reaction while same atoms in chemical reaction were present greater energy yielded for nuclear reaction   If dispersed phase was solid and dispersed medium is a gas what type of colloid is that? Group of answer choices foam sol aerosol gel

Try Again Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations. A certain drug has a half-life in the body of 3.5 h. Suppose a patient takes one 300. mg pill at 7:00PM and another identical pill 45 min later. Calculate the amount of drug left in his body at 10:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. 559. mg x10 X

A Water Quality Standard will be developed for radioactive isotope “Iron-55” which has physical (radioactive) and biological half-lives of 2.7 and 1.6 years, respectively. Through toxicological studies scientists decided “spleen” as the critical organ and the critical accumulation of Iron-55 in spleen has been determined to be 0.5 gram. Assuming radioactive exposure is only due to drinking water consumption and average life expectancy is 75 years. a) What should be the Maximum Concentration Level (MCL) as mg/L for Iron-55 in drinking water.  b) How long does it take to eliminate 95% of this radioactive isotope from human spleen after the person gives up on drinking water contaminated with Iron-55?

A certain drug has a half - life in the body of 3.0h. Suppose a patient takes one 300mg pill at 7:00PM and another identical pill 90min later. Calculate the amount of drug left in his body at 11:00PM. Be sure your answer has a unit symbol, if necessary, and round It to 3 significant digits

Below is the therapeutic (effective) and lethal dose data for a new experimental cancer drug, compound X. What is the approximate ED50 value? lethal effective (therapeutic) dose curve dose curve 100 75 % subjects responding 50 25. 4 6. 8 10 12 mg of experimental drug, compound X 9 mg 3 mg 12 mg 6 mg 50%

A certain drug has a half-life in the body of 3.5h. Suppose a patient takes one 250.mg pill at 6:00 PM and another identical pill 90min later. Calculate the amount of drug left in his body at 8:00 PM.

Strontium-90 (Sr-90), a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 yr. If the amount of Sr-90 in a certain area is found to be eight times the "safe" level, find how much time must elapse before an "acceptable level" is reached.

Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland. If a patient drinks a sodium iodide (Nal) solution containing iodine-131 on a tuesday, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

If a patient takes a drug with a half-life of 20 hours in the body, after how much time will 1/16 of the drug remain in the patients system?

Sodium -24 has a half life of 15 hours how much sodium -24 will remain in an 18.0g sample after 60 hours

part 1: If exactly 1.00 μg of 226Ra was used to paint the glow-in-the-dark dial of a wristwatch made in 1914, how radioactive is the watch in 1971? Express your answer in becquerels (Bq). The half-life of 226Ra is 1.60 × 103 years. part 2: Express your answer from above in microcuries (μCi).