check-anisha

Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to

(a) 40.0 mL of 0.300 M NaOH(aq).

(b) 20.0 mL of 0.400 M NaOH(aq).

Calculate the pOH and the pH of a solution in which 30.0 mL of 0.200 M HCl is added to 75.0 mL of 0.400 M NaOH.

 Calculate the pOH and the pH of a solution in which 15.5 mL of 0.100 M HCl is added 
to 25.0 mL of 0.150 M NaOH.

Solve using variation of parameters:

2y" + y' - y = x + 1

Given the initial conditions y(0)=1 and y'(0)=0.

solve each differential equation by variation of parameters subject to the initial conditions y(0)=1, y'(0)=0

2y''+y'-y=x+1

Find y'' for

y = 8x⁴e^5x.

Solve y'' + 2y' + y = cos(x) + 3 subject the initial conditions y(0) = 0 and y'(0) = 1

Answer the following question:

1. imagine you’re speaking with a friend or family member that doesn’t have much of a background in science. You mentioned something about LD50, and they asked you “What’s LD50?”. Tell me how you would explain what LD50 is to them in very general terms or with a creative example that someone without a background in science could understand. You already know the definition of LD50 but that isn’t going to help you here – what you need to do is clearly communicate the key details that make up the LD50 definition in a way that your friend or family member will understand.

Question 3:

Scenario:

 You are the lead of a forensic toxicology team and calling all the shots. You have just been given a new case, where you must try and determine if John Doe, the person you are doing an autopsy on, was the victim of foul play – a suspected poisoning. John Doe arrived at the emergency room of a hospital one day ago alive but unconscious. The following samples were collected upon admission:

• Blood (A).
• Urine (B).
• Hair (C).

After being admitted for one day (24 hours), John Doe died with no cause of death reported. John Doe’s body arrives at your facility for autopsy along with the samples A, B, and C. You further collect the following samples:

• Liver (any part) (D).
• Stomach contents (E).
• Lungs (F).
• Vitreous humor (G).
• Hair (H).
• Blood (I).
• Urine (J).

1. You only have enough time/money to process and analyze 4 of the samples (A-J). Indicate which 4 samples you would select and explain why you chose those samples (each sample has a letter associated with it (A-J); use this letter when answering the question). In your explanation you should discuss why each sample individually was chosen and any benefits there might be from the samples complementing each other. Also include in your answer the key factor that must be considered with respect to all samples (ADME) and explain how you accommodated this with your sample choices.

2. Once you have chosen your samples, you will need to perform some form of chromatography on each one before you can start to analyze them for any poison. Indicate which method of chromatography you would choose for each sample. You can use more than one method of chromatography on a single sample or use the same method on all samples – as long as you explain how that method of chromatography works and why it’s appropriate for each sample. As part of your answer, discuss if each sample would need pre-treatment before being subjected to chromatography and what the pre-treatment would be. 

3. Now that you have prepared your samples you must visualize and quantify your results using mass spectrometry. Select an ionization method for each sample that you prepared in question 2 above, describe how it works, and why it is ideal for that specific sample.

4. Describe what you need to do in question 3 above to be able to quantify your sample. 

5. What if you were presenting your mass spectrometry results in court and had a peak at an m/z of 542.3 and you stated in your findings that this corresponds to unique fentanyl analogue, which killed John Doe. Describe what additional work you must do to support this conclusion, how it works, and why it can provide definitive proof that the compound is in fact the unique fentanyl analogue. 

As a scientist working in a government lab, you have been given full control over the production of a new compound. The compound was isolated from the Eastern cypress tree, a tree which grows throughout 75% of the world and reaches maturity in 2-3 years. It was found that only the needles contain the compound of interest (shown to the right).

Choose whether you would extract from the natural source or chemically synthesize the compound. Explain and justify three reasons that support the choice you made and one reason, that is different than anything you mentioned, why your choice might not be the best – detail required in all answers. (9 marks)

WHMIS questions:

1. Where can I find hazard information?

2. What are the hazard classifications and precautions I need to take?

3. How can I protect myself from the hazards?

4. What should I do if I am exposed to the hazard?

With respect to tandem mass spectrometry, answer the following questions In your own words:

1. What is it? (1 mark)
2. How does it work? (1 mark)
3. What can it tell you that mass spectrometry can't? (1 mark)

2. In your own words, define/explain what ionization and vapourization are with respect to mass spectrometry. (2 marks)

3.Name one of the ionization methods discussed and explain, in your own words, how it works and what's involved. (4 marks)

With respect to tandem mass spectrometry, answer the following questions In your own words:

1. What is it? (1 mark)
2. How does it work? (1 mark)
3. What can it tell you that mass spectrometry can't? (1 mark)

I need to create a final written report for the device that I have been working on such as “SPECIAL BLOOD PRESSURE MACHINE PRODUCT THAT IS A WIRELESS, REMOTE MONITORING DEVICE THAT CONNECTS TO A SMARTPHONE APP WITH ACCURATE MEASUREMENTS”. The final report should not exceed 15 pages including drawings and references. The report should be organized as a written version of the marketing pitch that generally includes the following :

• Cover slide

• Elevator statement

• The clinical need

• The solution

• The market

• Intellectual property (IP)

• R&D

• Regulatory strategy

• Clinical studies

• Reimbursement

• Business model

• Marketing and sales

• Financial information

• Exit scenarios

• The ask

• Management team

• Closing slide

• Appendix

and should include the information outlined in table 6.2.3 as I posted in the above picture of the table called “Development Timeline”.

Using the data safety sheets: 

msds (fishersci.ca)

15596026_MTR-NALT_EN.pdf (thermofisher.com)

Answer the following questions:

1. What is the product identifier (name)? Are there any other “trade” names for the product?

PCI SDS: 

Sulfuric Acid SDS:

2. What is the company that manufactured/distributed the product?

PCI SDS: 

Sulfuric Acid SDS: 

3. What ingredients make up the composition of the product?

PCI SDS:

Sulfuric Acid SDS:

4. What are the CAS registry numbers for the “products”?

PCI SDS:

Sulfuric Acid SDS:

5. What are the GHS Classifications associated with the product? (WHMIS symbols and categories)

PCI SDS:

Sulfuric Acid:

4) The brakes on your car can slow you at a rate of 5.2 m/s?. If you are going 137 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 90 km/h speed limit? (The answer reveals the futility of braking to keep your high speed from being detected with a radar or laser gun.)

Talk about the VSe2 compound in terms of its characteristics, its synthesis, and the chemical reactions it participates in?

Case (IV)
With the suspension point 30cm from the left edge of the meter stick, hang a 200g mass 10cm from the left edge of the stick. Calculate the mass you must hang at a point 40cm to the right of the pivot point such that the stick hangs level and write it on the sketch.

A poll of 1052 Americans showed that 47.4% of the respondents prefer to watch the news rather than read or listen to it. Use those results with a 0.10 significance level to test the claim that fewer than half of Americans prefer to watch the news rather than read or listen to it. Use the P-value method. Use the normal distribution as an approximation to the binomial distribution.

Let p denote the population proportion of all Americans who prefer to watch the news rather than read or listen to it. Identify the null and alternative hypotheses.

: p ____   ____

: p ____   ____

(Type integers or decimals. Do not round.)

Identify the test statistic.

z = ____

(Round to two decimal places as needed.)

Identify the P-value.

P-value = ____

(Round to three decimal places as needed.)

State the conclusion about the null hypothesis, as well as State the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim.

____ the null hypothesis. There ____ sufficient evidence to ____ the claim that fewer than half of Americans prefer to watch the news rather  than read or listen to it.

What role does cadmium metal (Cd) play in anuclear reactor?

A) Slows down the fissionneutrons (moderator)

B) Transfers heatfrom the reactor to the heat exchanger (primary coolant)

C) Controls chainreaction (control rods)

D) Transfers heat fromthe condenser to the environment (cooling tower)

E) Undergoesfission (fuel rods)

1. The half-life of ⁹⁰Sr is 29.1 y. If a sample initially contains 50.00 g of ⁹⁰Sr, how much ⁹⁰Sr remains after 58.2 y?

2. The current disintegration rate for carbon-14 is 14.0 Bq. A sample of wood discovered in an archaeological excavation is found to have a carbon-14 decay rate of 0.875 Bq. If the half-life of carbon-14 is 5,700 y, approximately how old is the wood sample?

3. What role does cadmium metal (Cd) play in a nuclear reactor?

a. Transfers heat from the reactor to the heat exchanger (primary coolant)

b. Undergoes fission (fuel rods)

c. Controls chain reaction (control rods)

d. Slows down the fission neutrons (moderator)

e. Transfers heat from the condenser to the environment (cooling tower)

4. The ³H isotope of hydrogen is called _______.

5. Which of the following statements is true about hydrogen fusion?

a. To perform fusion, extremely low pressures and temperatures are necessary.

b. The mechanism behind an atomic bomb is hydrogen fusion.

c. Hydrogen fusion is caused due to a nuclear chain reaction.

d. Hydrogen fusion takes place in the interiors of starts

e. During hydrogen fusion, a wide range of isotopes are produced

6. Which of the following daughter isotopes will be produced after the radioactive decay of actinum-227 by alpha particle emission?

a. Polonium-218

b. Radium-226

c. Thorium-226

d. Francium-223

e. Astatine-211

7. 1Gy = _____

a. 0.01 J/kg

b. 0.1 J/kg

c. 1,000 J/g

d. 1 J/kg

e. 100 J/g

fQuestion:

2.Fission is a nuclear process in which small nuclei are combined into larger nuclei, releasing energy.

True

False

3.Which of the following isotopes is used for irradiation of food?

Thorium-228

Plutonium-238

Cobalt-60

Uranium-233

Iodine-131

4.An isotope undergoes beta decay. The daughter nucleus will have

a lower atomic number than the parent nucleus

an atomic number twice as high as the parent nucleus

the same atomic number as the parent nucleus

a higher atomic number than the parent nucleus

5.

What role does cadmium metal (Cd) play in a nuclear reactor?

transfers heat from the condenser to the environment (cooling tower)

slows down the fission neutrons (moderator)

undergoes fission (fuel rods)

controls chain reaction (control rods)

transfers heat from the reactor to the heat exchanger (primary coolant)

6.Which type of radiation is best suited for external radiation therapy

gamma

beta

neutron

alpha

7.Which of the following daughter isotopes will be produced after the radioactive decay of actinum-227 by alpha particle emission?

Polonium-218

Astatine-211

Thorium-226

Francium-223

Radium-226

8.Complete the following equation:235/92U---------->4/2He +.............

a) 231/90 Th

b) 231/91Pa

c)235/93 Np

d)235/92 U

e)236/93 Np

9.Alpha particles are identical to

helium nuclei.

hydrogen atoms.

electrons.

helium atoms.

protons.

10.Which of the following is an advantage of nuclear power plants over coal-burning plants? Nuclear plants:

form numerous radioactive fission products.

use more fuel.

produce more thermal pollution than coal plants.

do not pollute the air with SO2, soot, and fly-ash.

11.

Which type of nuclear process requires an extremely high temperature (millions of degrees)?

alpha decay

beta decay

positron emission

fission reaction

fusion reaction

12.If a sample of nobelium has an activity of 32 Ci and if the half-life of nobelium is 102 s, then in how much time will its activity become 4 Ci?

120 s

205 s

405 s

287 s

306 s

13.Radioactive elements are used for:

medical treatment.

determining age of fossils and rocks.

all of the above

medical diagnosis.

generating electricity.

15.Protactinium-231 is produced as a daughter isotope after the radioactive decay of _____ by alpha particle emission.

neptinium-235

plutonium-238

uranium-232

Americium-241

curium-243

I greatly appreciate any help with these multiple choices;

1. What radiation has a charge of -1?

a. Alpha b. Beta c. Gamma d. Positron

2. What type of radiation is given off when the atomic number decrease by 2?

a. Alpha b. Beta c. Gamma d. Positron

3. What type of radiation is given off when the atomic number increase by 1?

a. Alpha b. Beta c. Gamma d. Positron

4. What type of radiation is given off when the atomic number does not change?

a. Alpha b. Beta c. Gamma d. Positron

₀

5. What is the name of the following type of radiation? -1 e

a. Alpha b. Beta c. Gamma d. Positron

6. What radiation has a charge of +2?

a. Alpha b. Beta c. Gamma d. Positron

7. What type of radiation particle is given off when a neutron becomes a proton?

a. Alpha b. Beta c. Gamma d. Positron

8. What type of radiation is just a high energy photon (energy packet)?

a. Alpha b. Beta c. Gamma d. Positron

9. What type of radiation consists of 2 protons and neutrons?

a. Alpha b. Beta c. Gamma d. Positron

10. What type of radiation has a mass of 4 atomic mass units?

a. Alpha b. Beta c. Gamma d. Positron

Match the decay process (numbers 1-6 below) with a characteristic which is specific to that process (letters a-f below)

a) Formation of two heavy fragments; dominating decay mode for heaviest nuclei

b) Antineutrino emission occur simultaneously with this process

c) This emission process leaves the mass number unchanged but the atomic number will be reduced by one

d) Predominant mode of decay for neutron deficient nuclei with atomic number greater than 80

e) Does not ionize gases in Geiger counter so are often not counted by these devices; can be detected through fluorescence

f) Emitted particles are very dangerous as they cause extensive ionization of matter

1. Alpha decay

2. Beta decay

3. Positron decay

4. Electron capture

5. Gamma emission

6. Spontaneous fission

The spent fuel elements from a fission reactor are much more intensely radioactive than the original fuel elements. (a) What does this tell you about the products of the fission process in relationship to the belt of stability, Figure 21.2? (b) Given that only two or three neutrons are released per fission event and knowing that the nucleus undergoing fission has a neutron-to-proton ratio characteristic of a heavy nucleus, what sorts of decay would you expect to be dominant among the fission products?

1. What does this tell you about the products of the fission

process in relationship to the belt of stability?

A .the products of fission must lie outside the belt of

stability

B. the products of fission must lie within the belt of

stability

2. Given that only two or three neutrons are released per

fission event and knowing that the nucleus undergoing fissionhas a

neutron-to-proton ratio characteristic of a heavy nucleus,what

sorts of decay would you expect to be dominant among thefission

products?

1. (1 point) What might be damaged by ionizing radiation? * paper soft tissue wood lead

2. (1 point) When an atom emits an beta particle, what is the change in the atomic number? * no change decrease by 1 decrease by 2 increase by 1 increase by 2

3. (1 point) What is the change in atomic mass caused by the emission of gamma radiation? * no change decrease by 1 decrease by 2 increase by 1 increase by 2

4. (1 point) Which of the following materials would effectively stop gamma radiation? * one foot of concrete single sheet of paper thin pieces of wood three inches of lead

5. (1 point) When the ratio of neutron-to-proton dictates that a neutron must break down it will form _________. * A helium nucleus An alpha particle A proton and an electron Two protons

6. (1 point) What determines the type of decay if a nucleus falls outside the band of stability? * the ratio of alpha particles to beta particles the ratio of beta particles to alpha particles the ratio of neutrons to protons the ratio of protons to neutrons

7. (1 point) A positron is emitted when ____________. * an alpha particle forms a beta particle forms proton converts to a neutron neutron converts to a proton

8. (1 point) How does an atom with too few neutrons relative to protons undergo radioactive decay? * by converting proton to a neutron by converting a neutron to a proton by emitting an alpha particle by emitting a beta particle

9. (1 point) How much of the original sample would remain after two half lives have past? * There would be nothing of the original left There would be half of the original sample still there There would be one quarter of the sample still present There would only be one eighth of the original sample still present

10. (1 point) What is the approximate half life of carbon- 14? * hundreds of years thousands of years million of years billion of years

11. (1 point) A reaction where a heavier nucleus splits into smaller nuclei is called ___________. * a chemical reaction background radiation fission fusion

12. (1 point) __________ and ___________ are used as moderators to capture neutrons in a nuclear reactor. * Cadmium and other metal Carbon and water Liquid sodium and water Plutonium and neptunium

13. (1 point) For a person working in a place where they might be exposed to radiation a _________ is routinely used to check their exposure. * film badge Geiger counter moderating rod scintillation counter

14. (1 point) Radioisotopes are used to do all of the following except __________. * analyze matter. diagnose medical problems. improve the flavor of food. treat diseases. study plant growth. Open response questions: Answer the following with complete sentences or if math is involve show the work

15. (3 point) The radioisotope radon-222 has a half-life of 3.8 days. How much of a 198.6 g sample of radon -222 would be left after approximately 23 days? ( Show your work) * Your answer

16. (3 point) How can an element be artificially transmuted? Give an example that has an element and what it is transmuted into. * Your answer

17. (4 point) Why does the mass and charge of an alpha particle make it less penetrating than a beta or gamma? Discuss both the mass and the charge(2 points each). *

1. Which particles in the following tableresult in no change in nuclear charge when emitted in nucleardecay?
Table Particles Found in Nuclear Reactions (ONLY ONE correct):

Particle

a. Neutron

b.Proton

c. Electron

d. Alphaparticle

e. Betaparticle

f. Positron

2 .Given that only two or three neutrons arereleased per fission event and knowing that the nucleus undergoingfission has a neutron-to-proton ratio characteristic of a heavynucleus, what sorts of decay would you expect to be dominant amongthe fission products?

a. alpha emission

b. positron emission

c. beta decay

1. Ionizing radiation is called ionizing because it is sufficiently energetic to remove an electron from what molecule in the human body?

- Oxygen

- Hemoglobin

- Water

- Glucose

2.When a radioactive isotope undergoes beta decay, an electron is emitted from the nucleus. (That's weird isn't it?). One helpful model is to think of beta decay as the breakdown of a neutron into an electron and what other particle?

- Proton

- Quark

- Positron

- Neutrino

3.If an isotope of polonium (Po) loses 2 protons, the product will be an isotope of

- Polonium (Po)

- Lead (Pb)

- Mercury (Hg)

- Radon (Rn)

4.The largest source of background radiation is

- very small rocks

- radon

- food and water

- oak tress

When the nuetron to proton ratio in a raditoactive isotope is higher than that required for stability, it main gain greater stability by emitting

1. neutron radiation

2. positron radiation

3. beta radiation

Emission of the following particle(s) has (have) a very small effect on the mass of an atom.

1. beta particle

2. neutron

3. alpha particle

A nucleus with an excess of neutrons would be expected to undergo nuclear decay by the emission of a

A. deutron B. neutron C. neutrino D. beta particle E. gamma ray

The ionization energy of an atom compared to the binding energy of its nucleus is

A. much greater B. slightly greater C. the same D. slightly smaller E. much smaller

For each of the next three questions, select from the list below the choice that most completely describes emitted particle(s) in each type of radioactive decay. If more than one particle is possible, select the choice that includes both possibilities.

A a positron

B a high energy photon

C either a proton or a neutron

D either an electron or a positron

E a neutron

F an electron

G a proton

H a 4He nucleus

I either an electron or a proton

J either an electron or a neutron

The emitted particle in gamma radiation is: ?

The emitted particle in beta radiation is: ?

The emitted particle in alpha radiation is: ?

1.Which type of radioactive emission is analogous to an electron being emitted?

positron, neutrons, alpha particle, gamma rays, beta particle

2. Which isotope is naturally radioactive?

⁴₂H, ²₁H, ¹⁶₈O, ²³⁴₈₈Ra

3. the half life of protactinium-231 is 3.5x10⁴ years. How long will it take for 10.4 grams of Pa-231 to decay to 2.6 grams?

4. the half life of phorphorous-33 is 25.3 days. How long will it take for 64 grams of p-33 to decay to 1.0 grams?

5. the half life of sr-83 is 32.4 hours. how many emissions are produced when 20 g of strontium-83 decas to 4.0 grams?

Francium has an atomic number of 87. Which of the following is the nuclear equation that represents the radioactive decay of francium-223 by alpha particle?

Lawrencium has an atomic number of 103. _____is the daughter isotope formed when lawrencium-262 emits a beta particle.

s

How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?

If the half-life of tritium (hydrogen-3) is 12.3 y, how much of a 0.0666 g sample of tritium is present after 50.0 y?

Dubnium has an atomic number of 105. When dubnium-262 emits an alpha particle, _____ is the resulting daughter isotope.

It took 65.5 y for 30.0 g of a radioactive isotope to decay to 1.25 g. What is the half-life of this isotope?

The half-life of americium-241 is 432 y. If 2.00 g of americium-241 is present in a sample, what mass of americium-241 is present after 1,000.0 y?

PLS ANSWER IMMEDIATLY

1. One isotope of Br has a half-life of 16.5 hours. How much of a 2.00-gram sample remains at the end of 1.00 day?

2. The symbol for an electron also used to represent a(n)

   1. a) Alpha particle
   2. b) Beta particle
   3. c) Positron
   4. b) Gamma-ray

3. The half-life of a radioactive isotope

   1. a) Changes over time
   2. b) Is Constant
   3. c) Is a characteristic of stable isotopes
   4. d) Decreases in value as time passes

Assume that the amounts of weight that male college students gain during their freshman year are normally distributed with a mean of = 1.4 kg and a stand:

= 5.2 kg. Complete parts (a) through (c) below.

a. If 1 male college student is randomly selected, find the probability that he gains between 0 kg and 3 kg during freshman year.

The probability is ____

(Round to four decimal places as needed.)

b. If 4 male college students are randomly selected, find the probability that their mean weight gain during freshman year is between 0 kg and 3 kg.

The probability is ____

(Round to four decimal places as needed.)

c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30?

◯ A. Since the weight gain exceeds 30, the distribution of sample means is a normal distribution for any sample size.

◯ B. Since the distribution is of individuals, not sample means, the distribution is a normal distribution for any sample size.

◯ C. Since the original population has a normal distribution, the distribution of sample means is a normal distribution for any 

◯ D. Since the distribution is of sample means, not individuals, the distribution is a normal distribution for any sample size.

A gas storage tank is a 1.72 atm and 35 o C. What temperature is

the gas at if the pressure increases to 2.00 atm?

What is the difference between rancidity and oxidation

In preparation of p-iodonitrobenzene, the reaction is driven forward by the formation of N2 gas for two reasons. Reason number one is thermodynamic and reason number two is kinetic. Explain both of these reasons.