Radioactivity
1. Complete the following equation by determining the values of U and V.
Th Pa + e
U……… V……………..
2. (a) Distinguish between nuclear fusion and fission
(b) Compete the nuclear equation below:-
3. Uranium -238 disintegrates by emitting an alpha particle to form substance Y.
Nuclide Y emits a beta particle to form substance Z. Write down nuclear equations to show how
substance Y and Z are formed (U=At No. 92)
4. (a) What is a nuclide?
(b) The graph below shows the radioactive decay of a certain nuclide. Determine the
half-life of the nuclide
(e) What effect do excessful exposures of radiation have on metals?
5. (a) State one way in which nuclear reactions differ from ordinary chemical reactions
(b) The following is a part of Uranium decay series
(i) Which particles are emitted in step I and II
(ii) If a beta particle is emitted in step III, find Z and A
(iii) If the activity of Thorium -234 is reduced to 25% in 48hours, find its half life
6. Substances A and B are represented by the formulae ROH and RCOOH respectively.
They belong to two different homologous series of organic compounds. If both A and B
react with potassium metal:
(a) Name the common product produced by both
(b) State the observation made when each of the samples A and B are reacted with sodium
hydrogen carbonate
(i) A
(ii) B
7. Some two elements are represented as:
(a) How many protons does X have?
(b) How many neutrons does Y have?
(c) Draw the structure of the compound formed between X and Y
8. Y grams of a radioactive isotope take 120days to decay to 3.5grams. The half-life period
of the isotope is 20days
(a) Find the initial mass of the isotope
(b) Give one application of radioactivity in agriculture
9. Study the nuclear reactions given and answer the questions that follow:
X Y Z
(a) Write an equation for the nuclear reaction in step II (lmk)
(b) Give one use of Y (lmk)
10. Give two uses of radioactive isotopes in medicine.
11. Study the information in the following table and answer the questions that follow. The letters
do not represent the actual chemical symbols of the elements.
ELEMENT U V W X Y Z
NUMBER OF PROTONS 18 20 6 16 19 17
NUMBER OF NEUTRONS 22 20 8 16 20 20
Which of the above elements are:
(i) Likely to be radioactive?
(ii) Able to form a compound with the highest ionic character?
12. The isotope decays by Beta, b -emission to a stable nuclide. The half-life of the
isotope is 15hours 2.0g of is allowed to decay. Determine the mass of left after 90hours
13. (a) Complete the following nuclear equation
Cr Mn + ____________
(b) 100g of a radioactive substance was reduced to 12.5g within 15.6 years. Determine
the half-life of the substance
14
7
14
6
Step IIStep I12
6
Try it now!
How it works?
Follow these simple steps to get your paper done
Place your order
Fill in the order form and provide all details of your assignment.
Proceed with the payment
Choose the payment system that suits you most.
Receive the final file
Once your paper is ready, we will email it to you.
Our Services
Quality Essay Help has stood as the world’s leading custom essay writing services providers. Once you enter all the details in the order form under the place order button, the rest is up to us.
Essays
At Quality Essay Help, we prioritize on all aspects that bring about a good grade such as impeccable grammar, proper structure, zero-plagiarism and conformance to guidelines. Our experienced team of writers will help you completed your essays and other assignments.
Admissions
Admission and Business Papers
Be assured that you’ll definitely get accepted to the Master’s level program at any university once you enter all the details in the order form. We won’t leave you here; we will also help you secure a good position in your aspired workplace by creating an outstanding resume or portfolio once you place an order.
Editing
Editing and Proofreading
Our skilled editing and writing team will help you restructure you paper, paraphrase, correct grammar and replace plagiarized sections on your paper just on time. The service is geared toward eliminating any mistakes and rather enhancing better quality.
Coursework
Technical papers
We have writers in almost all fields including the most technical fields. You don’t have to worry about the complexity of your paper. Simply enter as much details as possible in the place order section.