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1. The half-life of an isotope is 5 years. What fraction of the isotope will remain after 20 years?
2. The half-life of Bi-210 is 5 days. What percentage of a sample of Bi-210 will remain after 10 days?
What is the relationship between equilibrium constants of acid-base, complexometric, precipitation, and redox titration and the feasibility of titration? What are the similarities and differences of the four types of titration? Are there other factors that need to be considered when assessing the feasibility of titration?
1. Balance the following redox reactions:
a. CH4 + NO2 —> N2 + CO2 + H2O (oxidation number method)
2. When silver metal, Ag, is exposed to hydrogen sulfide gas, H2S, it tarnishes. Is the reaction of Ag with H2S a redox
reaction? How did you arrive at your answer? If your answer is yes, identify the RA and OA.
Design a flowchart for a program that accepts a unit price and quantity of items sold and displays total amount and VAT. (Note: Unit price is VAT exclusive. VAT rate is 16.5%.).
Write a C++ program that prompts the user for the fuel quantity and the fuel price per litre. The program should then print a fuel receipt like the one below: Receipt ======= Volume: 15.50 L Litre Price: MK 1380.50/L ------------ To be Paid: MK 21,397.75 ***End of receipt**
. The annual salaries of four men were $15,000, $16,000, $16,500, and $40,000.
Find the arithmetic mean of their salaries
The force between two electrical charges is 0.4 N. What would be the force if the charges are doubled, and the distance between them increased by 100%?
An underwater scuba diver sees the Sun at an apparent angle of 47.0° above the horizontal. What is the actual elevation angle of the Sun above the horizontal? (Use 1.333 for the index of refraction of water.)
° above the horizon
Assume a transparent rod of diameter d = 6.06 𝜇m has an index of refraction of 1.25. Determine the maximum angle 𝜃 for which the light rays incident on the end of the rod in the figure below are subject to total internal reflection along the walls of the rod. Your answer defines the size of the cone of acceptance for the rod.
Write a C++ program to enter a number represents a person age then display the
following on a message boxes:
1. "Wrong age" if the age less than or equal to 0 years.
2. "Child" if the age less than 8 years.
3. "Boy" if the age greater than or equal to 8 years.
4. "Young" if the age greater than or equal to 18 years.
5. "Old" if the age greater than or equal to 35 years.
6. "Very Old" if the age greater than or equal to 65 years.
#340153 on Dec 2023