Answers
Answer:
1.25 g
Explanation:
Now we have to use the formula;
N/No = (1/2)^t/t1/2
N= mass of cesium-137 left after a time t (the unknown)
No= mass of cesium-137 present at the beginning = 5.0 g
t= time taken for 5.0 g of cesium-137 to decay =60 years
t1/2= half life of cesium-137= 30 years
Substituting values;
N/5= (1/2)^60/30
N/5= (1/2)^2
N/5= 1/4
4N= 5
N= 5/4
N= 1.25 g
Therefore, 1.25 g of cesium-137 will remain after 60 years.
Related Questions
1. What kind of intermolecular forces act between a chlorine monofluoride molecule and a hydrogen bromide moleculeNote: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.
Which of the following required Bohr's model of the atom to need modification ? A. Energies of electrons are quantized. B. Quantized electron energies are responsible for emission spectra lines. C. An electron's energy increases the farther it moves from the nucleus. D. Electrons do not follow circular orbits around the nucleus..
The elements fluorine chlorine and Iodine are all part of the same ___on the periodic table
The metal thallium becomes superconducting at temperatures below 2.39K. Calculate the temperature at which thallium becomes superconducting in degrees Celsius. Round your answer to decimal places.
Answers
The atoms having the same number of protons but a different number of neutrons have been termed isotopes.
The neutrons and protons are the constituents of the nucleus. The number of protons and electrons is equal in the atom. When two different atoms have the same number of protons the species have been termed isotopes. The atomic number of the species differ that resulting in the different positions in the periodic table.
For more information about the atoms, refer to the link:
Answers
The specie which is acting as a catalyst is; Ag+(aq).
Discussion:
The catalyst is a specie that exists in the same form at the beginning and end of the reaction.
The reaction's mechanism is as follows;
- Step 1: Ag+(aq) + Ce⁴+(aq) <-----> Ag²+(aq) + Ce³+(aq)
- Step 2: Tl+(aq) + Ag²+(aq) -----> Tl²+(aq) + Ag+(aq)
- Step 3: Tl²+(aq) + Ce⁴+(aq) -----> Tl³+(aq) + Ce³+(aq)
Evidently, although Ag+(aq) was converted to Ag²+(aq) in Step 1 of the reaction; the Ag²+(aq) is reverted back to Ag+(aq) in Step 2 of the reaction.
Read more:
Answer:
Ag⁺ acts as the catalyst.
Explanation:
Hello,
In this case, each step is reorganized:
- Step 1:
- Step 2:
- Step 3:
In such a way, Ag⁺ is converted to Ag²⁺ in the first step, but then it is regenerated to simple Ag⁺, therefore, Ag⁺ acts as the catalyst.
Best regards.
B) Solar power plants can be easily set up over small tracts of land.
Eliminate
C) Wastes from nuclear power plants are harmful and difficult to manage.
D) Solar energy is independent of season and can be easily trapped and stored.
Answers
Answer:
C
Explanation:
Wastes from nuclear power plants are harmful and difficult to manage.
Answer:
C
Explanation:
Answers
Answer:
The correct answer is Pu, 234.
Explanation:
In the given case, let us consider the reactant as X. Now the mass number (balanced) on both the sides will be,
Mass of X = Mass of Molybdenum + Mass of Tin + Mass of neutrons
M = 1 * 103 + 1 * 131 + 2 * 0
M = 234
Now the atomic number (balanced) on both the sides,
Atomic number of X = Atomic number of Molybdenum + Atomic number of Tin + Atomic number of neutrons
A = 1*42 + 1*50 + 2*1
A = 94
The atomic number 94 is for the element Plutonium, whose symbol is Pu. Thus, the reactant is 234-Pu.
a. Weather
b. Altitude
c. Latitude
d. Climate
Answers
Answer:
c. Latitude
Explanation:
The angular distance north or south from the earth's equator beginning at 0° at the equator and ending at 90° of either pole is the latitude.
The equator is a line of latitude that divided the earth into two hemispheres.
Only the equator is a great circle as a line of latitude. Others are small circles.
- Weather is the atmospheric condition of a place over a short period of time
- Climate is the average weather condition at a place over a long period of time.
- Altitude of a place is its elevation above a reference plane.