Positrons are spontaneously emitted from the nuclei of(1) potassium-37 (3) nitrogen-16
(2) radium-226 (4) thorium-232
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Answer: Option (1) is the correct answer.
Explanation:
- A positron is a small particle which contains a +1 charge and its mass is equal to the mass of an electron, that is,
kg.
A positron is represent by the symbol .
For example,
- Whereas nitrogen-16 does not decay to give a positron because nitrogen-16 is the daughter isotope formed due to decay of oxygen-16.
The decay reaction is as follows.
- And, on radioactive decay of thorium-232 there will be formation of radium-228 along with emission of an alpha particle.
The reaction will be as follows.
Therefore, we can conclude that out of the given options positrons are spontaneously emitted from the nuclei of potassium-37.
Related Questions
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It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!"How would you respond to Roger? A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place. B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change. C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change. D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
I need help with this molecular formula problem really quick!!
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The heat of combustion (Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions.
3.05988g. grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C.
What is meant by heat of combustion?
- The heat of combustion (
Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions. In most cases, a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and heat.
- The heat of combustion of a substance is the amount of energy released when a specific amount (e.g., 1 mol, 1g, 1 L) of the substance completely burns in oxygen. The heat of combustion is typically measured at 298K (25 C) and 101.3kPa.
- The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.
q=m*c*(change of T)
q=10000g(0.385J/g*c)*(65.0C-25.0C)or (338.2 K-298.2K)
q=154000J
154000J*(1 mol/2220 KJ)=69.36936 x mol
here's where I'm stuck
0.069369 mol
and i know that for every 1 mol there is 44.11g of C3H8.
0.069369 mol* (44.11g C3H8)/1mol = 3.05988g.
To learn more about : Heat of combustion
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Answer:
Explanation:
q = (mass) (temp change) (specific heat)
q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ
154 kJ / 2220 kJ/mol = 0.069369369 mol
0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)
answer choice 4
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Answers
Each line represents a single bond (two electrons), and the lone pairs of electrons are shown as dots. Carbon forms single bonds with three hydrogen atoms and one bromine atom, resulting in a stable Lewis structure that satisfies the octet rule for each element and minimizes formal charges.
To draw the Lewis electron-dot diagram for bromomethane (CH3Br), follow these steps:
Determine the total number of valence electrons for each element in the molecule:
Carbon (C) has 4 valence electrons.
Hydrogen (H) has 1 valence electron.
Bromine (Br) has 7 valence electrons.
Calculate the total number of valence electrons by adding the contributions from each element:
Carbon: 4 electrons x 1 atom = 4 electrons.
Hydrogen: 1 electron x 3 atoms = 3 electrons.
Bromine: 7 electrons x 1 atom = 7 electrons.
Total = 4 + 3 + 7 = 14 electrons.
Determine the central atom. In CH3Br, carbon is the central atom.
Connect the central carbon atom to the surrounding hydrogen and bromine atoms using single bonds (each bond consists of two electrons).
Distribute the remaining valence electrons as lone pairs on the outer atoms to satisfy the octet rule. Hydrogen can only accommodate two electrons (a duet), and bromine can expand its octet.
Calculate the formal charges to ensure that the Lewis structure represents the most stable arrangement of electrons. In CH3Br, the formal charges should ideally be as close to zero as possible.
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This is some kind of is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F)... see image below! ;-)
Final answer:
The intermolecular forces that exist between molecules of NH3, H2O, and HF are hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
Explanation:
The intermolecular forces that exist between molecules of NH3, H2O, and HF are called hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Hydrogen bonding occurs between a hydrogen atom bonded to a highly electronegative atom (such as O, N, or F) and a lone pair of electrons on a nearby molecule. Dipole-dipole interactions occur between molecules with permanent dipole moments, while London dispersion forces occur due to the temporary formation of induced dipoles in adjacent molecules.
B. This energy source causes no pollution, but the fuel is a nonrenewable resource
C. Very little fuel is necessary to produce a large amount of energy but the waste materials are harmful to the environment.
D. The fuel is inexpensive , but using the energy produces air pollution.
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Final answer:
Option C accurately depicts a trade-off of nuclear energy. It is highly efficient in generating power from a small quantity of fuel but generates harmful radioactive waste.
Explanation:
The correct statement which accurately describes a trade-off of using nuclear energy to produce electricity is: C. Very little fuel is necessary to produce a large amount of energy but the waste materials are harmful to the environment.
Nuclear power plants generate a significant amount of energy from a small amount of fuel (nuclear fission). This makes them a highly effective source of power. However, one of the key trade-offs is the radioactive waste produced, which needs careful management and disposal to ensure it doesn’t harm the environment or human health.
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Answer:
Your answer is B here is your lucky day
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Answer:
A suction bulb or pipette pump to suction the sample.
Explanation:
There are different types of pipettes that can be used in a laboratory:
- Volumetric pipette-used to transfer a specific calculated amount of liquid
- Graduated pipettes-used to transfer different calculated amounts of liquid from one container to another.
- Micropipettes-used to transfer small amounts of liquids
- Pasteur pipettes- just like micropipettes, pasteur pipettes are used to transfer small amounts of liquids, but manually. They are also called droppers.