How do you calculate the number of moles when given the number of particles?
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Answer:
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Related Questions
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PLEASE HELP WILL GIVE BRAINLIEST​
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It is impossible to divide an atom into smaller parts.
There are electrically neutral particles inside atoms.
Atoms contain small, negatively charged particles.
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Answer: The correct statement is atoms contain small, negatively charged particles.
Explanation:
J.J.Thomson was a scientist which discovered electrons that are present in an atom.
He did an experiment and gave a model for this. The experiment conducted by him was Cathode Ray experiment and the model given by him was Plum pudding model.
From cathode ray, he showed that the cathode ray was composed of a negatively charged particles and named it as electrons. From plum pudding experiment, he said that the electrons are embedded in the atom. These particles carry negative charge and are very small as compared to the atom.
Hence, the correct statement is atoms contain small, negatively charged particles.
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Answer:
The type of solar radiation that is the most powerful is the Ultraviolet Radiation.
Explanation:
Ultraviolet Radiation is the radiation that has the shortest wavelength (360 nanometers), which carries a lot of energy and interferes with molecular bonds. Especially those less than 300 nanometers, which can alter DNA molecules, very important for life. These waves are absorbed by the upper part of the atmosphere, especially by the ozone layer.
The damage that ultraviolet rays can cause to humans include effects on the skin such as irritation, wrinkles, loss of elasticity, spots and cancer; also possible conditions at the ocular level and can trigger systemic lupus erythematosus.
The most powerful type of solar radiation is known as gamma radiation.
Gamma radiation consists of high-energy photons and is part of the electromagnetic spectrum. It has the highest frequency and shortest wavelength among the various types of solar radiation, which include gamma rays, X-rays, ultraviolet (UV) radiation, visible light, infrared (IR) radiation, and radio waves. Gamma radiation is generated by nuclear reactions, such as those occurring in the core of the Sun and in other high-energy processes in the universe. Due to its high energy, gamma radiation can penetrate deeply into matter and has the potential to cause ionization and damage to living cells.
Therefore, it is important to limit exposure to gamma radiation and take appropriate safety precautions when working with radioactive materials or in environments with high levels of gamma radiation.
Learn more about solar radiation here:
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calcium-40
molybdenum-98
mercury-194
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The "mercury-194" is a kind of isotope which is untastable and radioactive.
What is isotope?
Isotopes may be members of the very same element's family but also have variable counts of neutrons despite roughly the identical count of protons.
What is radioactive?
An unstable nucleus of an atom releases energy through radiation in a process known as radioactive decay.
Therefore, the "mercury-194" is a kind of isotope which is untastable and radioactive.
To know more about isotope and radioactive
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Answer: Mercury-194 is an unstable isotope and hence is radioactive.
Explanation: Mercury-194 is an isotope of mercury, having formula
Number of protons in this isotope = 80
Number of neutrons in this isotope = 114
This isotope is radioactive in nature and under decay process by Electron Capture.
Electron capture reactions are the reactions in which a proton in a nucleus absorbs an electron and convert it into neutron. The resulting nucleus will have a decreased atomic number and same atomic mass.
Reaction for electron capture of mercury-194 follows:
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Answer:
CaCO3 + 2HCL -> CO2 +H2O + CaCl2
Explanation:
When balancing an equation, it is important to first ensure that the chemical formulas in the equation are correct. In the above equation, the first modification required is for CaCl to be corrected to CaCl2. This is because the calcium ion has a charge of 2+ which has to be balanced by 2 chloride ions, each of charge 1-
Next, the overall atoms of the equations should be balanced. The number of atoms of each element on the side of reactants should be equal to their number on the side of the products. In this case, the number of HCL molecules should be 2.
Before balancing equation:
Reactants: Ca: 1, C: 1, O: 3, H: 1, Cl: 1
Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 1
After balancing equation:
Reactants: Ca: 1, C: 1, O: 3, H: 2, Cl: 2
Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 2
:CaCO3+2HCl---> CO2+ H2O+CaCl2
B:Mintu should have decreased the time he touches the two metals
C:Mintu should have chosen a material with a lower specific heat
D:Mintu should have chosen a material the same temperature as the iron.
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Answer: Option (C) is the correct answer.
Explanation:
The amount of heat necessary to raise the temperature of 1 gram of a substance by is known as specific heat of a substance.
Mathematically, q =
where, q = Heat energy
C = specific heat
= change in temperature
Hence, smaller is the amount of heat required by a substance to raise the temperature of its 1 g by more readily it will get hot.
Therefore, out of the given options specific heat of copper is small. So, copper will heat up quickly.
Thus, we can conclude that Mintu's error is that Mintu should have chosen a material with a lower specific heat.
Answer:
C - Mintu should have chosen a material with a lower specific heat.
Explanation:
0n edge 2020