Calculate the mass of the 4He nucleus in atomic mass units by subtracting the mass of two electrons from that of a neutral 4 He atom. (See Appendix D, and give four decimal places.) The procedure suggested for part (a) is theoretically incorrect because we have neglected the binding energy of the electrons. Given that the energy needed to pull both electrons far away from the nucleus is 80 eV, is the correct answer larger or smaller than implied by part (a), and by how much (in u)? In stating the mass of the nucleus, about how many significant figures can you give before this effect would show up?
Answers
The correct answer should be larger than implied by part (a) by \(0.0859 \times 10^{(-3)\) u.
What is atomic mass?The atomic mass (also known as atomic weight) of an element represents the average mass of atoms of that element, taking into account the different isotopes and their abundances. It is typically expressed in atomic mass units (u).
The atomic mass of an element can be found on the periodic
To calculate the mass of the 4He nucleus in atomic mass units (u), we need to subtract the mass of two electrons from that of a neutral 4He atom. Let's proceed with the calculations:
According to Appendix D, the atomic mass of a neutral 4He atom is approximately 4.0026 u. We'll subtract the mass of two electrons to obtain the mass of the nucleus.
The atomic mass of an electron is approximately 0.00054858 u (as listed in Appendix D). Therefore, the mass of two electrons is:
2 * 0.00054858 u = 0.00109716 u
Subtracting this value from the mass of a neutral 4He atom:
4.0026 u - 0.00109716 u = 4.0015 u
This is the mass of the 4He nucleus in atomic mass units according to the incorrect calculation in part (a), which neglected the binding energy of the electrons.
However, we are given that the energy needed to pull both electrons far away from the nucleus is 80 eV. This energy corresponds to the binding energy of the electrons, which contributes to the mass of the system.
To convert 80 eV to atomic mass units (u), we use the conversion factor given in Appendix D: 1 u = 931.5 MeV/c².
80 eV is equal to 80 eV / (931.5 MeV/c²) = \(0.0859 \times 10^{(-3)\) u.
Therefore, the correct answer should be larger than implied by part (a) by \(0.0859 \times 10^{(-3)\) u.
In terms of significant figures, it's important to note that the binding energy of the electrons introduces an uncertainty in the mass calculation. The energy given (80 eV) is only specified to two significant figures. As a result, the mass of the nucleus should also be reported with a similar level of precision to reflect this uncertainty.
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Related Questions
Chlorine gas is considered to be 100% pure, bleach is approximately 5 1/4% pure, while HTH dry powder chlorine is set at ___ % purity.
a.) 20%
b.) 45%
c.) 65%
d.) 80%
Answers
HTH dry powder chlorine is set at 65% purity. So, the correct answer is c.) 65%.
To maintain your pool clean, clear, and prepared for summertime enjoyment, it sanitises, manages algae, clarifies, softens pool water, even prevents stain and scale. sanitizer and shock therapy combined. eliminates algae and germs. softens, clarifies, and guards against scale and stains. Water that is clearly flashing blue in 24 hours. HTH is a potent chlorinating agent with a chlorine concentration of more than 30%. This substance is frequently used to disinfect swimming pools. Hence, HTH dry powder chlorine is set at 65% purity. So, the correct answer is c.) 65%.
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Gregor Mendel was a botanist, teacher
and monk. He was born in Austria. He
came up with the laws of Mendelian
inheritance in 1865. The laws explain
the principles of heredity.
Heredity
explains how offspring inherit traits
from parents. He figured out his laws
from studying pea plants. It turned out
those laws work for all living things.
They even work for people!
Which question is answered in this paragraph?
Answers
Answer:
C
Explanation:
It says he came up with the theory of heredity in the second paragraph, second sentence when it talks about his experiments with the pea plants.
what is the formula for sulfuric acid
Answers
Answer:
H₂SO₄
Explanation:
Hope this helps!
What is the volume, in liters, of 1.4 moles of CO2 gas at STP?
Answers
Answer:
22.4 L.
Explanation:
The weak ionization constant (Ka)
for HF is equal to:
[H3O][F]
[HFJ[H20]
[HF]
[F-][H30+]
Please help
![The weak ionization constant (Ka)for HF is equal to:[H3O][F][HFJ[H20][HF][F-][H30+]Please help](https://i5t5.c14.e2-1.dev/h-images-qa/contents/attachments/XYXUDtX84jtWd2RCowpNbxIiqeJ2jEAj.png)
Answers
Answer:
\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)
Explanation:
Write the reaction of HF (a weak acid) with water:
\(\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}\)
Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.
The equilibrium constant expression for this equation will hence be:
\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)
Note that pure solids and liquids are not included in the equilibrium expression.
In conclusion:
\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)
1. Which of the following species determines the chemical properties of an atom?
A. Electron
B. Neutron
C. Nucleus
D. Proton
2. The following glasswares are used to measure the volume of liquids except
A. graduated beaker
B. pipette
C. test tube
D. burette
3. Pauli exclusion principle is related to
A. quantity of electrons in the valence shell
B. filling the orbitals with lower energy first
C. the filling of degenerated orbitals
D. quantum numbers of electrons
Answers
Explanation:
The number of electrons, in turn, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element
Answer:
Question 1: (A)
The number of electrons determine the chemical properties of an atom.
Question 2: (C)
Test tube cannot measure the volume of liquids rather they are used in chemical reactions
Question 3: (D)
Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers.
Identify the parts of an atom
illustrated in the image.
1. Nucleus
2. Electron
3. Energy Levels
4. Proton
5. Valence Electrons
6. Neutrons
Answers
Answer:
2
Explanation:
Electron
How many grams of NaCl are in 100 g solution with water; when the solution is 19% NaCl by weight. 17 grams 23 grams 3 grams 19 grams Balance the following chemical reaction equation:
___SO2 + ___O2 -> ___SO3
The numbers listed below will be in order of the blanks listed. 2,1,1
1,3,1
2,1,2
2,2,2
What is the density of gasoline if 23.7 Liters has a mass of 20.2 Kg? (Make sure correct significant figures are used) 1.17 Kg/L 0.740 Kg/L 1.1733 L/Kg 0.7 kg/L
Answers
To calculate the grams of NaCl in a 100 g solution with water, when the solution is 19% NaCl by weight, we can use the formula:
Grams of NaCl = Total weight of solution (in grams) × Percentage of NaCl / 100
In this case, the total weight of the solution is 100 g and the percentage of NaCl is 19%. Plugging in these values:
Grams of NaCl = 100 g × 19 / 100 = 19 grams
Therefore, there are 19 grams of NaCl in the 100 g solution.
Regarding the chemical reaction equation, to balance it, we can use the coefficients to adjust the number of atoms on each side.
The equation is: ___SO2 + ___O2 -> ___SO3
The correct balanced equation is: 2SO2 + O2 -> 2SO3
The coefficients in this balanced equation indicate that we need 2 molecules of SO2, 1 molecule of O2, and 2 molecules of SO3 to balance the reaction.
B. To calculate the density of a substance, we use the formula:
Density = Mass / Volume
In this case, the mass of the gasoline is given as 20.2 kg and the volume is given as 23.7 liters.
Density = 20.2 kg / 23.7 L
Calculating this:
Density = 0.851 Kg/L
Rounding this value to the correct significant figures gives:
Density = 0.85 Kg/L
Therefore, the density of gasoline is approximately 0.85 kg/L.
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Calculate the pressure using the formula P=1.03+ mass on syringe/area of top of syringe
Answers
Answer:1.08
Explanation:
Answer:
1.08kg/cm^2
Explanation:
Edge2021
Baking soda is also known as sodium hydrogen
carbonate. What is the mass of 1.00 mol of sodium hydrogen carbonate
(NaHCO.)?
Answers
what two features must a sample have if it is to accurately represent a population
Answers
Answer:
It must be large
Random
Explanation:
For a sample to represent a population accurately, it must be large and contain random sample spaces.
A population is a group of organism of the same species living in a particular place where they can reproduce.
A sample must be representative of a given populationBy so doing, sampling space must be large so as to properly represent the species there in. The sampling must be done without any bias i.e. it must be randomly carried out.calculate the energy required to vaporize a chunk of ice at -25°C with the mass of 12.5kg
Answers
Explanation
Im not for sure if that’s correct so sorry if I get it wrong
The temperature of a sample of water increases from 20°C to 46.6°C as it absorbs 23,639.6 J of heat. What is the mass of the sample?
Answers
Answer: 213 g
Explanation:
propane reacts with oxygen to produce carbon dioxide and water
Answers
Propane reacts with oxygen producing carbon dioxide and water. This reaction is called combustion. The balanced chemical equation is written as follows:
C₃H₈ + 5O₂ → 3CO₂ + H₂O
Combustion is a type of reaction in which a gas reacts with the atmospheric oxygen forming carbon dioxide gas and water. Combustion is an exothermic thus, evolves heat energy to the surroundings.
Hydrocarbon gases such as propane easily undergoes combustion. Propane is C₃ H₈. Thus, the product side must have 3 carbons and 8 hydrogens.
The balanced chemical equation of the combustion reaction of propane is as written above. One mole of propane reacts with 5 moles of oxygen gas giving 3 moles of carbon dioxide and 4 moles of water.
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10. pls pls help me
Answers
Answer:
2c2h2+502=4co2+H2O
Explanation:
this is the answer
does a mixture of water (1) and 1-butanol (2) form a miscibility gap at 928c? if it does, what is the range of compositions over which this miscibility gap exists? note: you know that the van laar parameters for this system are as follows: l12
Answers
Yes, a miscibility gap exists for a mixture of water and 1-butanol at 928C. The range of compositions over which this gap exists is between the eutectic point and the upper cloud point.
The eutectic point is the composition where the two components form two liquid phases, and the upper cloud point is the composition where the two components form a single liquid phase.
The van Laar parameters for this system (L12) indicate the degree to which changes in temperature, pressure, and composition affect the relative solubility of the two components.
For a mixture of 1-butanol and water at 928C, the relative solubility of the two components decreases as the composition deviates from the eutectic point, resulting in a miscibility gap. The range of compositions over which this gap exists is determined by the van Laar parameters.
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What is the ratio by mass of these compounds a. 2na+cl2 =2nacl? b.h2o +nao=2naoh? c.hcl+naoh=nacl+h2o?
Answers
The ratio of the mass of compounds:
a. 2Na + Cl\(_{2}\) → 2NaCl = 46 + 70 → 46 : 70
b. H\(_{2}\)O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H\(_{2}\)O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8
What is a molecular mass?
Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.
Calculation:
a. 2Na + Cl\(_{2}\) → 2NaCl
The atomic mass of Na= 23The atomic mass of Cl= 35(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)
(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)
46 + 70 → 46 : 70
b. H\(_{2}\)O + NaO → 2NaOH
The atomic mass of H = 1The atomic mass of O= 16Atomic mass of Na= 23(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)
(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)
2 : 16 + 23 : 16 → 46 : 32 : 2
1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H\(_{2}\)O
The atomic mass of H= 1The atomic mass of Cl= 35The atomic mass of Na= 23The atomic mass of O= 16(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)
(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)
1 : 35 + 23 : 35 → 23: 35 + 2: 16
1 : 35 + 23 : 35 → 23 : 35 + 1: 8
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in what kind of orbitals do the lone-pair electrons on the oxygen of methanol reside, and are they in the same plane as the hydrogen and the group? both lone pairs reside in sp3 orbitals; they are co-planar with the hydrogen and the group. both lone pairs reside in sp3 orbitals; they are not co-planar with the hydrogen and the group. both lone pairs reside in sp2 orbitals; they are not co-planar with the hydrogen and the group. both lone pairs reside in sp2 orbitals; they are co-planar with the hydrogen and the group.
Answers
Both lone pairs of electrons on the oxygen of methanol reside in sp3 orbitals. They are not co-planar with the hydrogen and the group.
In methanol, the oxygen atom is bonded to a single carbon atom and one hydrogen atom. Oxygen is a group 6 element and has 6 valence electrons. In the Lewis structure of methanol, it forms one single bond with the carbon atom and one single bond with the hydrogen atom, which means it has 2 lone pairs of electrons remaining.
The orbitals in which these lone pairs of electrons reside are known as hybrid orbitals. In the case of the oxygen atom in methanol, the lone pairs of electrons are in hybridized sp3 orbitals. This is because the oxygen atom has four orbitals available for bonding:
One 2s Three 2p orbitals.To form four sigma bonds with other atoms, these four orbitals are hybridized to form four sp3 hybrid orbitals. These hybrid orbitals are arranged in a tetrahedral shape around the oxygen atom.
Regarding the co-planarity of the hydrogen and the group, the hybridized sp3 orbitals form a tetrahedral arrangement around the oxygen atom, which means that the orbitals are not co-planar with the hydrogen and the group.
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Find the specific heat of an unknown material with an initial temperature of 20°C, when 5000 Joules are applied to a 50 gram sample and the final temperature is 70°C
Answers
Answer:
2J/g°C
Explanation:
Q = 5000J
Initial temperature (T1) = 20°C
Final temperature (T2) = 70°C
Specific heat capacity (c) = ?
Heat energy (Q) = mc∇T
Q = mc∇T
Q = mc(T2 - T1)
5000 = 50 × c × (70 - 20)
5000 = 50c × 50
5000 = 2500c
c = 5000 / 2500
c = 2J/g°C
The specific heat capacity of the substance is 2J/g°C
Which compound is not a fertiliser?
A ammonium sulfate, (NH4)2SO4
B calcium hydroxide, Ca(OH)2
C potassium chloride, KCl
D urea, CO(NH2)2
Answers
The compound that is not a fertilizer is calcium hydroxide (option B).
What are inorganic fertilizer?A fertilizer is a substance, whether natural or synthetic, that is used to make the ground more suitable for growing plants.
Chemical fertilizers are substances that are applied to soils or directly to plants in order to give nutrients that are optimal for their growth and development.
These fertilizers contain essential minerals that the plants can absorb such as;
nitrogenphosphoruspotassiumAmmonium sulfate, ammonium phosphate, ammonium nitrate, urea, ammonium chloride are examples of chemical fertilizers.
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A-10
A-6
Group mL A-8 mL mL A-2mL
1 10.6 8 6.2 2.1
2
9
9 7
N
3
11
9
7
3
4
10.4
8.4
6.2
2.1
5
10.39
8.39
6.3
2.3
6
11
9
7
3
Answers
Answer: good
Explanation:
tyuk
A substance that reduces the hydrogen ion concentration of a solution is __________.
Answers
A substance that reduces the hydrogen ion concentration of a solution is base.
A base which thus completely dissociates in an aqueous solution is referred to as a strong base. These substances produce one or more hydroxide ions (OH-) per base molecule when they ionize in water. A weak base, on the other hand, only partially splits into its water-soluble ions.
The three definitions of "base" used in chemistry are Arrhenius base, Bronsted base, as well as Lewis base. The fact instead that bases react towards acids is acknowledged by all base definitions.
Therefore, a substance that reduces the hydrogen ion concentration of a solution is base.
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Convert a measurement of 89 cg to its equivalent in mg
Answers
Answer:
1 cg = 10 mg
Explanation:
So, 89cg = 89 * 10 = 890mg!
Pls thank, 5star, and brainliest!
Once a product is ready to be sold, engineers must explain their ideas to people who will bring the product to consumers.
Please select the best answer from the choices provided
ОТ
OF
Answers
Answer:
ot
Explanation:
there is no choices
Answer:
Advertise
Explanation:
once a product is ready to be sold, engineers explain their ideas to marketing people, who will advertise the product.
what is a galvanic cell made of?
A. two electrodes in electrolyte solution
B. two beakers connected by a tube
C. two ceramic plates in pure water
D.two medal strips surrounded by air
Answers
Explanation:
A because A galvanic cell consists of two half-cells, such that the electrode of one half-cell is composed of metal A, and the electrode of the other half-cell is composed of metal B; the redox reactions for the two separate half-cells are thus: An+ + ne− ⇌ A.
Answer:
A
Explanation:
5. How many hydrogen atoms are in 1 gallon of octane?
Density of octane= 0.7028 g/mL, 3780 mL = 1 gal
Answers
The chemical formula for octane, C8H18, is an alkane and a hydrocarbon. Its condensed structural formula is CH3(CH2)6CH3. The amount and location of branching in the carbon chain determine the various structural isomers of octane.
Carbon is represented by the letter C, octane by the formula C8H18. As a result, there will be 8 moles of carbon for every mole of C8H18.
Utilizing the molar mass of octane, convert 20 kg of octane to moles of octane.
Octane's molar mass is calculated as (8*12.011)+(18*1.008)=114.23 g/mole, where 8 and 18 are the molecule's atoms and 12.011 and 1.008 are the carbon and hydrogen atoms' individual molar masses.
20kg C8H18*1000g/kg*mole
C8H18/114.23g C8H18 = 175.1 moles of octane.
Put that quantity of moles into moles of carbon now:
1400.8 mole C is equal to 175.1 mole C8H18 * (8 mole C/mole C8H18).
Now keep in mind that a mole of a specific element equals 6.022*1023 atoms.
As a result, your final answer of 8.4*1026 atoms, or 1400.8 mole C, is identical to 1400.8*(6.022*1023) atoms C.
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Water is formed when 48g of oxygen combine with 6g of hydrogen. What mass of oxygen combines with 2g of hydrogen?
A. 12g
B. 16g
C. 96g
D. 144g
Answers
Answer:
B. 16g
Explanation:
3. Define the following:
a. electromagnetic radiation
b. wavelength
c. frequency
d. quantum
e. photon
Answers
How is it possible that a substance like liquid nitrogen can boil when it is very cold?
help needed...
Answers
Answer:
Liquid nitrogen, on the other hand, boils at a much colder temperature. Liquid nitrogen boils at -320 degrees. That means that as soon as LN2 leaves our special holders and hits the air, it instantly vaporizes because the air around it is so cold.
Explanation:
please help. I was hoping someone could explain it , cause I have no idea what I'm doing PLEASE HELP. ASAP!!!!
Answers
The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.
What is the enthalpy?We know that the enthalpy of neutralization is defined as the heat that is evolved when an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.
To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.
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