Answer:
This is true. A seismograph measures the size of a volcano eruption by detecting the vibrations that are produced by the volcanic activity. The vibrations can then be converted into a numerical value that represents the magnitude of the eruption.
Explanation:
What will be the pH of solution after sodium acetate solution in the middle or the last column reacts with the specified concentration of HCl
The pH of the final solution will be less than 7, but closer to 7 if the initial concentration of sodium acetate is high and the concentration of HCl is low.
The pH of a solution after a reaction with a strong acid like HCl will depend on the concentration of the acid and the concentration of the acetate ions (CH3COO-) in the sodium acetate solution. Sodium acetate (CH3COONa) is a weak base, and when it reacts with HCl, it forms acetic acid (CH3COOH) and sodium chloride (NaCl). The equation for this reaction is: CH3COONa + HCl → CH3COOH + NaClThe pH of a solution is a measure of the concentration of hydronium ions (H3O+) in the solution, so the pH of the solution after the reaction will depend on the concentration of H3O+ ions and the concentration of acetate ions. If the reaction is done in aqueous solution, the acetic acid formed will dissociate to form H3O+ and acetate ions. The acetate ions will neutralize some of the H3O+ ions, thus decreasing the overall acidity of the solution. The pH of the final solution will be less than 7, but closer to 7 if the initial concentration of sodium acetate is high and the concentration of HCl is low. It's important to note that without knowing the initial concentration of sodium acetate and the volume of the solutions it is not possible to determine the final pH.
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What is the molarity of a solution in which 0.23 moles of NaCl are dissolved in enough water to make 395.6 mL of solution
The molarity of NaCl in enough water is 0.582[tex]\frac{mol}{mL}[/tex]
The moles of NaCl is given which is 0.23 and NaCl is dissolved in enough water which makes the solution of 395.6 mL.
The total number of moles of solute present in a given solution per litre is known as its molarity. In contrast to mass, which varies as the system's physical circumstances vary, the volume of a solution changes as a function of changes in the system's physical qualities, such as pressure and temperature. This has an impact on the molality of the solution. The symbol M, sometimes known as a molar, denotes molarity. A solution is considered to be one molar when one gram of the solute dissolves in one litre of the solution.
So, the molarity= [tex]\frac{totalnumber of moles}{total volume }[/tex]
molarity=[tex]\frac{0.23}{0.395}[/tex]
molarity=0.582[tex]\frac{mol}{mL}[/tex]
Hence, the molarity is 0.582.
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What is the relationship between properties and substances?
The relationship between properties and substances is an important one as the properties define or describe the type, kind or composition of a substance. There are two factors that affect the properties of a substance and these are kinetic energies and intermolecular forces.
In chemistry, substances are categorized on the basis of physical and chemical properties. All the substances are composed of tiny particles which are in constant motion due to kinetic energy and keep moving in all directions in a substance.
In addition to this, intermolecular forces are also present in a substance which keeps the particles together. In this way substances maintain their shape, arrangement and properties such as melting point, boiling point, hardness, composition and color due to their particular properties.
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Give an example of direct and indirect evidence geologists use to study the interior of the Earth
Geologists use rock samples including sedimentary rocks as direct evidence and seismic waves as indirect evidence.
What are sedimentary rocks?They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.
The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.
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Ethylene burns in oxygen to form carbon dioxide and water vapor:
C2H4(g) + 3 02(g) --> 2 CO2(g) + 2 H2O(g)
How many liters of water can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are
consumed in this reaction?
67.0L of H₂O can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are consumed in this reaction.
What do you mean by mole?A mole is know to be the unit used in chemistry to measure the amount of a substance. It is defined as the amount of matter that contains as many atoms, molecules, or other particles as there are in 12 grams of carbon-12. Moles are a convenient way to measure large numbers of very small particles such as atoms, molecules, ions and electrons.
The molar volume of gas at 1.00 atm and 298 K is 22.41 L/mol.
Given that
2 moles of water are produced from 1 mole of ethylene,
The number of liters of water produced can be calculated with the following formula:
1.25 L C₂H₄ x (2 mol H₂O / 1 mol C₂H₄) x (22.41 L H₂O / 1 mol H₂O)
= 67.0 l H₂O
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What does an element box contain?
The element box contains name and symbol of the element, number of protons and electrons, atomic mass, and electron configuration.
Each container represents an detail and incorporates its atomic size, symbol, common atomic mass, and (sometimes) name. The factors are organized in seven horizontal rows, referred to as intervals or series, and 18 vertical columns, referred to as groups. The container containing every detail's records is called the detail key. Each key incorporates an detail's name, precise symbol, atomic weight and atomic variety. Oxygen, for example, has an atomic variety of 8, an atomic weight of 15.996 and a completely unique symbol, O. The table is split into 4 more or less square regions referred to as blocks. The rows of the desk are referred to as intervals, and the columns are referred to as groups. Elements from the equal institution of the periodic table display comparable chemical characteristics.
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1. How many moles of propane are present at STP if the volume is 65.0 L? Please show all work
Answer:
Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L
Explanation:
First, we need to calculate the number of moles of propane present at STP. At STP, the temperature is 273 K and the pressure is 1 atm.
Using the Ideal Gas Law, we can calculate the number of moles of propane present in the given volume.
PV = nRT
n = 4.47 mol
Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L
The theoretical yield of NaBr from 2.36 mol FeBr3 is 7.08 mol NaBr. What is the percent yield if 6.14 mol NaBr were collected?
The percent yield for the reaction in this example is 100%, which is equal to the theoretical yield of NaBr from 2.36 mol FeBr3 of 7.08 mol NaBr.
What is NaBr's theoretical yield?The lesser amount, or 13.7 g NaBr, represents the potential yield. 15.45 grams of NaBr can never be produced because after 13.7 grams of NaBr are created, the reaction runs out of NaI and stops generating NaBr product. As the limiting reactant, NaI is well-known.
How is % yield determined?The final answer is expressed in percent by dividing the experimental yield by the theoretical yield and multiplying the result by 100. In general, the percent yield value is less than 100%,
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Answer: 87%.
Explanation:
What are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are mass and volume.
What is chemical substances?Chemical substances are any material made up of atoms and molecules that have distinct chemical properties. They include elements, compounds, and mixtures of elements and compounds. Chemical substances are the building blocks of all matter, from the atoms and molecules that make up the smallest particles to the complex structures of living organisms. Chemical substances can exist in various states, such as solid, liquid, and gas, and can react with other substances to form new compounds or break down into simpler substances. Chemical substances are important in many areas of science, including chemistry, biology, geology, and physics.
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What do your results tell you about the directing effects of the substituents on salicylamide?
The amide group in salicylamide is electron withdrawing, the hydroxyl group on the ring is a highly active, electron donating substituent. The hydroxyl group donates electrons, guided entry iodide to a para position.
What does the word "substituent" signify in chemistry?A substituent is an atom that are substituted for an atom here on parent chain of such a hydrocarbon in both chemistry and biochemistry constituting a moiety of the resulting new molecule.
Alkyl groups: are they substituents?Alkyl groups are substitutes created from alkanes. The names of alkyl groups and unbranched alkane chains are similar. Alkyl groups may branch as well. For instance, the butyl substituent has three constitutional isomers.
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For which d orbital(s) do the lobes point directly at the ligands in a square-planar crystal field? Check all that apply.
O dzy
O dz2
O dzz
O dzy y^2
O dyz
submit
The dz2 and the dx2-y2 orbitals have lobes that point directly at the ligands in a square-planar crystal field in d orbitals.
The d orbitals are a set of atomic orbitals found in the second energy level (n = 2) of an atom. They have a higher energy than the s and p orbitals in the first energy level (n = 1), and are represented by the letters d, dx, dy, dz and dxy, dxz and dyz.The d orbitals are composed of four orbitals which are degenerate (having the same energy) in an isolated atom. But when an atom is in a compound, the d-orbitals split into different energy levels due to the influence of the electrostatic forces of the neighboring atoms. This is called the crystal field splitting, which depends on the symmetry of the crystal and the coordination number of the central atom.
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Propane gas (C3H8) is ignited. Type of reaction ________ ignition ___________________ Balanced chemical equation:
Propane gas (C3H8) is ignited. Type of reaction combustion ignition.
[tex]C_3H_8(g)+5O_2(g) < = > 3CO_2(g)+4H_2O(l)[/tex] Balanced chemical equation.
A balanced chemical reaction is what?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
Propene is an alkene because why?The parent chain is the longest chain of carbon atoms that contains the double bond. Its name has the same stem as an alkane with the same number of carbon atoms, but it is designated as an alkene by adding the suffix -ene. Propene is the resultant chemical, CH2=CHCH3.
What does a balanced chemical equation entail?In accordance with the Law of Conservation of Mass, mass cannot be generated or destroyed in a chemical reaction. A balanced chemical equation has an equal number of atoms of each element on the left and right sides of the reaction.
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56. A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the
volume of this sample when its temperature is increased to 30.°C while its pressure is decreased to
90. kilopascals?
A) 2.5 L
B) 2.0L
C) 1.6L
D) 0.22 L
V2 = 2.499 2.5 L is the sample's volume when its temperature is raised to 30 °C and its pressure is lowered to 90 kilopascals.
What does the word "volume" actually mean?
The volume of an item is the space occupied inside its three-dimensional boundaries. A other word for it is the object's capacity.
What is the volume of the liquid?
The volume of liquid measured in a vessel's standard units is known as the liquid measurement. Infant milk bottle with milliliter measurement indications and juice bottle with a 1 liter capacity are two examples of vessels that have a "capacity" or "volume."
As,
Gas constant R is constant, so, Ideal gas equation can be written as,
P₁ V₁ / T₁ = P₂ V₂ / T₂
Solving for V₂,
V₂ = (P₁ × V₁ × T₂) ÷ (T₁ × P₂)
Putting Values,
V₂ = (101.325 KPa × 2 L × 303 K) ÷ (273 K × 90 KPa)
V₂ = 61402.95 ÷ 24570
V₂ = 2.499 ≈ 2.5 L
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Indicate whether each of the following molecules is capable of geometrical (cis-trans) isomerism. Check all that apply. O 1,3-dichloro-2-butene O 1,4-dichlorobenzene O 1,1-dichloro-1-butene O 4,5-dimethyl-2-pentyne
1,3-dichloro-2-butene and 1,1-dichloro-1-butene.Geometrical isomerism, also known as cis-trans isomerism, occurs when a molecule has two or more structural isomers that differ in the spatial arrangement of the atoms.
Cis-trans isomerism is only possible when the molecule has at least one carbon-carbon double bond. In this type of isomerism, the two isomers differ in the orientation of the substituent groups around the double bond. 1,3-dichloro-2-butene and 1,1-dichloro-1-butene both contain a carbon-carbon double bond and are therefore capable of geometrical isomerism. 1,4-dichlorobenzene does not contain a carbon-carbon double bond and therefore is not capable of geometrical isomerism. 4,5-dimethyl-2-pentyne also does not contain a carbon-carbon double bond and is therefore not capable of geometrical isomerism.
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How many moles is 20 grams?
0.5 moles are present in 20 grams of calcium.
The mole, which is denoted by the symbol "mol," is the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilograms of carbon 12.
The number of atoms, molecules, or ions that make up one mole of a substance is 6.022 × 10²³ . The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 × 10²³
Atomic Mass of Calcium = 40u
(Atomic Mass is same as Molar Mass, so)
Molar Mass of Calcium = 40g
Formula to find number of moles
Number of Moles = given mass / molar mass
= 20 / 40 = 0.5 moles
Therefore, 0.5 moles are present in 20 grams of calcium.
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The complete question is
How many moles are there in 20 g of calcium
Consider the following reaction: CS2(g) + 4H2(g) CH4(g) + 2H2S(g). The equilibrium constant K is about 0.31 at 900.°C. What is Kp at this temperature? A) 2.9 103 B) 3.2 10–3 C) 3.3 10–5 D) 3.0 101 E) 1.1 10–3
The Kp of the reaction as it has been shown is 2.9 × 10^3 Option A
What is the Kp?We know that the equilibrium constant is the constant that has to do with the ease with which the reactants that are in the system can be converted into the products. In this case we have been given the reaction equation as it has been shown in the question.
Let us all now bear in mind that the reaction ghat we have here is a gas phase reaction and since the reaction is a gas phase reaction the equilibrium constanta that has been given as K can also be written in terms of the partial pressures of the gasses that are present in the system and this ius the bed rock of the answer that we woulod give above. The Kp can now be written as a scientific notation as shown above.
Then;
kp = Kc/(RT)^∆n
Kp = equilibrium constant using pressure
Kc = equilibrium constant using concentration
R = gas constant
T = temperature
n= difference in number of moles
Kp = 0.31/(0.082 × 1173)^-2
Kp = 2.9 × 10^3
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How many planes of cleavage does this mineral have? Choose one: A. 0 B. 2 at 90° intersections C. 3 not at 90° intersections D. 1
The planes of cleavage that the mineral have is 1 as the mineral name is Muscovite mica.
The crystal lattice structure of a mineral affects its propensity to split or break along flat planar faces, or cleavage. These 2D surfaces, also known as cleavage planes, are produced by the alignment of atoms in the crystal structure or lattice through relatively weak connections.
The mineral depicted in the image is called "Muscovite mica," and it has layers that seem like flat sheets. Muscovite mica is far more likely to break along the layers because it only has weakly bonded potassium ions. There is just one ideal cleavage plane as a result. This cleavage is evident in the capacity to peel mica sheets.
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Consider the reaction H2 + I2 2HI for which K = 44.8 at a high temperature. If an equimolar mixture of reactants gives the concentration of the product to be 0.50 M at equilibrium, determine the equilibrium concentration of the hydrogen.
A) 1.1 * 10^–1 M
B) 7.5 * 10^–2 M
C) 3.7 *10^–2 M
D) 1.3 * 10^1 M
E) 5.6 * 10^–3 M
Equilibrium constant K= 44.8 for H₂ + I₂ → 2HI Equimolar reactants, HI = 0.50M, H₂ = 5.6×10⁻³ M. The correct option is e.
given equilibrium constant (K) and the equilibrium concentration of the product HI = 0.50M
balanced equation for the reaction
H₂ + I₂ → 2HI
K =[tex]\frac{HI^{2} }{[H_{2][I_{2}] } }[/tex]
K=44.8 and [HI]=0.50M
[H₂] = [tex]\frac{[HI]^{2} }{K}[/tex]
[H₂] =[tex]\frac{(0.50M)^{2} }{44.8}[/tex]
[H₂] ≈0.0056M
equilibrium concentration of hydrogen is 0.0056M sa per the given reaction.
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1
2
3
6
8
g
10
Which two pieces of fossil evidence support the idea of continental drift?
bacteria and petrified wood
O Glossopteris and bacteria
O Lystrosaurus and Glossopteris
O petrified wood and Tyrannosaurus
Lystrosaurus and Glossopteris are two pieces of fossil evidence support the idea of continental drift.
One of the geologist's first theories about how continents moved over time was continental drift. The science of plate tectonics has been largely supplanted the hypothesis of the continental drift. Alfred Wegener has been most closely associated with the continental drift idea. Wegener released a paper in the early twentieth century describing his notion that continental landmasses were "drifting" across the Earth, occasionally ploughing through seas and into one other. He developed the term "continental drift" to describe this process.
Wegener found similarities in the coasts of eastern South America as western Africa and hypothesised that those countries had originally been part of a supercontinent called Pangaea, which had separated and travelled many kilometres away over geologic time. He also mentioned nearly comparable fossil creatures and rock layers that happened on vastly different continents. Colbert discovered Lystrosaurus fossils in the Transantarctic Mountains of Antarctica. Such fossils belonged to something like a species previously discovered in Africa, proving that the world's two most distant continents were formerly linked.
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Answer: C. Lystrosaurus and Glossopteris
Explanation:
When heated, calcium carbonate forms calcium oxide and carbon
dioxide.
The equation for the reaction is:
CaCO3 + CaO + CO2
The relative atomic masses are Ar Ca = 40, C = 12,0 = 16
A student heated 25 g of calcium carbonate.
What mass of carbon dioxide was produced?
I
Mass of carbon dioxide =
(4 marks)
When calcium carbonate is heated, it breaks down into the components calcium oxide and carbon dioxide.
What do you mean by calcium carbonate?
Calcium carbonate is a chemical compound that has the formula CaCO3. It is a common mineral found in rocks as calcite and aragonite, and it is the main component of pearls and the shells of marine organisms, snails, and eggs. Calcium carbonate is a component of agricultural lime that is formed when calcium ions in hard water react with carbonate ions to form limescale. It's commonly used in medicine as a calcium supplement or an antacid, but too much of it can be dangerous.
25 g of calcium carbonate contains 25/100 x (40 + 12 + 3 x 16) = 25/100 x 88 = 22 g of calcium and 12 g of carbon.
Hence, mass of carbon dioxide produced is 12 g.
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PLS HELP ME WITH QUESTION 5 I NEED HELP ASAP
Answer:
30.5%
Explanation:
There are 4 wavelengths that are emitted from a Hydrogen atom that can be seen by the human eye. Two of the wavelengths are the same color. What colors are they
Answer:
a) red, blue, and violet
b) orange, yellow, and green
C) red, orange, and yellow
D) blue, indigo, and violet
Chlorine dioxide, ClO2, si a reddish-yellow gas that is soluble in water. In basic solution it gives ClO3- and ClO2- ions. 2ClO2(aq) + 2OH-(aq) ?
ClO3-(aq) + ClO2- (aq) + H2O. To obtain the rate law for this reaction, the following experiments were run and, for each, the initial rate of the reaction of ClO2 as determined. Obtain the rate law and the value of the rate constant
Chlorine dioxide is a powerful oxidizing agent and disinfectant used to sanitize and disinfect water, air, surfaces, and medical equipment.
What is Chlorine?
Chlorine is a chemical element found in the halogen group on the periodic table. It has the atomic symbol Cl, and its atomic number is 17. Chlorine is a pale green gas at room temperature, and it is highly reactive. Chlorine is widely used in water treatment and in the production of cleaning products, plastics, and pesticides.
The rate law for this reaction is rate = k[ClO2][OH-], where k is the rate constant. To calculate the rate constant, we can use the following equation:
k = (rate2 - rate1)/([ClO2]2 - [ClO2]1)([OH-]2 - [OH-]1)
Substituting the values for experiments 1 and 2, we get:
k = (0.00276 - 0.0248)/((0.020 - 0.060)(0.030 - 0.030)) = -0.142
The value of the rate constant is k = -0.142 mol/((L s)mol2).
To calculate the initial rate of reaction in experiment 4, we can use the following equation:
rate = k[ClO2][OH-]
Substituting the values for experiment 4, we get:
rate = -0.142(0.040)(0.060) = -0.0043 (mol/((L s))
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6.0 mol Al reacts with 4.0 mol O2 to
form Al2O3.
4AI + 302 → 2Al2O3
How many moles of Al2O3 form when
4.0 mol O2 reacts?
[?] mol Al2O3
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.66 mole of Al[tex]_2[/tex]O[tex]_3[/tex] form when 4.0 mol O[tex]_2[/tex] reacts.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
4AI + 3O[tex]_2[/tex]→ 2Al[tex]_2[/tex]O[tex]_3[/tex]
moles of Al =6.0 mol
moles of O[tex]_2[/tex]=4.0 mol
Since oxygen is limiting reagent
moles of Al[tex]_2[/tex]O[tex]_3[/tex]=2/3×4.0
=2.66 mole
Therefore, 2.66 mole of Al[tex]_2[/tex]O[tex]_3[/tex] form when 4.0 mol O[tex]_2[/tex] reacts.
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A sample of an unknown gas at STP has a density of 0.630 grams per liter. What is the gram molecular mass of this gas?
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, 0.630 is the gram molecular mass of this gas.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the gas ÷volume marked on the graduated cylinder
density= 0.630 grams per liter
means 0.630 grams of an unknown gas is present in 1 liter of solution
Therefore, 0.630 is the gram molecular mass of this gas.
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The hybridization of orbitals on the central atom in a molecule is sp. The electron-domain geometry around this central atom is ________.
A molecule's core atom experiences sp orbital hybridization. Around this primary atom, the geometry of the electron domain is linear.
In chemistry, hybridization is the idea of combining two atomic orbitals to create a new class of hybridized orbitals. Usually, this mixing creates hybrid orbitals with completely distinct energies, forms, etc. In hybridization, the same energy-level atomic orbitals are primarily involved. However, assuming they contain equal energy, both fully-filled and half-filled orbitals can participate in this process.
When two atomic orbitals unite to generate a hybrid orbital in a molecule, the energy of the orbitals of the individual atoms is redistributed to give orbitals of equivalent energy. Hybridization is the name given to this process. Atomic orbitals with similar points are brought together during the hybridization process.
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How would you name this organic compound?
I found a couple ways to name it but I don't know which one's correct.
Consider a fusion reaction in which a proton fuses with a neutron to form a deuterium nucleus. How much energy is released in this reaction?(The mass of the deuterium nucleus is 2.01355u).
Energy released in the reaction in which a proton fuses with a neutron to form a deuterium nucleus is calculated as 2.234 MeV.
What do you understand by a fusion reaction?In fusion reaction, two light nuclei merge to form single heavier nucleus. The process releases energy because total mass of the resulting single nucleus is less than the mass of two original nuclei. And the leftover mass becomes energy.
form a deuterium nucleus: 1^1H+0^1n⟶1^2H+γ The masses are 1^1H(1.0078u) 0^1n(1.0087u) and 1^2H(2.0141u) the γ -ray photon is massless.
Δm= 1.0078 +1.0087- 2.0141
Energy released = 2.4*10^-3 * 931 MeV
= 2.234 MeV
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Which of the following sets contains elements that will form ions with a charge of 2-? a. As, P, and N b. Te, S, and c. Si, P, and S d. Sr, Ca, and Be
Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).
An element is what?An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.
What do you mean by nature elements?Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.
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Why does the arrangement of the particles affect the properties of the substance?
The arrangement of the particles in a substance affects its properties because the arrangement of the particles determines the interactions between the particles.
The arrangement of the particles affects the properties of a substance because the interactions between the particles determine the overall characteristics of the substance.
For example, if the particles in a substance are arranged in an orderly, crystalline structure, the inter-particle forces are strong, making the material harder and more rigid. On the other hand, if the particles are arranged in a disordered, amorphous structure, the inter-particle forces are weaker, making the material softer and more malleable.
The arrangement of the particles also affects the physical and chemical properties of the substance. If the particles are arranged in a crystalline structure, the substance will have a higher melting point, boiling point, and hardness than if the particles were arranged in an amorphous structure.
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