Taking into account definition of percent yield, the percent yield of the reaction is 62.78%.
Reaction stoichiometryIn first place, the balanced reaction is:
SiO₂(s) + 3 C(s) = SiC(s) + 2 CO(g)
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
SiO₂: 1 moleC: 3 molesSiC: 1 mole CO: 2 molesThe molar mass of the compounds is:
SiO₂: 44 g/moleC: 12 g/moleSiC: 40 g/moleCO: 28 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
SiO₂: 1 moles ×44 g/mole= 44 gramsC: 3 moles ×12 g/mole= 36 gramsSiC: 1 mole ×40 g/mole= 40 gramsCO: 2 moles ×28 g/mole= 56 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 44 grams of SiO₂ reacts with 36 grams of C, 50 grams of SiO₂ reacts with how much mass of C?
mass of C= (50 grams of SiO₂×36 grams of C)÷ 44 grams of SiO₂
mass of C= 40.91 grams
But 40.91 grams of C are not available, 40 grams are available. Since you have less mass than you need to react with 50 grams of SiO₂, C will be the limiting reagent.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)× 100%
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Theoretical mass of SiCConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 36 grams of C form 40 grams of SiC, 40 grams of C form how much mass of SiC?
mass of SiC= (40 grams of C×40 grams of SiC) ÷36 grams of C
mass of SiC= 44.44 grams
The theoretical yield of SiC is 44.44 grams.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 27.9 gramstheorical yield= 44.44 gramsReplacing in the definition of percent yield:
percent yield= (27.9 grams÷ 44.44 grams)× 100%
Solving:
percent yield= 62.78%
Finally, the percent yield is 62.78%.
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In a lewis structure involving bromine and chlorine, if a central bromine atom has two lone pairs, how many chlorine atoms must be present?.
Learn Lewis dot structure and lone pair.
What is lewis structure?
The valence shell electrons of a molecule are depicted in a highly condensed manner in a Lewis structure. It serves as a visual representation of the electron arrangements around specific atoms in molecules. Electrons are represented as "dots" or "lines" when two atoms are bonded together.
What is lone pair?
Valence electron pairs known as lone pairs are those that are exclusive to one atom. They are not involved in the synthesis of covalent bonds. An example is the two lone pairs on the oxygen atom in the water molecule. Another illustration is the lone pair on the nitrogen atom of the ammonia molecule.
Four of the seven valence electrons in bromine are occupied if there are two lone pairs. Thus, three chlorine atoms can form covalent connections with the remaining three.
Therefore, three chlorine atoms can form covalent connections with the remaining three.
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a rigid 5 l vessel contains 2 mols of helium and 3 mols of hydrogen at a pressure of 10 atm. maintaining a constant temperatuture an additional 3 mols of hydrogen are added. what is the partial pressure of hydrogen gas in the vessel at the end?
The partial pressure of hydrogen gas in the vessel at the end is 12 atm
How do I determine the partial pressure of hydrogen gas?We'll begin by obtaing the new pressure of the vessel. This can be obtained as follow:
Initial pressure (P₁) = 10 atmInitial mole (n₁) = 2 + 3 = 5 molesNew mole (n₂) = 5 + 3 = 8 molesNew pressure (P₂) =?PV = nRT
Divide both sides by V
P = nRT / V
Divide both sides by n
P / n = RT / V
RT / V => Constant
P₁ / n₁ = P₂ / n₂
10 / 5 = P₂ / 8
2 = P₂ / 8
Cross multiply
P₂ = 2 × 8
P₂ = 16 atm
Thus, the new pressure is 16 atm
Next, we shall determine the mole fraction of hydrogen gas. This is shown below:
Mole of Helium = 2 moles Mole of hydrogen gas = 3 + 3 = 6 molesTotal mole = 2 + 6 = 8 molesMole fraction of hydrogen gas =?Mole fraction = Mole of element / total mole
Mole fraction of hydrogen gas = 6 / 18
Mole fraction of hydrogen gas = 0.75
Finally, we shall determine the partial pressure of the hydrogen gas. This can be obtained as follow:
Mole fraction of hydrogen gas = 0.75Total pressure = 16 atmPartial pressure of hydrogen gas =?Partial pressure = mole fraction of element × total pressure
Partial pressure of hydrogen gas = 0.75 × 16
Partial pressure of hydrogen gas = 12 atm
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why is it necessary to exclude water in each stage of the production of a product with the grignard reaction. be specific. give a chemical equation to illlustrate
The water reacts with the Grignard reagent and destroys it. So it is necessary to exclude water in each stage of the production of a product with the Grignard reaction.
Consequently, water ought to be excluded from the reaction as plenty as possible i.e. by means of the usage of anhydrous solvents, etc. c. The addition of hydrochloric acid is essential to quench the leftover Grignard reagent and to transform the magnesium alcoholate into the alcohol.
Water or alcohols could protonate and for that reason destroy the Grignard reagent, due to the fact the Grignard carbon is tremendously nucleophilic. this would form a hydrocarbon.
Grignard reagents react swiftly with acidic hydrogen atoms in molecules consisting of alcohol and water. whilst a Grignard reagent reacts with water, a proton replaces the halogen, and the product is an alkane. The Grignard reagent, therefore, affords a pathway for converting a haloalkane to an alkane in steps.
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If the partial pressure of a gas over a solution is doubled, how has the concentration of gas in the solution changed after equilibrium is restored?.
The concentration of the gas in the solution will double.
What is Henry's law?
Henry's law, a gas law, states that, when the temperature is held constant, the volume of fuel that is dissolved inside a liquid seems to be directly proportional to the fraction of the that gas above the liquid. Henry's law constant (often abbreviated as "kH") is the proportionality constant for this relationship.
According to Henry's law, the solubility of any gas is directly related to its partial pressure, so if we change the partial pressure, the concentration will change as well.
Given that the partial pressure is doubled in this case, the concentration will also double.
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When preparing a solution in a cuvette, make sure to handle the cuvette by the __________ and avoid touching the ____________ then, ____________ the cuvette before placing it in the spectrophotometer.
Answer: Textured sides, smooth sides, wipe down.
Describe where metals come from, and give one example of how metals are used based on their physical properties.
Answer:
Metals are extracted form ores found in the earth's crust. An ore is a rock containing enough metal or a metal compound to make extracting it worthwhile. An example of its use in everyday life are plumbing pipes made of copper used in electrical wiring and heating systems. Copper is a good conductor of heat and electricity and is immune to corrosion.
Why does the developing chamber need to be prepared before adding the tlc plate?.
The developing chamber needs to be prepared because the solutions of the solute and solvent to dissolved.
What is a TLC plate?
TLC Plate Buying Guide Thin-layer chromatography (TLC), a standard analytical method for separating and identifying the chemicals in a given mixture, can also be used to assess the purity of a specific component included within that mixture. Gypsum and 60 G TLC Silica Gel Plates
What is the chamber process?
The Chamber technique, also known as the "lead-chamber process," is an industrial method for manufacturing sulfuric acid by oxidizing sulfur dioxide with moist air and employing gaseous nitrogen oxides as catalysts. The reaction is generally carried out in several sizable, box-like chambers made of sheet lead.
Simply replacing the watch glass with aluminum foil and getting the developing chamber ready before adding the TLC plates gives the solvent time to saturate, producing quicker and more repeatable results.
Therefore, the TLC plates gives the solvent time to saturate, producing quicker and more repeatable results.
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Consider two 5 l chambers. In one, there are 5. 00 g o₂, and in the other there are 5. 00 g he. Which has the higher pressure at room temperature?.
The gas having higher pressure at room temperature, is P = 6.11 atm.
What is the ideal gas law?
The general gas equation, often known as the ideal gas law, is the equation of state for a hypothetical ideal gas. It has a number of limitations, but it provides a decent approximation of the behavior of numerous gases under various circumstances.
According to the ideal gas equation,
PV =nRT
For O₂,
Number of moles of oxygen gas = 5.00 g /32 g/mol = 0.156 moles
P =?
V = 5 L
n = 0.156 moles
T = 25 + 273 = 298 K
R = 0.082 atmLK-1mol-1
P = nRT/V
P = 0.156 moles × 0.082 atmLK-1mol-1 × 298 K/5 L
P = 0.76 atm
For He,
Number of moles of He = 5/4 g/mol = 1.25 moles
P =?
V = 5 L
n = 1.25 moles
T = 25 + 273 = 298 K
R = 0.082 atmLK-1mol-1
P = nRT/V
P =1.25 moles × 0.082 atmLK-1mol-1 × 298 K/5 L
P = 6.11 atm
Hence the gas having higher pressure at room temperature is He.
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Write the ground-state electron configuration for calcium, ca. You may write either the full or condensed electron configuration.
The ground-state electron configuration for calcium, ca is : 1s²2s²2p^6 3s²3p^6 4s².
What is electron configuration?In atomic physics and quantum chemistry, the electron configuration is described as the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
The four different types of orbitals (s,p,d, and f) have different shapes, and one orbital can hold a maximum of two electrons. The p, d, and f orbitals have different sublevels, thus can hold more electrons. The electron configuration of each element is specific and unique to whatever position on the periodic table.
In conclusion, calcium electron configuration is shown below as : 1s²2s²2p^6 3s²3p^6 4s².
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Two students are planning to carry out an experiment to infer the strength of intermolecular forces. Which test would not support the students' investigation?.
Two students are inferring the strength of intermolecular forces. The test which would not support their investigation is: measuring the mass of each substance.
What are the intermolecular forces?The intermolecular forces are the secondary force that mediates the interaction between molecules that affects the state of matter. Since the intermolecular forces have a significant role in the physical characteristics of a substance, this force could be investigated by doing these activities:
Compare the viscosity of each substance.Compare the state of matter at room temperature.Determine the melting point of each substance.Determine the boiling point of each substance.Learn more about the intermolecular forces here https://brainly.com/question/29317616
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In lab we applied the conservation of energy to a system to allow us to equate the initial energy to the final energy. How does the initial energy become stored in the system?.
In lab we applied the conservation of energy to a system to allow us to equate the initial energy to the final energy. Here the initial energy become stored in the system. It is due the reason that:
The force of gravity does work on the mass when it is displaced some height when the pendulum is displaced by some angle theta.
Work done by the gravitational force is W = mgh , it is known as potential energy of the body.
When, body displaced some height then work done by the gravitational force store as energy in the system.
So, the force of gravity does work on the mass, when it is displaced some height .
What do you mean by force of gravity ?
“Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.”
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the titrations being done in this experiment are acid/base titrations. either an acid is serving as a titrant and the analyte is a base or the base is serving as a titrant and the analyte is an acid. because the analyte is a buffer (a mixture of a weak acid or base and its conjugate) the reaction with the titrant might be difficult to identify. when the acetic acid / sodium acetate buffer is titrated with naoh, what is the chemical reaction with the titrant? [ select ] ch3cooh -oh ch3coo- h2o ch3cooh -oh ch3coo- h2o ch3cooh ch3coo- ch3coo- ch3cooh ch3coo- h3o ch3cooh h2o ch3coo- na ch3coo-na when the ammonia / ammonium chloride buffer is titrated with hcl, what is the chemical with the titrant? [ select ] nh3 h2o nh4 -oh nh4 -oh nh3 h2o nh4 -oh nh4oh nh3 h3o nh4 h2o nh3 -oh no reaction
A buffer is a solution which can resist a change in the pH on addition of a small amount of an acid or a base.
Case 1: There is an acidic buffer containing a weak acid CH3COOH and salt of its conjugate base CH3COONa.
Explanation of how a buffer works:
The following reaction would take place:
HCl + CH3COONa + CH3COOH + NaCl
If a small amount of bases added, then CH3COOH acts as a buffering agent and the following reaction would take place:
NaOH+ CH3COOH + CH3COONa + H2O
Hence, when the acetic acid/sodium acetate buffer is titrated with NaOH, The buffering agent is CH3COOH and reaction(1) will occur.
CH3COOH + -OH ⟶ CH3COO + H2O
Case 2: There is an basic buffer containing a weak base NH4OH and salt of its conjugate acid NH4OH.
The following reaction would take place:
HCl + NH4OH+ = NH4Cl + H2O
NaOH(aq) + NH4Cl(aq) 1 NH4OH(aq) + H2O(
When the ammonium chloride buffer is titrated with HCl reaction will occur.
NH3(aq) + H3O+(aq) ⟶ NH4+(aq) + H2O
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Question 4 (1 point)
How many oxygens are present on the reactants side of this equation?
KCIO3 --> KCI + O₂
01
5
3
2
Answer
no
Explanation:
magnesium hydroxide has a strong laxative effect, whereas aluminum hydroxide has a constipating action.
Magnesium hydroxide lessens the amount of acid in the stomach and increases the amount of water in the intestines, which may cause bowel movements.
Children and adults who experience periodic constipation can be treated temporarily with magnesium hydroxide. Saline laxatives, which include magnesium hydroxide, are a group of medicines. It works by inducing the retain water. Constipation may persist if this medicine is used excessively or for an extended period of time, leading to dependence on laxatives. Dehydration, persistent diarrhea, and mineral imbalances may also be brought on by excessive use. Tell your doctor if your symptoms continue or get worse. An over-the-counter medication called "Milk of Magnesia," or magnesium hydroxide, is used to treat upset stomach, occasional constipation, and heartburn. It is not meant for ongoing use. For this medicine , there are liquid and chewable forms of the medication. regulating mood and reducing stress.
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is air important for burning with scientific methods
chemoheterotrophs multiple choice use sunlight as an energy source. use pre-formed organic molecules as a carbon source. use pre-formed organic molecules as an energy source. use inorganic chemicals as an energy source.
Chemoheterotrophs use pre-formed organic molecules as a carbon source.
They are those microbes who get their carbon and energy source from organic sources.
All animals are chemoheterotrophs even the bacteria that live inside humans. By breaking down the food they get their energy and building materials to grow their body.
Chemoheterotrophs plays a very vital role in ecosystem. All herbivores, carnivores, scavengers, decomposers are chemoheterotrophs.
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Given the data in the table, what is the average atomic mass of chlorine? chlorine-35 chlorine-37 atomic mass 34. 969 amu 36. 966 amu r dative abundance 75. 78 percent 24. 22 percent a. 34. 969 amu b. 35. 453 amu c. 35. 9675 amu d. 36. 966 amu.
According to the periodic table, chlorine has an average atomic mass of 35.453 amu.
Considering that the average atomic mass of chlorine is 35.45 AMU, what is the abundance of Cl-35 and Cl-37?Chlorine has an average atomic mass of 35.45 amu. Percent abundance for x therefore equals 77.5% and (1 - x) equals 0.225, or 22.5%. Chlorine-35 isotope abundance is 77.5%, whereas Chlorine-37 isotope abundance is 22.5%.
Mass spectrometry can be used to demonstrate that the ratio of naturally occurring chlorine isotope 35 to isotope 37 is 3 to 1.
A chlorine-35 atom has 18 neutrons in its nucleus (17 protons plus 18 neutrons), whereas a chlorine-37 atom has 20 neutrons (17 protons plus 20 neutrons = 37 particles in the nucleus). Isotopes of a substance are produced by adding or deleting neutrons from an atom's nucleus.
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The total mass of the system before the reaction and the total mass of the system after the reaction should be the same. Explain why this is the case in terms of what happens to atoms in a chemical reaction.
Answer:
The law of conservation of mass states that mass can not be created nor destroyed. This law applies to chemical reactions as the mass of the atoms stays the same, even after the reaction.
Identify the effect of each error during a thin layer chromatography experiment.
1. The mobile phase used does not move any of the spots at all.
a. There can be no separation of components
b. Accurate Rf values cannot be determined
c. There will be smears on the TLC plate
2. Pen rather than pencil is used to draw the lines on the plate.
a. There can be no separation of components
b. Accurate Rf values cannot be determined
c. There will be smears on the TLC plate
3. The solvent line is not marked after the TLC plate is removed from the chamber.
a. There can be no separation of components
b. Accurate Rf values cannot be determined
c. There will be smears on the TLC plate
4. The TLC plate remains in the chamber even after the solvent has reached the top of the plate.
a. There can be no separation of components
b. Accurate Rf values cannot be determined
c. There will be smears on the TLC plate
1. The mobile phase used does not move any of the spots at all.
The answer is;
a. There can be no separation of components
2. Pen rather than a pencil is used to draw the lines on the plate.
c. There will be smears on the TLC plate
3. The solvent line is not marked after the TLC plate is removed from the chamber.
b. Accurate Rf values cannot be determined
4. The TLC plate remains in the chamber even after the solvent has reached the top of the plate.
b. Accurate Rf values cannot be determined
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Sharon reads two different articles about avocados. The first article, in a weight-loss magazine, claims that avocados
are unhealthy because they are high in fat. The second article, in an annual publication from a doctors' group,
that the fat in avocados is a type that IS good for the heart.
claims
To assess these claims, which question might Sharon ask?
O Which source do avocados come from?
O Where
are avocados soid?
O Is the source an authority on the subject?
• How much do avocados cost?
Answer:which source do avocados come from?
Explanation:
This could be the answer because finding out what source it is would be able to figure out the claims of both the articles
Bomb calorimetry is best for determining heat values. Because we cannot have a bomb calorimeter for every pair of students, we use what is readily avaliable. Why would two styrofoam cups be an economical way of determining these heat values and what is the of the major pitfalls of using this system?.
Styrofoam cups have more capacity to absorb heat in higher rate and it is economically cheap. However, it never reaches the reaction's full temperature before you stop taking readings.
What is bomb calorimeter?A bomb calorimeter is used to determine the heat energy absorbed or released in a reaction.The reaction mixture and the calorimeter both heat up.
Since more of the reaction's heat was used to warm the calorimeter than the reaction mixture, a calorimeter that absorbs a lot of energy will have a significantly lower final temperature.
The calorimeter constant is a quantity that depends on the composition and mass of the calorimeter. Steel and styrofoam both absorb heat at a higher rate per gram, although the steel calorimeter is likely heavier.
Fast reactions come with the further disadvantage that the styrofoam calorimeter almost certainly never reaches the reaction's full temperature before you stop taking readings. As a result, there is a little source of heat that is lost from the metal calorimeter.
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two flasks at the same temperature are joined by a glass tube with a stopcock. flask a is a 4.0 l flask containing n2 at 2.0 atm, while flask b is a 10.0 l flask containing co at 1.4 atm. what is the final pressure in the flasks after the stopcock is opened?
Final pressure in the flasks containing N2 and Co after the stopcock is opened is 1.57 atm
mole in flask A
Volume (V) = 4L
Pressure (P) = 2atm
Temperature (T) = STP = 273K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
n = PV/RT
n = (2 × 4) / (0.0821 × 273)
n = 0.357 mole
mole in flask B
Volume (V) = 10L
Pressure (P) = 1.4atm
Temperature (T) = STP = 273K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
n = PV/RT
n = (1.4 × 10) / (0.0821 × 273)
n = 0.625 mole
determining the final pressure
Total volume (V) = 4 + 10 = 14 L
Total mole (n) = 0.357 + 0.625 = 0.982
Temperature (T) = STP = 273 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
P = nRT/V
P = (0.982 × 0.0821 x 273) / 14
P = 1.57 atm
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the entropy of the ideal gas, per molecule, as a function of temperature and pressure, is given by the formula: kb [ (5/2)ln(t/t0) - ln(p/p0) ], where t0 and p0 are temperature and pressure of a reference state. this formula can be easily derived from the formula we derive in class for the entropy as a function of volume and temperature, and the equation of state for the ideal gas, pv
The equation for the entropy of the ideal gas, per molecule, as a function of temperature and pressure reads: 3.138 J mol-1 k-1. t0 and p0, where kb is [(5/2)ln(t/t0) - ln(p/p0)].
entropy is a thermodynamic quantity that measures the degree of disorder or randomness in a system by measuring the thermal energy that cannot be converted into mechanical work in that system. A state of disorder, randomness, or uncertainty is most frequently associated with the scientific concept of entropy.
The force perpendicular to an object's surface that is applied per unit area over that force is known as pressure . The gauge pressure, also known as gauge pressure, is the pressure in relation to the surrounding atmosphere.
S = Ssatp - Satp
= NaRb ( 5/2 ln(273/273.15) - ln (101/ 100))
= 1.713 J mol^-1 k^-1 for three molcules
= 1.713 *3 = 3.138 J mol^-1 k^-1
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which of the following does not describe a metal? question 24 options: a) good conductor of electricity b) good conductor of heat c) found on the left side of the periodic table d) tends to gain electrons e) forms ionic compounds with nonmetals
Metals are located in the left side of periodic table. They are good conductors of heat and electricity. Metals form ionic compounds by losing electrons and not by gain of electrons. Thus, option d does not describe a metal.
What are metals?Metals are electropositive elements located in the left side of periodic table. They are electrons rich and easily lose electrons through chemical bonding.
Metals forms ionic compounds with non-metals through losing electrons to the non-metals. Non-metals are mostly electronegative and are placed in the right side of periodic table.
Non-metals are electron - deficient and they need to gain electrons through chemical bonding to attain stability. Therefore, option d describes a non-metal and not a metal.
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Write the formulae of the acid and base of ZnS.
ZnS is the chemical formula of the zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.
What is acid ?A Bronsted - Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or establish a covalent bond with an electron pair. Proton donors, also known as Bronsted - Lowry acids, are the first class of acids.
Any hydrogen containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.
Thus, ZnS is the chemical formula of the zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.
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PLEASE HELP!!!
Draw arrows to show the direction that atoms move from one atom to another and put in the charge on each atom that creates the attraction that holds the atoms together in a compound
The transfer of charges that leads to the formation of the ionic bond in magnesium oxide is shown in the image attached.
What is the ionic bond?The term ionic bond has to do with the bond that could be formed when two atoms come together usually a metal and a nonmetal. In this case, one atom would have to loose electrons and another atom would have to gain the electrons. The atom that looses the electrons is the metal while the atom that gains the electron is the non metal.
From my description, one can make bold to say that the ionic bond just leads to the formation of a compound that is largely an ion pair. The number of electrons that is lost or gained in the formation of the compound is largely in keeping with the formula unit of the compound.
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Unknown element X forms an ion with a plus 2 charge (X2+). Unknown element Z forms an ion with a negative 3 charge Z3-). What is the formula for the ionic compound formed when X bonds with Z?
X[tex]Z^{-}[/tex] is the formula for the ionic compound formed when X bonds with Z
What is a ionic compound ?A chemical compound known as an ionic compound is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite of having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.
What is a formula?A formula, such as a mathematical formula or a chemical formula, is a brief manner of symbolically representing information.
The exchange of one or more electrons between atoms results in the formation of ionic bonds between two or more atoms. Positive ions called cations and negative ions called anions are created during electron transfer.
Hence, X[tex]Z^{-}[/tex] is the formula for the ionic compound formed when X bonds with Z
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Formative Assessment 1:
Identify the P.E.N (Proton, Electron, and Neutron) number of the following elements:
Sodium (Na)
Chlorine (Ag)
Magnesium (Mg)
Oxygen (O)
Answer:
p-e-n
1- Na=11-11-12
2-Cl=17-17-29
3-Mg=12-12-12
4-O=8-8-8
Explanation:
chlorine is Cl
The PEN value for sodium, chlorine, magnesium, and oxygen is (11,11,12),(17,17,18),(12,12,12), (8,8,8) respectively
The atomic number(Z) is equal to the number of protons to equal to number of electrons.
The number of neutrons is equal to atomic mass minus the atomic number
n=A-Z
For Na, Z=11, p=e=11
The number of neutrons is 23-11=12
For Cl, Z=17, e=17
The number of neutrons is A-Z=35-17=18
For magnesium, Z=12, A=24
The number of neutrons is 24-12=12
For O, Z=8, p=e=8
The number of neutrons is 16-8=8
The atomic number is the basis of the periodic table.It is equal to the number of protons.The number of neutrons is atomic mass minus atomic number.To learn more about atomic number visit:
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does thermal conductivity of a substance affect its ability to heat or be heated by its surroundings (science)
The thermal conductivity of a substance affects its ability to heat or be heated by its surroundings because the higher the thermal conductivity of a substance, the more easily it can be heated or heat others.
What is the thermal conductivity of a substance?Thermal conductivity of a substance refers to the ability of a substance to allow heat energy to easily flow through it.
The higher the thermal conductivity of a substance, the more easily it can be heated or heat its surroundings.
The thermal conductivity of a substance varies according to the nature of the substance. Metals generally have high thermal conductivities whereas non-metals usually have low thermal conductivity.
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we derive in class that the heat capacity at constant volume of an ideal monatomic gas is (3/2)kb per particle. what is the heat capacity at constant volume of 5 moles of an ideal monatomic gas is (in si units)? you have to be careful not to confuse between the heat capacity per mole, which has units j/mole/k, and the heat capacity of a sample of given size. if the amount of the material (i.e. sample size) is know, your answer for the heat capacity of the sample should be in j/k.
The heat capacity of the sample should be is 62.358J/K.
Calculation:-
Heat Capacity of 5 mole
5 x ( [tex]\frac{3}{2}[/tex] Kв x NA )
= 5 x ( [tex]\frac{3}{2}[/tex] R)
[tex]\frac{15}{2} R[/tex]
= [tex]\frac{15}{2}[/tex] x 8.3144
= 62.358J/K
Heat capacity is defined as the amount of heat energy required to raise the temperature of a given amount of matter by 1 degree Celsius. The heat capacity of a particular substance is a broad property as it depends on its size or quantity. The unit of heat capacity is Joule/Kelvin or Joule/Celsius.
Heat capacity or specific heat is the amount of heat required per unit mass to raise the temperature by 1°C. Specific heat capacity helps determine the processing temperature and amount of heat required for processing and helps distinguish between two polymer composites. The heat capacity of a substance is defined as the amount of thermal energy produced or released when the temperature of a unit mass of the substance changes by 1 °C.
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