Atomic number is the number of protons in an atom with the symbol Z.
The periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
In a neutral atom, the number of protons is equal to the number of electrons in the atom. However, the number of neutrons can be derived by subtracting the neutron number from the atomic mass.
Hence, the number of protons, electrons and neutrons of phosphorus are as illustrated above.
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a sample of hydrocarbon produced 3.14 grams of co2 and 1.28 grams of h2o during combustion analysis. if the hydrocarbon has a molar mass between 50 and 60 g/mol, what is its molecular formula?
The molecular formula is C4H8 of a hydrocarbon has a molar mass between 50 and 60 g/mol.
Mass of CO2 = 3.14 grams
Mass of H2O = 1.28 grams
Molar mass = 50 g/mol
Molar mass C = 12.01 g/mol
Molar mass H = 1.01 g/mol
Molar mass O = 16.0 g/mol
Step 2: Calculate moles CO2
Moles = mass / molar mass
Moles CO2 = 9.603 grams / 44.01 g/mol
Moles CO2 = 0.218 moles
Step 3: Calculate moles C
For 1 mol CO2 we have 1 mol C
For 0.218 moles CO2 we have 0.218 moles C
Step 4: Calculate mass C
Mass C = 0.218 moles * 12.01 g/mol
Mass C = 2.618 grams
Step 5: Calculate moles H2O
Moles H2O = 1.573 grams / 18.02 g/mol
Moles H2O = 0.0873 moles
Step 6: Calculate moles H
For 1 mol H2O we have 2 moles H
For 0.0873 moles H2O we have 2* 0.0873 = 0.1746 moles
Step 7: Calculate mass H
Mass H = 0.1746 moles * 1.01 g/mol
Mass H = 0.176 grams
Step 8: Calculate mol ratio
We divide by the smallest amount of moles
C: 0.218 moles / 0.1746 moles = 1.25
H: 0.1746 moles / 0.1746 moles = 1
The molecular formula is C4H8.
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Mark scheme
Remember how we work out relative formula mass: Mr = Sum of (Ar of element x number
of atoms in element)
Multiply the number of atoms in each element by the element's relative atomic mass and
add these up:
Mr (1 x 23) + (1 x 23) + (1x 16)
Work out the answer: Mr = 23 + 23 + 16
V
Mr= 62
Feedback?
The given relative mass formula is correct. The weight in grams of the number of atoms of an element contained in 12.00 g of carbon-12 is known as the relative atomic mass of the element.
What is mass relative to?The ratio of an element's average atomic mass to the unified atomic mass unit is the relative atomic mass, or Ar. The average mass of an element's isotopes is used to calculate the relative atomic mass.
What exactly are absolute and relative masses?Absolute mass is the total mass of all protons and neutrons, whereas relative mass is the average atomic mass of all the isotopes present in a given percentage. As an illustration, the average atomic mass of carbon, calculated using the proportions of the isotopes C-12, C-13, and C-14, is 12.01 while the absolute mass of carbon is 12.0 amu.
What is the atomic mass equation?An element's mass number is determined by the sum of its proton and neutron counts: Protons and neutrons together make up mass.
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if a container weighs exactly 10 grams, how would this mass show up on an analytical balance in grams?
If a container weighs exactly 10 grams, this mass show up on an analytical balance in 10.0000 grams.
The accuracy of measurement done with an analytical balance is more trustworthy when based on significant figures.
What exactly is an analytical balance?A unique kind of weighing scale known as an analytical balance is known for being able to measure very small things' masses down to milligrams. It is made up of a scale and a clear glass case.
Using an analytical balance to calculate the weight will increase the precision of the calculation because it calculates the mass to more precise significant figures.
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Convert 2.55 mol of Al(OH)_3Al(OH)3 to grams
2.55 moles of aluminum hydroxide in grams is 198.9grams.
How to calculate number of moles?The number of moles can be converted to mass using the following expression:
mass = number of moles × molar mass
According to this question, 2.55 moles are present in aluminium hydroxide. It can be converted to mass as follows:
Molar mass of aluminum hydroxide = 78g/mol
Mass = 78g/mol × 2.55 mol
mass = 198.9grams
Hence, 198.9grams is the mass present in 2.55 moles of aluminum hydroxide.
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if this atom of aluminum has 10 electrons and 14 neutrons, what value should x be in the chemical symbol?
The value x in the chemical symbol is Aluminium.Aluminum (or aluminium in British English) is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, and ductile metal that is widely used in various industries for its light weight, high strength, and good conductivity properties. Aluminum is the third most abundant element in the Earth's crust, after oxygen and silicon, and is found in many minerals including bauxite.
The chemical symbol for aluminum is "Al". The number of electrons and neutrons in an atom does not determine the chemical symbol for that element. The chemical symbol for an element is based on its atomic number, which is the number of protons in the nucleus of an atom of that element. The atomic number of aluminum is 13, so its chemical symbol is always "Al".
Some common uses of aluminum include the manufacture of transportation vehicles, packaging materials, construction materials, electrical conductors, and consumer goods. It is also used in the aerospace, defense, and high-tech industries due to its high strength-to-weight ratio and good thermal conductivity.
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consider the reaction of c3h8 with o2 to form co2 and h2o. if 3.66 g c3h8 is reacted with excess o2 and 9.31 g of co2 is ultimately isolated, what is the percent yield for the reaction?
The percent yield for the reaction is 84.6%.
To calculate the percent yield for the reaction, we first need to determine the theoretical yield of CO₂ based on the balanced chemical equation for the reaction:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From the equation, we can see that for every mole of C₃H₈ , 3 moles of CO₂ are produced. So, to determine the theoretical yield of CO2, we need to first convert the mass of C₃H₈ to moles and then multiply that by the stoichiometric ratio for CO₂.
The molar mass of C₃H₈ is 44.1 g/mol, so:
3.66 g C₃H₈ / 44.1 g/mol = 0.083 mol C₃H₈
Using the stoichiometry of the reaction, we can now calculate the theoretical yield of CO₂:
0.083 mol C₃H₈ × 3 mol CO₂ / 1 mol C₃H₈ = 0.25 mol CO₂
And the theoretical mass of CO₂:
0.25 mol CO₂ × 44.01 g/mol = 11.0025 g CO₂
Finally, the percent yield of the reaction can be calculated as:
9.31 g CO₂ / 11.0025 g CO₂ × 100% = 84.6%
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An automobile tire has a pressure of 325 kPa when the temperature is 283 K. If the temperature
rises to 323 K and volume is held constant, what is the new pressure?
A tire has a pressure of 325 kPa at 10°C, the new pressure of tire is 285 Pka by using formula P1T1 = P2T2
Initial pressure = 325 kPa
Initial temperature = 10°C
Final temperature = 50°C
As given that the volume is constant.
Now, P1T1 = P2T2
P2 = P1T1 / T2
P2 = 325 kPa x 10 + 273 K / 50 + 273 K
P2 = 285 Pka
Thus, a tire has a pressure of 325 kPa at 10°C, the new pressure of tire is 285 Pka.
What is pressure?
The force applied perpendicularly to an object's surface per unit area across which that force is dispersed is referred to as pressure.Gauge pressure is the measurement of pressure in relation to atmospheric pressure.To know more about pressure, click the link given below:
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how can a change in water temperature impact species in the coral reef?
Answer:
Explanation: When water temperatures rise, or fall, this can irritate, and stress the coral polyps, causing them to lose the algae that lives in the polyp's tissues.
Answer:
Coral reef species may be significantly impacted by a shift in water temperature. Coral bleaching is a condition when the coral expels their symbiotic algae, resulting in a loss of color and perhaps mortality. Sudden temperature fluctuations, especially rises, can induce coral bleaching. The prevalence of illnesses in corals and other reef species can also rise in response to an increase in water temperature. The distribution and behavior of fish and other species might change in response to temperature changes, possibly upsetting the delicate balance of the reef ecosystem. These effects may result in a reduction in the coral reef's biodiversity and general health.
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which of the following is true of carbon? a) it forms only polar molecules. b) it can form a maximum of three covalent bonds with other elements. c) it is highly electronegative. d) it can form both polar and nonpolar bonds
The statement that is true about the carbon is the correct option is d) it can form both polar and nonpolar bonds.
The atomic number of the carbon is 6. The carbon can form the nonpolar covalent bonds when the carbon bonds to itself, like as in graphene and the diamond. The carbon forms the polar covalent bonds with the elements that have the slightly more electronegativity. The example of the polar bon is the carbon and the oxygen bond is the polar covalent bond.
Thus, the carbon can form the polar bond as well it can form the non polar bond.
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Derive the chemical formula of
Tetraoxosilicate iv acid
Answer:
The chemical formula of Tetraoxosilicate(IV) acid is H4SiO4
Which of the following scenarios would INCREASE solubility? Choose all that apply.
Using a mortar and pestle to grind sugar crystals to add to a hummingbird feeder
Stirring sugar into a cup of coffee
Shaking sugar and juice in a tumbler
Heating a cup of tea before adding a spoonful of sugar
Using powdered sugar instead of sugar cubes when mixing icing/frosting for baked goods
Heating a cup of tea before adding a spoonful of sugar would increase solubility. Therefore, the correct option is option D.
What is solubility?Solubility in chemistry refers to a material's capacity to create a solution with that other substance, the solvent. The incapacity of the solute to produce such a solution is referred to as insolubility.
The concentration of a solute inside a saturated solution, where no more solute could be dissolved, is used to determine the extent of a substance's solubility in a certain solvent. The two compounds are considered to be in solubility equilibrium at this moment. Heating a cup of tea before adding a spoonful of sugar would increase solubility.
Therefore, the correct option is option D.
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A girl skateboards with a kinetic energy of 2543.2 j. If the girl and skateboard have a total mass of 110kg, what is her speed?
Answer:
Her speed is 6.8m/s.
Explanation:
K.E= 1/2mv²
or, 2543.2= 1/2×110×v²
or, 2543.2 = 55v²
or, 2543.2/55 = v²
or, 46.24 = v²
or, 6.8² = v²
v = 6.8 m/s
answer
6.8
explanation
k.e=1/2v^2
2543.2=55v^2
46.24=v^2
6.8^2=v^2
v=6.8
write the balanced chemical equation where liquid hexane burns in oxygen gas to form carbon dioxide gas and water vapor. use the smallest whole number coefficients. indicate the states of the reactants and products.
The balanced chemical equation for the combustion of liquid hexane in oxygen gas is: C6H14(l) + 19O2(g) -> 6CO2(g) + 14H2O(g)
In this equation, hexane (C6H14) is a liquid reactant and oxygen gas (O2) is a gaseous reactant. The products, carbon dioxide (CO2) and water vapor (H2O), are both in the gaseous state. To balance the equation, the coefficient 19 was used for the oxygen gas to ensure that the number of oxygen atoms in the reactants and products is equal. Similarly, the coefficients 6 and 14 were used for the carbon dioxide and water vapor, respectively, to balance the number of carbon and hydrogen atoms in the equation.
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the reaction in question 2 is then carried out at the same temperature but the initial pressures were 0.20 atm for h2 and 0.40 atm for s2. calculate the equilibrium concentrations.
At 0.752 atm of H2S and 1073 K, [H2] = 4.94 x 10^-12 mol/L and [S2] = 4.24 x 10^-5 mol/L. At 0.20 atm of H2 and 0.40 atm of S2, [H2] = 1.67 x 10^-12 mol/L and [S2] = 4.68 x 10^-5 mol/L.
The reaction for the decomposition of hydrogen disulfide (HS) is:
2 H2S (g) <=> 2 H2 (g) + S2 (g)
The equilibrium constant (Kc) at 1073 K is 2.0 x 10^-23.
1) At the initial conditions of 0.752 atm of H2S and the temperature of 1073 K, the equilibrium concentrations can be calculated using the equation:
Kc = [H2]^2 / [S2].
Rearranging the equation to solve for [H2], we get:
[H2]^2 = Kc * [S2]
[H2] = sqrt(Kc * [S2])
Since the initial pressure of H2S is 0.752 atm, we can convert it to concentration using the ideal gas law:
P = nRT/V, where n = number of moles, R = gas constant (8.31 J/mol*K), T = temperature (1073 K), and V = volume.
Since n = PV/RT, [H2S] = P/RT.
[H2S] = 0.752 atm / (8.31 J/mol*K * 1073 K) = 8.48 x 10^-5 mol/L.
[S2] = [H2S] / 2 = 4.24 x 10^-5 mol/L.
[H2] = sqrt(2.0 x 10^-23 * 4.24 x 10^-5) = 4.94 x 10^-12 mol/L.
2) At the new initial conditions of 0.20 atm of H2 and 0.40 atm of S2, the new equilibrium concentrations can be calculated using the Kc expression:
Kc = [H2]^2 / [S2].
[H2] = sqrt(Kc * [S2]) = sqrt(2.0 x 10^-23 * (0.40 atm / (8.31 J/molK * 1073 K))) = 1.67 x 10^-12 mol/L.
[S2] = 0.40 atm / (8.31 J/molK * 1073 K) = 4.68 x 10^-5 mol/L.
These are the new equilibrium concentrations at the new initial pressures and temperatures.
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The complete Question is:
Consider the reaction for the decomposition of hydrogen disulfide: 2H2S W=23 H2 = S2t Ko-2. Ax10 at 1073 K. A reaction vessel initially contains 0.752 atm of H2S at 1073K. Find the equilibrium concentrations of H2 and S2. The reaction in question 2 is then carried out at the same temperature but the initial pressures were 0.20 atm for H2 and 0.40 atm for S2. Calculate the equilibrium concentrations.
what mass of sodium chloride (nacl) forms when 7.5 g of sodium carbonate (na2co3) reacts with a dilute solution of hydrochloric acid (hcl)? type in your answer using the correct number of significant figures.
Reaction of 7.5 g of sodium carbonate with a dilute solution of hydrochloric acid (HCl) gives a mass of 8.28 g of NaCl.
1 mole of sodium carbonate yields 2 moles of sodium chloride.
To find grams and volume, we need to calculate the molecular mass of the reactants and products.
So the molecular mass will be:
Na2Co3=106
2 NaCl = 117
160 g Na2Co3 = 117 g NaCl (1)
7.5 g Na2Co3 gives = 'X' g NaCl (2)
Cross-multiplying equations 1 and 2 gives:
X × 106 = 117 × 7.5
X = 8.28
Diploma:
From this we conclude that 7.5 g of sodium carbonate reacts with a dilute solution of hydrochloric acid (HCl) to yield 8.28 g of mass NaCl.
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1. CCC Scale, Proportion, and Quantity According to the
nutrition facts for these potato chips, a serving has 170 mg of
sodium, or 7% of the daily recommended value for an
average adult. Based on this information, how many
milligrams of sodium should an average adult consume in a
day? Show your work.
According to unit conversion, 11.9 mg of sodium should be consumed by an average adult according to the data.
What is unit conversion?
Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
7% of 170 that is 7/100×170=11.9 mg.Thus, 11.9 mg of sodium should be consumed by an average adult according to the data.
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Convert 50.0 g of H2O to mols.
Answer:
approx. 5.0 x10^24 atoms
Explanation:
The molar mass of water is 18.02g/mol
50 grams of water contains 50g x 1 mole/18.02g moles of water
2.775 moles H2O
1 mole of H2O contains 6.022 x 10^23 molecules of water
2.775 moles of H2O contains 2.775 x 6.022 x 10^23 molecules of H2O
= 1.6711 x 10^24 molecules of H2O
1 molecule of H2O contains 3 atoms
Therefore 1.6711 x 10^24 molecules contains 1.6711 x 10^24 x 3 atoms
= approx. 5.0 x10^24 atoms
What is occurring at the anode of the electrochemical cell containing the reaction represented by this equation?
Zn + Cu2+ → Cu + Zn2+
In the given chemical equation, oxidation takes place at anode of the electrochemical cell .
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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the fermentation of glucose c6h12o6 produces ethanol, c2h5oh and co2.the equation for the reaction is as follows: c6h12o6 --> 2c2h5oh 2co2. how many moles of co2 are produced when 0.400 moles of c6h12o6 are used?
0.800 moles of CO2 are produced when 0.400 moles of glucose are used in the fermentation reaction.
The number of moles of CO2 produced when 0.400 moles of glucose (C6H12O6) are used can be calculated from the balanced chemical equation for the reaction. According to the equation, for every 1 mole of glucose that reacts, 2 moles of CO2 are produced:
C6H12O6 -> 2C2H5OH + 2CO2
Therefore, when 0.400 moles of glucose are used, the number of moles of CO2 produced can be calculated as follows:
0.400 moles of glucose * 2 moles of CO2 per 1 mole of glucose = 0.800 moles of CO2
So, 0.800 moles of CO2 are produced when 0.400 moles of glucose are used in the fermentation reaction.
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Please Balance the Chemical Equations 1 - 6
The balanced equations are given below:
1. 2 Cu₂O + C ---> 4 Cu + CO₂
2. 2 H₂O₂ ---> 2 H₂O + O₂
3. 2 AI + Fe₃N₂ ---> 2 AlN + 3 Fe
4. 8 Ag₂S --> 16 Ag + S₈
5. 3 ZnS + 2 AIP ---> Zn₃P₂ + Al₂S₃
6. 2 Fe(OH)₃ ---> Fe₂O₃ + 3 H₂O
What are balanced equations?A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.
An element is balanced if it has the same amount of atoms on both sides of the equation. The equation is balanced if all the moles of atoms of component elements are equal on both sides of the equation.
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How can snowfall be caused by air mass movement and changes?
Answer: These confrontations of different air masses are called frontal boundaries. A cold front occurs when a colder air mass comes in contact with a warmer air mass. A violent change in weather occurs as the cold air mass digs underneath the warm air mass creating thunderstorms and snowstorms in the winter.
yes very nice
explain how the bonding model for sodium metal would differ from the bonding model for sodium chlordie, NaCl
The bonding model for sodium metal and sodium chloride are fundamentally different, reflecting the differences between metallic and ionic bonds. The metallic bond in sodium metal is characterized by free electrons, while the ionic bond in sodium chloride is characterized by the strong electrostatic forces between positive and negative ions.
Sodium (Na) is a metal, and its bonding model is based on the metallic bond. In a metallic bond, the valence electrons are not bound to any one individual atom, but instead are free to move through the entire metallic lattice, resulting in a highly conductive, solid material. The metallic bond is held together by electrostatic attraction between the positively charged metal ions and the negatively charged electrons.
On the other hand, sodium chloride (NaCl) is an ionic compound, and its bonding model is based on the ionic bond. In an ionic bond, electrons are transferred from one atom to another atom, resulting in the formation of ions. The positive and negative ions are held together by strong electrostatic forces.
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Sulfuric acid is produced by first burning sulfur to produce sulfur trioxide gas
2S(s) + 3O2(g) → 2SO3(g)
then dissolving the sulfur trioxide gas in water
SO3(g) + H2O(l) → H2SO4(l)
Calculate the mass of sulfuric acid produced if 1.25 g of sulfur is reacted as indicated in the above equations.
Answer:
3.82 g.
Explanation:
To calculate the mass of sulfuric acid produced from 1.25 g of sulfur, we'll have to balance the chemical equations and use stoichiometry.
Starting with the first reaction:
2S(s) + 3O2(g) → 2SO3(g)
Since 1.25 g of sulfur is reacted, the number of moles of sulfur can be calculated as:
moles = mass / molar mass = 1.25 g / 32 g/mol = 0.03906 mol
Next, using the mole ratio from the balanced chemical equation, we can find the number of moles of sulfur trioxide produced:
2 moles of sulfur produce 2 moles of sulfur trioxide, so:
moles of SO3 = moles of S x (moles of SO3 / moles of S) = 0.03906 mol x (2 mol / 2 mol) = 0.03906 mol
Finally, we move on to the second reaction, the dissolution of sulfur trioxide in water:
SO3(g) + H2O(l) → H2SO4(l)
Using the mole ratio from this balanced equation, we can find the number of moles of sulfuric acid produced:
1 mole of sulfur trioxide reacts with 1 mole of water to produce 1 mole of sulfuric acid, so:
moles of H2SO4 = moles of SO3 x (moles of H2SO4 / moles of SO3) = 0.03906 mol x (1 mol / 1 mol) = 0.03906 mol
The mass of sulfuric acid produced can be calculated using the moles and the molar mass of sulfuric acid:
mass = moles x molar mass = 0.03906 mol x 98 g/mol = 3.82 g
Therefore, if 1.25 g of sulfur is reacted, the mass of sulfuric acid produced is approximately 3.82 g.
300cm3 of oxygen at 10 atmospheric pressure is placed in a 5.0dm ^2 container. calculate the new pressure ( in atom ) if the temperature is kept constant
The new pressure of the oxygen in the container is approximately 8.74 atm.
What is the Ideal Gas Law?According to the Ideal gas Law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in kelvins. We can use this equation to solve for the new pressure, as long as we know the other variables.
First, we need to find the number of moles of oxygen in 300 cm³. We can use the ideal gas law to convert cm³ to liters and find the number of moles:
V = 300 cm³ = 0.3 L
R = 8.31 J/ mol·K
T = (273 + 20) K = 293 K (room temperature)
n = PV / RT = (10 × 0.3) / (8.31 × 293) = 0.001054 moles
Next, we need to find the new volume of the oxygen, given the container size. We can convert the 5.0 dm² container to cm² and find the volume:
V_container = 5.0 dm² × 10⁴cm²/dm² = 5.0 × 10⁴ cm³
V_new = V_container - V = 5.0 × 10⁴ - 0.3 = 49999.7 cm³
Finally, we can use the ideal gas law to find the new pressure:
P_new = (nRT) / V_new = (0.001054 × 8.31 × 293) / (49999.7 / 10³) = 8.74 atm
So, the new pressure of the oxygen in the container is approximately 8.74 atm.
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How many electrons are in the valence shell of the sodium atom shown below?
Answer:
answer is one
Explanation:
valency is the amount of electrons on the last shell
help me with Questions number 2
High insulation resistance, high dielectric strength, low dielectric constant, low dielectric loss at all frequencies, strong resistance to cold flow, and exceptional abrasion resistance are only a few of the outstanding electrical qualities.
What are properties of Metals?On telephone signal and control cables, high frequency electronic cables, high and low voltage power cables, line wire, neutral supported secondary, and service drop cable, polyethylene is frequently used as insulation.
In comparison to polyethylene resins, polypropylene is less dense. This polymer's chemical, electrical, and electrical characteristics are comparable to those of polyethylenes. Its fluid resistance is a little higher. It has a somewhat lower dielectric constant than LDPE.
Compared to polyethylene, polypropylene is significantly stiffer and tougher. Additionally, its elasticity at low temperatures is not great. If antioxidants are not present, heat and light can cause it to deteriorate.
Therefore, High insulation resistance, high dielectric strength, low dielectric constant, low dielectric loss at all frequencies, strong resistance to cold flow, and exceptional abrasion resistance are only a few of the outstanding electrical qualities.
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how would you determine the numerical value of the theoretical heat of reaction, dhrxn for the reactions investigated in this experiment if the initial temperature of the water used in the calorimeter is 72oc for all of the reactions studied in this lab?
To determine the numerical value of the reaction, for the reactions investigated in this experiment by the equation Hrxn = q r xn / n,
The numerical value of the theoretical heat of reaction (dhrxn) can be determined using the equation qrxn = mc∆T, where qrxn is the heat of reaction, m is the mass of the water, c is the specific heat capacity of the water, and ∆T is the change in temperature. In this experiment, the initial temperature of the water used in the calorimeter is 72 degree Celsius. Thus, to calculate the dhrxn, the mass of the water and the final temperature of the water after the reaction can be used. The change in temperature (∆T) is the difference between the initial temperature of the water and the final temperature of the water. To determine the final temperature of the water, the heat released by the reaction must be measured using a calorimeter. This can be done by recording the temperature of the water at different intervals until the reaction is complete. After the heat of reaction is determined, the dhrxn can be calculated using the equation qrxn = mc∆T.
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Calculate the number of moles in butane C4H10 in 151g of butane (at masses c =12 amu and H=1 )
The number of moles in butane C4H10 in 151gm of butane is 2.605 moles.we can do this with the help of molecular weights of C,H.
To calculate the number of moles in 151 grams of butane (C4H10), we need to determine the molecular weight of butane. The molecular weight of butane can be calculated using the atomic masses of its elements:
1 mole of C = 12 g 1 mole of H = 1 g
So, the molecular weight of butane can be calculated as: 4 moles of C * 12 g/mole + 10 moles of H * 1 g/mole = 4 * 12 + 10 * 1 = 48 + 10 = 58 g/mole
Now that we know the molecular weight of butane, we can use it to calculate the number of moles in 151 grams of butane:
151 g of butane / 58 g/mole = 2.605 moles
Therefore, there are 2.605 moles of butane in 151 grams of butane.
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5. There are two signals in the 1H NMR spectrum of the product: the signal at 1. 15 ppm and the signal at 2. 10 ppm. Which signal is more deshielded and why is that so considering the structure of the product
The NMR signal at 2.10 ppm is more deshielded, meaning it is more chemically shift shifted to a higher field compared to the signal at 1.15 ppm. That is due to protons that are closer to electronegative atoms.
Chemical Shift in 1H NMR SpectroscopyIn the 1H NMR spectrum of a product, the chemical shift of the signals provides information about the environments of the protons in the molecule. The signal at 2.10 ppm is more deshielded compared to the signal at 1.15 ppm, meaning that it is shifted to a higher field. This indicates that the protons responsible for the signal at 2.10 ppm are closer to electronegative atoms or are experiencing a strong inductive effect, leading to greater electron density around the nucleus and hence a more deshielded signal. On the other hand, the signal at 1.15 ppm is due to protons that are further away from electronegative atoms or experiencing weaker inductive effects, resulting in less electron density around the nucleus and a less deshielded signal. Understanding the chemical shifts in 1H NMR spectra requires knowledge of the molecular structure and the environments of the protons in the molecule.
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what percentage of the iceberg was under water? let the density of the water be 1.0 g/cm3 , and the density of the ice be 0.92 g/cm3 .
92% percentage of the iceberg was under water.
The percentage of an iceberg that is under water can be calculated by finding the ratio of the submerged portion of the iceberg to its total volume, and converting this ratio to a percentage. To do this, we need to know the density of the ice and water and the densities of both materials.
If the density of water is 1.0 g/cm3 and the density of ice is 0.92 g/cm3, then the iceberg will float in water. The portion of the iceberg that is above water will have a volume equal to the difference in the volumes of the water displaced and the portion of the iceberg that is above water.
Let V be the volume of the iceberg, and Vw be the volume of water displaced. Then, the portion of the iceberg that is above water will have a volume of V - Vw. The portion of the iceberg that is below water will have a volume of Vw. The percentage of the iceberg that is under water is given by:
Density of water = 1g/cm^3
Density of Ice = 0.921g/cm^3
ρ(ice)V(ice) = ρ(water)V(water)
so, V(water) =(ρ(ice)V(water))/ ρ(water)
or, V(water) = 0.92V(water)/1.0
V(water) = 0.92V(ice)
So, 92% percentage of the iceberg was under water.
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