There are 4 different products will be formed from a poorly planned crossed aldol addition.
In a crossed aldol condensation, two distinct ketone and aldehyde reactants are used. Due to the possibility of several enolate nucleophiles as well as multiple carbonyl electrophiles, similar reactions typically result in a variety of distinct condensation products.
Ethanol and propanol undergo cross-aldol condensation, which results in two products:
one where ethanol serves as an enolate ion and the other where propanol serves as an enolate ion. 2-Methylbut-2-enal and Pent-2-enal are just the two cross-aldol derivatives.Therefore, the correct answer will be option (d)
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There are four different products can be formed from a poorly planned crossed aldol addition.
So the correct option is D
Two distinct ketone and aldehyde reactants are used in a crossed condensation reaction. Due to presence of distinct ketone and aldehyde reactants there are possibility of formation of several enolate ion nucleophiles as well as multiple carbonyl electrophile .
Example : Ethanal and propanone undergoes cross-aldol condensation reaction and give results in two products.
First case: ethanal acts as enolate ion
Second case: propanone acts as enolate ion
Third case: when self condensation is also a product.
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what do chemical and physical change have in common?
Explanation:
The similarities between chemical and physical changes include change in state of matter and both process involve change in energy.
Chemical changes of a substance results in the formation of entirely new substances. These changes are not reversible.
Physical changes results in the change of the state of the substance which can be reversed.
However, both chemical and physical changes results in change of state of matter and both process results in change in energy.
Thus, we can conclude that the similarities between chemical and physical changes include change in state of matter and both process involve change in energy.
(it's alre answered but here it again 'NOTE: not my answer')
The coefficient of performance (cop) of a refrigerator is defined as the ratio of?
The coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
The usable heating or cooling delivered to work required ratio, also known as the coefficient of performance, or COP, of a heat pump, refrigerator, as well as air conditioning system. Higher efficiency, less energy (power) usage, and thus reduced operational costs are all related to higher COPs.
Coefficient of performance formula:
[tex]K = Q_{H} / W_{in}[/tex]
where, K = Coefficient of performance, [tex]Q_{H}[/tex] = heat of pumps output, [tex]W_{in}[/tex] = work required by the system.
It is refrigeration's coefficient of performance (COP) will always be greater than 1.
Therefore, the coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
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Strontium-89 undergoes beta decay, after 88 days a sample has decreased to 30% its original size. What is the half-life of sr-89?.
The half-life of sr-89 will be 51 days.
What is a Beta decay?In nuclear physics, beta decay is a type of radioactive decay in which an atomic nucleus emits a beta particle (a fast energetic electron or positron), which changes the original nuclide into an isobar of that nuclide. Prior to beta decay, neither the beta particle nor the associated (anti-)neutrino is present in the nucleus; instead, they are produced during the decay process. This procedure gives unstable atoms a protons-to-neutrons ratio that is more stable.The weak force, which is characterized by relatively slow decay durations, results in beta decay. Up and down quarks make up nucleons, and the weak force allows a quark to change the flavor of its lepton by emitting a W boson, which produces an electron/antineutrino or positron/neutrino pair.For instance, the disintegration of a neutron, which consists of two down quarks and an up quark, produces a proton, which consists of a down quark and two up quarks.Because the fundamental nuclear mechanism, mediated by the weak force, is the same, electron capture is occasionally considered a kind of beta decay. In electron capture, a proton in the nucleus captures an inner atomic electron, turning it into a neutron, and releasing an electron neutrino.To learn more about beta decay strontium-89 click here-
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Rounding to the nearest
tenth, what is the mean of
85, 85, 100, 90, 100, 85,
80, 100, 90?
For calculating mean value, add up all of the values then divide by the number of them. 815/9 is about 90.6
What is mean value?The mean refers to the average of a set of values. The mean can be computed in a number of ways, including the simple arithmetic mean (add up the numbers and divide the total by the number of observations), the geometric mean, and the harmonic mean.
Moreover, the mean can be used to represent the typical value and therefore serves as a yardstick for all observations. For example, if we would like to know how many hours on average an employee spends at training in a year, we can find the mean training hours of a group of employees.
Hence, the mean can be calculated only for numeric variables, no matter if they are discrete or continuous. It's obtained by simply dividing the sum of all values in a data set by the number of values.
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A gas has a volume of 27. 5 L at 302 k and 1. 40 atm. How many moles are in the sample of gas?
There are 1.554 moles are in the sample of gas when a gas has a volume of 27. 5 L at 302 K and 1. 40 atm.
Calculation,
The given question is solved by the using of ideal gas equation which is shown below.
PV = nRT .... ( i )
where , P is he pressure of the gas = 1. 40 atm
V is the volume occupied by the gas = 27.5 L
R is the universal gas constant = 0.082 L atm/K mol
T is the temperature = 302 K
n is he number of moles of the gas = ?
By putting the value of pressure P , volume V , Universal gas constant and temperature T in the equation ( i ) we get the number of moles.
1. 40 atm × 27.5 L = n × 0.082 L atm/K mol× 302 K
n = 1. 40 atm × 27.5 L/0.082 L atm/K mol× 302 K = 1.554 mole
There are 1.554 moles are in the sample of gas
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What would it mean if you added liquid bromine to your final transfer hydrogenation product and the resulting mixture converted from dark maroon to clear upon heating?
For breaking alkenes, liquid bromine was utilized. When liquid bromine is added to the finished product and it turns clear, it has reacted.
The principal test used to determine the organic compound's unsaturation in a qualitative examination of organic compounds is the bromine water test. It aids in determining the compound's functional group.
Unsaturated hydrocarbons and bromine water engage in an additional process. When the double bond breaks, bromine is added. The reaction's final result has no color.
However, there is no addition reaction when bromine water combines with saturated hydrocarbons. As a result, the solution's hue is unchanged and remains brown.
So, a qualitative test for saturated and unsaturated hydrocarbons is a reaction with liquid bromine.
The presence of unsaturated hydrocarbons, or functional groups with double bonds, can be seen in the mixture when it transforms into a clear
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What may indicate that the pressure within a container is increasing and that container failure may be imminent?
Answer:
An increase in the intensity of sounds or fire issuing from a relief valve.
What does "contents under pressure" mean?Propane serves as the propellant in all aerosols. R-12, a Freon that was the previous propellant, has been outlawed because it harms the ozone layer above the poles. Propane and R-12 share the same pressure-temperature characteristics.
Propane's boiling point is quite low. It desires a boil-off at ambient temperature. And it continues to do so until the pressure inside a closed container rises to roughly 150 psi (give or take depending on temperature), at which time the boiling point is raised high enough to cause the substance to stop boiling.
"Contents Under Pressure" is exactly what the notice indicates. Paint, hairspray, lubricant, wasp and hornet spray, among other liquids, can be found within an aerosol can, which is a pressure vessel. By inspecting the bottom, you may determine whether a vessel is a pressure vessel. If it is dished in like a bowl, it has the same pressure-holding end as a huge propane tank, with the exception that the curve on the latter has an outward orientation. On aerosol canisters, it is inward because they must sit upright for ease. A circular bottom just cannot accomplish that. But the top resembles an outer hemisphere more or less.
Thank you,
Eddie
A pure element unbound or in a diatomic state, such as cl2, always has an oxidation number of ________. a. 1 b. 2 c. magnitude equal to its valence number d. 0
A pure element unbound or in a diatomic state, such as cl2, always has an oxidation number of 0 (zero).
Why does pure element or a diatomic molecule has zero oxidation state?In a neutral substance with atoms of only one element, the oxidation number of an atom is zero. As a result, the oxidation number of the atoms in O2, O3, P4, S8, and aluminum metal is 0. The oxidation numbers for an element in its normal state will be zero. O2 and Cl2 are diatomic gas molecules that occur naturally, thus when they are in that state, they have an oxidation state of zero. Metals like zinc will also have an oxidation number of zero if they are in their natural solid state.
O2 and Cl2 are neutral diatomic, hence they will always have a zero oxidation state. It is impossible for one oxygen atom to have a negative 2 charge while the other has a positive 2. The oxidation states should be 0 if the elements are solids, liquids, or any type of diatomic molecule.
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option (d) 0 is the right option.
A pure element unbound or in a diatomic state, such as cl2, always has an oxidation number of 0.
An unbound or diatomic pure element, like cl2, always has an oxidation number of 0 (zero).
Why does a diatomic molecule or pure element have zero oxidation state?The oxidation number of an atom is 0 in a neutral substance that contains solely atoms of one element. Because of this, the oxidation number of the atoms in aluminum metal, O2, O3, P4, and S8 is 0. An element will have zero oxidation numbers in its natural state. Since O2 and Cl2 are diatomic gas molecules that are found in nature, they have an oxidation state of zero while they are in that state. If a metal is in its natural solid state, it will also have an oxidation number of zero.O2 and Cl2 will always have a zero oxidation state because they are neutral diatomic. One oxygen atom cannot have a negative charge of two while the other has a positive charge of two. If the elements are solids, liquids, or any sort of diatomic molecule, the oxidation states should be 0.To learn more diatomic state visit:
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A glow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.
A glow stick will glow longer at lower temperatures than at room temperature, one can infer from the observation. Temperature and reaction time are the test variables.
We notice in this reaction that a glow stick stored in the freezer lights for a longer period of time than a glow stick stored at normal temperature. This implies that temperature affects how long a response lasts.
The most straightforward explanation for this observation is that glow sticks glow longer in colder temperatures than they do at room temperature; as a result, glow sticks kept in the freezer are observed to glow longer than glow sticks kept at room temperature.
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What is the molality of ethylene glycol, c2h4(oh)2, in a solution prepared from 2. 331×103 g of ethylene glycol and 2. 00×103 g of water, h2o?
Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m
Ethylene Glycol is known as C₂H₄(OH)₂. It is added in water to prepare an Antifreeze solution.
Given,
Mass of Ethylene Glycol = 2.331 × 10³ g = 2.331kg
Mass of Water = 2.00 × 10³ g
Since, Ethylene Glycol is in excess. Hence, it acts as a solvent and water acts as a solute.
We know, Molar Mass of Water = 18g
Hence, Moles of Water = Given mass of water / Molar Mass of Water
⇒ Moles of Water = 2000 / 18
⇒ Moles of Water = 111.1
Molality is defined as the moles of solute present in a given solvent in kg.
∴ Molality = Moles of Solute / Mass of Solvent (in kg)
Molality = Moles of Water / Mass of Ethylene Glycol
⇒ Molality = 111.1 / 2.331
⇒ Molality = 47.6m
Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m
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In a chemical hot pack, iron powder and oxygen react to form iron oxide in the presence of a catalyst. This reaction causes the temperature of the hot pack to increase. This process is
Answer:
exothermic
Explanation:
exothermic reactions give off heat.....or the temp of the substances increases
Consider the slightly soluble base bs(oh)2. if the molar solubility of the base is 1.82 ⋅ 10 − 2 , what concentration of hydroxide is dissolved in a saturated solution?
Answer:
Explanation to the following:
Why does the C-14/C-12 ratio change with time in fossils?
A. C-14 is no longer being produced in the atmosphere.
B. The C-14 half-life changes over time in a known way.
C. C-14 decays but C-12 stays the same after death.
D. C-12 also begins to decay over long periods of time.
Answer:
C. C-14 decays but C-12 stays the same after death.
Explanation:
C-12 is stable and won't change. C-14 is slightly radioactive. It decays over time to C12. A living plant or animal has a fairly constant C14/C12 ratio during it's lifetime. Sources of food have a fairly consistent C-14/C-12 ratio. Once it dies, the C-14 is no longer replenished, so the ratio of C-14 to C-12 drops over time, giving paleontologists the ability to carbon-date the sample. The less C-14, the older the sample.
The use of phenol (carbolic acid) as a surgical wound disinfectant was first practiced by?
The use of phenol (carbolic acid) as a surgical wound disinfectant was first practiced by Joseph Lister.
Who was Joseph Lister?
Joseph Lister was a surgeon, scientist, pathologist, etc. He was famous for the discovery of the prevention of infection in wounds. He first used phenol as a disinfectant agent for wounds.
Phenol is an inorganic compound, it is white crystalline and solid. It was used by Joseph Lister as an agent for a disinfectant agent. He discovered the safer medical procedure.
Thus, Joseph Lister was the first to utilize phenol (carbolic acid) to sterilize surgical wounds.
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24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
The pH of the solution is 12.88.
Calculation:
millimoles of NaOH = volume x Molarity
= 24.00 mL x 0.25 M
= 6.00 mmole
millimoles of HCl = 24.00 mL x 0.10 M
= 2.40 mmole
Total volume = 48.00 mL
NaOH + HCl → NaCl + H2O
initial 6.00 0 0 0
added 2.40
change -2.40 -2.40 +2.40 +2.40
equilibrium 3.60 0 2.40 2.40
The pH is determined by the excess of NaOH present.
[NaOH] = millimoles/volume
= 3.60/48.00
= 0.075 M
pOH = -log (OH⁻).
= -log (0.075)
= 1.12
Then
pH + pOH = pKw = 14.00.
pH = 14 - pOH
pH = 14 - 1.12
pH = 12.88
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A 4.0 mg/dl creatinine standard is needed. to prepare 100 ml of the working standard. How much stock standard of 1 mg/ml creatinine is needed?
4 ml stock is needed for the standard of 1 mg/ml creatinine if a 4.0 mg/dl creatinine standard is needed to prepare 100 ml of the working standard.
Your muscles produce creatinine as a waste product during routine, everyday action. In a typical state, your kidneys remove creatinine from your blood and excrete it in urine. Creatinine can accumulate in the blood and less creatinine will be excreted in the urine if there is an issue with your kidneys.
A high amount of creatinine in the blood or urine may indicate that the kidneys are not doing a good job of filtering the blood. Although high creatinine levels do not pose a life-threatening hazard, they may be a sign of a major health problem, such as chronic renal disease.
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What impact would adding twice as much na2co3 than required for stoichiometric quantities have on the quantity of product produced?
The product will not be affected by the addition of twice as much Na₂CO₃.
What is Limiting reagent in stoichiometry ?The maximum quantity of the end product determined by a balanced chemical equation is known as the Stoichiometry.The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced, and the one which remains unconsumed after the final reaction is in Excess.Calculate the moles of each reactant present and contrast it with the mole ratio of the reactants in the balanced equation to determine which reactant is the limiting one.Here,taking the stoichiometry into consideration, we find that the reaction happens with 1:1 ratio; so, adding twice the amount of Na₂CO₃ will lead to its excess making the other the limiting reactant, hence, it would not affect the yield of the product.
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0. 102 g of an unknown compound dissolved in 100. Ml of water has an osmotic pressure of 28. 1 mmhg at 20°c. Calculate the molar mass of the compound.
The molar mass of the compound is 68 g/mol.
What is the molar mass?The Osmotic pressure can be obtained from the relationship;
π= iCRT
π= osmotic pressure = 28.1 mmHg or 0.037 atm
i = Vant Hoff factor = 1
C = concentration = ?
R = gas constant = 0.082 atmLK-1Mol
T = temperature = 20°c + 273 = 293 K
C = π/iRT
C = 0.037/1 * 0.082 * 293
C = 0.0015 M
Now;
Number of moles = C/V = 0.0015/100 * 10^-3
= 0.015 moles
Number of moles = mass/molar mass
Molar mass = mass/Number of moles = 0. 102 g/ 0.015 moles = 68 g/mol
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The iodine test is used to test for the presence of starch which is a type of ___________ treated with an iodine solution, the starch reacts with the iodine solution and produces a ___________ color.
A. protein, blue-purple
B. protein, yellow
C. carbohydrate, yellow
D carbohydrate, blue-purple
When
Answer:
D. carbohydrate, blue-purple
Explanation:
Carbohydrates are one of many types of macronutrients found in certain foods and drink. For example, sugars, starches, and fibers are carbohydrates.
When starch is present, using an iodine solution will turn it blue-black or purple. If starch is NOT present, it will stay orange or yellow. The reason starch reacts with iodine is due to the amylose present in starch. Iodine is not soluble in water, so it's dissolved along with potassium iodide that forms a triiodide molecule. That then enters the helical structure of amylose and changes its color.
How many moles are in 25.3 grams of SO 3?
A.
3.16
B.
0.316
C.
2 020
D.
105
Answer:
B.) 0.316
Explanation:
To find the moles, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.998 g/mol
Molar Mass (SO₃): 32.065 g/mol + 3(15.998 g/mol)
Molar Mass (SO₃): 80.059 g/mol
25.3 grams SO₃ 1 mole
------------------------- x ------------------------- = 0.316 moles SO₃
80.059 grams
PLEASE HELP ASAP for 75 points
A 5.00 L flask is charged with 63.45 grams of I₂ and 2.5 atm of F₂ at 25°C. The flask is heated to 100°C until one of the reagents is completely consumed. What will be the total pressure (in atm) of the final products in the flask at 100°C?
Based on the calculations, the total pressure of the final products is equal to 1.76 atm.
How to calculate the total pressure (in atm)?From the information provided about this chemical reaction, we can logically deduce the following parameters:
Volume, V = 5.00 L.Mass, m of I₂ = 63.45 grams.Pressure, P of F₂ = 2.5 atm.Initial temperature, t₁ = 25°C.Final temperature, t₂ = 100°C.Next, we would write the properly balanced chemical equation for this chemical reaction:
I₂ + 5F₂ ⇒ 2IF₅
Also, we would determine the number of moles of each atom of I₂ and F₂:
[tex]Number \;of \;moles = \frac{mass}{molar\;mass}[/tex]
Substituting the given parameters into the formula, we have;
Number of moles = 63.45/253.8
Number of moles = 0.25 moles.
Assuming I₂ were limiting, we would need:
5 × 0.25 = 1.25 moles of F₂.
For fluorine gas, we have:
PV = mRT/MM
Mass, m = PVMM/RT
Mass, m = 2.5(5.00)(38)/(0.0821 × 298)
Mass, m = 475/24.4658
Mass, m = 19.42 grams.
Number of moles = 19.42/38
Number of moles = 0.51 moles.
The total number of moles = 0.25 + 0.51 = 0.76 mol.
For the mole fraction of I₂, we have:
Mf = 0.25/0.76
Mole fraction = 0.33.
For the mole fraction of F₂, we have:
Mole fraction = 1 - 0.33 = 0.67.
Next, we would determine the total pressure of the two elements by applying Dalton's law:
Total pressure = 0.33 × 0.27 + 0.67 × 2.5
Total pressure = 1.76 atm.
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If you start with 227.8 grams of iron and 128 grams of oxygen to produce iron oxide, what is the limiting reagent? you will need to balance the equation first. don't forget that oxygen is diatomic (o 2 ) when finding the molar mass. fe o2 -> fe2o3
Fe is the limiting reactant.
The balanced chemical equation between iron and oxygen to produce iron (III) oxide is
4Fe(s) + 302(g) - ---> 2Fe2O3(s)
Mass of Fe = 227.8 g
Moles of Fe = 227.8gFe*Imol Fe/55.85g Fe = 4.079mol Fe
Mass of oxygen = 128 g
Moles of O2 = 128g02 * 1molo/32g02 = 4molO2
Calculating the limiting reactant: The reactant that produces the least amount of product will be the limiting reactant.
Mass of iron (III) oxide produced from Iron = 4.079mol Fe*2molFe2O3/4molFe*159.69g Fe2O3/1 mol Fe2O3 = 325.7gFe2O3
Mass of iron (III) oxide produced from oxygen = 4molO2 *2mol Fe2O3/3molO2*159.69gFe2O3/1mol Fe2O3 = 425.84gFe2O3
Iron (Fe) produces the least amount of the product iron (III) oxide. So, Fe is the limiting reactant.
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what is the nature of ions formed by different atoms.
The nature of ions formed by different atoms is as follows:
Metal atoms form positively-charged ionsNon-metal atoms form negatively-charged ionsWhat are ions?
Ions are substances which are formed when neutral atoms gain or lose electrons.
There are two types of ions based on the charge the ion carries;
anions - which are negatively-chargedcations - which are positively-chargedThe nature of the ions formed by different atoms depend on whether the atoms are atoms of metals or atoms of non-metals.
Metal atoms form positively-charged ions by the loss of one or more electrons as illustrated below:
M → M⁺ + e⁻where; M is a metal atom, M⁺ is a metal ion, and e⁻ is an electron.
Non-metal atoms form negatively-charged ions by the gain of one or more electrons as illustrated below:
N + e⁻ → N⁻where; N is a non-metal atom, N⁻ is a non-metal ion, and e⁻ is an electron.
In conclusion, the nature of ions formed by atoms depends on the nature of the atom, whether they are metallic or non-metallic atoms.
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What is the relationship between the light emitted by an atom and the energies of the electrons in the atom
The relationship between the light emitted by an atom and the energies of the electrons in the atom is that the energy emitted by an atom is equal to the difference between the energy of two orbitals.
According to Bohr's model:
In Bohr's theory, the electron can jump from a lower energy level to a higher energy level, and when the energy is removed electron comes back to the initial energy level. Bohr proposed the energy and radii of an electron in the atom are quantized.
Energy between the orbits is given by,
∆E = E -E°
where ∆E = difference between the energy of orbital.
E = initial energy
E° = final energy.
Thus, we concluded that the energies of electron in the atom is equal difference between the energy of two orbitals.
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The external expression of a mineral’s orderly internal arrangement of atoms is referred to as:____.
The external expression of a mineral’s orderly internal arrangement of atoms is referred to as its crystal form
Internally, a mineral's crystal structure, or regular, repeating arrangement of atoms, reflects the chemical makeup of the mineral. A CHEMICAL FORMULA, which only lists the proportions of the various elements and groups of elements in the mineral, can be used to describe the composition of a mineral. For minerals with a narrow range of composition, the latter idea—groups of elements—comes into play. Color, hardness, luster, crystal formations, density, and cleavage are characteristics that aid geologists in determining a mineral's identity in a rock. The atomic structure of a crystal essentially determines its form, cleavage, and hardness. Chemical composition is the main determinant of color and density.
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What mass of copper could be electroplated on the cathode in an experiment where an average of 200 ma was passed through the cell for 35 minutes?
There are 0.138 gram copper could be electroplated on the cathode in an experiment where an average of 200 ma was passed through the cell for 35 minutes .
Calculation ,
Given ; Current passed through copper ( I ) = 200 mA = 200×[tex]10^{-3}[/tex] A
time in second = 35 minutes×60 = 2100 sec
Current ( I )= Q/t
Q =It = 200×[tex]10^{-3}[/tex] A × 2100 sec = 420 C
96500 C of charge = 1 mole
420 C of charge = 1 mole ×420 C/ 96500 C = 0.00435 mol
In , the valancy of Cu is +2 .
2 moles of electron are required for the decomposition of 1 mole of Cu on the cathode .
0.00435 mol of electron are required for the decomposition of Cu = 1mol × 0.00435 mol/2 = 0.002175 mol of Cu
Number of moles of Cu = given mass / molar mass
Mass of Cu = Number of moles of Cu × molar mass = 0.002175 ×63.546
Mass of Cu = 0.138 gram
Therefore , mass of copper is 0.138 gram
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Typically, amides will hydrolyze under ________ conditions than esters. stronger milder more saline less vigorous more dilute.
Typically, amides will hydrolyze under milder conditions than esters.
So, second option is correct one.
In acidic medium, amide interact with the water molecules to give a carboxylic aid and salt of ammonia or amine salt whereas in a basic medium, amides interacts with water molecules to give carboxylic aid and salt of ammonia or amine salt. An amides will hydrolyze under milder conditions because amide is least reactive than ester. The electronegativiy of nitrogen is less than oxygen. So, nitrogen transfer more electron cloud than oxygen towards carbonyl carbon. So, carbonyl group of amide hydrolysis in milder condition than ester.
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The heating element of a hair dryer dissipates 1500 w when connected to a 180 v outlet. part a what is its resistance?
The resistance of the heating element is 21.61 Ω
Given
The power dissipated = 1500 W
Voltage = 180 V
We know that
Power = Voltage * Current
⇒ Power / Voltage = Current
⇒ 1500 W/180 V = Current
⇒ 8.33 A = Current
In order to calculate the resistance of the heating element. We Have to apply the formula
Power = (Current)^2 * Resistance
⇒ Resistance = Power / (Current)^2
⇒ Resistance = 1500 W/ (8.33) ^2
⇒ Resistance = 21.61 Ω
Hence the resistance of the heating element is 21.61 Ω
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Which of the following is always equal on each side of a balanced chemical equation?
Select one:
O a. The total number of ions.
Ob. The total number of molecules.
Oc. The total number of atoms of each element.
Od. The total number of different chemical compounds.
Answer:
the total number of molecules
Answer:
C.) The total number of atoms of each element.
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. If these values are not identical, they can be changed by adding coefficients to alter the amount of each molecule. By modifying the amount of molecules within the reaction, you can make the total number of atoms of each element equal on both sides.
What is the frequency of an x-ray
wave with an energy of
2.0 x 10^-17 J?
Please explain how!
Answer:
3.3 x 10⁻¹⁷ Hz
Explanation:
To find the frequency, you can use the following equation:
E = h / f
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> f = frequency (Hz)
You can plug the given values into the equation and simplify to find the frequency. This equation will require a little bit of rearranging.
E = h / f <----- Given equation
(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J*s) / f <----- Insert values
(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J*s) <----- Multiply both sides by f
f = 3.3 x 10⁻¹⁷ Hz <----- Divide both sides by 2.0 x 10⁻¹⁷
The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.
What is frequency ?
The term frequency is defined as the number of waves that pass a fixed point in unit time. Frequency is measured in hertz which is equal to one event per second.
Frequency also describes the number of cycles undergoes during one unit of time by a body in periodic motion.
Calculating the frequency, you can use the following equation:
E = h / f
Where,
E = energy (J)
h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
f = frequency (Hz)
Insert his values in the given equation
(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J × s) / f
(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J × s)
f = 3.3 x 10⁻¹⁷ Hz
Thus, The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.
To learn more about the frequency, follow the link;
https://brainly.com/question/5102661
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