Moseley's work led to the realization that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing atomic number.
The periodic table was arranged by atomic mass, and this nearly always gives the same order as the atomic number. However, there were some exceptions (like iodine and tellurium, see above), which didn’t work. Mendeleev had seen that they needed to be swapped around, but it was Moseley that finally determined it.
He fired the newly-developed X-ray gun at samples of the elements, and measured the wavelength of X-rays given. He used this to calculate the frequency and found that when the square root of this frequency was plotted against atomic number, the graph showed a perfect straight line. He’d found a way to actually measure atomic number.
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be sure to answer all parts. complete the reactions showing how you could prepare ethyl phenyl ketone from propanenitrile and a grignard reagent. draw the structure of the imine intermediate. propanenitrile draw structure ... grignard reagent h5arrowdown160 p4o10 diethyl ether pbr3 nacn h2o, h , heat [1] socl2; [2] nh3 draw structure ... h5arrowdown160 diethyl ether h2o, h , heat [1] socl2; [2] nh3 this step is not necessary nacn p4o10 pbr3 ethyl phenyl ketone
Phenylacetone is a natural product found in Streptomyces and Gossypium hirsutum for which data are available.
Propiophenone and its derivatives. They are commonly used in perfumes and medicines. Class 1C antiarrhythmic drug used to treat paroxysmal atrial fibrillation/flutter and ventricular arrhythmias.
Propiophenone is an aromatic ketone in which the two substituents on the carbonyl carbon atom are phenyl and ethyl. Methanal is the IUPAC name for formaldehyde and ethanal is the name for acetaldehyde. For ketones, remove -e from the alkane name and add the suffix -one. Propanone is his IUPAC name for acetone and butanone is the name for ethyl methyl ketone.
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List the following transition metal cations by their d electron count, with the highest at the top and the lowest at the bottom. 1. Zn2+ 2. Co2+ 3. Ru4+ 4. Mo4+ 5. Pt2+.
The transition metal cations by their d electron count, with the highest at the top and the lowest at the bottom is A > E > B > C > D.
D8 Metals was founded in 2004 as a company specializing in aluminum and steel fabrication, architectural metals and claddings, and custom electromechanical projects. Instead of an 8-electron rule or octet, transition metals follow an 18-electron rule. The easiest way to count electrons is to break down the complex and count the electrons apart.
There are 40 elements in the d block of the periodic table. Four rows of transition elements make up the d block. The d-electron number is a chemical formalism used to describe the electronic configuration of the valence electrons of the transition metal centers of coordination complexes. The d electron number is an effective way to understand the shape and reactivity of transition metal complexes.
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based on your knowledge of intermolecular forces and trends, select the statement that most accurately compares hcl and hbr.
Since HBr has the largest mass, it will have the highest boiling point. Due to higher dipole, the intermolecular force between SiH4 molecules is stronger than that between h-cl molecules.
A polar molecule, HBr exhibits dipole forces. Dispersion forces also exist between HBr molecules. Van der Waals forces would be the dominant interactions in these molecules. The larger the size or molecular mass of hydrogen halides, the stronger the van der Waals forces and the higher the boiling point will be. Of these three halides, HI has the largest size or molecular mass. In H-Cl, there is no H-bonding. Therefore, the boiling point is lower. Moving on to HBr and HI, the molecules get bigger, the van der Waal forces get stronger, and the boiling point gets hotter. H-Cl has the lowest boiling point as a result.
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The particulate model below represents the redox reactions that produce energy from fuel cells. Use the model to answer the following questions.Part 1 Write a balanced half-cell equation for the reaction occurring at the anode. Ignore phases in the reaction.
Part 2 Write a balanced half-cell equation for the reaction occurring at the cathode. Ignore phases in the reaction.
Assuming excess oxygen, how many moles of electrons would be transferred if 3 moles of H2 were reacted. moles of electrons
Answer:
To answer this question, you need to first write the balanced half-cell equations for the reactions occurring at the anode and the cathode.
At the anode, the reaction is:
H2 → 2H+ + 2e-
At the cathode, the reaction is:
1/2O2 + 2H+ + 2e- → H2O
Then, assuming that there is excess oxygen, we can calculate the number of moles of electrons that would be transferred if 3 moles of H2 were reacted. To do this, we need to first determine how many moles of H+ ions are produced when 3 moles of H2 are reacted at the anode. This can be calculated using the balanced half-cell equation for the anode reaction, which shows that 2 moles of H+ ions are produced for every mole of H2 reacted. Therefore, 3 moles of H2 would produce 6 moles of H+ ions.
Next, we can use the balanced half-cell equation for the cathode reaction to calculate how many moles of electrons are transferred when 6 moles of H+ ions are reacted. This equation shows that 2 moles of electrons are transferred for every mole of H+ ions that is reacted. Therefore, 6 moles of H+ ions would result in the transfer of 12 moles of electrons.
Therefore, the final answer is:
12 moles of electrons would be transferred if 3 moles of H2 were reacted.
explain why ncl3ncl3 is a liquid at room temperature while nh3nh3 is a gas. explain why is a liquid at room temperature while is a gas. hydrogen bonding is present in ncl3ncl3 but not in nh3nh3 . ncl3ncl3 has greater dipole moment than nh3nh3 and thus the dipole-dipole forces in ncl3ncl3 are stronger. the dispersion forces are greater in ncl3ncl3 than in nh3nh3 . ncl3ncl3 partly dissociates to form ions and nh3nh3 does not. therefore, ion-dipole interactions are present in ncl3ncl3 but not in nh3nh3 .
The NCl₃ is liquid at room temperature but NH₃ is gas at room temperature because NH₃ has the intermolecular hydrogen bonding , it hold thew ammonia very tightly.
The NCl₃ is liquid at room temperature but NH₃ is gas at room temperature because NH₃ has the intermolecular hydrogen bonding , it hold thew ammonia very tightly. the van der waal force is the weak force ads compared to the hydrogen bonding. NCl₃ partly dissociates to form ions and nh3nh3 does not. therefore, ion-dipole interactions are present in NCl₃ but not in NH₃
Thus, NH₃ is the gas at the room temperature and the NCl₃ is liquid at room temperature.
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IF YOUR ANSWER IS CORRECT YOU GET 100 EASY POINTS PLS HURRY
Given concerns over the overabundance of corn and corn-related products in American diets, which of the following distinguishes the best means of reducing corn consumption?
reducing options costs for corn crops
cutting subsidies to corn growers
increasing international corn imports
lowering prices for corn and corn products
The best means of reducing corn consumption is cutting subsidies to corn growers. Option B
What is corn?We know that corn is a kind of crop that is common in America and there are several kinds of products that we can be able to obtain from corn that are used in the care of the body. We know that corn is a cereal and a lot of baby foods are based on the use of cereals and this has brought the use of corn into very popular demand around the world and not just in the United States.
Having said all that, we know that corn is a rich source of carbohydrate but there is need for the consumption of a balanced diet and this should have to be the aim of the nutritional efforts that we tend to embark on.
This is why the reduction on the consumption of corn becomes very important as this would make the corn not to be able to remain the only staple food in many house holds in the country.
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the electron geometry of a moeluclar who has a central atom with four single bonds and one lone pair of electrons is which of the following
The molecular geometry of a molecule whose central atom has four single bonds and two lone pairs of electrons is square planar.
The shape of the orbitals is octahedral. Two orbitals contain lone pairs of electrons on opposite sides of the central atom. The remaining four atoms connected to the central atom give the molecule a square planar shape. If there are only two bonds and one lone pair of electrons holding the place where a bond would be then the shape becomes bent. For sp3 hybridized central atoms the only possible molecular geometry is tetrahedral. If all the bonds are in place the shape is also tetrahedral.
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political parties are most inclined to use which of the following strategies in national general election campaigns today?
Political parties are most inclined to match polling responses to identifiable individuals in voter files to determine patterns in national general election campaigns today.
Political parties are essential institutions of democracy. By competing in elections parties offer citizens a choice in governance, and while in opposition they can hold governments accountable. When citizens join political parties, volunteer their time, donate money and vote for their leaders, they are exercising their basic democratic rights.
In an election campaign winning is everything, there is no consolation for being a runner-up. With the increasing penetration of television and the internet, voters today are more informed, independent, and discerning in casting their votes.
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A cook heats water from 22 o C to 50 o C. Calculate the mass of water that could be warmed by the addition of 10.00kJof heat
Answer:
Explanation:
Q=M*C*ΔT
Where,Q=Required heat
C=Specific heat of water
ΔT=Temperature change
[tex]M=\frac{Q}{C*T}[/tex]
[tex]M=\frac{10000}{4.184*28}[/tex]
[tex]M=\frac{10000}{117.15}[/tex]
[tex]M=85.3g[/tex]
Q = mcT, where Q is the heat provided, m is the mass of water, and c is the temperature change, may be used to determine how much water can be warmed by the addition of 10.00kJ of heat.
What happens in this instance ?In this instance, the water's beginning temperature is 22°C, and its ultimate temperature is 50°C, meaning that there has been a 28°C change in temperature.
Water has a heat capacity of 4.184 J/g°C, therefore m = Q / (cT) = 10.00kJ / (4.184 J/g°C x 28°C) = 7.08kg is the mass of water that can be warmed by the addition of 10.00kJ of heat. As a result, 7.08 kg of water may be warmed with the addition of 10.00 kJ of heat.
Considering that heat immediately proportionate to the water's bulk and temperature. The amount of heat needed to warm the water increases with the bulk of the water and the temperature change.
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arrange the following substances from the lowest to the highest normal boiling point: calcium oxide, cao ; oxygen, o2 ; hydrogen, h2 ; formaldehyde, h2co ; and water, h2o .
The order of the lowest to highest normal boiling point:
H₂ < O₂ < H₂CO₃ < H₂O < CaO
The boiling point is what?The liquid phase turns into a vapor phase at this temperature.
The temperature at which a substance changes from the liquid phase into the gas phase is known as the boiling point. The melting point of ice or water and the boiling point of liquid water or vapor served as the foundation for the development of the Celsius scale. Every substance has a unique boiling point.
Since the ions in calcium oxide are strongly attracted to one another, its boiling point is 2850° C. As is already common knowledge, water has a boiling point of 100 °C.
The hydrogen gas has a boiling temperature of -252.8°C while the oxygen gas has a boiling point of -183°C. Carbonic acid has a boiling point of 333.6 °C.
Thus, of the listed chemicals, hydrogen gas has the lowest normal boiling point while CaO has the highest.
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In a set of experiments on a hypothetical one-electron atom, you measure the wavelengths of the photons emitted from transitions ending in the ground state (n=1) as shown in the energy-level diagram in the figure (Figure 1). You also observe that it takes 17.50 eV to ionize this atom.
The wavelength of the photon that is emitted from transitions ending in the ground state is 397.56 nm
E(n) = - k/n^2
In fact, since the ionization energy (from ground state) is:
-E(1), E(n) = - (17.5 eV)/n^2
E(1) = -17.5 eV
E(2) = -4.375 eV
E(3) = -1.94 eV .
E(4) = -1.094 eV
E(5) = - 0.7 eV
The change in energy going from n = 4 to n = 2 will be:
E(4) - E(2) = 3.281 eV
The change in energy = hc/∧, so
∧ = h/energy-change
= 6.626 x 10-34 x 3 x 108 /(3.281 x 1.6022 x 10-19 J)
= 397.56 x 10-9 m
= 397.56 nm
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place the following in order of increasing bond length. c-fc-sc-cl a) c-s < c-cl < c-f b) c-cl < c-f < c-s c) c-f < c-s < c-cl d) c-f < c-cl < c-s e) c-s < c-f < c-cl
The order of increasing bond length is d) c-f < c-cl < c-s
The bond length of a covalent bond is determined by the size of the atoms involved and the strength of the bond. The size of the atoms involved in the c-f, c-s, and c-cl bonds are carbon, fluorine, sulfur, and chlorine, respectively. Carbon and fluorine are smaller atoms, while sulfur and chlorine are larger atoms. Therefore, the c-f bond will be the shortest bond.
The strength of the covalent bond is determined by the electronegativity of the atoms involved. Fluorine has the highest electronegativity of all the elements, followed by chlorine and then sulfur. Therefore, the c-f bond will be the strongest bond. The c-cl bond will be the second strongest bond, and the c-s bond will be the weakest bond.
Given these facts, the order of increasing bond length is c-f < c-cl < c-s. The c-f bond will be the shortest and strongest bond, followed by the c-cl bond and then the c-s bond.
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which of the following represents the reaction of a strong acid with water? a generic acid, ha, is used in the reactions.
The chemical equation of the generic acid is
HA(aqueous) + H2O(liquid) → H3O⁺(aqueous) + A⁻(aqueous)
The generic acid formula is H₂GO₃, formed from two hydrogen ions (2 H⁺) and one product ion (GO₃²⁻). It is liquid at room temperature. Being generic, it does not have a defined melting point or boiling point, molar mass, pH, LD50, or many other properties. However, it is a weak acid. If you want a stronger acid, the hydrogen acid is stronger. It is the most famous generic compound. It's often used in fiction when writers don't want to indicate a certain kind of acid. Fictitious generic acids may have unrealistic properties, and using generic acids prevents authors from claiming that real substances do the impossible. The reaction of the generic acid is given above.
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the solution is known to contain an inorganic salt of one of the following elements. the solution is colorless. the solution contains a salt of
Simple electrolyte compounds are diluted solutions to form inorganic salt solutions. In abrasive machining, mineral salt solutions are utilised to cool the operation and stop rust and corrosion of the machinery and finished goods.
What components make up inorganic salts?In contrast to an organic salt, which has C-H bonds, an inorganic salt is one that does not. The chemical compound sodium chloride, which is made up of sodium and chloride ions, is one of the most well-known salts. For life to exist and flourish, inorganic salts are necessary.
An "Acidic Salt" is a salt that results from the interaction between a strong acid and a weak base.
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how many degrees of unsaturation are present in a molecule with the molecular formula c5h8brno? (1 pts)
The degree of unsaturation of the compound is 3.
What is the degree of unsaturation?When we talk about the degree of unsaturation, we are referring to the number of the hydrogen atoms that could not be found in the system. We know that when a saturated compound is formed, there is the loss of some of the hydrogen atoms from the molecular formula.
The term unsaturated in itself means that the compound do not have the exact number of the hydrogen atoms or the hydrogen atom compliment that it should normally have.
This would happen as the multiple bonds are formed then a given number of the hydrogen atoms would be lost from the system so that the multiple bond can now be formed in the compound that we are looking at. The more the number of the multiple bonds, the more the degree of unsaturation of the molecule.
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The protease papain, which can be isolated from papaya fruit, is a monomer with a single active site per protein molecule. The activity of purified papain was measured at various substrate concentrations and plotted on the Lineweaver burk plot below. Considering that the enzyme concentration is 1.2 x 10-7 M, answer the following questions 35 30 25 20 15 10 10 5 0 5 2025, 30 mM) Substratel A) Calculate Km for this substrate B) Calculate Vmax C) Calculate Keat D) Based on the Kea/ Km is this a good substrate for the enzyme E) What fraction of the total enzyme has substrate bound when the substrate concentration 2.5 x 104 M?
Km for this substrate Is 2 mM. Vmax of the substance is 14.9995 mM/s. The value of Kea for this enzyme is approximately 1.249 x 10^6 M^-1*s^-1. For this enzyme kea to km is very high ratio, indicating that the enzyme is a good substrate for the enzyme.
To calculate Km from a Lineweaver-Burk plot, you need to find the substrate concentration at which the reciprocal of the substrate concentration (1/[S]) is equal to the reciprocal of the initial velocity (1/V0). This point is called the point of inflection on the Lineweaver-Burk plot. In this case, the point of inflection is located at a substrate concentration of approximately 20 mM. At this point, the reciprocal of the substrate concentration is 1/[S] = 1/20 mM = 0.05, and the reciprocal of the initial velocity is 1/V0 = 0.1. To calculate Km, you can use the equation: Km = (1/V0) / (1/[S]) Plugging in the values, you get: Km = (1/V0) / (1/[S]) = 0.1 / 0.05 = 2 mM The value of Km for this substrate is 2 mM. To calculate Vmax, you can use the equation: Vmax = V0 / (1 + Km/[S]). Where Vmax is the maximum initial velocity, V0 is the initial velocity, Km is the Michaelis constant, and [S] is the substrate concentration. Aa substrate concentration of 2.5 x 10^4 mM, the initial velocity is approximately 15 mM/s. Plugging in the values, you get: Vmax = 15 mM/s / (1 + 2 mM / 2.5 x 10^4 mM) = 15 mM/s / (1 + 8 x 10^-4) = 15 mM/s / 1.00008 = 14.9995 mM/s The value of Vmax for this enzyme is approximately 14.9995 mM/s. To calculate Kea, you can use the equation: Kea = Vmax / [E] Where Kea is the catalytic constant, Vmax is the maximum initial velocity, and [E] is the enzyme concentration. Plugging in the values, you get: Kea = 14.9995 mM/s / (1.2 x 10^-7 M) = 1.249 x 10^6 M^-1*s^-1 The value of Kea for this enzyme is approximately 1.249 x 10^6 M^-1*s^-1. The ratio of Kea to Km is a measure of the efficiency of the enzyme-substrate complex. A high ratio indicates that the enzyme is a good substrate for the enzyme, while a low ratio indicates that the enzyme is a poor substrate for the enzyme. In this case, the ratio of Kea to Km is approximately 1.249 x 10^6 M^-1s^-1 / 2 mM = 6.245 x 10^4 M^-1s^-1. This is a very high ratio, indicating that the enzyme is a good substrate for the enzyme.
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How many grams of solute are present in 335 mL of 0.340 M KBr?
Answer:
41
Explanation:
Which of the following equations represents a chemical reaction? *
O Water freezing
O Ice melting
O Water boiling
O Burning
Burning fuel inside of an engine
Answer:
The correct answer is "Burning fuel inside of an engine." This is an example of a chemical reaction because it involves the rearrangement of atoms to create new substances. In this case, the fuel is reacting with oxygen in the air to produce heat, light, and various gaseous byproducts such as carbon dioxide and water vapor. By contrast, the other options are examples of physical changes, which involve changes in the state or appearance of a substance without changing its chemical composition.
Answer: Burning fuel inside of an engine
Explanation: Got it correct on the forms
(Edit: G o o g l e F o r m s)
After the explosion of the Deepwater Horizon oil-drilling platform in 2010, Scientists estimate that BP removed about ___ of the oil, most of it recovered directly from the well, burned at sea, or skimmed by boats
25%
After the explosion of the Deepwater Horizon oil-drilling platform in 2010, Scientists estimate that BP removed about 25% of the oil, most of it recovered directly from the well, burned at sea, or skimmed by boats.
Deepwater Horizon was a semi-submersible offshore drilling rig. It was owned by Transocean and operated by BP. While drilling at the Macondo Prospect on 20 April 2010, an explosion happened on the rig, killing 11 crewmen and igniting a massive fireball that was visible from 40 miles away.
The explosion was caused by a blowout, which is an uncontrollable crude oil and/or natural gas release from an oil well caused by a pressure control system failure. The rig itself sank two days after it exploded.
Both Transocean and BP received hefty fines, penalties, and compensations. On top of that, BP is also tasked with the oil spill cleanup, though other parties such as US Coast Guard also join in this effort. It took over ten years to clean the oil spill.
Attached below is an image of the Deepwater Horizon remains in flames after the explosion, taken on 20 April 2010 by US Coast Guard.
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the following are octane levels for various gasoline blends: 87.8, 84.9 86.7 87.5 91.6 88.6 95.1 93.3 94.2 88.3 90.4 91.5 91.6 93.4 which of the following stem-and-leaf plots describe the distribution more efficiently? group of answer choices a stem-and-leaf plot by using the tens digit as the stem a stem-and-leaf plot by using the first two digits (tens and ones digits) as the stem
plot(density(x),col = "blue") #As we can see the distribution is fairly Normal
q q line(x, col = "blue") #In Q Q P Lot the straight blue line should pass through maximum number of point at 45 degree (x, col = "blue", freq = FALSE)
lines(density(x), col = "red", lwd = 2) #We can also check distribution of Normal by Histrogram and superimpose red line
ad .test(x) #Anderson Darling test gives p value 0.1424 that mean there is 14.24 percent chance that his data is coming from Normal
t(x) Cramer-von Mises test gives p value 0.2147 that mean there is 21.47 percent chance that his data is coming from Normal
Llliefors (Kolmogorov-Smirnov) test gives p value 0.2355 that mean there is 23.55 percent chance that his data is coming from Normal
Pearson chi-square test gives p value 0.7301 that mean there is 73.01 percent chance that his data is coming from Normal
Shapiro- Francia test gives p value 0.03482 that mean there is 3.48 percent chance that his data is coming from Normal
Shapiro-Wilks test gives p value 0.07154 that mean there is 7.15 percent chance that his data is coming from Normal
#If p-value <= Alpha(=0.05) reject null hypothesis(i.e sample points comes from Normal Population) but we take Shapiro-Wilks test into account because it is distribution free and regarded as best test for Normality hence we accept the null hypothesis and conclude that the sample comes from Normal Distribution but it is not very much likely.
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Need an answer please
An electrostatic force of attraction between Ba ⁺² and P⁻³. Because barium has positive charge and phosphorus has negative charge. Therefore, option C is correct.
What is electrostatic force ?Non-contact forces, such as electrostatic forces, pull or push on objects without actually making contact with them. When certain materials are rubbed together, a phenomenon known as "charge" can be transferred from one surface to another. Uncharged items are pulled by charged objects, which in turn may push or pull against other charged ones.
The complete transfer of one or more electrons results in the formation of an ionic bond between two oppositely charged ions, which is where the electrostatic force of attraction takes place.
Thus, option C is correct.
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when an object is totally submerged in fluid, this object will be heavier (its mass will be larger) than when it is in the air
The Archimedes principle states that when an object is submerged in a fluid, it seems to lose weight proportional to the weight of the fluid that was displaced.
The mass of the water that the object moves is equal to this force. It turns out that it is still possible to demonstrate that even if the object is excessively heavy (density more than water), if the density of a fully submerged object (independent of its shape) is larger than the density of the fluid. Some objects float when submerged in a liquid because the buoyant force is greater than the object's weight, causing the object to rise to the surface and float. If an object's buoyant force exceeds its weight when submerged in a fluid, it will rise. We can determine the mass and weight of water once we know its volume.
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n outer space the density of matter is about one atom per cm3, mainly hydrogen atoms, and the temperature is about 2.3 k.
Space is generally thought of as a vacuum, but it isn't, not completely. The density of matter is extremely low, but it still exists. The interstellar medium is mainly made of lone hydrogen atoms. The density of hydrogen as it exists in interstellar space is on average about 1 atom per cubic centimeter.
In the extremes, as low as 0.1 atom per cubic centimeter has been found in the space between the spiral arms, and as high as 1000 atoms per cubic centimeter are known to exist near the galactic core. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins. However, there are areas in space where the temperature is extremely hot, reaching into the millions.
The bottom line: the temperature of outer space is brutally cold.
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A student determines the value of the equilibrium constant to be 6.54×103 for the following reaction. CO(g) + H2O(l)CO2(g) + H2(g) Based on this value of Keq: G° for this reaction is expected to be (greater, less) than zero. Calculate the free energy change for the reaction of 2.32 moles of CO(g) at standard conditions at 298K. G°rxn = kJ
A. Co + H₂O ⇄ co₂+ H₂
= -8.314[tex]\frac{J}{K.mol}[/tex] x298k x In (6.54x16³)
= -21.77 kJ/m0/
for 2.32 molco, A = -21.77×2-32
= -50.51kj/mol
B. Fe₂03(5) +3H₂(9) ⇄ 2 Fe(s) + 3H₂0(9)
= -8.314 × 298x/n (2.47x10⁻¹⁰)
= +54.807 kJ/mol
for 1.61 mol fe₂03, Δ4= 54.807 X 1.61 mol
= 88.24 kJ/mol.
Equilibrium constant numbers are obtained by allowing a single reaction to reach equilibrium and measuring the concentrations of each substance involved in the reaction. The ratio of product concentration to educt concentration is calculated. A mathematical ratio indicating product concentration divided by reactant concentration.
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select the statements that describe important rules for drawing skeletal structures. multiple select question. draw in all heteroatoms and the hydrogens directly bonded to them. draw in all heteroatoms and any lone pairs of electrons connected to them. assume there is a carbon atom at the junction of any two lines or at the end of any line. assume there are enough hydrogens around each carbon to give it four bonds.
The skeletal structure of the organic compounds are the series of the atoms bonded together and form the important structure of the compound.
The statements that describe important rules for drawing skeletal structures are :
1) all heteroatoms and the hydrogens directly bonded to them.
2) there is a carbon atom at the junction of any two lines or at the end of any line.
3) there are enough hydrogens around each carbon to give it four bonds.
These three option are the correct statements to describe the important rule for the drawing skeletal structures to represents the important structure of the organic compound.
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In a certain part of the country there is an average of 710 people per square mile and 0.72 internet services per person.what is the average number of internet services in an area of 5.0 kilo meter square?
The average number of internet services in an area of 5.0-kilometer square would be 0.36 internet services..
Calculation of averageThe average number of people per square mile = 710
1 square mile = 2.59 square kilometer
The average number of people per kilometer square = 710
Number of internet services per person = 0.72
The total number of people that would be in a 5.0-kilometer square = 710 x 5 = 3550 people.
710 people = 0.72 internet services
3550 people = 3550 x 0.72/710
= 3.6 internet services
in other words, the average number of internet services per person in an area of 5.0-kilometer square would be 0.36 internet services.
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Choose The Most Appropriate Reagent(S) For The Conversion Of 2-Methylcyclohexanol To 2- Methylcyclohexanone. Он 1. BH3 2. H20
The Most Appropriate Reagent(S) For The Conversion Of 2-Methylcyclohexanol To 2- Methylcyclohexanone is (A) PCC, CH₂Cl₂.
It is possible that carbonyl compounds will be produced as a byproduct of the oxidation of alcohols using pyridinium chlorochromate in CH₂Cl₂, however, this will depend on the specific type of alcohol. Primary alcohols will react with PCC to produce aldehydes while secondary alcohols will react with PCC to produce ketones, and tertiary alcohols will not react with PCC. So the most appropriate reagents for the conversion of 2-methylcyclohexanol to 2- methylcyclohexanone are (A) PCC, CH₂Cl₂. The reaction scheme along with the structures of reagents and products are attached.
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As a technician in a large pharmaceutical research firm, you need to produce 150.0 mL of 1.00 mol/L potassium dihydrogen phosphate buffer solution of pH = 7.00. The pKa of H2PO−4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH2PO4 stock solution, 1.50 L of 1.00 M K2HPO4 stock solution, and a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution? (Assume additive volumes.)Express your answer to three significant digits with the appropriate units.
The 105.152mL ok KH2 PO4 is the additive volumes.
What is volume ?
The volume of a three-dimensional solid is the area that it takes up. These solids can be shaped into cubes, cuboid shapes, cones, cylinders, or spheres.
What is dihydrogen phosphate ?
Phosphoric acid, which has had one of its three OH groups deprotonated, is used to create the monovalent inorganic anion known as dihydrogenphosphate. It is both an inorganic monovalent phosphate ion and an anion. This base is the conjugate of phosphoric acid. It is an acid conjugated to hydrogen phosphate.
pH = pKa + log (HPO4-2)/(H2 PO4-)
6.84 = 7.21+ log ( HPO 4 -2)/ (H PO4-)
- 0.37 = log (H PO4-2)/ (HPO4-)
0.4265 = (HPO4-2)/ (HPO4-)
(HPO4-2)= 0.4265 x (HPO4-)
let's call X to the volume of KH2PO4 needed. so, the volume needed of K2HPO4 will be 150-X, now transform concentration into moles
1M HPO4-2 x (150-X) = 0.4265 x 1M h2 PO4- x X
150-X = 0.4265X
150= 1. 4265X
X = 105.152mL ok KH2 PO4.
Therefore, 105.152mL ok KH2 PO4 is the additive volumes.
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the standard reduction potentials for fluorine gas to the fluoride ion and the aluminum (iii) ion to aluminum metal are 2.866 v and -1.662 v, respectively. t/f
The statement saying the standard reduction potentials for fluorine gas to the fluoride ion and the aluminum (iii) ion to aluminum metal are 2.866 v and -1.662 v, respectively is true.
The standard reduction potential of a species is defined as the measure of the ability of that species to get reduced during a redox reaction.
The value of the standard reduction potential are pre decided for each and every element.
The value of the standard reduction potential for fluorine gas to the fluoride ion is +2.866 V.
The value of the standard reduction potential the aluminum (iii) ion to aluminum metal is -1.662V.
Both of these values are stated correctly in the given question. So, the given statement is true.
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how many of the following salts are expected to be insoluble in water sodium sulfate barium nitrate ammonium sulfate potassium phosphate
The Insoluble Substance is Barium Nitrate
BANO4
Solubility rules for chromate (CrO₄²⁻) are all chromate are insoluble, except for ions group 1 (Li⁺, Na⁺, K⁺). So soluble chromate are
Li₂CrO₄
Na₂CrO₄
K₂CrO₄
Potassium chromate K₂CrO₄ is soluble.
A substance is said to be insoluble if it doesn't change when placed in water.
When introduced to water, soluble compounds typically form one continuous phase (eg when salt is added to water).
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