The energy formed in a system by the motion of particles is called kinetic energy. which is half of the product of the mass and volume
k.E = mv^2/2
When someone is riding on an amusement ride also known as a roller coaster, due to the nature of the turns and slope, energy will change from potential to kinetic energy and it will be repeated a couple of times throughout the course of the ride.
The energy stored in the system when it's at a rest is called potential energy, the energy is converted into kinetic energy. when it starts moving. The potential energy is stated as the product of the mass, height, and acceleration due to gravity.
Normally, the amusement ride vehicles will be pulled up from the first hill by a chain and as the other vehicles follow that route in climbing, and they will then gain potential energy
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Do the number of protons in an atom of an element always equals its atomic weight
Answer:
It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons.
Explanation:
Milk shake
Air in bottle
Concrete
Helium gas are the following what?
The following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture:
(a) a milkshake: heterogeneous mixture
(b) air in a bottle: homogeneous mixture
(c) concrete: heterogeneous mixture
(d) helium gas: element
What is a homogenous mixture?Whether a mixture is solid, liquid, or gaseous, homogeneous mixtures have the same ratios of their component constituents throughout a particular sample. Its composition stays the same throughout. There is just one observable phase of substance in a homogeneous mixture.
Is milk a homogeneous mixture?Due to the dispersion of fat particles throughout the milk and the fact that sugars are dissolved in the water portion, milk is used as an example of both a homogeneous mixture and a heterogeneous mixture.
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The complete question is -
Classify each of the following as an element, a compound, a
homogeneous mixture, or a heterogeneous mixture:
(a) helium gas:
(b) a milkshake:
(c) air in a bottle:
(d) concrete:
When ethanol is exposed to pbr3, followed by magnesium, then formaldehyde, and then aqueous acid, what is the resulting product?
When ethanol and pbr3 combine, bromoethane and phosphoric acid are created.
PBr3+3C2H5OH------>3C2H5Br+H3PO3
The chemical name for phosphorous tribromide is PBr3. It can be created by the interaction of red phosphorous with bromine and is a Lewis acid or electron deficient chemical that lacks a complete octet. This process is quite exothermic.
It is a colorless liquid mostly utilized for changing various alcohols into their corresponding alkyl bromides. The reaction is an inverted configuration bimolecular nucleophilic substitution reaction. Alkyl bromide is the main byproduct of this process.
Alcohol attacking phosphorous tribromide triggers this reaction's mechanism, which results in the substitution of an alcohol group for a bromine atom.
H H
| |
H -c-c-Br +Mg------> C2H5MgBr
| |
H H
CH3MgBr = (Grignard reagent compound )
We can add a single carbon atom to make a primary alcohol by reacting a Grignard reagent with formaldehyde.
_
CH3CH2MgBr+ H2C=O -------> CH3CH2CH2O ----->CH3CH2OH
AQUEOUS ACID: (taking HCL as not mentioned)
CH 3 CH 2 (OH) + HCl ------> CH 3 CH 2(Cl) + H 2 O
Reaction type: double replacement
resulting product: CH 3 CH 2 Cl
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Which molecule has the higher molar mass? which molecule would have the higher rate of effusion?
The rate of effusion and the square root of molar mass is inversely proportionate .
Which molecule could have the higher rate of effusion?The lighter a gas is, the quicker it will rave; the heavier a gas is, the quieter it will effuse. Of all the choices, helium (He) has the lowest molecular weight (atomic weight in this case), so it will have the most elevated rate of effusion.
The molar mass of nitrogen is more inferior than the molar mass of oxygen. Hence, the rate of effusion of nitrogen is more elevated than the rate of effusion of oxygen.
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A shiny piece of metal has a volume of 315 cm and a mass of 851 g. what is the density of the metal?
lauren makes an art piece using the densities of various liquids to create layers of colors. she first determines the density of each liquid. then she pours them into a glass container and watches them separate into layers. liquid density dish soap 1.03 g/ml honey 1.36 g/ml corn syrup 1.33 g/ml corn oil 0.91 g/ml water 1.00 g/ml what information did she need to find the density of each liquid? how did she calculate density? which liquid sinks to the very bottom, and which floats at the very top?
Lauren needs the information like mass of each substance respect to its volume in order to estimate the density of each liquid that creates the layers of colors.
DescriptionLauren can calculate density by the formula
Density = Mass/ Volume
According to the densities, the liquid that has a density less than that of water, it will float in water.
Whereas the objects or liquids that have a density more than that of water, it will sink to the very bottom.
Density of liquidsA liquid’s density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts.
A substance that is less dense than water will float if it is gently introduced to the water’s surface. Like a solid, a liquid’s density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter.
How dense is liquid, high or low?Liquids have particles that are closely spaced. Liquids have high densities because, although being randomly arranged, they are tightly packed.
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molecular views of the reactant solutions for a precipitation reaction are shown below (with ions represented as spheres and water molecules omitted): 1. which compound is dissolved in beaker a: [ select ] 2. which compound is dissolved in beaker b: [ select ] 3. name the precipitate when solutions a and b are mixed. [ select ] 4. what is the sum of the coefficients of the net ionic equation (enter a whole number such as 0, 1, 2, 3 etc.) [ select ]
1. Li2CO3 is dissolved in beaker A
2. CaCl2 is dissolved in beaker B
3. When A and B are mixed is a white colour precipitate is formed of
CaCO3.
4. The sum of the coefficients of the net ionic equation is 0.
What is precipitation reaction?
In a precipitation process, two soluble salts in aqueous solution mix, and one of the byproducts is an insoluble salt known as a precipitate.
The precipitate can be removed from the liquid by centrifugation, decantation, or filtration, or it can remain suspended in the solution and fall out on its own. The term "supernate" refers to the liquid that is left over after a precipitate occurs.
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asap!!! due today!!! is it right??
Answer: yes it is right.
Explanation:
Answer: Correct
Explanation:
identify all possible types of intermolecular forces that can form between particles of each substance below. (select all that apply.) (a) cs2 dipole-dipole interactions hydrogen bonding interactions ion-dipole interactions london dispersion forces (b) ch2br2
All possible types of intermolecular forces that can form between particles of :
(a) CS2: London dispersion forces
(b) CH2Br2: Dipole-dipole interaction and H-bonding
What are intermolecular forces?
Intermolecular forces, frequently abbreviated to IMF, are the appealing and repulsive forces that stand up among the molecules of a substance. These forces mediate the interactions among man or woman molecules of a substance. Forces additionally exist among the molecules themselves and those are together called intermolecular forces. Intermolecular forces are specifically answerable for the bodily traits of the substance. There are 5 varieties of intermolecular forces. They are as follows-
Dipole-Dipole InteractionsIon-Dipole InteractionsIon Induced Dipole InteractionsDipole Induced Dipole InteractionDispersion Forces or London ForcesThus, al the types of intermolecular forces possible between particles of :
(a) CS2: London dispersion forces
(b) CH2Br2: Dipole-dipole interaction and H-bonding
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calculate the equilibrium majority and minority carrier concentrations if the semiconductor is at room temperature.
Majority carrier concentration in a semiconductor is expressed as n0 = (ni)2/M, or Majority Carrier Electron Concentration = (Intrinsic Carrier Concentration)2/Minority Carrier Concentration.
What is equilibrium carrier concentration?
The equilibrium carrier concentration is the total number of carriers in the conduction and valence band. A constant is the result of minority and majority charge carriers. The equilibrium carrier concentration is defined as the total number of carriers in the conduction and valence bands without any external influence.
Majority carrier concentration in a semiconductor is expressed as n0 = (ni)2/M, or Majority Carrier Electron Concentration = (Intrinsic Carrier Concentration)2/Minority Carrier Concentration. It is defined as the equilibrium carrier concentration, which is equal to the intrinsic carrier concentration plus the number of free carriers added by doping the semiconductor.
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From a bag containing 5 nickels, 8 dimes, and 7 quarters, 5 coins are drawn at random and all at once. what is the probability of getting 2 nickels, 2 dimes, and 1 quarter? how many total electrons
The probability of getting 2 nickels, 2 dimes, and 1 quarter is; 0.1264
What is probability ?The area of mathematics known as probability deals with numerical descriptions of how likely it is for an event to happen or for a claim to be true. The probability of an occurrence is a number between 0 and 1, with 1 representing certainty and 0 representing impossibility of the event.
The higher the probability of an event, the more probable it is to occur. Tossing a fair (unbiased) coin is a straightforward illustration. Since there are no other possible outcomes and the coin is fair, the probability of both "heads" and "tails" is half. Since there are no other conceivable outcomes, the probability of either "heads" or "tails" is equal to one.
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0 the following electron configurations represent excited states. identify the element and write its ground-state condensed electron configuration.
The ground state is the lowest energy state of the atom.
What is the ground state configuration?We know that the electron configuration has to do with the manner in which electrons are arranged in an atom. The ground state is the lowest energy state of the atom. The atom could move to higher energy states by absorbing energy sometimes in the form of heat or light.
The ground state has to do with the lowest energy state of the atom and according to the Bohr theory, the atom could acquire energy and move from this lowest energy state to higher energy states. The higher energy states are short lived and the electron returns to the ground state.
We want to show the ground state of each of the atoms as shown in the question;
N - [tex]1s^{2} 2s^{2} 2p^{3}[/tex]
S - [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]
Rh - [tex]1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{1} 4d^{8}[/tex]
Thus, these are the ground state electron configurations of the nitrogen, sulfur, and rhenium atoms shown above respectively.
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Which element has similar properties to neon (Ne)? HELP ME PLS!
Explanation:
Krypton because it's inert gas
What is the name of N2CI4? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
The name of N2CI4 is Dinitrogen tetrachloride.
I determined the bond type because there was no metal in the formula, and I determined the name by taking the prefixes of the subscripts and adding them to the elements. Since both nitrogen and chlorine want to gain electrons. we can obey the octet rule with a compromise of neither losing nor gaining electrons.
Two atoms share electrons to achieve the octet rule and form a covalent bond. Accordingly, the indicated compounds are covalent compounds. Explain what is most likely to happen when an atom of this element approaches an atom with seven valence electrons. Move to the outermost shell. Because both fluorine and hydrogen can only form ionic bonds.
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questionyou heat two substances, a and b. both substances change color. when cooled, both substances return to their original colors.what most likely happened in this situation?
Two substances, a and b were heated. Both substances change color. when cooled, both substances return to their original colors.
What is a physical change and examples?Changes within the size or form of matter are examples of physical change. Physical changes include transitions from one state to a different , like from solid to liquid or liquid to gas. Cutting, bending, dissolving, freezing, boiling, and melting are a number of the processes that create physical changes.
Why it's a physical change?Physical changes occur when objects or substances undergo a change that doesn't change their chemical composition. This contrasts with the concept of chemical process in which the composition of a substance changes or one or more substances combine or break up to form new substances.
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how much water must be evaporated from 500 grams of a 10% salt solution to obtain a 15% salt solution?
The amount of water that must be evaporate from 500 grams of a 10% salt solution to obtain a 15% salt solution is: 166.67 g
To solve this problem, the formula and the procedure that we have to use is:
c1 * m1 = c2 * m2
Where:
c1= concentration of the concentrated solutionm1 = mass of the concentrated solutionc2 = concentration of the diluted solutionm2 = mass of the diluted solutionInformation about the problem:
c1 = 10%m1=500 gc2 = 15%m2= m1 - xAmount of water evaporate = xApplying the dissolution of concentrations formula, we get:
c1 * m1 = c2 * m2
10% * 500g = 15% * (500 g - x)
0.10 * 500g = 0.15*(500g - x)
50 g = 75g - 0.15x
Isolating the (x) variable, we have:
0.15x = 75g - 50 g
0.15x = 25g
x = 25g / 0.15
x = 166.67 g
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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what is the purpose of the aqueous sodium bisulfite solution that is added during the workup of the bromination reaction? group of answer choices to destroy the unreacted acetic acid to dry the organic phase during the workup procedure to generate a better electrophile to destroy the unreacted bromine
To destroy the unreacted Bromine :
Bromination of aniline is taken out in by reacting aniline with bromine and acetic acid. This reaction gives us in a tri-substituted product known as 2,4,6 tribromoaniline which is basically a white precipitate.
During Bromination reaction, Sodium Bisulfite may be added if there is any unreacted bromine left in the reaction combination. This is compulsory because lively Bromine can barge into the reaction because of bromine's oxidizing characterstics.
Sodium Bisulfite Solution is a reducing agent and it can change into unreacted bromine and bromate by force it into the bromide.
Moreover, Sodium bisulfite can also help in show the final color of the solution because of the bromine presence.
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Which formulas both represent compounds?
O H₂ and O₂
O CO₂ and H₂O
O H ₂ and CO₂
O O2 and H₂O₂
Answer:
CO2 and H2O
Explanation:
CO2 and H2O are both compounds
red gold is a gold‑copper alloy used to make jewelry. a piece of jewelry made of red gold weighs 9.47 g9.47 g and has a volume of 0.715 cm30.715 cm3 . gold has a density of 19.3 g/cm 319.3 g/cm3 and copper has a density of 8.96 g/cm 38.96 g/cm3 . calculate the percentage by mass of each metal in the jewelry. assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.
Red gold is a gold‑copper alloy used to make jewelry.
Red gold is an alloy created by combining pure gold and copper without any or very little silver.
Here the percentage by mass of gold
= (100/9.47) × 5.71832496
= 60.3835794 %
The percentage by mass of copper
= (100/9.47) × 3.75167504
= 39.6164207 %
The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.
What is red gold?
Red gold is an alloy created by combining pure gold and copper without any or very little silver.
Since gold is yellow—at least pure gold is—there is no such thing as red gold, the phrase "red gold" is truly an oxymoron.
A homogenous blend of two or more metallic elements is referred to as an alloy. Alloys are valuable because they can be designed to have unique properties that are impossible to achieve with pure metals. Silver and copper are the two ad metals that are used most frequently in gold alloys. In the past, the majority of gold alloys were composed of copper, silver, and all three metals, along with other trace metals. These mixes typically yield a pleasing yellow hue that resembles pure gold.
Let's assume the pieces of jewelry (weight 9.47g) contains X g gold and Y g copper.
Now according to the question,
X+Y = 9.47 .......... (1)
Again we know that, density= mass/volume
So,
X/19.3 + Y/8.96 = 0.715 ............. (2)
Or, X/19.3 = 0.715 - Y/8.96
Or, X = 13.7995 - 19.3Y/8.96
If we put the value of X in the equation (1). Then
13.7995 - 19.3Y/8.96 + Y = 9.47
Or, Y(19.3/8.96 - 1) = 4.3295
Or, Y = 4.3295 /1.15401786
Or, Y = 3.75167504
Now, from equation (1).
X+ 3.75167504 = 9.47
Or, X = 5.71832496
Here the percentage by mass of gold
= (100/9.47) × 5.71832496
= 60.3835794 %
The percentage by mass of copper
= (100/9.47) × 3.75167504
= 39.6164207 %
The pieces of jewelry ( weight 9.47g) contains 60.3835794 % Gold and 39.6164207 % copper.
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an individual takes in 2,000 ml of water during the day. ideally they should lose ml of water during the day.
An individual takes in 2,000 ml of water during the day. Ideally, they should lose 2,000 ml of water during the day.
What is Water?Water, with the chemical formula H₂O, is an inorganic, transparent, flavorless, odorless, and almost colorless liquid that makes up the majority of the Earth's hydrosphere as well as the fluids found in every known living thing.Despite not providing food, energy, or organic micronutrients, it is essential for all known forms of life. Its molecules are made up of two hydrogen atoms joined by covalent bonds and have the chemical formula H₂O.The liquid state of H₂O at standard pressure and temperature is referred to as "water" because the hydrogen atoms are joined to the oxygen atom at an angle of 104.45°.Water exists in a variety of natural conditions. It produces fog-like aerosols and precipitation in the form of rain.
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someone please help i don’t understand this
Answer: m = 179.4 g
Explanation:
Answer:
26.5385
Explanation:
Which pair of atoms have similar properties?
a. mg and br
b. li and be
c. cl and br
d. f and he
e. li and f
Cl and Br have similar properties as they belong to halogen family.
What is halogen family?Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VII A) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and (Ts). They were given the name halogen, from the Greek roots Hal- (“salt”) and -gen (“to produce”), because they all produce sodium salts of similar properties, of which sodium chloride—table salt, or halite—is best known.
Because of their great reactivity, the free halogen elements are not found in nature. In combined form, fluorine is the most abundant of the halogens in Earth’s crust. The percentages of the halogens in the igneous rocks of Earth’s crust are 0.06 fluorine, 0.031 chlorine, 0.00016 bromine, and 0.00003 iodine. At and Ts do not occur in nature, because they consist of only short-lived radioactive isotopes.
Chlorine is the best known of the halogen elements. The free element is widely used as a water-purification agent, and it is employed in a number of chemical processes. In the past ethylene dibromide was extensively used as an additive in.
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the relationships among which variable quantities are expressed by the ideal gas law equation?(1 point)
The relationships among the variable quantities pressure 'P', volume 'V', number of moles 'n', and absolute temperature 'T' expressed by the ideal gas law equation.
The ideal gas law -
Ideal gas - It is a speculative or hypothetical gas with independent behavior of attractive forces and repulsive forces. It can be described by the ideal gas law completely. This is not possible in real life. But it might be possible under high pressure and high temperature.
The ideal gas law is an equation which expresses the relationship among variable quantities namely pressure, volume, number of moles and absolute temperature. It can also be called a general gas equation.
The ideal gas equation is :
PV = nRT
where,
P = pressure,
V = volume,
n = number of moles / amount of substance
R = Ideal gas constant (It is a constant with definite value and not a
variable)
T = absolute temperature
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Which of the following is a heterogeneous mixture?
a
sugar
b
sugar in water
c
samples of nitrogen and oxygen gases in the same container
d
samples of gaseous argon and solid iron in the same container
Answer: samples of gaseous argon and solid iron in the same container
examine the following order of elution of compounds containing certain functional groups from fastest to slowest, and indicate which mistake has been made.hydrocarbons, olefins, ethers, amines, ketones, aldehydes, esters, alcohols, aromatics, and carboxylic acidsamines and aromatics are switched.ethers and esters are switched.alcohols and aromatics are switched.aromatics and esters are switched.aldehydes and esters are switched.
The Elution sequence of compounds containing certain functional groups from the fastest to the slowest is hydrocarbons, olefins, ethers, halo carbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.
Elution:
Elution in organic and analytic chemistry refers to the process in which one material is extracted from another material by washing it with the help of a solvent.
In an elution sequence, regardless of the polarity of the compounds, the solvent which is more polar, its chemicals elutes faster. Therefore, amending the polarity of the solvent will not change the order of elution of compounds. It might seem contradictory as a polar solvent seems to convey polar compounds beyond the non-polar compounds.
Contemplating the solvents and the chemicals will fight for the stationary phase locations conductive to help us visualize the intention. Slow elution would be created by the molecules which were remained to attach to the stationary phase due to poor ability of a less polar solvent to compete. Molecules and a polar solvent successfully asserted for the stationary phase locations.
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If you put a scale in an elevator and weigh yourself as you go up and then go back down, does the scale give you the same number for both up and down? Explain your answer.
Yes, despite of how high or low you are, gravity exerts a force on you that can be measured.
Briefing:The weight appears to grow as the individual moves upward because the weight scale's usual force on them increases. When the elevator descends, the opposite is true.
What is a weighing scale?Weight is determined by the force applied to the load cell of weighing scales and balances. They then translate the outcome into mass and present it in several mass units.
What use does a weighing scale function?An instrument used to calculate an object's weight or mass is a weighing balance. It is a necessary equipment in laboratories, commercial kitchens, and pharmacies and is offered in a variety of sizes with various weighing capacities.
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If 6.3 g of butanoic acid, c4h8o2, is dissolved in enough water to make 1.0 l of solution, what is the resulting ph? look up the
You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).
5.9/88 = mol butanoic acid = 0.067…mol
so [C4H8O2] = 0.067… mol/L ([ ] conc in mol/L)
Ka = [H+][C4H7O2-] /[[C4H8O2] ] assume
[H+] at eqm = [C4H7O2-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it hardly dissociates)
then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.
gives an ans of 3.00 to 3sf
What is acid?
Atomicity, consistency, isolation, and durability (ACID) is an acronym and mnemonic for the four key characteristics that a transaction manager ensures for every transaction (which is also called a transaction monitor). These qualities include atomicity.
Therefore,
You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).
5.9/88 = mol butanoic acid = 0.067…mol
so [C4H8O2] = 0.067… mol/L ([ ] conc in mol/L)
Ka = [H+][C4H7O2-] /[[C4H8O2] ] assume
[H+] at eqm = [C4H7O2-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it hardly dissociates)
then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.
gives an ans of 3.00 to 3sf
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Answer:
You need the Ka value of butanoic to do this (Ka = 1.51 x 10^-5).
5.9/88 = mol butanoic acid = 0.067...mol
so [C4H8O2] = 0.067... mol/L ([] conc in mol/L)
Ka = [H+][C4H702-]/[[C4H8O2]] assume
[H+] at eqm = [C4H702-] at eqm and [C4H8O2] at
eqm is same as acid originally (fair assumption as it hardly dissociates)
then [H+] = sqroot of Ka[C4H8O2] and the pH is the -log of this.
gives an ans of 3.00 to 3sf
What is acid?
Atomicity, consistency, isolation, and durability (ACID) is an acronym and mnemonic for the four key characteristics that a transaction manager ensures for every transaction (which is also called a transaction monitor). These qualities include atomicity.
Therefore,
You need the Ka value of butanoic to do this (Ka =
1.51 x 10^-5).
5.9/88 = mol butanoic acid = 0.067...mol
so [C4H802]=0.067... mol/L ([] conc in mol/L)
Ka = [H+][C4H702-]/[[C4H8O2]] assume
[H+] at eqm = [C4H702-] at eqm and [C4H8O2] at eqm is same as acid originally (fair assumption as it
hardly dissociates)
then [H+] = sqroot of Ka[C4H8O2] and the pH is the
-log of this.
gives an ans of 3.00 to 3sf
air at 40c and 2 atm is passed through a shallow bed of napthalene spheres 12 mm in diameter at a rate of 2 m/s based on the empty cross section onto the bed
Airat 100ºF and 2 atm is passed through a shallow bed ofnaphthalene spheres ½ in. in diameter at rate of 5 ft/s, based onthe empty cross sectionof the bed.
What is of naphthalene?The simplest polycyclic aromatic hydrocarbon, naphthalene is an organic chemical with the formula It is a white crystalline solid with a distinctive odor that may be detected at concentrations as low as 0.08 ppm by mass. The structure of naphthalene is a fused pair of benzene rings, making it an aromatic hydrocarbon. The primary component of conventional mothballs is what makes it most well-known.
Two distinct accounts from the early 1820s mentioned a white solid produced by the distillation of coal tar that had a strong odor. In 1821, John Kidd cited these two disclosures and went on to discuss many of the qualities and methods of manufacturing of this drug. He suggested calling it naphthaline.
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what will be the effect on the amount of gas produced if the experiment is repeated using 0.35 g of k(s) instead of 0.35 g of li(s) ?
The effect on the amount of gas produced is that if the experiment is repeated using 0.35 grams of potassium is that less amount of hydrogen gas is liberated.
What is relation between amount of gas and metal used ?When potassium reacts with water it liberates hydrogen gas and potassium hydroxide is formed.
[tex]2K+3H_2O\rightarrow2H_2+2KOH[/tex]
When lithium reacts with water it liberates hydrogen gas and lithium hydroxide is formed.
[tex]2Li+3H_2O\rightarrow2H_2+2LiOH[/tex]
Moles in case of each reaction can be calculated by the formula ,
n=W/M
where W =mass and M=molar mass
therefore, moles of potassium are ,0.35 g/39=0.0089
and moles of lithium are,0.35 g/6.9=0.0507
Since the amount of moles produced when lithium metal is used is more as compared to potassium ,lithium will produce more gas.Thus,on replacing lithium with potassium less gas will be produced.
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Which transformation could take place at the cathode of a voltaic cell?
a. haso2
b. cr2 to cr2o72-
c. h2o to o2
d. f- to f2
e. none of the other answers could take place at the cathode.
The transformation could take place at the cathode of a voltaic cell is (d) F- to F2.
What is a voltaic cell?
Electrons can move from one reaction to the other thanks to a wire that connects the two processes. We have therefore produced a voltaic/galvanic cell. A voltaic cell, often called a galvanic cell, is an electrochemical device that produces electricity through uninhibited redox processes. It is divided into two distinct half-cells.
A polarised electrical device's cathode is the electrode from which a regular current exits. The abbreviation CCD, which stands for Cathode Current Departs, might be used to remember this definition. Positive charges move in the direction described by a conventional current.
The transformation could take place at the cathode of a voltaic cell is (d) F- to F2.
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