Explanation:
thermal changes are those in which heat exchange is involved like endothermic and exothermic
while in chemical changes collision between the reactant occurs which result into product
Which stage in the life cycle of a plant is represented in this picture?
Answer:
seed, sprout, small plant, and adult plant.
Explanation:
I didnt see the picture so I cant tell you what stage it represented but I told you all the stages of plants in life cycle.
When you created hypotheses to guess whether each chemical was an acid or base, what specifically did you look for in the chemical formulas?
While assigning a term for a chemical to be an acid or base we have to look for the [tex]H^{+}[/tex] ions that can be donated by a chemical formulas or [tex]OH^{-}[/tex] ions for the basic , When you created hypotheses to guess whether each chemical was an acid or base,
To determine whether a substance is an acid or base , count the hydrogen on each substance before and after the reaction . If the number of hydrogens has decreased the substance is the acid ( donates hydrogen ions ) . If the number of hydrogens has increased that substance is the base ( accepts hydrogen ion )
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An average speed for a time interval is 40 km/hr. Which is the correct time interval?
(2,20) to (4,100)
(2,20) to (4,80)
(2,20) to (3,100)
(1,20) to (3,80)
The correct time interval is (2,20) to (4,80).
What is the average velocity?The average velocity is defined as the velocity or speed of the body throughout the period of motion under consideration. This will always span the entire journey. Recall that velocity is the ratio of distance covered to time taken. The average velocity spans the entire journey and differs from the instantaneous velocity which occurs at a particular point along the journey.
Now we know that the average distance is obtained as the sum of the initial and final velocity multiplied by time and divided by two. Bear in mind that the question already contains the information that we have been told that the average velocity here is 40 km/hr. We can clearly see from the forgoing that the correct time interval is (2,20) to (4,80).
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In 2021 the James Webb Telescope will begin operation focusing on infrared wavelengths and must be kept extremely _______.
In 2021 the James Webb Telescope will begin operation focusing on infrared wavelengths and must be kept extremely cold.
What is James Webb Telescope?The James Webb Telescope is the most important optical telescope present in space, which is employed by astronomers to observe celestial bodies and physical phenomena in the universe.
This space telescope (James Webb Telescope) is based on the infrared wavelengths that cover a specific length of 0.57 to 28-micrometer waves and enable to observe different spectra across the Universe.
In conclusion, in 2021 the James Webb Telescope will begin operation focusing on infrared wavelengths and must be kept extremely cold.
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Select the correct answer from each drop-down menu. how does the equilibrium change to counter the removal of a in this reaction? a b ⇌ ab the equilibrium . simultaneously, there’s an increase in the reaction.
a b ⇌ ab
The equilibrium Shifts left simultaneously, there’s an increase in the Reverse reaction.
When the addition of the reactant in reaction system then the equilibrium will shift to the right (forward) direction of the reaction.
What happens if the equilibrium shifts to the right?
The overall reaction will shift in a way that reduces the system's stress. Therefore, if one of the reactants is under more stress, the equilibrium will move to the right to eliminate some of that reactant.What does it mean when equilibrium lies to the left?
Yes, "to the left" does relate to a balance expression's left side.When we say that an equilibrium is "to the left," we mean that the educt or reactant is preferred, meaning that there is more H2O present than H3O+ or OH.
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What compound exhibits only two signals in its 1h nmr spectrum, a triplet and a quintet (splitting of 5)?
BrCH2CH2CH2Br exhibits only two signals in its 1h NMR spectrum, a triplet and a quintet (splitting of 5)
NMR spectrum:Detail information about the structure, dynamics, reaction state, and chemical environment of molecules is provided by NMR spectroscopy.Proton and carbon-13 NMR spectroscopy are the two most popular types of NMR, but it can be used with any sample that has nuclei with spin.What can we observe from 1h nmr spectrum?The x-axis in the NMR spectrum is the chemical shift in ppm. Along with splitting pattern, coupling constant, and integral regions.What does triplet in nmr mean?A split signal in NMR spectroscopy is made up of three lines that are near together. The lines' heights will resemble a 1:2:1 ratio. Imaginary triplet. lines that are spaced 1:2:1.What does quintet mean in nmr?A split signal in NMR spectroscopy is made up of five closely spaced lines. The lines' heights will be roughly 1:4:6:4:1 in proportion.To learn more about nmr spectrum visit:
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best answer gets marked as brainliest! list all of the properties of stainless steel spoon
Answer:
- Corrosion resistant
- High tensile strength (the maximum stress that a material can withstand while being stretched or pulled before breaking)
- Temperature resistant
- Easy formability and fabrication
- Low maintenance (long lasting)
- Attractive appearance
- Environmentally friendly (recyclable)
Answer:
See below
Explanation:
I suppose you could include these properties:
Specific heat = .5 J/g-C
Density =~ 7500 kg/m^3
melting point approx 1500 ° C
among others .....
A chemist measures the solubility of lead(ii) bromide in water to be 2. 96 g/l. calculate the ksp value for the solid. the ksp value is ___________. group of answer choices
The solubility product, ksp of PbBr₂ is 2.102 × 10⁻⁶
What is solubility?The solubility of a solute is defined as the maximum amount of that solute that can be dissolved in a known quantity of solvent at a given temperature.
What is a solubility product?Some salts are sparingly soluble in a solvent. For them, we calculate the solubility product.
It is an equilibrium constant that defines the relationship between a solid and its respective ions in an aqueous solution in equilibrium.
The greater the solubility product, the greater the solubility and vice versa.
Here, the solubility of PbBr₂ = 2.96 g/l
Molar solubility of PbBr₂ = [tex]\frac{2.96}{molar mass of PbBr_2}[/tex] = 2.96/367 = 8.07 × 10⁻³
At equilibrium,
[tex]PbBr_2\rightarrow Pb^{2+} + 2Br^-[/tex]
1 mole of PbBr2 dissociates into 1 mole of Pb²⁺ ions and 2 moles of Br⁻
Let the molar concentration of Pb²⁺ be x, then the molar concentration of Br⁻ is 2x
Ksp = x.(2x)²
= 4x³
Substitute, x = 8.07 × 10⁻³
Ksp = 4 (8.07 × 10⁻³)³
= 2.102 × 10⁻⁶
Thus, The ksp of PbBr₂ is 2.102 × 10⁻⁶
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The kb of hypochlorous acid is 3. 0×10^–8 at 26. 0 C. What is the percent of ionization of hypochlorous?
The acid dissociation constant (Ka) defines the difference between a weak and a strong acid. The % ionization of hypochlorous acid is 0.14%.
What is the acid dissociation constant?The acid dissociation constant is used to define the ionization constant of an acidic substance. It gives the quantitative measurement of the strength.
The ICE table is attached to the image below.
The acid dissociation constant (Ka) for the reaction is,
Ka = [H⁺][ClO⁻] ÷ [HClO]
= a² ÷ (0.015 - a)
= 3.0 x 10⁻⁸
Now, a² + 3.0 x 10⁻⁸ a - 4.5 × 10⁻¹⁰ = 0
So, a = 2.210 × 10⁻⁵
Solving further,
[H+] = a = 2.210 × 10⁻⁵ M
The percent ionization is calculated as,
[H+] ÷ [HClO] × 100
= 2.210 × 10⁻⁵ M ÷ 0.015 × 100
= 0.14 %
Therefore, 0.14 % is the percentage of hypochlorous ionization.
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Your question is incomplete, but most probably your full question was, The ka of hypochlorous acid (HClO) is 3.0 x 10⁻⁸ at 25.0°C. What is the % of ionization of hypochlorous acid in a 0.015 aqueous solution of HClO at 25.0C?
Cis-platin is a chlorine-containing chemotherapy agent with the formula pt(nh3)2cl2. What is the mass of one mole of cis-platin?
Cis-platin is a chemotherapy agent used to treat and kill cancerous cells in patients. One mole of cis-platin has a mass of 300.06 grams/mol. Thus, option B is correct.
What is a chemotherapy agent?A chemotherapy agent is an alkylating agent that is used to treat cancer and is given to reduce the infection or to relieve the symptoms. Cis-platin (Pt(NH₃)₂Cl₂) is one of the chemotherapy agents that treat lung, ovarian, and neck cancer, etc.
The mass of one mole of Cis-platin is calculated as,
Moles = mass ÷ molar mass
Where,
Moles = 1 mole
The molar mass of (Pt(NH₃)₂Cl₂) is calculated as,
195.06 g/mole + 2(17g/mole) + (35.5)2 = 300.06 grams
Substituting values to calculate mass:
Mass = Molar mass × moles
= 300. 06 × 1
= 300.06 grams/mol
Therefore, option B. 300.06 gm/mol is the mass of Cis-platin.
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Your question is incomplete, but most probably your full question was, Cis-platin is a chlorine-containing chemotherapy agent with the formula pt(nh3)2cl2. What is the mass of one mole of cis-platin?
488.91 g/mol 300.06 g/mol492.37 g/mol283.02 g/mol2860.5 g/molHow will you recognize that a single replacement reaction has occured when you combine an active metal with 6m hcl?
A single replacement or displacement reaction occurs when one ingredient in a compound replaces another. Only another metal can replace a less active one; a metal can only displace another metal, and a non-metal can only displace another non-metal.
Displacement reaction:The tendency of the element to lose electrons is what makes it metallic. Due to their bigger sizes and propensity to lose electrons as size, the number of shells, and nuclear force of attraction rise, the most active metals are found on the left side of the periodic table.
The reaction in which the more reactive element displaces the less reactive element is known as the displacement reaction.
When we combine an active metal with HCl, the reaction is as follows:
We are taking sodium, Na which is the most active metal. It will replace H in HCl because it is more reactive than H.
2Na + 2HCl → 2NaCl + H₂
Three ways to recognize if a single displacement reaction has taken place:
1. Color change
2. Formation of bubbles (a gas)
3. Formation of a precipitate
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Balance the equation for a half-reaction that occurs in acidic solution. use e− as the symbol for an electron. equation: p_{4} -> h_{3}po_{4} p4⟶h3po4
The balance the equation for a half-reaction that occurs in acidic solution is given as,
[tex]P_{4}+16H_{2} O+20e^{-}[/tex] → [tex]4H_{3}PO_{4}+20H^{+}[/tex]
The half-reaction method to balance redox reactions in acidic aqueous solutions follows rule.
Balance elements in the equation other than O and H.Balance the oxygen atoms by adding the appropriate number of water opposite side of the equation.Balance the hydrogen atoms by adding proton ions ( [tex]H^{+}[/tex] ion) to the opposite side of the equationAdd up charge on each side of the equation by adding enough number of electrons to more positive side.The [tex]e^{-}[/tex] on each side must be equal . Multiply by appropriate integers if they are nit equal.The half -equation are added together, by cancelling out the electrons to form one balanced equation.learn about half-reaction
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Which law states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its individual gases?.
Dalton's law of partial pressures
The total pressure by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases.
What is John Dalton's law ?Dalton's law, which states that a gas mixture's overall pressure is equal to the sum of its component gases' partial pressures. The pressure that each gas would produce if it occupied the same volume of the mixture by itself at the same temperature is known as the partial pressure.
The pressure that each gas would produce if it occupied the same volume of the mixture at the same temperature alone is referred to as the partial pressure.Learn more about Dalton's law here:
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Perform the following operationand express the answer inscientific notation.7.00x10^5 - 5.00x10^4
Taking into account the scientific notation, the result of the subtraction is 6.5×10⁵.
Scientific notationFirst, remember that scientific notation is a quick way to represent a number using powers of base ten.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Subtraction in scientific notationYou want to subtract two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is 5.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 5.00×10⁴=0.500×10⁵
Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:
7.00×10⁵ - 0.500×10⁵= (7.00- 0.500)×10⁵= 6.5×10⁵
Finally, the result of the subtraction is 6.5×10⁵.
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Determine the number of nh4 nh4 and co32−co32− ions required to form a neutral ionic compound
The number of NH₄⁺ NH₄⁺ and CO₃⁻² CO₃⁻² ions required to form a neutral ionic compound are 2 and 1 respectively.
A Neutral Ionic Compound means a compound that is made by both positively and negatively charged ions i.e. cations and anions respectively.
NH₄⁺ is called as Ammonium ion formed due to addition of H+ (Proton) in Ammonia and CO₃⁻² is called as Carbonate ion formed with a Trigonal Planar structure.
For a compound having NH₄⁺ and CO₃⁻², a neutral compound can be made by keeping the total charge on the compound to be zero.
Hence, Ammonium carbonate (NH₄) ₂CO₃ is a neutral compound formed by taking 2 NH₄⁺ and 1 CO₃⁻² ions.
So, for the formation of the Neutral compound i.e. Ammonium carbonate (NH₄) ₂CO₃ , 2 NH₄⁺ and 1 CO₃⁻² is needed.
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How many moles of helium gas would it take to fill a balloon with a volume of 1000.0 cm 3when the temperature is 32 o C and the atmospheric pressure is 752 mm Hg?
The number of moles of the gas is 0.0396 moles.
What is the ideal gas equation?The ideal gas equation is used to determine the relationship between the variables; temperature, pressure, volume and the number of moles of a gas. We know that the gas laws are used to understudy the parameters that has to do with gases.
Thus;
Volume = 1000.0 cm 3 or 1 L
Gas constant = 0.082 atmLK-1Mol-1
Temperature = 32 o C + 273 K = 305 K
Pressure = 752 mm Hg or 0.99 atm
Thus;
PV = nRT
n = PV/RT
n = 0.99 atm * 1 L/0.082 atmLK-1Mol-1 * 305 K
n = 0.0396 moles
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A 0. 150 amp current is run through a solution of ni2 ions for 12. 2 hours. what mass of metal is deposited on the cathode?
The mass of nickel metal deposited on the cathode is 2.004 g.
What is electrolysis?When an ionic compound is decomposed into its elements by passing a direct electric current using a compound in its liquid form. The process is known as electrolysis.
At the cathode, cations are reduced and at the anode, anions are oxidized.
The main components used in the process of electrolysis are
electrolyte, electrodes,external power sourceCurrent passed through the solution, I = 0.150 A
Time, t = 12.2 hrs = 12.2×60×60 = 43920 sec
Charge, q = It = 0.150 × 43920 = 6588 C
At cathode,
[tex]Ni^{2+}(aq) + 2e^- \rightarrow Ni(s)[/tex]
Nickel metal deposited by (2×96487 C) = 58.7g
Nickel metal deposited by 6588 C = [tex]\frac{58.7 \times 6588 }{2\times96487}[/tex] = 2.004 g
Hence, The mass of nickel metal deposited on the cathode is 2.004 g.
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Calculate the frequency of light having a wavelength of 425nm. remember that 1nm=1×10−9m
The frequency of light having a wavelength of 425nm will be 70588 × [tex]10^{14} Hz[/tex].
The count of times an event takes place per unit of time is known as its frequency. The word frequency would be most frequently used to describe waves in physics including chemistry, including light, sound, including radio waves. The frequency refers to the number of times during one second that a point on a wave crosses a fixed reference point.
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places in the consecutive cycles.
Given data:
wavelength = 425nm = [tex]425 * 10^{-9} m[/tex]
Frequency can be calculated by using the formula;
Frequency = speed of light / wavelength
Frequency = 3 × [tex]10^{8} m/s[/tex] / 425 × [tex]10^{-9} m[/tex] = 7,0588 × [tex]10^{14} Hz[/tex].
Therefore, the frequency of light having a wavelength of 425nm will be 70588 × [tex]10^{14} Hz[/tex].
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sketch two amino acids side by side
The sketch of two amino acid side by side is given above.
What is amino acid?Amino acid is defined as the acid which contains two functional groups which are carboxylic group, -COOH and ammine group, -NH2.
When the two or more than two molecules of amino acids join together by forming peptide bond, they produces polypeptide chain or protein.
What is peptide bond?The bond which is present inbetween two amino acid is called a peptide bond.
The peptide bond is defined as a chemical bond which is formed inbetween the two or more molecules when nitrogen which is present in one amino acid react with the carbon of another amino acid by releasing a molecules of water.
Thus we concluded that the two amino acid bond by forming peptide bond.
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Calculate the molarity of the two solutions. The first solution contains 0.650 mol of NaOH in 1.35 L of solution.
Answer:
0.481 M
Explanation:
The molarity ratio looks like this:
Molarity = moles / volume (L)
Since you have been given both the mass and volume, you can plug them into the equation to find the molarity.
Molarity = moles / volume
Molarity = 0.650 moles / 1.35 L
Molarity = 0.481 M
What type of bond is joining the two hydrogen atoms?
a. two hydrogen atoms sharing a pair of electrons.
b. covalent hydrogen hydrophobic ionic hydrophilic
Covalent hydrogen bond is joining the two hydrogen atoms.
The simplest material with a covalent hydrogen bond is the hydrogen molecule. Two hydrogen atoms, each with one electron in a 1s orbital, combine to produce it. The two electrons in the covalent link are shared by both hydrogen atoms, and each one takes on an electron configuration like that of helium.The hydrogen atom's single electron shell, which contains space for two electrons, is where the electrons are located. The same nature of the hydrogen atoms prevents either from stealing an electron from the other in order to complete its own electron shell and create an ionic bond. The two electrons are thus shared by the two hydrogen atoms in a covalent link.learn more about Covalent hydrogen bond here: https://brainly.com/question/20607646
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What is the value of for this aqueous reaction at 298 k? a b↽−−⇀c dδ°=20. 46 kj/mol
The value for this aqueous reaction at 298 k? a b↽−−⇀c dδ°=20. 46 KJ/mol is 9.91 mol. in equilibrium
What is an aqueous reaction in equilibrium?When a chemical reaction happens at the liquid state and the formation of reactant and product is the same then the reaction is known as an aqueous reaction in equilibrium denoted by K.
δG = − R T ln
R = universal gas constant 8.313
δG= 20. 46 kj/mol
T = 298 k or 24.4 in celcius.
substituting the value in the equation.
20. 46 kj/mol = 8.313 × 24.4 in celcius × K
K = 8.313 × 24.4 in celcius / 20. 46 kj/mo
k = 9.91 mol .
Therefore, The value of this aqueous reaction at 298 k? a b↽−−⇀c dδ°=20. 46 KJ/mol is 9.91 mol. in equilibrium
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Disadvantages of evaporation
Answer: The main disadvantages of evaporation are high capital, energy and maintenance costs; large size of apparatus; enhanced temperatures; corrosion problems; and scaling or foaming.
Explanation:
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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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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100 POINTS - is air trapped in a jar a compound, element, homogeneous mixture or heterogeneous mixture
Answer:
homogenous mixture
Explanation:
homogenous mixtures appear in one phase and have even particle distribution.
Answer:
Air is indeed a homogeneous mixture of dinitrogen, dioxygen, carbon dioxide and a few other gases. All of the gases are in the same phase, and thus constitute a homogeneous mixture.
Explanation:
hope it helps you50 examples word equation with balanced chemical equarion
A chemist combined 0.440 L of an unknown calcium solution with an excess of ammonium chromate. This resulted in the precipitation of calcium chromate. The mass of the precipitate was 346.7 mg. What was the molar concentration of Ca2 in the original sample
The concentration of the original calcium ions is 0.005 M
What is concentration?The term concentration has to do with the amount of substance in solution. We know that the concentration can be measured in a lot of units such as mole/litre, grams per litre, percentage and so on.
As such we have the equation;
Ca^2+(aq) + (NH4)2CrO4(aq) --------> CaCrO4(s) + 2NH4^+(aq)
Number of moles of the precipitate = 346.7 * 10^-3 g/156 g/mol
= 0.0022 moles
Now;
1 mole of Ca^2+ produces 1 mole of CaCrO4 hence 0.0022 moles of CaCrO4 was produced by 0.0022 moles of CaCrO4.
Given that the volume of the solution is 0.440 L, the concentration of the solution is; 0.0022 moles/0.440 L
= 0.005 M
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The compound
is classified as a
The compound is classified as a secondary amine
Two organic substituents (alkyl, aryl, or both) are bonded to the nitrogen together with one hydrogen in secondary amines. Dimethylamine is a significant representation, while diphenylamine is an example of an aromatic amine. Secondary amines are amines that have two alkyl or aryl groups in place of the two hydrogen atoms of ammonia.
The molecule is methylpropylamine, a secondary amine because the nitrogen atom has both a methyl group and a propyl group. Compared to primary amines, secondary amines are more basic. The NH2 group is joined to the electron-withdrawing C6H5 group in aromatic amines. As a result, there are fewer single electron pairs available on N. Alkyl amines are hence more basic than aromatic amines.
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Aspirin is the common name for acetyl salicylic acid, C9H8O4. One tablet contains 0. 325 g of aspirin. How many moles of aspirin is this?
Answer:
.0017952905 mol
Explanation:
I hope this helps, I can't promise I got it right, please let me know haha!