The pH of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in 250ml of water is 17.
When barium hydroxide is dissolved in water, it forms,
Ba(OH)₂ → Ba⁺ + 2OH⁻
the concentration of the hydroxide ion in the solution will be,
Molarity = Moles of solute/volume of solution
Moles of Ba(OH)₂ = 2 moles of OH⁻
So, we can write,
0.10/171.3x2 =Moles of OH⁻
Moles of OH⁻ = 0.000291 moles.
Molarity of OH⁻ solution = 0.000291 x 1000/250
Molarity/concentration of OH⁻ solution = 0.001 mol/L
pH = 14 - p[OH]
p[OH] = log[0.001]
p[OH] = -3
pH = 14+3
pH = 17
So, the pH of the solution is 17.
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How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM spectrum, contain?
The photons have been calculated to contain about 4.97 * 10^-47 J/mol of energy.
What is the energy?We know that a photon is a unit of light. Better put, we can see the photon as a bundle of light and we are able to obtain the energy of that bundle of light as we can see.
Given that;
E = hf
E = energy of the photon
h = Plank's constant
f = frequency of the photon
Then
E = 6.6 * 10^-34 Js * 4.53 x 10^10 s-1
E = 2.99 * 10^-23 J
A mole would have to contain about 6.02 * 10^23 molecules so;
Energy per mole = 2.99 * 10^-23/6.02 * 10^23
= 4.97 * 10^-47 J/mol
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Missing parts;
How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM
spectrum, contain? Assume the microwave has a frequency of 4.53 x 1010 s-1. Your answer should
have 3 significant figures.
9. Which of the following are diatomic elements?
Bromine
lodine
Boron
Hydrogen
How many equivalence points will a titration between sodium hydroxide and acetic acid have?.
A titration between sodium hydroxide (NaOH) and acetic acid (CH₃COOH) will have two equivalence points. The first equivalence point will be when the acid is completely neutralized, and the second will be when the base is completely neutralized.
The first equivalence point occurs when the moles of sodium hydroxide (NaOH) is equal to the moles of acetic acid(CH₃COOH). In the titration sodium hydroxide has neutralized all of the acetic acid. The second equivalence point occurs when the moles of sodium hydroxide is equal to the moles of water. The reason for two equivalence points is that acetic acid is a weak acid and water is a strong base.
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heat is transferred at a rate of 2 kw from a hot reservoir at 725 k to a cold reservoir at 300 k. calculate the rate at which the entropy of the two reservoirs changes. (round the final answer to six decimal places.) the rate at which the entropy of the two reservoirs changes is kw/k. is the second law satisfied?
the rate at which the entropy of the two reservoirs changes is 0.00390837931 kw/k .
What is entropy ?
Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from molecular motion, the amount of entropy is a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.
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15) in ketose sugars, ring formation can occur because the ketone group reacts reversibly with a hydroxyl group in an aqueous solution. this process is termed . a) hemiacetal formation b) hemicarbation c) mutarotation d) a and c only e) a and b only
in ketose sugars, ring formation can occur because the ketone group reacts reversibly with a hydroxyl group in an aqueous solution. this process is termed " mutarotation".
A shift in the homeostasis between distinct anomers inside the solution causes mutarotation, which is a variation in the specific rotation with plane-polarized light. A hemiketal and hemiacetal group is required for any molecule to exhibit mutarotation. The earliest known example of mutarotation occurred in sugar.
When the matching stereocenters likely to recidivate, the equilibrium among two anomers changes, causing the optical rotation to change. This is known as mutarotation. The interconversion of the and anomeric forms causes the rotation of cyclic sugars.
Therefore, the correct answer will be option (C)
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From XNH,(g) + YO₂ g → ZNO(g), + QH₂O (g) the value of Z is
please guys...I need help asap....
Answer:
4
Explanation:
describe the experimental method through which you determine the appropriate wavelength for an analyte
Wavelength is chosen by analyzing the spectrogram.
Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave.
A spectrogram gives a going for walks show of a sound signal because it takes place in real time, a spectrum, however, offers us a photograph of the sound at a particular factor in time. A spectrum can permit you to see.
Spectrograms map out sound in a comparable way to a musical rating, only mapping frequency rather than musical notes. Seeing frequency energy allotted over the years in this manner allows us to genuinely distinguish each of the sound factors in a recording, and their harmonic shape.
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does a reaction occur when aqueous solutions of potassium nitrate and copper(ii) sulfate are combined?
Yes, the reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate happens when they are combined giving products by a reaction called double displacement reaction.
What is double displacement reaction?
Double displacement reaction is also called as double displacement exchange. This happens when some parts of 2 ionic compounds which are reacting are exchanged between them, making 2 new compounds. The positive and negative ions swap their places between the reactants in this reaction.
The reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate give 2 products that is copper nitrate and potassium sulfate. This reaction is known as double displacement reaction.
Balanced chemical equation:
2KNO3 + CuSO4 ----> Cu(NO3)2 + K2SO4
Therefore, the reaction between aqueous solutions of potassium nitrate and copper(ii) sulfate is possible and it gives products like copper nitrate and potassium sulfate making it a double displacement reaction.
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Neon has eight valence electrons in its outer shell. This means it does not easily react with other elements, as it has a full octet. Which other element behaves similarly?
Answer:
Any of the noble gasses, eg xenon.
Explanation:
All noble gasses have full outer shells of electrons which means they are very unreactive.
How many ml of a 14.0 m nh3 stock solution are needed to prepare 200 ml of a 4.20 m dilute nh3 solution?
60 ml of a 14.0 M NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.
Using the formula given below ,
M₁ x V₁ = M₂ x V₂
M₁ = concentration of stock solution
V₁ = volume of stock solution (to be found out)
M₂ = concentration of diluted solution
V₂ = volume of diluted solution;
V₁ = (M₂ x V₂) / M₁
= (4.2 x 200) / 14
= 60ml
Hence , 60 ml of a 14.0 Mole NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.
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Name the following bonds:
1. calcium
2. rubidium iodide
3. nickel (IV) selenide
Answer:
Ionic bondIonic bondIonic bondExplanation:
1) Calcium = ?
→ Ca will constitute to form ionic bond.
2) Rubidium iodide = ?
→ Rubidium iodide will form ionic bond.
3) Nickel (IV) selenide = ?
→ Nickel (IV) selenide forms ionic bond.
The reaction below is known as the Thermitt reaction, which is used to form molten iron to mould train tracks
together. What mass of aluminium powder is needed to react with 8.00 g of iron (III) oxide?
2 Al + Fe₂O3 —-> Al₂O3 + 2 Fe
2 Al&3irons with 2fe and 36copper
ammonium perchlorate nh4clo4 is the solid rocket fuel that was used by the u.s. space shuttle and is used in the space launch system (sls) of the artemis rocket. it reacts with itself to produce nitrogen gas n2, chlorine gas cl2, oxygen gas o2, water h2o, and a great deal of energy. what mass of oxygen gas is produced by the reaction of 6.54g of ammonium perchlorate? round your answer to 3 significant digits.
The amount of oxygen produced by the reaction of 6.54g of ammonium perchlorate is 2.228g.
The chemical reaction for this will be:
4NH4ClO4 → 5O2 + 6H2O + 2N2 + 4HCl
We know:
'6.54' grams is mass of ammonium perchlorate and '117.49' g/mol is molar mass of ammonium perchlorate
Now, we can calculate moles by:
Moles NH4ClO4 = mass NH4ClO4 / molar mass NH4ClO4
Moles NH4ClO4 = 6.54 grams / 117.49 g/mol
this give 0.0557 moles of NH4ClO4
After this we will calculate the moles of O2 produced similarly:
For 4 moles of ammonium perchlorate consumed, 5 moles of O2 is produced, in addition to 6 moles of H2O, 2 moles of N2 and 4 moles of HCl.
For 0.0696 moles NH4ClO4; we get 5/4 * 0.0557 = 0.0696 moles of O2
And Finally we can calculate the mass of oxygen produced:
Mass of oxygen = moles of O2 * molar mass of O2
Mass of oxygen = 0.0696 moles * 32 g/mol
Mass of oxygen = 2.228 grams
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The type of radioactive decay that releases only energy in order to become stable is
A. gamma decay
B.beta decay
C.electronic decay.
D. alpha decay.
Answer: B Is the answer
Explanation: I just did this
what volume of a 0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution?
Volume of a 0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution is 0.0159 ml
Volume is the measure of the capacity that an object hold
Here given data is
0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution
And the balanced equation is
HNO₃ + KOH → KNO₃ + H₂O
And from the given equation
Mole ratio of acid HNO₃ i.e (nA) = 1
Mole ratio of base KOH i.e (nB) =1
And the molarity of HNO₃ i.e (Ma) = 0.361 m
Volume of base of KOH i.e (Vb) = ?
Molarity of base KOH i.e (Mb) = 0.158 M
Volume of acid HNO₃ i.e (Va) = 27.5 ml
Then MaVa/MbVb
27.5 ml × 0.361 m /0.158 M × Vb = 1/1
9.9275 = 0.158 M × Vb
Vb = 0.158 M/9.9275
Vb = 0.0159 ml
Therefore,0.0159 ml of potassium hydroxide solution is required for the reaction
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What state of matter is H2O above 100°C?
Answer:
Gas
Explanation:
Similarly,if we heat a volume of water above 100 degrees Celsius, or 212 degrees Fahrenheit, water changes it's phase into a gas called water vapor
what is the chemical formula of the ionic compound formed along with water in the reaction of chlorous acid and barium hydroxide?
Barium chloride and water are created when barium hydroxide and hydrochloric acid combine.
what is ionic compound?
An ionic compound in chemistry is a chemical complex made up of ions kept together by electrostatic forces known as ionic bonding. Although the chemical is generally neutral, it does include positively charged ions known as cations and negatively charged ions known as anions. Simple ions like sodium (Na+) and chloride (Cl) in sodium chloride or polyatomic species like the ammonium (NH+ 4) and carbonate (CO2 3) ions in ammonium carbonate can be present in these compounds. Since each individual ion in an ionic compound typically has many nearest neighbours, they aren't thought of as being a part of molecules at all but rather as a continuous three-dimensional network. When solid, ionic chemicals often take the shape of crystals.
The balanced equation for this reaction is: 2HCl (aq) + Ba (OH)2 (aq) → BaCl2 (aq) +2H2 0 (1) If 4 moles of barium hydroxide react The reaction consumes moles of hydrochloric acid.
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how many ml of 6.00 m hcl solution is needed to make 25.0 ml of 3.00 m hcl solution? answer in ml with correct significant figures and do not include units.
The answer is 12.5 mL.
Solution:
M, 6.00M V₁ =?
M2 = 3.00M, V₂ = 25.0mL
M1V1 = M2 V2/M1
V1 = M2V2 M,
V1 = 25.0X3.00/6.00
∴ V1 = 12.5 mL
The initial concentration of the resulting solution is 2 molar which is the volume multiplied by the concentration. The volume of the starting solution is therefore 2,500 ml × 2.25 mol. Calculate the number of moles of HCl dissolved in a given volume of acid by reacting an acid with CaCO3.
This is essentially a double exchange reaction with the decomposition of one of the products. To determine the amount of stock solution required divide the number of moles of glucose by the molarity of the stock solution.
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Consider an atom of Sulfur. Predict one atom in the same group which is larger than a sulfur atom, and one which is smaller. Using these trends and your understanding of Coulomb's Law, analyze how forces of attraction and repulsion affect the size of an atom.
From the periodic trends, one atom in the same group which is larger than a sulfur atom is selenium, and one which is smaller is oxygen.
From Coulomb's Law, the size of an atom decreases with an increase in the force of attraction and decreases with an increase in the forces of repulsion.
What group does sulfur belong to in the periodic table of elements?Sulfur belongs to group 6A or 16 of the periodic table.
Elements in group 6A have six electrons in their valence shells.
The valency of elements in group 6a of the period table is usually 2, 4 or 6.
Based on the periodic trends, the atomic size of elements in group 6A increases on going down the group due to an extra electron shell added to the atoms of the elements.
The other elements in group 6A are oxygen, selenium, and tellurium. etc.
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how would the experimental molecular weight be affected if a few drops of the titrant were stuck on the inside wall of the flask during the titration and not rinsed into the solution?
Drops of the titrant will adhere to the burette's walls, thus additional solution must be diluted into the analyte to make up for this. This will result in a higher volume reading (denominator), which will lower the molarity calculation.
What do you mean by titration?The titrant is a solution with a known concentration that is added to another solution in analytical chemistry to measure the concentration of a different chemical species. The standard solution, reagent, or titrant are other names for the titrant.
In contrast, the species of interest during a titration is the analyte, or titrand. The analyte concentration can be ascertained when it reacts with a titrant that has a known volume and concentration.
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Ionic bonds have all of the following properties, except ___.
soluable (ability to dissolve) in water
strong crystalline solids
generally white in color
when dissolved are electrically conductive
the heat of vaporization of gold is over 4 times greater than that of the heat of fusion of gold. this means that it is easier to
according to the above assertion, melting gold is simpler than boiling it.
What are condensation and vaporization?Evaporation is the transformation of a liquid into its vapor when it occurs below the liquid's boiling point. The transition from a liquid into a gas is known as condensation. The rate of evaporating increases as the temperature rises.
Is vaporizing water boiling a vaporization?The process through which a solution boils and transforms into a gas is known as vaporization. Although evaporation doesn't involve boiling, vaporization is frequently confused with evaporation. The boiling point of a liquid is the heat at which it begins to turn into a gas. Pure water reaches its boiling point at 100°C.
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a mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, calculate the mole fraction of hydrogen in the mixture
A mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, the mole fraction of hydrogen in the mixture is 0.976 mol of hydrogen.
given that :
total pressure = 738 mmHg
partial pressure of water vapor = 17.5 mmHg
Total pressure = partial pressure of hydrogen +partial pressure water vapor
partial pressure hydrogen gas = total pressure-partial pressure water vapor
= 738 - 17.5
= 720.5 mmHg
now the , the partial pressure is given as :
partial pressure of hydrogen gas = mole fraction × total pressure
mole fraction of hydrogen gas = partial pressure / total pressure
= 720.5 / 738
= 0.976 mol of hydrogen
Thus, A mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, the mole fraction of hydrogen in the mixture is 0.976 mol of hydrogen.
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the chemical formula for beryllium oxide is . a chemist measured the amount of beryllium oxide produced during an experiment. she finds that of beryllium oxide is produced. calculate the number of moles of beryllium oxide produced. be sure your answer has the correct number of significant digits.
The number of moles of beryllium oxide BeO are 2.228 moles.
The chemical formula for beryllium oxide is given to be BeO.
The mass of the amount of beryllium oxide formed is 555.7 grams.
we are asked to find the number of moles,
The moles are given by the mass of the substance divided by the molar mass of the substance.
Mass = Mass formed/molar mass
Mass of BeO formed = 55.7 grams.
Molar mass of BeO = 25g/mol.
Putting values,
Moles of BeO = 55.7/25
Moles of BeO = 2.228 moles.
So, the number of moles of beryllium oxide formed are 2.228 moles.
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Complete question - the chemical formula for beryllium oxide is BeO. A chemist measured the amount of beryllium oxide produced during an experiment. she finds that 55.7 grams of beryllium oxide is produced. calculate the number of moles of beryllium oxide produced. be sure your answer has the correct number of significant digits.
a compound that contains only carbon, hydrogen, and oxygen is 68.5% c and 8.63% h by mass. what is the empirical formula of this substance?
According to the given statement C₄H₆O is the empirical formula of this substance.
Why are empirical formulas important?Empirical formulae are beneficial since figuring out the molecular formula can be immensely aided by knowing the relative amounts of each constituent in a molecule. It's crucial to have an n-value in order to figure out the precise figure of each atom within the molecule.
What are instances of empirical formulas?The smallest full numerical percentage of atoms present in a molecule serves as the actual formulation of a substance in chemistry. Hydrogen superoxide (SO) and disulfur -2 empirical formulae are two straightforward examples of this notion (S2O2).
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suppose that 0.250 mol of methane, ch4(g) , is reacted with 0.400 mol of fluorine, f2(g) , forming cf4(g) and hf(g) as sole products. assuming that the reaction occurs at constant pressure, how much heat is released?
The heat released after the reaction is -184.79 kJ
The chemical reaction between methane and fluorine is
[tex] CH_{4}[/tex] + 4[tex] F_{2}[/tex] -> [tex] CF_{4}[/tex] + 4HF, where reactants are methane and fluorine. The products are carbon tetrafluoride and hydrogen fluoride.
The limiting reactant is hydrogen fluoride. Number of moles = (0.440 × 4)/4, here 4 is the number of moles of hydrogen fluoride and fluorine
Performing multiplication and division
Number of moles = 0.440 moles of HF
Enthalpy of reaction = -1679.54 kJ
Heat released = (0.440 × -1679.54)/4
Performing multiplication and division to find the heat released
Heat released = -184.749 kJ
Thus, the heat released is -184.79 kJ
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a given molecule has six electrons in bonding orbitals and two anti-bonding orbitals. what is the bond order for the molecule?
Two anti-bonding orbitals and six electrons in bonding orbitals make up the bond order of the given molecule, which is 2. In the orbital theory, the bonding orbital is used to describe interactions.
The formula for determining bond order is given below. 1/2 (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) Bond length and strength are revealed by bond order. A shorter bond length is typically correlated with higher bond order. The fact that there are more bonds between the atoms explains this.
Half of the difference between the number of bonding and antibonding electrons is another definition of bond order in molecular orbital theory.
Bond order is 1/2. (electrons in bonding orbitals - electrons in anti-bonding orbitals.)
Bond order is 1/2. (6-2)
bond order is two.
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4. What is the frequency of light with a wavelength of 1.87 x 10-14 m?
a. Known values:
b. Equation:
c. Work:
d. Answer:
The frequency of light with a wavelength of 1.87 x 10-14 m = 1.657*10^-22 Hz
What is frequency of light ?
The frequency is the number of waves that go through a given place in space in a given amount of time, typically one second. It is measured in hertz, which stands for cycles (waves) per second. Color is the frequency of visible light, which spans from 430 trillion hertz for red to 750 trillion hertz for violet.
We must determine the frequency given the wavelength. Where, is the sign for frequency, c is the symbol for the speed of light, and is the symbol for wavelength, the equation that links frequency and wavelength is:
The wavelength is 1.87 x 10-14 m and the speed of light is 3*10^8 m/s
To compute the frequency, let's enter the values in the equation and run the calculations:
f = c/wavelength
f = 3*10^8/ 1.87*10^-14 = 1.657*10^-22 Hz
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carbon footprint: given that fossil fuel combustion is the largest source of anthropogenic carbon dioxide emission worldwide, which fuel is most responsible for this emission?
Combustion of coal is the largest source of anthropogenic carbon dioxide emission worldwide given by the carbon footprints.
What are carbon footprints?
Carbon footprints are the total amount of emissions of green house gases by a product, place or an event. The main of this is to take actions against the emission of greenhouse gases and reduce them. It is estimated that burning of 1 Kg coal can give about 2.42Kg of carbon dioxide.
Combustion of coal releases more carbon dioxide than burning petroleum products or natural gas in the whole worldwide. Carbon dioxide is the most important greenhouse gas contributing to the global warming. Coal is considered to be having the highest carbon footprints out of all the energy sources.
Therefore, coal combustion gives out the highest carbon footprint giving the highest carbon dioxide worldwide.
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Question 8(Multiple Choice Worth 4 points)
(01.04 LC)
What best describes a material's ability to dissolve?
O Solubility
O Melting point
O Boiling point
O Thermal conductivity
Answer:
Solubility is the best to dissolve