Answer:
.512 ATM
Explanation:
P1V1 = P2V2
2 * 5 = P2 * 19.5
P2 = .512 ATM
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.
2BrF3(g) -----> Br2(g) + 3F2(g)
Using standard heats of formation, the standard enthalpy change for the reaction is mathematically given as
= 542.11 kJ
What is the standard enthalpy change for the following reaction?Generally, the equation for standard enthalpy change is mathematically given as
[tex]\Delta H rxn = \Delta H product - \Delta H reactant[/tex]
therefore,
[tex]\Delta H rxn = (\Delta H Br_2 + \Delta H 3F_2) - (\Delta H 2BrF_3)[/tex]
= (30.91 kJ + 3*0 kJ) - (2*(-255.6) kJ)
= 542.11 kJ
In conclusion, the standard enthalpy change for the following reaction is
= 542.11 kJ
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Using the valence bond method, explain the structure of isocyanic acid in terms of the atomic bond method.
The structure of isocynide is
N=C
What is the importance of VSEPR theory?
Valence bond theory describes the electronic structure of molecule .The theory says that electrons fills the atomic orbitals of an atom within a molecule .
In the structure of isocynide there are triple bonds between Nitrogen and carbon . The bond length is 115.8pm and the bond angle is 180°. There is two pi and one sigma bond .
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The structure of isocynide is H--N=C
What is meant by valence bond?
Valence bond (VB) theory is a chemical bonding theory that describes the chemical bonding between two atoms. Like molecular orbital (MO) theory, it explains sticking using principles of quantum mechanics. According to valence bond theory, sticking is caused by the overlapping of half-filled atomic orbitals.
What is a valence bond structure?
Valence Bond theory represents covalent bond formation as well as the electronic form of molecules. The theory assumes that electrons inhabit atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are drawn to the nucleus of another atom.
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Which of the following properties allows water molecules to stick to othe types of molecules?
A) Viscosity
B) Adhesion
C) Surface Tension
D) Density
Answer:
B.) Adhesion
Explanation:
A.) is incorrect. Viscosity is a measure of internal friction that affects the fluidity of a liquid.
B.) is correct. Adhesion is the ability of water to stick to other substances (which are not water).
C.) is incorrect. Surface tension is the tension created by the bonds of the surface particles.
D.) is incorrect. Density is a ratio that compares mass to volume.
10. What are saturated and unsaturated fatty acids?
Fatty acids are the building blocks of the fat in our bodies and in the food we eat.
Functionality of fatty acids?Saturated fatty acids consists of single bond of carbon atoms and no double bondSaturated fatty acids are solids in room temperature.Only single bond of hydrocarbon chain is found.Melting point is high and have straight chainIt is soluble in vitamins and obtained from palm oil, coconut oil, and animal fats.Unsaturated fatty acids consists of carbon atoms and there will be one or more double bondsSaturated fatty acids consists of single bond of carbon atoms and no double bond is found. are liquids in room temperature.One or more bond of hydrocarbon chain.Melting point is low and have bend chains at double points.It is insoluble in vitamins and obtained from sunflower oil,walnut,fish oil.To learn more about fatty acids, refer :
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Perform the following opeartiona dn express the answer in scientific notation 3.14x10^-2/2.65x10^-7
Answer:
1.18 x 10⁵
Explanation:
3.14 x 10⁻² / 2.65 x 10⁻⁷ = 1.18 x 10⁵
When performing division, the final answer should have the same number of significant figures as the number with the smallest number of sig figs. In this case, both of the given numbers have 3 sig figs, meaning the final answer should have this many as well.
Ideal Gas Law: Tutorial. At a party, you use a gas canister to fill balloons. The canister holds 4.47 moles of air. If the room is at 26.0°C and the gas pressure is 855 kilopascals, what is the volume of the canister? The volume of the canister is ___ liters. Type the correct answer in the box. Express your answer to the correct number of significant figures. Use the gas laws Fact sheet to help you.
Answer:
13.0 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation and simplify to find "V". The final answer should have 3 sig figs to match the sig figs of the given values.
P = 855 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 26.0 °C + 273.15 = 299.15 K
n = 4.47 moles
PV = nRT
(855 kPa)V = (4.47 moles)(8.314 kPa*L/mol*K)(299.15 K)
(855 kPa)V = 11117.48496
V = 13.0 L
Classify H3PO4 as a strong acid or a weak acid.
Answer:
H3PO4 (phosphoric acid) is weak acid
Explanation:
This is because weak acid is an acid that ionizes only slightly in an aqueous solution.
A student who prefers to study by converting lecture or written information into pictures, graphs, or charts, and then back into words
again: repeating the process as needed and watching videos most likely prefers which learning style?
O a. Visual
O b. Auditory
O c. Reading Writing
O d. Kinesthetic
The answer is C which is Reading Writing
A student who prefers to study by converting lecture or written information. The learning style of the student is reading writing. Thus option c is correct.
What is learning style?Learning style is defined as the hypothesis that learners can be classified based on how they process information.
It can also be defined as a set of theories aimed at explaining variances in individual learning.
There are basically seven types of learning style.
Visual learning style Kinesthetic learning styleAural learning styleSocial learning styleSolitary learning styleVerbal learning styleLogical learning styleReading and writing is one of the best style of learning as by this we can memorize the things for very long time.
Thus, the learning style of the student is reading writing. Thus option c is correct.
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In order to dilute 40.0 mL of 0.600 M HCl to 0.200 M, the volume of water that would need to be added would be 200 mL. 80.0 mL. O 160 mL. 120 mL. 100 mL.
Answer:
80 ml
Explanation:
Moles to start = .04 L * .6 M/L = .024 moles
this is how much must be in the final dilution
.2 moles / liter * x liter = .024 moles
x = .024 / .2 = .12 liter final volume
start with . 040 then add .080 to get .12 liter
.080 liter = 80 ml
please solve this fast
will BeCO3 Hydrolyze in aqueous medium?. If so how?... very urgent..
Answer:
BeCO3 will hydrolyze in an aqueous medium, yielding a basic solution.
Explanation:
In accord with the rules of salt hydrolysis, the cation [tex]Be^{2+}[/tex] can hydrolyze. The anion [tex]CO_{3} ^{2-}[/tex] can also hydrolyze, given that the resulting conjugate acid is weak.
Given that both ions hydrolyze, the Ka (acid ionization constant) and Kb (Base ionization constant) of each reactant (or product [that is, the conjugate acid and base for each ion]) must be compared.
Using the web (hopefully some sort of reference table has been provided to you):
Ka (for Be^2+) = [tex]3 * 10^{-7}[/tex]
Kb (for CO3^2-) = [tex]\frac{Kw (water)}{Ka (HCO3)}[/tex]
= [tex]\frac{1*10^{-14}}{4.7*10^{-11}}[/tex]
= [tex]2.1 * 10^{-4}[/tex]
The Kb > Ka, so the solution will be basic.
Hope this helps! My apologies if this answer is incorrect, I have not done this type of problem in a while.
A 24.5 mL sample of a 0.376 M aqueous hypochlorous acid solution is titrated with a 0.487 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?
The pH of the solution when no base is added is 0.424.
An aqueous solution's acidity or basicity can be determined using the pH scale. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
The chemical formula of hypochlorous acid is HClO.
1 mole of HClO produces 1 mole of hydrogen ions and 1 mole of fluoride ions.
KOH (aq) + HClO (aq) → KClO (l) + H2O (l)
To calculate the pH of the solution when no base is added, we use the equation:
[tex]p_{H} = - log {H}^{+}[/tex]
We are given:
[tex]H^{+} = 0.376 M[/tex]
Putting values in the above equation, we get:
[tex]p_{H} = - log (0.376)[/tex]
[tex]p_{H}[/tex] = 0.424
Hence, the pH of the solution when no base is added is 0.424
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Hydrochloric Acid would best be described as a:
Group of answer choices
A. Arrhenius, BrØnsted-Lowrey and Lewis Base
B. Arrhenius, BrØnsted-Lowrey and Lewis Acid
C. BrØnsted-Lowrey and Lewis Acid
D. Arrhenius and Lewis Acid
Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid (option B).
What is Arrhenius, Brønsted-Lowry acid?Arrhenius acid is any substance that dissociates in an aqueous solution to form hydrogen ions (H+) or proton.
On the other hand, a Brønsted-Lowry acid is any substance that can donate a proton or hydrogen ion to another substance.
Hydrochloric acid (HCl) can be categorized as an Arrhenius acid and Brønsted-Lowry acid because it has the ability to donate H+ and increase the hydrogen ion concentration of an aqueous solution.
Also, Lewis cids are the chemical substances that are able to accept electron pairs.
Therefore, Hydrochloric acid would best be described as a Arrhenius acid, Lewis acid and Brønsted-Lowry acid.
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help! awarding 20 points
a. The circulatory system in fish is one-directional while it is two-directional in humans.
b. P has a high concentration of carbon dioxide and low oxygen concentration whereas Q has high oxygen concentration and low carbon dioxide concentration.
What is the circulatory system?The circulatory system is the system of organism and tissues which help to transport blood and other fluids through the body of a living organism.
The organs of the circulatory system include:
The heartThe blood vessels - veins, arteries, capillariesa. In the given diagram sowing the circulatory system of man and the fish, it can be seen that the direction of blood flow in the fish is one way through the heart. However, in humans, the direction of blood flow is two-way through the heart.
b. The gas in P has a high concentration of carbon dioxide and low oxygen concentration. However, the gas flowing through Q has high oxygen concentration and low carbon dioxide concentration.
In conclusion, the circulatory system is important in the exchange of gases in the body.
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25.0 mL of an LiOH solution were titrated with 29.15 mLof a 0.205 M H3PO4 solution to reach the equivalence point. What is the molarity of the LiOH solution?
Answer:
0.717 M LiOH
Explanation:
(Step 1)
Calculate the moles of H₃PO₄ using the molarity equation.
29.15 mL / 1,000 = 0.02915 L
Molarity = moles / volume (L)
0.205 M = moles / 0.02915 L
0.00598 = moles
(Step 2)
Convert moles H₃PO₄ to moles LiOH using the mole-to-mole ratio from reaction coefficients.
1 H₃PO₄ + 3 LiOH -----> Li₃PO₄ + 3 H₂O
^ ^
0.00598 moles H₃PO₄ 3 moles LiOH
------------------------------------ x -------------------------- = 0.0179 moles LiOH
1 mole H₃PO₄
(Step 3)
Calculate the molarity of LiOH using the molarity equation.
25.0 mL / 1,000 = 0.0250 L
Molarity = moles / volume (L)
Molarity = 0.0179 moles / 0.0250 L
Molarity = 0.717 M
For the reaction: 3 H2(g) + N2(g) <--> 2 NH3(g), the concentrations at equilbrium were [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3.1 x 105
B. K = 560
C. K = 5.6 x 10-4
D. K = 1.8 x 10-3
The equilibrium constant, k of the reaction in which case, the concentrations of the given reactants and products are as indicated is; Choice A; K = 3.1 x 10⁵
What is the equilibrium constant , k of the reaction as described in the task content?It follows from above that the concentrations of the reactants and products are as follows; [H2] = 0.10 M, [N2] = 0.10 M, and [NH3] = 5.6 M at equilibrium.
Hence, the equilibrium constant of the reaction in discuss is;
K = [5.6]²/[0.10]³[0.10]
k = 5.6² × 10⁴
k = 3.136 × 10⁵
K = 3.1 × 10⁵.
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How much heat is released if a 10.0 gram piece of aluminum is cooled from 70°C to 50°C?
Group of answer choices
A. +180 J
B. -200 J
C. -180 J
D. +200 J
C. The heat released when the aluminum is cooled from 70°C to 50°C is -180 J.
What is Specific heat capacity?
Specific heat capacity is the quantity of heat needed to raise the temperature per unit mass.
Heat released when the aluminum is cooledThe heat released when the aluminum is cooled from 70°C to 50°C is calculated as follows;
Q = mcΔθ
where;
m is mass of the aluminum c is specific heat capacityΔθ is change in temperatureQ = (10)(0.9)(50 - 70)
Q = -180 J
Thus, the heat released when the aluminum is cooled from 70°C to 50°C is -180 J.
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State whether the following liquids are miscible with water (H2O) by entering "yes" or "no".
1) Benzene, C6H6
2) Methanol, CH3OH
3) Chloroform, CHCl3
How many grams of oxygen gas are needed to react completely with 28.442 grams of sulfur dioxide gas ?
Answer:
SO2(g) + O2(g) SO3(g) (needs to be balanced. Balance it by placing a 1/2 in front of the 02.) This is a 5-sig-fig problem, so when you calculate your molar masses, you must use all of the sig figs available to you from the periodic table. That's how you can get this problem correct. Melissa Maribel likes to round the numbers from the periodic table, and usually that is ok. But for problems where you have many sig figs, your molar masses from the periodic table must have at least as many sig figs as your data. Therefore, for each oxygen atom, please use 15.9994 g/mol. For each sulfur atom, please use 32.066 g/mol. Thank you.
Answer:
7.1029 gms of O2
Explanation:
First balance the equation to get
2 SO2 + O2 ====> 2 SO3
Mole weight of sulfur dioxide gas
S + 2 O == 32.066 + 2 * 15.999 = 64.064 gm/mole ( 5 signif digits)
28.442 gm / 64.064 gm/mole = .44396 mole of SO2 ( 5 sig digits)
From the balanced equation, you can see you need 1/2 as many moles of O2 as SO2:
mole weight of O2 = 2 * 15.999 = 31.998 gm / mole ( 5 sig digits)
now you need 1/2 of .44396 moles of this
1/2 * .44396 * 31.998 = 7.1029 gm ( 5 sig digits)
Is HF the most polar among covalent bonds?
Answer:
No.
Explanation:
HI is more polar than HF
What mass (g) of solute is contained in 417 mL of a 0.327 M magnesium fluoride (MgF2) solution?
Answer: [tex]\Large\boxed{m=8.5~g}[/tex]
Rounded to the nearest 2 significant figures
Explanation:
Given information
Volume of Solution = 417 mL
Molarity of Solution = 0.327 M (mol / L)
Given molecular weight
Mg (Magnesium) = 24 g / mol
F (Flourine) = 19 g / mol
Total Weight (MgF₂) = 24 + 2 × 19 = 62 g /mol
Given formula
m = V × M × n
m = massV = VolumeM = Molarityn = molar mass (molecular weight)Convert the unit of volume to Liter
1 L = 1000 mL
417 mL = 417 / 1000 = 0.417 L
Substitute values into the given formula
m = (0.417) × (0.327) × (62)
Simplify by multiplication
m = 136.359 × 62
[tex]\Large\boxed{m=8.5~g}[/tex]
Hope this helps!! :)
Please let me know if you have any questions
Once balanced, what is the coefficient of HCl in the following reaction:
Mg + HCl → MgCl2 + H2
Group of answer choices
A. 1
B. 2
C. 0
D. 3
Once balanced, the coefficient of HCl in the following reaction: Mg + HCl → MgCl2 + H2 is 2 (option B).
How is a chemical reaction balanced?A chemical reaction is said to be balanced when the number of moles of each atom of an element on both sides of the equation is the same.
According to this question, magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen gas as follows:
Mg + HCl → MgCl2 + H2
However, to balance the equation, we make use of coefficients, which are numbers placed in front of a compound to make the number of moles of atoms equal.
The balanced equation is as follows:
Mg + 2HCl → MgCl2 + H2
Therefore, once balanced, the coefficient of HCl in the following reaction: Mg + HCl → MgCl2 + H2 is 2.
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When aqueous magnesium chloride reacts with liquid bromine
Predict the products and write a word equation and a balanced chemical reaction
equation for when aqueous lithium sulfate reacts with aqueous calcium iodide.
Answer:
1.) aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate
2.) Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)
Explanation:
This appears to be a double-displacement reaction. In these reactions, the cation of one compound swaps with the cation of another.
Therefore, lithium swaps with calcium. The new products are lithium iodide (LiI) and calcium sulfate (CaSO₄). Lithium iodide is soluble in water, whereas calcium sulfate is generally not.
The word equation (including the states of matter):
aqueous lithium sulfate + aqueous calcium iodide ---> aqueous lithium iodide + solid calcium sulfate
An equation is balanced when there is an equal amount of each element on both sides of a reaction. If these amounts are unequal, you can add coefficients to modify the quantities of particular molecules.
The unbalanced equation:
Li₂SO₄ (aq) + CaI₂ (aq) ------> LiI (aq) + CaSO₄ (s)
Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine
Products: 1 lithium, 1 sulfur, 4 oxygen, 1 calcium, 1 iodine
The balanced equation:
Li₂SO₄ (aq) + CaI₂ (aq) ------> 2 LiI (aq) + CaSO₄ (s)
Reactants: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine
Products: 2 lithium, 1 sulfur, 4 oxygen, 1 calcium, 2 iodine
What if there was an inverse relationship between the temperature and the volume? How do you think the world might be different? How would this change our day-to-day lives?
If there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.
What if there was an inverse relationship between the temperature and the volume?If there was an inverse relationship between the temperature and the volume then with increasing temperature decrease occur in the volume of a substance. If this type of relationship is present in the world, the objects will contract when the temperature is high and expand when the temperature is low which make the solid materials expand at winter and contract at summer season.
So we can conclude that if there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.
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What is the name of an isotope having 29 protons and 23 neutrons? Write the elemental symbol and mass number of this isotope.
Answer:
copper - 52 (or Cu - 52)
⁵²Cu
Explanation:
Isotopes are different atoms of the same element that differ in the number of neutrons. Therefore, you can determine which element this is by examining the number of protons. All atoms with 29 protons are copper (Cu).
The mass number is the total number of protons and neutrons in an atom. Therefore, the mass number of this isotope is 52 (29 + 23 = 53). When writing an elemental symbol, the mass number is found on the top left.
As such, the name of this isotope is copper - 52 (or Cu - 52) and the symbol is ⁵²Cu.
100.0 mL of a 0.695 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?
Answer:
0.116 M
Explanation:
(Step 1)
Calculate the amount of moles using the molarity ratio.
100.0 mL / 1,000 = 0.1000 L
Molarity = moles / volume
0.695 M = moles / 0.1000 L
0.0695 = moles
(Step 2)
Calculate the new molarity using the moles and new volume.
500.0 mL / 1,000 = 0.5000 L
Molarity = moles / volume
Molarity = 0.0695 moles / (0.1000 L + 0.5000 L)
Molarity = 0.0695 moles / (0.6000 L)
Molarity = 0.116 M
10 Points
The International Commission of Radiological Protection has set the limit for yearly radiation exposure at 1000 uSv. What is the risk
associated with this dose?
A. No risk at this limit or below.
OB. 1/2400 chance of cancer over a 40 year period.
OC. 1/1000 chance of cancer over a 40 year period.
OD. 1/100,000 chance of cancer over a 40 year period.
The maximum allowable annual dose of radiation has been set at 1000 uSv by the worldwide commission on radiological protection. At this threshold or lower, there is no risk.
What is S(sievert)?
The sievert, a measurement used to measure radiation, is used to calculate how much radiation is taken in by human tissues.1000 millisieverts are equal to one sievert (mSv) [ 1 Sv= 1000 mSv]. There are 1,000 microsieverts in a millisievert[ 1 mSv = 1000 uSv]Here are some details concerning the risks increasing radiation levels cause to our health:
Yukio Edano, Japan's Chief Cabinet Secretary, had said that radiation levels near the damaged facility on the northeast coast may rise to 400 millisieverts (mSv) per hour.The lowest dose of exposure that causes any rise in cancer probability is readily visible is 100 mSv per year. Five out of every 100 people exposed to a cumulative 1,000 mSv (1 sievert) may likely get a deadly malignancy several years later.The central nervous system, as well as the red and white blood cells, are destroyed by high radiation doses or acute radiation exposure. This impairs the immune system, making it difficult for the sufferer to fight off diseases.One sievert (1,000 mSv), for instance, only results in radiation sickness, which includes nausea, vomiting, and bleeding, but not death. About half of individuals exposed to a single dose of 5 sieverts would perish within a month.Therefore the correct choice is an option (A).
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Answer:
Answer D
Explanation:from founders Edtell :
A dose of 1000 uSv is believed to carry a 1/100,000 risk of getting cancer over 40 years due to your exposure to radiation. The average dose is around 2400 uSv.
An oven-cleaning solution is 40.0% (by mass) NaOH.
If one jar of this product contains 458 g of solution, how much NaOH (by mass) does it contain?
The amount of NaOH by mass the jar contains will be 183.2 g
Percent compositionThe percent by mass of NaOH in the oven-cleaning solution is 40.0%.
This means that for every 100 g of the cleaning solution, there would be 40 g of NaOH.
Now, the jar in question contains 458 g of this solution which is 40.0% NaOH by mass.
The amount of NaOH in the jar can be calculated as:
40/100 x 458 = 183.2 g
This means that 458 g of the oven-cleaning solution that is present in the jar contains 183.2 g of NaOH.
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Given the reaction
2 HI(g) <--> H2(g) + I2(g)
At 430 degrees Celsius, the equilibrium concentrations are [HI] = .5M, [H2] = 0.5 M, and [I2] = 1.5 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3
B. K = 1.5
C. K = 0.33
D. K = 0.67
From the calculation, the equilibrium constant is obtained as 3. Option A
What is the equilibrium constant?The term equilibrium constant shows the extent to which we could see the conversion of the reactants to products in a reaction system. Now we know that the equilibrium constant can be obtained by the use of the formula;
K = [H2] [I2]/[HI]^2
Now we have that at equilibrium;
[H2] = 0.5 M
[I2] = 1.5 M
[HI] = 0.5M
It then follows that;
K = 1.5 * 0.5/( 0.5)^2
K = 3
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