Which of these solutions are basic at 25 °C? Solution A: [OH−]=3.13×10−7 M Solution C: [H3O+]=0.000747 M Solution B: [H3O+]=9.55×10−9 M
Answer:
Are basic:
[OH⁻] = 3.13x10⁻⁷M and [H₃O⁺] = 9.55x10⁻⁹M
Explanation:
A solution is basic when pH = - log [H₃O⁺] is higher than 7.
It is possible to convert [OH⁻] to [H₃O⁺] using:
[H₃O⁺] = 1x10⁻¹⁴ / [OH⁻]
a. [OH⁻] = 3.13x10⁻⁷M
[H₃O⁺] = 1x10⁻¹⁴ / [3.13x10⁻⁷M]
[H₃O⁺] = 3.19x10⁻⁸M
pH = - log [H₃O⁺] = 7.50
[OH⁻] = 3.13x10⁻⁷M is basic
b. pH = -log [H₃O⁺] = - log 0.000747M = 3.13.
This solution is not basic
c. [H₃O⁺] = 9.55x10⁻⁹M
pH = 8.02
This solution is also basic.
A mixture of 80.0 g of oxygen and 80.0 g of helium has a total
pressure of 0.1800 atm. What is the partial pressure of each gas?
Answer:
Partial pressure of O₂ = 0.0198 atm
Partial pressure of He = 0.1584 atm
Explanation:
Given data:
Mass of oxygen = 80.0 g
Mass of helium = 80.0 g
Total pressure = 0.1800 atm
Partial pressure of each gas = ?
Solution:
First of all we will calculate the number of moles.
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 32 g/mol
Number of moles = 2.5 mol
Number of moles of helium:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 4 g/mol
Number of moles = 20 mol
Total number of moles = 20 mol + 2.5 mol = 22.5 mol
Mole fraction of O₂ = 2.5 mol/ 22.5 mol = 0.11
Mole fraction of He = 20 mol / 22.5 mol = 0.88
Partial pressure:
Partial pressure of O₂ = 0.11× 0.1800 atm = 0.0198 atm
Partial pressure of He = 0.88 × 0.1800 atm = 0.1584 atm
Two moles of acetyl chloride was mixed with two moles of dimethylamine. After the reaction is complete, what species can be found in the mixture
Answer:
See explanation
Explanation:
The reaction is shown in the image attached. This reaction occurs by a carbocation (ionic) mechanism.
The lone pair on the nitrogen atom attacks the carbocation leading to the formation of the product as shown in the image attached.
Since the reaction occurs in a 1:1 ratio, two moles of reactants yields two moles of product.
A 0.40 g sample of sodium salicylate was dissolved and diluted to a final volume of 250 mL with deionized water. What is the concentration of this solution
Answer:
9.99x10-3
will this help mate?
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
O A. The sample of solid has more energy than the sample of gas.
B. The sample of liquid has more energy than the sample of solid.
C. The sample of plasma has less energy than the sample of gas.
D. The sample of liquid has less energy than the sample of solid.
The sample of the liquid has more energy than the sample of solid. Hence, option B is correct.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature.
The particles in the liquid are the same as in the solid but they have more energy. To melt solid energy is required to overcome the attraction between the particles and allow them to pull them apart. The energy is provided when the solid is heated up.
Hence, option B is correct.
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bi-S is relatively more stable than bi-n bond. give reasons for the HSAB concept
Answer:
xhhhvxhxgjhgogftsvicsdgfsytdhdrrygyfhd
Explanation:
ywwgzwu9wu9wsussg the the
Type in the name of the following compounds. Be sure to use the periodic table if needed.
the answer is Sulfur dioxide
Answer:
Sulfur Dioxide
Explanation:
hope this helps:)
I need the answer to this multiple-choice
Solid nickel reacts with aqueous lead (II) nitrate to form solid lead. What is the net ionic equation for this reaction? • Hint: In this reaction, nickel exhibits its most common oxidation state of +2. • Be sure to include the charge for each ion in the net ionic equation. Provide your answer below: (s) + (aq) → *(n)
Answer:
Pb²⁺(aq) --> Ni²⁺(aq)
Explanation:
The equation of the reaction is given as;
Ni(s) + Pb(NO₃)₂(aq) --> Pb(s) + Ni(NO₃)₂(aq)
In writing the ionic equation, we break the aqueous compound into ions. The solid and liquid compounds are ignored.
We have;
Pb²⁺(aq) + NO₃²⁻(aq) --> Ni²⁺(aq) + NO₃²⁻(aq)
Canceling the spectator ions;
Pb²⁺(aq) --> Ni²⁺(aq)
Answer:
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
Explanation:
The complete ionic equation of this reaction is
Ni(s)+Pb2+(aq)+2 NO−3(aq)→Ni2+(aq)+2 NO−3(aq)+Pb(s)
The nitrate ions are spectator ions and can be removed from the equation, giving us
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
A mixture of 40 mol % isopropanol in water is distilled at 1 atm by differential distillation until 70 mol % of the charge has been vaporized (equilibrium data are given in Exercise 7.33). What is the composition of the liquid residue in the still pot and of the collected distillate
Answer:
Explanation:
From the given information:
The percentage wieght of mixture [tex]x_w[/tex] = 0.4
The distillate = 70
From equilibrium data in Exercise 7.33
The Feed W = 100
The Liquid residue F = Feed(W) - Distillate (D)
= 100 - 70 = 30
By applying rayleigh equation;
[tex]In \bigg (\dfrac{F}{W}\bigg)= \int^{xF}_{x_w}\dfrac{1}{y-x} \ dx[/tex]
From the plot of the graph of [tex]\dfrac{1}{y-x} \ vs \ x[/tex]; the area under the curve is being calculated between the point {[tex]x_1 = 0.4 \ and \ x_2[/tex] }.
Such that; the area [tex]= In \bigg( \dfrac{100}{30}\bigg)[/tex] = 1.209
Similarly, the value of xF = 0.067
∴
[tex]y_D = \dfrac{F_{xF} - W_{xW}}{D}[/tex]
[tex]y_D = \dfrac{30(0.067)-100(0.4)}{70}[/tex]
[tex]y_D = 0.543[/tex]
A student pushes a heavy lab table that weighs 400N for 15m across a room. How much work was done?
Answer:
The answer is 6000 NExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 400 × 15
We have the final answer as
6000 NHope this helps you
What evidence should Mitchell collect to BEST support the second law of thermodynamics?
Answer:
The Second Law of Thermodynamics poses an insurmountable problem for ... More time will make things worse for the Darwinist, not better. ... error fail-safe and proof-reading devices utilized for quality control, assembly ... No one really supports the idea that the sun + non life = life
Explanation:
According to the second law of thermodynamics, the energy of the universe is conserved but the entropy of the universe is continuously increasing.
What is the second law of thermodynamics?The second law of thermodynamics put some restrictions on the direction of heat transfer and attainable efficiencies of heat engines. This law stated that any spontaneously happening process will lead to an escalation in the entropy (S) of the universe.
This law explains that the entropy of an isolated system will never decrease with time. Mathematically, the 2nd law of thermodynamics:
ΔS (universe) > 0
where ΔS of the universe is the change in the entropy of the universe.
The second law of thermodynamics provides the criterion for the feasibility of any physical or chemical process. A physical or chemical process cannot take place unless it must follow both the 1st and 2nd laws of thermodynamics.
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Predict and write the charges and symbols of the monatomic ions formed by the following atoms: bromine rubidium
Answer: The monoatomic ions formed by bromine and rubidium are [tex]Br^-[/tex] and [tex]Rb^+[/tex] respectively.
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion. When atom loses an electron positive charge is created on atom and is called as cation.
The atomic number of bromine and rubidium is 35 and 37 respectively. So, the number of electrons is equal to 35 and 37 respectively. Bromine will gain one electron and rubidium will lose one electron to attain stable electronic configuration to form [tex]Br^-[/tex] and [tex]Rb^+[/tex] respectively.
[tex]Br:35:1s^22s^22p^63s^23p^64s^23d^{10}4p^5[/tex]
[tex]Br^-:36:1s^22s^22p^63s^23p^64s^23d^{10}4p^6[/tex]
[tex]Rb:37:1s^22s^22p^63s^23p^64s^23d^{10}4p^63s^1[/tex]
[tex]Rb^+:36:1s^22s^22p^63s^23p^64s^23d^{10}4p^6[/tex]
what can chemically be broken down into a simpler substance
Answer: ea sports
Explanation:
A compound is a substance that contains two or more elements chemically combined in a fixed proportion. However, it is not an element because it can be broken down into simpler substances – carbon and hydrogen. ... Recall that the components of a mixture can be separated from one another by physical means.
Unsanitary meat processing, poisonous additives, and false claims about the efficacy of drugs (i.e., "snake oil") resulted in the original Food
and Drugs Act and Meat Inspection Act in 1906.
True or False
Hello I was wondering if anyone knew how to draw the molecular geometry of fentanyl. I already did the Lewis structure.
Answer:
i dont
Explanation:
Which of the following statements about atomic mass is true? (help asap)
A. It represents the number of protons
B. It is the relative amount of mass of the element
C. It is the whole number used to numerically order the elements
D. It equals the number of electrons when the element is a neutral atom
Answer:
B
Explanation:
Because the atomic mass is the mass of a single atom of a chemical elements
What is the final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L
Answer: The final concentration of a solution is 0.350 M
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of concentrated acid solution = 12.0 M
[tex]V_1[/tex] = volume of concentrated acid solution = 35.0 ml
[tex]C_2[/tex] = concentration of diluted acid solution= ?
[tex]V_2[/tex] = volume of another acid solution= 1.20 L = 1200 ml
( 1L=1000ml)
Putting in the values:
[tex]12.0\times 35.0=C_2\times 1200[/tex]
[tex]C_2=0.350M[/tex]
The final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L is 0.350 M
The greatest absorbance occurs when the solution and beam color are the ______ because the solution color appearance is the color being ___________ by the solution.
Answer:
Same
Absorbed
Explanation:
When you are dealing with solutions the best way to tell that something has been absorbed is when the solution and the beam color are the same, since they have the same color you can be sure that the color has been absorbed properly and the greatest absorbance has occured.
The fill in the blanks should be filled with the same and absorbed.
The following information should be considered:
At the time when you deal with the solutions, the best way is that something should be absorbed at the time when the solution & beam color should be similar. As it contains the similar color so the color should been absorbed properly & the highest absorbance should be arise.Therefore we can conclude that the fill in the blanks should be filled with the same and absorbed.
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Plzzzz answer quick
An excited electron of hydrogen emits the least energy when it drops from 1 point
quantum levels *
Level 4 to level 2
level 5 to level 1
level 2 to level 1
O level 2 to level 5
Answer:
sorry to do this but I really needed some points to ask my question from someone else so that's why I am doing so really sorry and thank you for free points
The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.
If an electron of hydrogen gets excited and drops from energy level 2 to level 1 to release least energy. The level shows the energy levels.
Therefore, the correct option is option C.
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Fireworks explode above your
head. Is this exothermic or
endothermic and why?
please helppp
which one??????????
A 7-kg bowling ball is rolled down a lane while a 10-kg cart remains at rest. Which has the greatest inertia?
Im sorry but I have the same question tell me when you figure it out please
which color???????
please help
Answer:violet
Explanation:Even though violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
The specific heat of ethanol (C2H5OH) is 2.46 J/g ° C. What is the heat capacity of 1.00 kg of ethanol?
Answer:
The total heat required is 4088.6 J
Explanation:
We have three processes which involve heat absorption. We have to calculate the heat of each process and then to calculate the total heat.
1- liquid ethanol is heated from 25ºC (298 K) to the boiling point 78.5ºc (351.5 K). We use specifi heat of liquid ethanol to calculate the heat absorbed in this part:
H1= m x Sh x ΔT
H1= m x Sh x (Tfinal - Tinitial)
H1= 3.95 g x 2.45 J/g.K x (351.5 K -298 K)
H1= 517.7 JExplanation:
PLEAS HELP ASAP WILL MARK BRAINLIST
Answer:
Carbon
Explanation:
substance in which two or more atoms are bonded together.
molecule(s)
two or more atoms touching means they are connected as molecules which also make up compounds
Gustavo and Beatriz are pushing on a door in opposite
directions. If the door does not move, the forces are
The net force in this scenario would be Answer: balanced and zero
Answer:
Correct
Explanation:
Balanced forces are always zero!
Answer:
Balanced
Zero
Explanation:
What is the relationship between pressure and temperature
Answer:
The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. With an increase in temperature, the pressure will go up.
Explanation:
How many grams of Fe can be produced when 6.50 g of Fe2O3 reacts?
Answer:
Mass of Fe produced = 4.468 g
Explanation:
Given data:
Mass of Fe produced = ?
Mass of Fe₂O₃ react = 6.50 g
Solution:
Chemical equation:
2Fe₂O₃ → 4Fe + 3O₂
Number of moles of Fe₂O₃ ;
Number of moles = mass/molar mass
Number of moles = 6.50 g/159.69 g/mol
Number of moles = 0.04 mol
Now we will compare the moles of iron and ironoxide.
Fe₂O₃ : Fe
2 : 4
0.04 : 4/2×0.04 = 0.08 mol
Mass of iron produced:
Mass = number of moles × molar mass
Mass = 0.08 mol × 55.85 g/mol
Mass = 4.468 g