This problem is providing us with the solubility product of two hydroxides, which can be used to calculate the pH at which they will precipitate. At the end, the answer turns out to be 9.67.
Solubility product:In chemistry, we use solubility products in order to quantify the amount of precipitate a solid will be leftover after dissolving it. Thus, we can just write the equilibrium expressions and solve for x, molar solubility, for each hydroxide as follows:
[tex]Ksp=[M^+][OH ^-]\\\\2.15x10^{-12}=(0.001+x)(x)\\\\x=2.15x10 ^{-9}M\\\\Ksp=[M^2^+][OH ^-]^2\\\\2.15x10^{-12}=(0.001+x)(x)^2\\\\x=4.535x10 ^{-5}M\\\\[/tex]
Then, since both x's contribute to the concentration of hydroxide ions, but just the second one is predominant, we add them together to get the total:
[tex][OH^-]=4.535x10^{-5}M+2.15x10^{-9}M=4.535x10^{-5}M[/tex]
Finally, we calculate the pOH and pH with:
[tex]pOH=-log(4.535x10^{-5})=4.343\\\\pH=14-pOH=9.67[/tex]
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I don’t know what the correct answer is? Can anyone explain?
Short Answer:
C)
Long Answer:
A- When a solid is heated, it melts and becomes a liquid. (Another older term is Fusion.) An example of this is ice to water when you leave it outside the freezer.
B- When a liquid becomes a gas, it undergoes a process called boiling. Example: When you boil water, it becomes steam.
C- It is called deposition. Example: How snow forms in clouds.
The fluid-filled area between the pleural layers is the.
The fluid filled area between the pleural layers is called the pleural cavity.
Diamonds and graphite are two forms of what nonmetal?.
Answer:
Carbon AtomsExplanation: Diamond and graphite are made out of carbon atoms. The difference between the two substance is the arrangement of the carbon atoms inside each one.
Answer:
Diamond and graphite are allotropes of carbon
Explanation:
» Diamond has tetrahedral edges associating through weaker vander waal forces of attraction, it is colorless and glittering, and it is very hard.
» Graphite has hexagonal edges associating vander waal forces, it is black in color and it is soft. Example of graphite is the black rod in a dry cell.
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What is the meaning of feedback mechanism in relation to homeostasis?
Answer:
A feedback mechanism is a physiological regulation system in a living body that works to return the body to its normal internal state, commonly known as homeostasis. ... The term “feedback mechanism” was first used in cybernetics to characterize a control system's ability to change its output in response to an input.
Explanation:
Can someone please help!! Name the parts making the male part of the flower. And state what each part does please don’t search up the answers and put it into your own words it would mean alot
Answer:
Anther: It produces pollen.
Filament: It hold the anther.
Anther and filament together make the stamen.
What is the name for the CENTER of a spiral galaxy? What KIND of stars live in the center of a
spiral galaxy?
It is important to allow each spot added to the chromatography paper to dry completely before adding another spot. Why is this so important?.
It is important to allow each spot added to the chromatography paper to dry completely before adding another spot in order to allow even separation of the solutes.
What is chromatography:Chromatography is the biological technique used to separate the constituent solutes of a solution using a stationary medium and a moving phase.
There are different types of chromatographic procedure including;
Paper chromatographyColumn chromatographyThin layer chromatographyIn paper chromatography, paper is used as the stationary medium. It is however, important to allow each spot added to the chromatography paper to dry completely before adding another spot in order to allow even separation of the solutes.
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What is the biggest human advancement that has happened on earth?
Answer: Glass
Explanation: It helps us drive if we didnt have it then we would have to blink a lot more while driving which would result in a lot more people getting in to car crashes imagine plaines without windows or glass.
in a sealed and rigid container, a sample of gas at 2.00 atm and 25.0 °c is heated to 50.0 °c. what is the pressure (in atm) of the gas at 50.0 °c?
We have that the the pressure (in atm) of the gas at 50.0 °c is mathematically given as
P2= 2.17 atm
Gay-Lussac's lawThe Gay-Lussac's law states that pressure exerted by gas is directly proportional to the absolute temperature of the gas.
Generally the equation for the Gay-Lussac's law is mathematically given a
P1 / T1 = P2 / T2
Therefore
T1 = 25C
T1= 25 + 273
T1= 298 K
And
T2 = 50C
T2= 50 + 273
T2= 323 K
Therefore
[tex]P2 = \frac{2.00 x 323}{298 }[/tex]
P2= 2.17 atm
Hence, the pressure (in atm) of the gas at 50.0 °c is
[tex]P2 = \frac{2.00 x 323}{298 }[/tex]
P2= 2.17 atm
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This is the equation for the dissociation of ammonia gas at 293 K. Delta. H = 145 kJ and Delta. S = 195 J/k. 2NH3(g) Right arrow. N2(g) 3H2(g) Which correctly states the Delta. G for this dissociation and whether the process is spontaneous or nonspontaneous? Use Delta. G = Delta. H – TDelta. S. –87. 87 kJ, spontaneous –50 kJ, spontaneous 87. 9 kJ, nonspontaneous 202. 14 kJ, nonspontaneous.
The delta G for the dissociation is 87,865 joule/kg.
The process is non-spontaneous because the value of Gibbs free energy is positive.
What is dissociation?The breaking up of a compound into a simpler form that can be recombined under other conditions.
Given,
[tex]\bold{2NH_3 (g) = N_2(g) + 3H_2(g)}[/tex]
H = 145 kJ
Delta S = 195 J/k
Determining the G using the following process:
G = H -TS
[tex]\bold{G = (145\times10^3 J) -(293K \times 195 J/K})[/tex]
G = 87,865 Joules/K
Thus, the value of Delta G is 87,865 and the process is non-spontaneous.
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Answer:
C. 87.9 kJ, nonspontaneous
Explanation:
just did the quiz
Among the following scenarios, which best demonstrates resilience when confronted with stress?
Chance has experienced a sports-related injury. He copes with this by avoiding the advice of his trainer and continuing to try to perform his best on the field.
Antonio is presented with a project that is difficult to carry-out, but decides to view this project as a challenge that will also contribute to his personal growth.
Frank learns that he will be laid off from his job after working there for 15 years. He deals with his stress by confronting the company’s CEO with his feelings of anger and loss.
Monique is experiencing the loss of a relationship. To cope with this, she chooses to explain to people all of the ways that her former partner contributed to the demise of their relationship.
option A. best demonstrates resilience when confronted with stress.
What is stress?stress describes a person's physical or emotional reaction to the demands or pressures of daily existence. common causes of strain consist of paintings, money, relationships, and contamination.Acute stress.Episodic acute pressure.persistent stress.pressure is a feeling of emotional or physical tension. it is able to come from any event or concept that makes you sense frustrated, angry, or anxious. pressure is your frame's reaction to a task or demandLearn more about Stress here:-https://brainly.com/question/154477
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How much energy is required to evaporate grams of water?.
Answer:
energy known as the latent heat of vaporization is required to break the hydrogen bonds. At 100 °C, 540 calories per gram of water are needed to convert one gram of liquid water to one gram of water vapour under normal pressure.
Explanation:energy known as the latent heat of vaporization is required to break the hydrogen bonds. At 100 °C, 540 calories per gram of water are needed to convert one gram of liquid water to one gram of water vapour under normal pressure.
Answer:
100 °C, 540 calories per gram of water
Explanation:
Of the bonds listed below the weakest bond is _______ and the strongest is ________. A strong bond is a (stable / unstable) bond 2(H—C ≡ C—H) 5(O = O) → 4 (O—C—O) 2 (H—O—H) 839 kJ/mol C ≡ C.
Into which type of reaction would a scientist have to infuse a lot of energy in order to cause the reaction to occur?
A) highly endothermic
B) slightly exothermic
C) slightly endothermic
D) highly exothermic
Answer:
HIGHLY ENDOTHERMIC
Explanation:
Endothermic and exothermic reactions are based on energy absorption and energy release when the product formation occurs in a chemical reaction.
Highly endothermic reactions will need a lot of energy.
What are the endo and exothermic reactions?The reaction in which the reactants absorbs the heat and energy from the system it is present to for the products is called the endothermic reaction.
The chemical reaction in which the heat is produced when the products are created is called the exothermic reaction.
Therefore, option A is correct.
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A sample of iron contains 2.806 x 1024 atoms of iron (Fe). How many moles of iron are in the sample?
Answer:
Approx. 20 moles of iron.
Explanation:
There are approx. 6.022 x 10.23 iron atoms per mole of iron. In this quantity, The number of iron atoms has a mass of
55.85 ⋅ g.
Mark as Complete
Broken Bonds Quick Check
5 of 5
Use the reaction and bond information to answer the question.
dis a
ade of atoms that
electrons in two
when electrons are
e atoms then have
bond. A chemical
form. The breaking
reactions,
CH8 - CH + H2
Reactant bond energies: H-C = 413 kJ/mol, C-C single bond = 347 kJ/mol
Product bond energies: H-C 413 kJ/mol, C=C double bond = 614 kJ/mol, H-H-
432 kJ/mol
Based on the bond energies, is this reaction endothermic or exothermic? Why or why
not?
(1 point)
bonds of the
nergy is called the
nds are not all the
onds are easier to
ble and are harder to
ands,
This reaction is exothermic, because stronger bonds are broken than
formed
The reaction is exothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are broken than
formed
Based on bond energies, the reaction is endothermic, because stronger bonds are broken than formed.
What is the total change in bond energy?The total change in bond energy of a reaction is calculated using the formula below:
Total change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed.A reaction is exothermic if the total change in bond energy is negative meaning that stronger bonds are formed than broken.
A reaction is endothermic if the total change in bond energy is positive meaning that stronger bonds are broken than formed.
Given a reaction such as: C2H6 → C2H4 + H2
Sum of energies of bonds broken:
C-C + 6 × H-C
347 + 6 × 413
Sum of energy of bonds broken = 2825 kJ
Sum of energy of bonds formed:
C=C + 4 × H-C + H-H
614 + 4 × 413 + 432
Sum of energy of bonds formed = 2725 kJ
Total change in bond energy = 2825 - 2725
Total change in bond energy = 100 kJ
Since the value of total change in bond energy is positive, the reaction is endothermic.
Therefore, the reaction is endothermic, because stronger bonds are broken than formed.
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Using Boyle’s Law, calculate the new volume of the weather balloon at a higher altitude. Assume the volume of the balloon at ground level is 10.0 m3 where the atmospheric pressure is 1.00 atm. What will be its new volume at an altitude of 15 km where the atmospheric pressure is 0.350 atm?
Answer:
Explanation:
V1 = 10 m^3
P1 = 1.00 atmospheres
V2 = ?
P2 = 0.35
Formula
V1 * P1 = V2 * P2
Solution
10 * 1 = x * 0.35 Combine the left and divide both sides by 0.35
10/0.35 = x
x = 28.57 m^3
A chemist prepares a solution of copper) sulfate (cuso4)by weighing out 29.9 g of copper ) sulfate into a 150 into a 150.mLvolumetric flask and filling the flask to the mark with water.
Lol Most people would say c but its A
How many g are in 3 mol of Iron II Carbonate FeCO3
Answer:
348 g FeCO3
Explanation:Use your 3 mol's and find the atomic number of Iron II and CO3 which i think is 115.854 so you multiply it by the 3 and that should give you your grams in FeCO3.
Please help me
Continuing her study of soil, Mara wants to study the composition of some soil samples from two different regions of her state. She places one cup of each sample into a large jar. She slowly adds water until it is near the top. She stirs the water and the soil thoroughly, and then lets the soil sit overnight. She creates this image to record her results.
Compare the ratio of materials in the two soil samples and, based on your knowledge of soil formation, explain how the differences in soils possibly came about.
The soil in the first vessel that has the greatest amount of sand will be poor in organic matter while the other soil sample will be rich in organic matter.
What is soil?The soil is the outermost portion of the earth's crust on which plants grow. There are different types of soil such as;
Sandy soilClay soil Loamy soilHumus soilThe origin of each type of soil depends on the amount of organic matter that it contains. The soil in the first vessel that has the greatest amount of sand will be poor in organic matter while the other soil sample will be rich in organic matter.
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Answer:
the first jar is poor in nutriotion because it has less holding while the other is the oppossitye
Explanation:
What are the five qualifications a material must meet to be classified as a mineral?.
Answer:
5.1 Crystal structure and habit.
5.2 Hardness.
5.3 Lustre and diaphaneity.
5.4 Colour and streak.
5.5 Cleavage, parting, fracture, and tenacity.
5.6 Specific gravity.
5.7 Other properties.
which macromolecules has a nitrogen base and phosphate found in its structure?
Answer:
A nucleic acid
Explanation: A nucleic acid is a polymeric macromolecule made up of repeated units of monomeric 'nucleotides' composed of a nitrogenous heterocyclic base which is either a purine or pyrimidine, a pentose five-carbon sugar either ribose or 2′-deoxyribose, and one to three phosphate groups.
how large a volume is needed to contain 21 germs of sliver
Density is a physical property of a substance that represents the mass of that substance per unit volume. It is a property that can be used to describe a substance. We calculate the volume as follows:
21 grams Ag ( 1 L / 10.5 grams ) = 2 L of container is needed for the given mass of silver
Hope this answers the question. Have a nice day.
Which type of chemical bond occurs when atoms share electrons, as shown in this diagram?.
Answer:
covalent bond
Explanation:
covalent bond, in chemistry, the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.
difference between a compound and a mixture , Simple and short answer please!!
Please help asap chemistry homework
Answer:
(See attachment below)
Explanation:
Answer: 4. 5.15 Moles
5. 6.02×10 atoms
. 7. 1.3545×10^23 atoms
8. 1.73075×10^22 atoms
. 10. 3.40499×110 atoms
MARKING BRAINLEIST + 20 POINTS Explain why energy must be added to a solid to cause it to melt?
Energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart so that the molecules can move around at comparable kinetic energies
Identify the volume the gas will occupy at STP: 12.12 moles of O2
This problem is providing us with the number of moles of oxygen in a gas sample as 12.12 mol. Thus, the volume those moles occupy is required and found to be 271.5 L.
Ideal gasesIn chemistry, we study ideal gases under the assumption of no interactions among gas molecules, therefore the widely accepted equation, known as the ideal gas equation, we use to study the moles-pressure-temperature-volume relationship is:
[tex]PV=nRT[/tex]
Now, this problem gives n and asks for V at STP, which stands for standard temperature and pressure, taking the values of 273 K and 1 atm, respectively. Hence, we solve for the volume as follows:
[tex]V=\frac{nRT}{P}[/tex]
Thereafter, we plug in the numbers to obtain:
[tex]V=\frac{12.12mol*0.08206\frac{atm*L}{mol*K}*273K}{1atm}\\\\V=271.5L[/tex]
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A 10 kg shotgun accelerates 0.025 kg of buckshot from rest to a speed of 100 m/s in a distance of just 0.5 m. How much force is used to accelerate the shot? How much force does the gun recoil with?
Answer:
v'2 is the final velocity of the bullet
Explanation:
I had the question and found it on Chegg so credits to him/her
What information is provided by the specific block location of an element?.
The block location of an element tells the energy sublevel of an element.
What is block location of an element?The term block location refers to the specific block in which an element is found in the periodic table. There are three blocks in the periodic table which are;
s - blockp - blockd - block and f - blockThe block location of an element tells the energy sublevel of an element.
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