Answer:
a. pH raises
b. pH neutral
c. pH raises
Explanation:
First of all we need to dissociate these compounds.
Ca(OH)₂ → Ca²⁺ + 2OH⁻
This is the calcium hydroxide, a strong base.
In this case, we are giving OH⁻ to medium, so the pH will be increased.
OH⁻ + H⁺ ⇄ H₂O
Hydroxides will neutralize the protons in order to make water, but if we have many OH, we talk about a basic solution where pH is lower than 7.
b. CuBr → Cu⁺ + Br⁻
This is similar to NaCl, a ionic salt which is neutral.
The ions from this salt, do not make hydrolisis, that's why pH does not change.
c. Ca₃(PO₄)₂ → 3Ca²⁺ + 2PO₄⁻³
Calcium cathion comes from a strong base. It means, that the ion can not make hydrolisis because it is the conjugate weak acid.
Phosphate anion comes from a weak acid, it can gives OH⁻ to medium so pH will increase; the PO₄⁻³ anion is the conjugate strong base of the phosphoric acid, that's why it can react:
PO₄⁻³ + H₂O ⇄ H₂PO⁻² + OH⁻
Is ionization complete or incomplete when sodium hydroxide compounds are dissolved in water and why?
Answer: Ionization is complete when sodium hydroxide compound is dissolved in water as it is strong electrolyte.
Explanation:
Strong bases are good electrolytes as they completely dissociate to give ions which help in the conduction of electrical current.
Weak bases are those substances which dissociate partially to give hydroxide ions [tex](OH^-)[/tex] when dissolved in water.
Example: [tex]NH_4OH\rightleftharpoons NH_4^++OH^-[/tex]
Strong bases are those substances which dissociate completely to give hydroxide ions [tex](OH^-)[/tex] ions when dissolved in water.
Example: [tex]NaOH\rightarrow Na^++OH^-[/tex]
When sodium hydroxide (NaOH) compounds are dissolved in water (H₂O), ionization takes place completely.
What is ionization?Ionization is a process, where compound on dissociation coverts into ions.
Dissociation of NaOH takes place as follow:
NaOH → Na⁺ + OH⁻
Here NaOH, is a strong electrolyte or strong base which completely dissociate into ions and never combine to again form NaOH. Whereas weak electrolytes are those which partially dissociate into ions and gives reaction like as:
AB ↔ A⁺ + B⁻
Complete ionization takes place when sodium hydroxide compounds are dissolved in water.
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HCl (aq) + H2O (l) ⇌ H3O^+ (aq) + Cl^- (aq)
In 1.0 M HCl (aq), is nearly 100 percent dissociated, as represented by the equation above. Which of the following best helps to explain why, in 0.01 M HCN (aq), less than 1 percent of HCN is dissociated?
A. Compared to the HCl (aq) solution, the concentration of the HCN (aq) solution is much too dilute to achieve 100 percent dissociation.
B. The CN^- ion is not very soluble in water, and a solid precipitate would form if more of the HCN dissociated..
C. The equilibrium constant for the dissociation of HCN (aq) is much smaller than that for the dissociation of HCl (aq).
D. HCN (aq) reacts with water to form a basic solution, and the high concentration of OH^- (aq) interferes with the dissociation process.
There is lesser dissociation of hydrogen cyanide as compared to HCl, as equilibrium constant for the dissociation of hydrogen cyanide has been smaller than HCl. Hence, option C is correct.
Hydrogen cyanide has been a weak acid that has been dissociated into the constituent ions. The dissociation of the compound in water has been corresponds to the equilibrium constant.
Equilibrium constant for hydrogen cyanide and HClThe equilibrium constant has been defined as the ratio of the concentration of solute and solvent ions at equilibrium.
The sample with lesser equilibrium constant tends to dissociate at lesser concentration as well.
The equilibrium constant for the dissociation of hydrogen cyanide has been smaller than HCl. Thus, there will be lesser dissociation of hydrogen cyanide as compared to HCl. Hence, option C is correct.
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Question 5
2 pts
How many atoms of helium are found in a helium balloon if it has 3.9g of helium
inside?
The answer should be
x1023
Type the number that precedes the x1023
Answer: There are [tex]6.2\times 10^{23}[/tex] atoms of helium are found in a helium balloon if it has 3.9 g of helium inside.
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{3.9g}{4.00g/mol}=0.975moles[/tex]
1 mole of helium contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus 0.975 moles of helium contain = [tex]\frac{6.023\times 10^{23}}{1}\times 0.975=6.2\times 10^{23}[/tex] atoms
nitrophenol is more acidic than phenol.
Answer:
The p- nitrophenol is more acidic than phenol because the deactivating nature of nitro group and after loosing the protons it makes more resonance stabilization as nitro group is having strong deactivating nature so it attracts electrons towards it.
Which of the following is not a valid conversion factor?
Answer:
d
Explanation:
how many litres of hydrogen is present in 12 grams of hydrogen
Answer:
10 the power of 23 hydrogen atom
According to Markovnikov's rule of the electrophilic addition to an alkene, the electrophile, usually a proton, is more likely to add to the ___________ in a double bond. This arrangement places the intermediate carbocation on the ________ , which stabilizes it with the presence of _________. In the major product of a reaction following Markovnikov's rule, the___________ will then end up on the more-substituted carbon in a double
Answer:
Explanation:
To fill in the gaps with the appropriate words, we need to rewrite the whole text in the question while adding the right answers to it.
[tex]According \ to \ Markovnikov's \ rule \ of \ the \ electrophilic \ addition \ to \ an \ alkene, \\ \\ the \ electrophile, \ usually, \ a \ proton, \ is \ more \ likely \ to \ add \ to \ the \ \mathbf{less \ substituted \ carbon} \\ \\ \ in \ a \ double \ bond.[/tex]
[tex]This \ arrangement \ place \ the \ intermediate \ carbocation \ on \ the \ \mathbf{more \ substituted \ carbon.}[/tex][tex]Which \ stabilizer \ it \ with \ the\ presence \ of \ \mathbf{more \ substituents} \ the \ major \ product \ of[/tex]
[tex]the \ reaction \ following \ markovnikov \ rules \ the \ \mathbf{nucleophile} \ will \ then \ end \ up[/tex]
[tex]with \ the \ m ore \ substituted \ carbon \ in \ the \ double \ bond.[/tex]
HELP!!! TIMED! THANK YOU!
Answer:
The answer is A.
Explanation:
Answer:
Explanation:
I believe it is a
What animal has a see through body?
2NH3+2O2- N2o+3H2O
If 80.0 grams of O2 are reacted in the above reaction,how many grams of N2O will be produced?
Answer:
55.025g of N2O
Explanation:
2 NH3 + 2 O2 → N2O + 3 H2O
moles of O2 = 80.0/32 = 2.5 moles O2
moles of N2O = 2.5 moles O2 * 1 mole N2O
= 1.25 moles N2O
moles = mass/Molar mass
mass = moles * Molar mass = 1.25 x 44.02 = 55.025 g
chemical formula for calculating pressure
Answer:
First, let's review the ideal gas law, PV = nRT. In this equation, 'P' is the pressure in atmospheres, 'V' is the volumes in liters, 'N' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas constant (0.0821 liter atmosphere per moles Kelvin).
Explanation:
I majored in Chemistry
State the postulate of Bohr theory
Answer:
Bohr's model of the hydrogen atom is based on three postulates:
1) An electron moves around the nucleus in a circular orbit,
2) An electron's angular momentum in the orbit is quantised,
3) The change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon. Bohr's model is semi-classical because it combines the classical concept of electron orbit (postulate 1) with the new concept of quantisation ( postulates 2 and ).
Dos Identy each statement whether TRUE or FALSE. Write you answer m
1. Mammals are warm blooded animals that are born alive.
2. Reptiles are cold blooded vertebrates that are hatched from egs.
3. Vertebrates have no economic importance to our environment.
4. There is a significant relationship between vertebrates
5. Invertebrate animals are important to human beings.
and invertebrates.
Answer:
1=true
2=false
3=false
4=true
5=true
10. How might life in America be different if the Civil Rights Movement had never happened?
a. Public places could still be segregated
b. Voting would be easier for everyone
c. Slavery might still exist
d. Americans would be more tolerant of peaceful protests
Answer: A or C because of the civil right movement changed a lot of stuff as if it never happened blacks would of still be segregated, the U.S wouldn't be the same and they also mentioned that the U.S would not be respected by many other countries which would hurt them from developing even more in the future.
what is the overall equilibrium constant of 4NH3+7O2=4NO2+6H2O
Answer:
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation:
WHEN TWO CARBONS FORM A DOUBLE BOND IT IS CALLEDD AN
Answer:
A carbon–carbon bond is a covalent bond between two carbon atoms. ... Carbon atoms can also form double bonds in compounds called alkenes or triple bonds in compounds called alkynes. A double bond is formed with an sp2-hybridized orbital and a p-orbital that is not involved in the hybridization.
Explanation:
Which of the following molecules is least soluble in water?
Answer:
CCl4
Explanation:
Because it is non polar and non polar substances are insoluble in water.
The molecule which is least soluble in water is C(Cl)₄
Which molecules are soluble in water?Water is polar molecule and only polar molecules are soluble in water.
(CH₃)₂CO is a polar molecule as due to partial positive and negative charges on carbon and oxygen atom as a result of which it is soluble in water.C(Cl)₄ is a non polar molecule as net dipole moment of the molecule is zero, so it is insoluble in water.CH₃OH is also polar molecule and shows solubility in water.(CH₃)₂O is also polar and dissolve in water.Hence tetra chloro carbon is insoluble in water.
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Sodium benzoate, the sodium salt of benzoic acid, is used as a food preservative. A sample containing solid sodium benzoate mixed with sodium chloride is dissolved in 50.0 mL of .5 M HCl, giving an acidic solution (benzoic acid mixed with HCl ). This mixture is then titrated with .393 M NaOH. After the addition of 46.50 mL of the solution, the pH is found to be 8.2. At this point, the addition of one more drop ( .02 mL) of NaOH raises the pH to 9.3 . Calculate the mass of sodium benzoate (NaC6H5COO) in the original sample. (Hint: At the equivalence point, the total number of moles of acid [here HCl] equals the total number of moles of base [here, both NaOH and NaC6H5COO]
Answer:
Protegerte Freddy Gerrard Reverte Freddy Buffett irrefutables
Explanation:
Princesa fashion casadas libres
What the mechanisms of action of acidic acid with asprin
Synthesis. The synthesis of aspirin is classified as an esterification reaction. Salicylic acid is treated with acetic anhydride, an acid derivative, causing a chemical reaction that turns salicylic acid's hydroxyl group into an ester group (R-OH → R-OCOCH3).
hope it's help
#carryONlearningWhat might be one potential solution for eliminating the crown-of-thorns starfish from the Great Barrier Reef?
introducing a predator to eat the starfish
eliminating their food supply to starve them
introducing a different species that outcompetes them
hunting or culling by humans
Answer:
hunting or culling by humans
Explanation:
The hunting will decrease the starfish
The empirical formula of a sample of gold bromide was found by adding aluminum metal to an aqueous solution of gold bromide, displacing gold metal.
a. True
b. False
Answer:
a. True
Explanation:
The formula for determining the gold bromide formula, aqueous solution is added. When the solution is introduced with aluminum metal, the gold bromide reacts and displaces the gold metal. This is an electrolysis technique which is used for metals.
A tank contains one hundred fifty kmol of an aqueous phosphoric acid solution with 5.00 mole% H3PO4. The solution is concentrated by adding pure phosphoric acid at a rate of 30.0 L/min. Molecular weight of phosphoric acid is 98. Density of phosphoric acid is 1.834 kg/L. Determine the mole fraction of phosphoric acid in the tank at 25 minutes.
Answer:
Mole fraction = 0.1313
Explanation:
given data
Addition rate of pure phosphoric acid = 30L/min
Phosphoric acid added in 25 min = 750 L
solution
mass is express as here
mass = density × volume and number of moles = mass ÷ molar mass
So, In terms of moles
phosphoric acid added = (750 × 1.834) ÷ 98
phosphoric acid added = 14.036 kmol
and
moles of phosphoric acid in tank = 0.05 × 150 + 14.036
moles of phosphoric acid in tank = 21.536 kmol
and
Moles of water in tank = 0.95 × 150
Moles of water in tank = 142.5 kmol
So that Mole fraction of phosphoric acid in tank
Mole fraction = 21.536 ÷ (21.536+142.5)
Mole fraction = 0.1313
Ve. In what layer do weather balloons fly?
Earth layers
Answer:
stratosphere
Explanation:
what are called conductors of electricity
Answer:
Some materials let electricity pass through them easily. These materials are known as electrical conductors. Many metals, such as copper, iron and steel, are good electrical conductors.
I hope it's helpful!
Plsss help
a. Given that the density of oxygen is 1.439 g/L, how many liters of oxygen gas
can be produced if 5.0 moles of mercury (II) oxide are heated?
Helpppppp plsssssssss
Answer:
air,water,rocks,and the ibex
Explanation:
these are the non living things I'm pretty sure
HELP ASAP PLS. The melting of a glacier is an example of the interactions among which of Earth’s spheres?
A. geosphere, troposphere, cryosphere
B. atmosphere, geosphere, cryosphere
C. atmosphere, asthenosphere, biosphere
D. hydrosphere, asthenosphere, atmosphere
Answer:
d. hydrospher, asthenosphere, atmosphere
Answer:
its actually b atmosphere, geosphere, cryosphere atmosphere
Explanation: atmosphere is most likely the heat in the air or the water evaporating , cryosphere is the ice that forms the glaciers. and thats how i know im not sure about geosphere but i know its none of the others ones hope this helps :D
john roller skates with a constant speed of 8 miles per hour. how long will he take to travel a distance of 28 miles? please use the formula Speed = Distance/Time
Answer:
3.5hrs
Explanation:
Using the formula Speed = Distance/Time
Given
Speed = 8mi/hr
Distance = 28miles
Get the time
Time = Distance/Speed
Time = 28/8
Tme = 3.5hrs
Hence it will take 3.5hrs to travel
3. What is an
electrolyte?
Answer:
An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. ... A substance that dissociates into ions in solution acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, magnesium, and phosphate are examples of electrolytes.
Explanation:
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what is used to create motion
Answer:
These forces make objects change their motion or movement , the act of going from one place to another.
Explanation: