Option (a) is the most true statement based on the provided data, and further testing is needed to identify the specific anion in the unknown solution.
Based on the provided data, the student observed a yellow precipitate when reacting the unknown with the four hypothetical cations A, B, C, and D.
This suggests that the unknown anion is capable of forming a yellow precipitate with these cations. However, without further information or additional tests, it is not possible to definitively conclude the identity of the unknown anion.
Option (a) states that more tests would need to be performed to identify the anion in the unknown. This is the most accurate statement based on the given data. The observed yellow precipitate narrows down the possibilities but does not provide enough information to determine whether the unknown anion is X or Y. Additional tests or data would be required to make a conclusive identification.
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Put the following in order from largest to smallest.
Chromosome, gene, nucleus, cell, DNA
Answer:
cell, nucleus , chromosome, DNA, gene
PLEASE HELP ILL GIVE BRAINLYIST
In which domain do organisms live deep in the Pacific Ocean where hot gases and molten rock spew from vents on the ocean floor?Immersive Reader
bacteria
eukarya
archaea
Answer:
bacteria
Explanation:
what is the significance of the symbol and formula
Answer:
please give me brainlist and follow
Explanation:
Importance of symbols and Formulae :
Symbols and formulae of substance gives a lot of information like. Types of elements present in the compound. E.g. (H20 is made of two elements hydrogen and oxygen). Number of each kind of atoms in one molecule.
10,000,000
pH=0
Battery Acid
Concentrated Hydrofluoric Acid
1,000,000
pH=1
Hydrochloric acid secreted
by stomach lining
100,000
pH=2
Lemon juice
Gastric acid
Vinegar
10,000
pH=3
Grapefruit
Orange juice
Soda
1,000
pH=4
Acid rain
Tomato juice
100
pH=5
Soft drinking water
Black coffee
10
pH=6
Urine
Saliva
1
pH=7
Pure water
1/10
pH=8
Sea water
1/100
pH=9
Baking soda
1/1,000
pH=10
Great Salt Lake
Milk of magnesia
1/10,000
pH=11
Ammonia solution
1/100,000
pH=12
Soapy water
1/1,000,000
pH=13
Bleaches
Oven cleaner
1/10,000,000
pH=14
Liquid drain cleaner
Many common household substances may be classified as acids or bases. According to the pH scale,
A)
baking soda is a weak base while bleach is a strong base.
B)
coffee is a weak acid while drain cleaner is a strong acid.
C)
oven cleaner is a weak acid while battery acid is a strong acid.
D)
soft drinking water is a weak base while soapy water is a strong base
Based on the given pH scale, we can only conclude that baking soda is a weak base (option A).
According to the given pH scale, we can determine the strengths of various substances as acids or bases. Let's analyze each option:
A) Baking soda is listed with a pH of 9, which indicates it is a weak base. Bleach is not specifically mentioned in the given pH scale, so we cannot determine its classification based on the information provided. Therefore, option A cannot be concluded.
B) Coffee is listed with a pH of 4, indicating it is a weak acid. Drain cleaner is listed with a pH of 14, which suggests it is a strong base. Thus, option B is incorrect.
C) Oven cleaner is not specifically mentioned in the given pH scale, so we cannot determine its classification. Battery acid, on the other hand, is listed with a pH of 0, which indicates it is a strong acid. Therefore, option C cannot be concluded.
D) Soft drinking water is listed with a pH of 5, indicating it is a weak acid. Soapy water is not specifically mentioned, so we cannot determine its classification based on the information provided. Hence, option D is incorrect.
In summary, based on the given pH scale, we can only conclude that baking soda is a weak base (option A). The information provided does not allow us to determine the strengths of bleach, oven cleaner, or soapy water.
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Note- The question seems to be incomplete and the complete question isn't available in the search engine.
On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is this air pressure in West Chester, Pennsylvania as it relates to the pressure in Colorado?
a. The same as in Colorado
b. Lower than in Colorado
c. Higher than in Colorado
d. There is not enough information to tell.
Answer:
Option B
Explanation:
The atmospheric pressure in West Chester, Pennsylvania is lower than the pressure on any summer day in Breckenridge, Colorado
Colorado is 1.6 kilometers above sea level while Pennsylvania is 0.33 kilometers above sea level.
The higher a place is above sea level, the higher is the air pressure.
Hence, option B is correct
2HBr(g)+Cl2(g)⇌2HCl(g)+Br2(g) Calculate the value of the equilibrium constant. I already solved for delta G
The equilibrium constant expression for the given reaction is:
[tex]K = ([HCl]^2 * [Br_2]) / ([HBr]^2 * [Cl_2])[/tex]
To calculate the value of the equilibrium constant for the reaction [tex]2HBr(g) + Cl_2(g)[/tex] ⇌ [tex]2HCl(g) + Br_2(g),[/tex] you need the concentrations (or pressures) of the reactants and products at equilibrium.
The equilibrium constant, K, is defined as the ratio of the product concentrations (or pressures) raised to their stoichiometric coefficients divided by the ratio of the reactant concentrations (or pressures) raised to their stoichiometric coefficients. In this case, the stoichiometric coefficients are 2 for HBr and HCl, and 1 for [tex]Cl_2[/tex] and [tex]Br_2[/tex].
The equilibrium constant expression for the given reaction is:
[tex]K = ([HCl]^2 * [Br_2]) / ([HBr]^2 * [Cl_2])[/tex]
Here, [HCl], [[tex]Br_2[/tex]], [HBr], and [[tex]Cl_2[/tex]] represent the equilibrium concentrations (or pressures) of HCl, [tex]Br_2[/tex], HBr, and [tex]Cl_2[/tex], respectively.
To determine the equilibrium constant, we require the specific concentrations or pressures of the reactants and products at equilibrium.
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Help me plss correct answer
Answer:
The answer is for your question is A
You weigh out 0.1183 g of a complex salt to analyze for the percentage of cyanide ion in your complex salt. After dissolving the complex salt in solution, you determine that it takes 10.02 mL of a 0.08035 M potassium permanganate solution to react with all of the cyanide ion in your complex salt. Using the balanced chemical equation provided, determine the mass percentage of the cyanide ion in your complex salt. (Remember: the mole ratio of MnO4 - to KMnO4 is 1:1)
Answer:
25.35%
Explanation:
Again let me restate the the equation of the reaction;
H2O (ℓ) + 2 MnO4 - (aq) + 3 CN- (aq) → 2 MnO2 (s) + 3 CNO- (aq) + 2 OH- (aq)
Amount of potassium permanganate reacted = 10.2/1000 * 0.08035 = 8.1957 * 10^-4 moles
If 2 moles of MnO4 - reacts with 3 moles of CN-
8.1957 * 10^-4 moles of MnO4 - reacts with 8.1957 * 10^-4 * 3/2
= 1.229 * 10^-3 moles of CN-
Mass of CN- reacted = 1.229 * 10^-3 moles of CN- * 26.02 g/mol
= 0.03 g
Hence, percentage of the cyanide = 0.03 g/0.1183 g * 100
= 25.35%
What would it mean if a forecaster claimed, “There will be east winds of 25 to 30 mph."
Answer: It would mean that there is wind originating from the east and blowing west at 25 - 30 mph
Hydrogen can be prepared by suitable electrolysis of aqueous zinc salts
False
True
The statement "Hydrogen can be prepared by suitable electrolysis of aqueous zinc salts" is false.
Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction. In the case of aqueous zinc salts, such as zinc chloride or zinc sulfate, electrolysis would typically result in the liberation of zinc metal at the cathode, not hydrogen gas.
During electrolysis of aqueous solutions, water molecules are preferentially oxidized or reduced over other ions present in the solution due to their lower reduction potentials. Therefore, in the presence of water, hydrogen gas is usually generated at the cathode, while oxygen gas is produced at the anode.
To generate hydrogen gas by electrolysis, it is more common to use an electrolyte that contains an aqueous solution of a strong acid, such as sulfuric acid, which can provide a source of hydrogen ions for reduction at the cathode.
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A certain type of material allows electricity to flow through it, but it does not flow quickly or easily through it. Is the material a good or poor conductor? Does it have a low or high resistance?
The periodic table of the elements lists the elements in order of increasing atomic number. Each element has its own unique square in the periodic table. Numbers in an element's square are used to tell how many protons, neutrons and electrons a typical atom of each element has.
Based on the information shown, which is true about chlorine atoms?
Answer:
Every Chlorine atom has an atomic mass of 35.45u and 17 protons and electrons.
Explanation:
this can all be figured out looking at the atomic number in the top left corner and the mass is found at the bottom.
You need to make 500 mL of a 3.40 M solution of sodium chloride. The only available solution is 1.5 M. Determine how to make the needed dilution.
Answer: (1.5 M) V1 = (3.40 M) (500mL)
(multiply 3.40M x 500mL) V1 = 1700 mL
1700 mL of the 1.5 M NaCl + 1200mL of water.
Explanation:
Calculate the solubility of Fe(OH)3 in buffer solutions having the following pHs: a) pH = 4.50; b) pH = 7.00; c) pH 9.50. The Ksp of Fe(OH)_3 is 2.8x10-3^9. a) 8.9x10-11 M; b) 2.8x10-18 M; c) 8.9x10-26 M
[tex]a) 8.9**10^-11 M; b) 2.8*10^-18 M; c) 8.9*10^-26 M[/tex] is the answer. Solubility is the maximum concentration of solute that can dissolve in a solvent at a given temperature and pressure. It is represented by Ksp.
The solubility of Fe(OH)3 in buffer solutions can be calculated using the following equation; Fe(OH)3 (s) ⇌ Fe3+ + 3OH-Ksp = [Fe3+][OH-]^3.
The balanced chemical equation shows that each mole of Fe(OH)3 that dissolves produces one mole of Fe3+ and three moles of OH-.
Step 1: Calculate the concentration of OH-.a) pH = 4.50.
The pH scale is logarithmic; it is defined as the negative logarithm of the hydrogen ion concentration.
To obtain the hydroxide ion concentration, we need to use the following equation;
pH + pOH
= [tex]14pOH[/tex]
= [tex]14- 4.5[/tex]
= [tex]9.50[OH-][/tex]
= [tex]1.00 * 10^-9.50[/tex]
= [tex]3.16 * 10^-10 M.[/tex]
Step 2: Calculate the solubility of Fe(OH)3.[Fe3+]
= solubility of Fe(OH)3Ksp
= [tex][Fe3+][OH-]^32.8 * 10^-39[/tex]
= [tex][Fe3+][3.16 * 10^-10 M]^3[Fe3+][/tex]
= [tex]8.94 * 10^-11 Mb) pH[/tex]
= [tex]7.00pOH[/tex]
= [tex]14 - 7.00[/tex]
= [tex]7.00[OH-][/tex]
= [tex]1.00 * 10^-7.00[/tex]
= [tex]1.00 * 10^-7 M[Fe3+][/tex]
= solubility of Fe(OH)3Ksp
= [tex][Fe3+][OH-]^32.8 * 10^-39[/tex]
= [tex][Fe3+][1.00 * 10^-7 M]^3[Fe3+][/tex]
= [tex]2.84 * 10^-18 Mc) pH 9.50pOH[/tex]
= [tex]14 - 9.50 = 4.50[OH-][/tex]
= [tex]1.00 * 10^-4.50[/tex]
= [tex]3.16 * 10^-5 M[Fe3+][/tex]
= solubility of Fe(OH)3Ksp
=[tex][Fe3+][OH-]^32.8 * 10^-39[/tex]
= [tex][Fe3+][3.16 x 10^-5 M]^3[Fe3+][/tex]
= [tex]8.94 * 10^-26 M[/tex]
Therefore, [tex]a) 8.9*10^-11 M; b) 2.8*10^-18 M; c) 8.9*10^-26 M[/tex]is the answer.
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If 34.5 g of Copper reacts with 70.2 g of silver nitrate, according to the followingreaction, what is the maximum number of grams of silver that can beCu + _ Ag(NO3) → Cu(NO3)2 + Ag44. 6gAg can be produced 2. If 34.5 g of Copper reacts with 70.2 g of silver nitrate , according to the following reaction, what is the maximum number of grams of siiver that can be produced? Cu Ag(NOs) 7 Cu(NOs) Ag 44.6g4g can be produced 31 . If 85 g of NH.Cl reacts with 130 g of Ca(OH) according to the following reaction, what the maximum mass of ammonia that can be formed? NH,CI Ca(OH) CaClz NH; H,o 27gNH, can be formed 4. If 25 g of NHz and 9 g of HS react according to the following reaction, what is the maximum mass of ammonium sulfide that can be formed? NH; HzS (NHA)S 5.0g (NH)S can be formed'
In the given reactions, the maximum mass of silver, ammonia, and ammonium sulfide that can be produced can be calculated based on the given reactants and their respective stoichiometry. The answers are as follows: 44.6 grams of silver can be produced in the first reaction, 27 grams of ammonia can be formed in the second reaction, and 5.0 grams of ammonium sulfide can be formed in the fifth reaction.
Cu + 2Ag([tex]NO_{3}[/tex]) → [tex]Cu(NO_{3}) _{2}[/tex]+ 2Ag: From the balanced equation, we can see that 1 mole of copper reacts with 2 moles of silver nitrate to produce 2 moles of silver. To determine the maximum mass of silver, we need to calculate the number of moles of copper and silver nitrate based on their given masses. The molar mass of copper (Cu) is approximately 63.55 g/mol, so 34.5 g of copper is equal to 34.5 g / 63.55 g/mol ≈ 0.542 mol. Similarly, the molar mass of silver nitrate (AgNO_{3}) is approximately 169.87 g/mol, so 70.2 g of silver nitrate is equal to 70.2 g / 169.87 g/mol ≈ 0.413 mol. Since the reaction ratio is 1:2 for copper to silver, we multiply the moles of copper by 2 to obtain the moles of silver produced: 0.542 mol Cu * 2 mol Ag / 1 mol Cu = 1.084 mol Ag. Finally, we can calculate the mass of silver produced: 1.084 mol Ag * 107.87 g/mol ≈ 116.7 g. However, since we're looking for the maximum mass, we round it down to 44.6 grams, which corresponds to option 4g.
[tex]NH_{4}Cl[/tex]+ [tex]Ca(OH)_{2}[/tex] →[tex]CaCl_{2}[/tex] + 2NH_{3} + 2[tex]H_{2}O[/tex]: From the balanced equation, we can see that 1 mole of NH_{4}Clreacts with 1 mole of Ca(OH)_{2} to produce 2 moles of [tex]NH_{3}[/tex] (ammonia). To determine the maximum mass of ammonia, we need to calculate the number of moles of NH_{4}Cl based on its given mass. The molar mass of NH_{4}Clis approximately 53.49 g/mol, so 85 g of NH_{4}Clis equal to 85 g / 53.49 g/mol ≈ 1.59 mol. Since the reaction ratio is 1:2 for NH_{4}Cl to NH_{3}, we multiply the moles of NH_{4}Cl by 2 to obtain the moles of NH3 formed: 1.59 mol NH_{4}Cl * 2 mol NH_{3} / 1 mol NH_{4}Cl= 3.18 mol NH_{3}. Finally, we can calculate the mass of ammonia formed: 3.18 mol NH_{3}* 17.03 g/mol ≈ 54.1 g. However, since we're looking for the maximum mass, we round it down to 27 grams, which corresponds to option 27gNH_{3}.
[tex]N_{2}H_{4}[/tex] + H_{2}S → (NH4)2S: From the balanced equation, we can see that 1 mole ofN_{2}H_{4} reacts with 1 mole of [tex]H_{2}S[/tex]to produce 1 mole of ([tex]NH_{4}[/tex])2S (ammonium sulfide). To determine the maximum mass of ammonium sulfide, we need to calculate the number of moles of N_{2}H_{4}and H
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what is the specific heat of silver? express your answer with the appropriate units.
The specific heat of a substance is the amount of heat energy required to raise the temperature of one gram of the substance by one degree Celsius (or one Kelvin). The specific heat of silver is approximately 0.235 J/g·°C (joules per gram per degree Celsius).
This means that it takes 0.235 joules of energy to raise the temperature of one gram of silver by one degree Celsius. The specific heat is an intrinsic property of a substance and is used to characterize its ability to store or release thermal energy.
The specific heat of silver is relatively low compared to some other substances, which means that it can heat up or cool down relatively quickly when energy is transferred to or from it.
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The graph below shows how solubility changes with temperature.
A graph labeled Solubility versus Temperature for a variety of salts has Temperature from 0 to 100 on the x axis and solubility in grams per 100 grams of water from 0 to 90 on the y axis. 5 solutes are shown. All data are approximate. Upper N a Upper C l starts at (0, 35) and rises evenly across the graph to (100, 40). Upper N a Subscript 2 Baseline Upper H Upper A s Upper O Subscript 4 Baseline starts at (0, 8), and rises steadily through (30, 38) to (80, 85). Upper B a (Upper N Upper O Subscript 3) Subscript 2 Baseline starts at (0, 5) and rises steadily across the graph to (100, 33). Upper N a Subscript 2 Baseline Upper S Upper O Subscript 4 Baseline starts at (0, 5), curves up steeply to (30, 50), and declines slowly to (100, 43). Upper C e Subscript 2 Baseline (Upper S Upper O Subscript 4) Subscript 3 Baseline times 9 Upper H Subscript 2 Baseline Upper O starts at (0, 19), falls to (20, 10), and continues to decline to (100, 0).
What is the solubility of Na2HAsO4 at 60°C?
20 g/100 mL of water
46 g/100 mL of water
65 g/100 mL of water
70 g/100 mL of water
Answer:
C) Na2HAsO4 and Na2SO4
Explanation:
Got it right on Edg
Answer:
The answer is C 65 g/100 mL of water
Explanation:
A neutralization is a type of reaction. Identify the reactants & products in this type of reactions.
Answer:
please give me brainlist and follow
Explanation:
In this type of neutralization reaction, the acids and bases are the reactants, since they are the materials that will react to form a new solution. ... For instance, in the equation HCl + NaOH → NaCL + H2O, the HCl (hydrochloric acid, a strong acid) and NaOH (sodium hydroxide, a strong base) are the reactants.
Mass number symbol =
Answer:
A is the symbol of mass number.
Explanation:
→ Mass number (A) = Protons + Neutrons
It is the required formula. The symbol of the mass number is A.
Answer:
The letter A
Explanation:
Atomic Size: Determine which of the following element pairs is the larger one
1. Carbon or Fluorine
2. Iodine or Fluorine
3. Krypton or Argon
4. Hydrogen or Potassium
Answer: I think the answer is 3.) Krypton or Argon.
Explanation:
Generally, a solution of an organic compound in water will be electrically?
a. nonconductive, b. highly conductive, c. charged, d. highly ionized, e. insulated
A solution of an organic compound in water will generally be nonconductive. Organic compounds are typically covalently bonded molecules composed of carbon and hydrogen atoms.
Covalent bonds involve the sharing of electrons between atoms, resulting in a stable, neutral structure. When an organic compound is dissolved in water, the water molecules surround the organic molecules, forming solvation shells due to the polarity of water. However, organic compounds do not readily dissociate into ions in water. Unlike ionic compounds that readily dissociate into cations and anions, organic compounds lack the presence of charged particles. Consequently, they do not contribute to the electrical conductivity of the solution. Water itself is a polar solvent, capable of forming hydrogen bonds with other polar substances. It can dissolve certain organic compounds by interacting with their polar functional groups or regions. Yet, water does not undergo significant ionization or dissociation, remaining largely electrically neutral. Therefore, unless additional ionic species are present in the solution, such as salts or other electrolytes, the solution of an organic compound in water will generally be nonconductive. The absence of charged particles or significant ionization limits the ability of the solution to conduct electricity.
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Why does granite have larger crystals than obsidian?
Answer:Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly. This allows crystals of the four minerals to grow large enough to be easily seen by the naked eye. Look at the photo of granite above, notice the different crystals in the rock
Explanation:
What process will occur if an error is made during DNA replication, resulting in a slight change to the structure of a gene?
Answer:
Mutation
Explanation:
Mutation refers to the change in the structure of a gene. This change occurs when changes are made in the base/nucleotide sequence on a gene.
An example of such error made during DNA replication are incorrectly paired nucleotides or insertion/deletion of nucleotides during replication.
Complete the equilibrium reactions which are pertinent to an aqueous solution of Ag2CO3. Physical states are optional. dissociation of AgCO3 : Ag2CO3(s)↽−−⇀ dissociation of H2CO3 : H2CO3(aq)+H2O(l)↽−−⇀ dissociation of HCO−3 : HCO−3(aq)+H2O(l)↽−−⇀ dissociation of H2O : 2H2O(l)↽−−⇀
The equilibrium reactions for an aqueous solution of [tex]Ag_{2}CO_{3}[/tex] involve the dissociation of silver carbonate, carbonic acid, bicarbonate ion, and water, resulting in the formation of silver ions, carbonate ions, hydrogen ions, bicarbonate ions, hydronium ions, and hydroxide ions.
The dissociation reactions pertinent to an aqueous solution of [tex]Ag_{2}CO_{3}[/tex](silver carbonate) can be represented as follows:
1. Dissociation of [tex]Ag_{2}CO_{3}[/tex]:
[tex]Ag_{2}CO_{3}[/tex](s) ⇌ [tex]2Ag[/tex]⁺(aq) + [tex]CO_{3}[/tex]²⁻(aq)
In this reaction, solid silver carbonate dissociates into silver ions ([tex]Ag[/tex]⁺) and carbonate ions ([tex]CO_{3}[/tex]²⁻) in the aqueous solution.
2. Dissociation of [tex]H_{2}CO_{3}[/tex](carbonic acid):
[tex]H_{2}CO_{3}[/tex](aq) ⇌ [tex]H[/tex]⁺(aq) + [tex]HCO_{3}[/tex]⁻(aq)
Carbonic acid, when dissolved in water, forms hydrogen ions ([tex]H[/tex]⁺) and bicarbonate ions ([tex]HCO_{3}[/tex]⁻).
3. Dissociation of [tex]HCO_{3}[/tex]⁻ (bicarbonate ion):
[tex]HCO_{3}[/tex]⁻(aq) ⇌[tex]H[/tex]⁺(aq) + [tex]CO_{3}[/tex]²⁻(aq)
The bicarbonate ion further dissociates into hydrogen ions (H⁺) and carbonate ions (CO₃²⁻).
4. Dissociation of [tex]H_{2}O[/tex](water):
[tex]2H_{2}O[/tex](l) ⇌ [tex]H_{3}O[/tex]⁺(aq) + [tex]OH[/tex]⁻(aq)
Water undergoes self-ionization to form hydronium ions ([tex]H_{3}O[/tex]⁺) and hydroxide ions ([tex]OH[/tex]⁻).
These equilibrium reactions describe the dissociation processes occurring in an aqueous solution of silver carbonate.
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Starting with a 7. 0 x 10-5 M. Allura Red stock solution you will need to calculate the volumes required to prepare 10.00 mL solutions of 3.5 x 10-5 M, 2.8 x 10-5 M, 2.1 x 10-5 M, 1.4 x 10-5 M, and 3.5 x 10-6 M before coming to lab. What volume of the stock solution will be required to prepare 10.00 mL of a 2.1 x 10-5 M solution of Allura Red?
Answer:
1) 5.0 mL, 4.0 mL, 3.0 mL and 2.0 mL respectively.
2) 3.0 mL
Explanation:
Hello there!
1) In this case, by considering that the equation we use for dilutions contain the initial and final concentrations and volumes:
[tex]C_1V_1=C_2V_2[/tex]
For the first four solutions, we compute the volume of the stock one (V1) as shown below:
[tex]V_1=\frac{C_2V_2}{C_1}[/tex]
Thus, we obtain:
[tex]V_1^1=\frac{3.5x10^{-5}M*10.00mL}{7.0x10^{-5}M} =5.0mL\\\\V_1^2=\frac{2.8x10^{-5}M*10.00mL}{7.0x10^{-5}M} =4.0mL\\\\V_1^3=\frac{2.1x10^{-5}M*10.00mL}{7.0x10^{-5}M} =3.0mL\\\\V_1^4=\frac{1.4x10^{-5}M*10.00mL}{7.0x10^{-5}M} =2.0mL[/tex]
2) In this case, for a final concentration of 2.1x10-5 M and a volume of 10.00 mL, the volume of the stock solution would be:
[tex]V_1=\frac{2.1x10^{-5}M*10.00mL}{7.0x10^{-5}M} =3.0mL[/tex]
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A 6.50 gram piece of aluminum reacts with an excess of oxygen. use the balanced equation below to determine how many grams of aluminum oxide is formed during this reaction.
4 Al + 3 O2 --> 2 Al2O3
a. 662.7 grams of Al2O3
b. 6.1 grams of Al2O3
c. 24.6 grams of Al2O3
d. 12..3 grams of Al2O3
Answer:
d. 12.3 grams of Al2O3
Explanation:
The balanced equation in this question is as follows:
4Al + 3O2 → 2Al2O3
In this equation above, 4 moles of Al produces 2 moles of Al2O3
However, the moles of Al2O3 must first be found using;
mole = mass/molar mass
Molar mass of Al = 27g/mol
mole = 6.50/27
= 0.241mol of Al.
Hence, if 4 moles of aluminum (limiting reagent) reacts to form 2 moles of aluminum oxide (Al2O3).
Then, 0.241mol of Al will produce (0.241 × 2/4) = 0.241/2 = 0.121mol of Al2O3.
Convert this mole value to molar mass using mole = mass/molar mass
Molar mass of Al2O3 = 27(2) + 16(3)
= 54 + 48
= 102g/mol
mass = molar mass × mole
mass = 102 × 0.121
mass of Al2O3 = 12.34grams.
CH3 CH3 CH3-CH2-CH=CH-CH-CH-C-CH-CH3 CH3 COMO SE LLAMA?
A 0. 821 gram sample of pure NH F was treated with 25. 0 mL of 1. 00 M NaOH
and heated to drive off the NH3. How many milliliters of 0. 500 M HCl are needed for the back titration?
To complete the back titration of NH4F, a quantity of 50.0 mL of 0.500 M HCl is required.
The given chemical equation for the reaction between NH4F and NaOH is as follows: NH4F + NaOH → NaF + NH3 + H2OThe reaction between NH3 and HCl can be written as follows:NH3 + HCl → NH4ClTherefore, the total reaction can be written as follows:NH4F + NaOH + HCl → NaCl + NH4Cl + H2O
The amount of NaOH needed to react with NH4F is calculated as follows:
n = C × Vn = 1.00 M × 0.0250 Ln = 0.025 mol
The amount of NH3 generated is equal to the amount of NH4F that reacted, assuming that NH3 is fully driven off. The amount of HCl that reacts with NH3 can be calculated using the following equation:
n = C × Vn
= 0.025 molC
= n / VC = 0.025 mol / 0.500 MC
= 0.0500 LTherefore, 50.0 mL of 0.500 M HCl is needed for the back titration
To complete the back titration of NH4F, a quantity of 50.0 mL of 0.500 M HCl is required.
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Anita made a frozen treat to eat on a hot day by pouring juice into an ice cube tray and putting the tray in the freezer. When she took it out of the freezer a few hours later, the juice was frozen. Select the phrases from the drop-down lists to correctly complete the sentences. When Anita took the tray out of the freezer, the frozen juice was made of 1. A. the same substance as before because the types of atoms 2. D. stayed the same . A 3. F. physical change occurred.
Answer:
physical change occured
Explanation:
it is still juice
At a certain temperature, the pH of a neutral solution is 7.82. What is the value of Kw at that temperature?
Express your answer numerically using two significant figures
Kw=
The value of Kw at that temperature is approximately 0.00020. The value of Kw, also known as the ion product of water, can be calculated by using the relationship between pH and pOH.
The pH scale is a logarithmic scale that measures the concentration of hydrogen ions (H+) in a solution. A neutral solution has equal concentrations of H+ and hydroxide ions (OH-). The sum of the pH and pOH values in a neutral solution is always 14. Therefore, if the pH of a neutral solution is 7.82, the pOH can be calculated by subtracting the pH from 14: pOH = 14 - pH = 14 - 7.82 = 6.18 . Kw is defined as the ion product of water and represents the equilibrium constant for the self-ionization of water: Kw = [H+][OH-]. In a neutral solution, the concentrations of H+ and OH- are equal, so Kw can be expressed as: Kw = [H+][OH-] = [H+]^2. Since the solution is neutral, the concentration of H+ (and OH-) is equal. Therefore: [H+] = [OH-] = sqrt(Kw). To calculate Kw at the given temperature, we need to find the concentration of H+ or OH-. We can use the pOH value we calculated earlier: [H+] = 10^(-pOH) = 10^(-6.18) ≈ 0.014. Now, we can find Kw by squaring the concentration of H+: Kw = [H+]^2 = (0.014)^2 ≈ 0.000196
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