A solution has [OH-] = 2.4 Ã10-7 M. The[H+] in this solution isa. 1.0 Mb. 2.4x10^7Mc.1x10^-7Md. 4.2x10^-4Me. none of these
Answers
The [H⁺] in the solution having [OH-] = 2.4 x 10-7 M is 4.2 x 10⁻⁸ M. Hence, the correct answer is (e) none of these.
To find the [H⁺] concentration in the solution with [OH⁻] = 2.4 x 10⁻⁷ M, we will use the ion product of water (Kw) and the relationship between [H⁺] and [OH⁻] concentrations. The ion product of water (Kw) is 1.0 x 10⁻¹⁴ at 25°C. The relationship between [H⁺] and [OH⁻] is given by:
Kw = [H⁺] x [OH⁻]
We know the [OH⁻] concentration and Kw, so we can solve for [H⁺]:
1.0 x 10⁻¹⁴ = [H⁺] x (2.4 x 10⁻⁷)
To find [H⁺], divide both sides by 2.4 x 10⁻⁷:
[H⁺] = (1.0 x 10⁻¹⁴) / (2.4 x 10⁻⁷)
[H⁺] = 4.17 x 10⁻⁸ M (approximately)
The closest answer choice to the calculated [H⁺] concentration is 4.2 x 10⁻⁸ M, which is not listed among the given options. Therefore, the correct answer is (e) none of these.
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Related Questions
Axel BM2 2021 (2019 STAAR Released Science, Grade 8) COLOR THEME CALCULATOR QQ ZOOM REFERENCE + ADD NOTE QUESTION GUIDE DIRECTIONS O Conifer trees and tall grasses with roots that loosen the soil Read each question carefully. For a multiple-choice question, determine the best answer to the question from the four answer choices provided. For a griddable question, determine the best answer to the question. Then fill in the answer on your answer document. O Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil Mosses and lichens that can grow on rocky surfaces O Vines and shrubs that help prevent the erosion of shallow soil Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species? CLEAR ALL < PREVIOUS 01 O O 3 04 O 5 06 07 8 09 O 10 NEXT > REVIEV e 3 DLL
Answers
a prominent peak at m-18 is seen in the mass spectrum of a compound containing c, h, and o. what functional group is associated with this signal?
Answers
The correct option is C, Alcohol is the functional group that is most likely associated with the signal at m-18.
A functional group is a specific group of atoms that determines the chemical and physical properties of a compound. It is the reactive part of a molecule that defines its chemical behavior. A functional group is a group of atoms that are covalently bonded to the rest of the molecule, and their presence gives the molecule its characteristic properties.
Functional groups can be classified into various categories, such as hydrocarbons, alcohols, carboxylic acids, amines, and ethers. Each functional group has its own distinctive set of chemical properties and reactivity. For example, the presence of a carbonyl group in a molecule gives it the ability to undergo nucleophilic addition reactions.
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Complete Question:
A prominent peak at m-18 is seen in the mass spectrum of a compound containing c, h, and o. What functional group is associated with this signal?
A). Ketone
B). Ether
C). Alcohol
D). Phenol
In the Freezing Point Depression experiment, you will calculate the colligative molality of the solutions you produce, the freezing point depression, and the predicted boiling point of the resulting solutions. This question will give you practice doing this before you come to lab. In an experiment, you use 8.800 g of solvent (FP = 86.6°C; Kf = 5.3°C/m) and 0.700 g of solute (molecular mass = 218.09 g/mol).
Required:
a. How many moles of solute have you used?
b. What is the colligative molality of the solution formed?
Answers
molecular mass of the solute, and mass of the solvent, we calculated the number of moles of solute used (0.0032 mol) and the colligative molality of the solution formed (approximately 0.364 mol/kg)
a. The number of moles of solute can be calculated using the formula:
solute moles = solute mass / solute molar mass
Given that the mass of the solute is 0.700 g and the molar mass is 218.09 g/mol, we can substitute these values into the formula:
moles of solute = 0.700 g / 218.09 g/mol ≈ 0.0032 mol
Therefore, you have used approximately 0.0032 moles of solute.
b. The colligative molality of the solution can be calculated using the formula:
molality = solute moles / solvent mass
To convert the mass of the solvent from grams to kilograms, divide by 1000:
mass of solvent = 8.800 g / 1000 = 0.0088 kg
Substituting the values into the formula:
molality = 0.0032 mol / 0.0088 kg ≈ 0.364 mol/kg
Therefore, the colligative molality of the solution formed is approximately 0.364 mol/kg.
By using the given information about the mass of the solute, molecular mass of the solute, and mass of the solvent, we calculated the number of moles of solute used (0.0032 mol) and the colligative molality of the solution formed (approximately 0.364 mol/kg). These calculations are important in understanding the effect of solute concentration on colligative properties such as freezing point depression and boiling point elevation.
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If the heat of combustion for a specific compound is −1160.0 kJ/mol and its molar mass is 86.47 g/mol, how many grams of this compound must you burn to release 541.20 kJ of heat?
Answers
Answer:
40.34 g
Explanation:
First, we divide the heat to release by the heat of combustion to obtain the required moles of compound:
541.20 kJ/(1160.00 kJ/mol) = 0.4665 mol
So, we have to burn approximately 0.47 mol of the compound. We convert the moles to mass in grams by using the molar mass:
mass = molar mass x moles = 86.47 g/mol x 0.4665 mol = 40.34 g
Therefore, you must burn 40.34 grams of the compound to release 541.20 kJ of heat.
what are three applications of the
coal
Answers
Three uses of coal:
1. Electricity generation
2. Steel production
3. Cement manufacturing and as a liquid fuel
Hope it helps!
how many electrons does hydrogen need in order to have a full shell of valence electrons?
Answers
Answer:
One
Explanation:
In a hydrogen atom, the first outer shell only consists of two valence electrons, because it would already have one, the atom only needs one more.
It requires two electrons to completely occupy its outer shell, it frequently forms a single covalent bond with another atom. Because of this configuration, hydrogen can gain access to two electrons and completely occupy its valence shell.
What is Hydrogen?Hydrogen adheres to the duet rule because it only requires two electrons to completely occupy its valence shell. It deviates from the octet rule. Hydrogen only needs to form one bond. Because of this, H is always a terminal atom and never a central atom. Hydrogen is a chemical element with the symbol H and the atomic number 1.Hydrogen is the lightest element. Under normal conditions, hydrogen is a gas of diatomic molecules with the formula H2. It is colorless, odourless, tasteless, non-toxic, and extremely flammable. Hydrogen is a more environmentally friendly alternative to methane, also known as natural gas. It is the most abundant chemical element, accounting for 75% of the universe's mass. Water, plants, animals, and, of course, humans contain massive amounts of hydrogen atoms.To learn more about valence electron refer to:
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What are the limiting reagent and theoretical yield in grams
of iron metal (55.845
g/mol) when 297 grams of aluminum powder (26.981538 g/mol) is
reacted with 416 grams of iron (IlI) oxide (159.69 g/mo
Answers
Fe₂O₃ is the limiting reagent and Al is in excess. The mass of iron produced is 64.20 g.
The balanced chemical equation for the reaction between aluminum and iron(III) oxide is:
2Al + Fe₂O₃ → 2Fe + Al₂O₃
Using the molar masses of aluminum (Al) and iron(III) oxide (Fe₂O₃), we can calculate the number of moles of each reactant:
moles of Al = mass ÷ molar mass = 21.4 g ÷ 26.98 g/mol = 0.793 mol
moles of Fe₂O₃ = mass ÷ molar mass = 91.3 g ÷ 159.69 g/mol = 0.572 mol
According to the balanced equation, 2 moles of Al react with 1 mole of Fe₂O₃. Therefore, the stoichiometric ratio of Al to Fe₂O₃ is 2:1. However, we have more moles of Al than what is required for the reaction with the available amount of Fe₂O₃. Hence, Fe₂O₃ is the limiting reagent and Al is in excess.
moles of Al needed = 0.5 × moles of Fe₂O₃ = 0.5 × 0.572 mol = 0.286 mol
The amount of excess Al is the difference between the actual amount of Al used and the theoretical amount needed:
moles of excess Al = moles of Al used - moles of Al needed
= 0.793 mol - 0.286 mol
= 0.507 mol
The mass of excess Al can be calculated using its molar mass:
mass of excess Al = moles of excess Al × molar mass of Al
= 0.507 mol × 26.98 g/mol
= 13.68 g
Therefore, the mass of excess Al left over is 13.68 g.
To determine the amount of iron produced, we can use the stoichiometric ratio of Fe₂O₃ to Fe in the balanced equation:
1 mole of Fe₂O₃ produces 2 moles of Fe
moles of Fe = 2 × moles of Fe₂O₃
= 2 × 0.572 mol
= 1.144 mol
The mass of iron produced can be calculated using its molar mass:
mass of Fe = moles of Fe × molar mass of Fe
= 1.144 mol × 55.85 g/mol
= 64.20 g
Therefore, the mass of iron produced is 64.20 g.
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The complete question should be
Aluminum reacts with iron(III) oxide to produce iron and aluminum oxide. If 21.4 grams of aluminum is reacted with 91.3 grams of iron(III) oxide. Identify the limiting reagent and the excess? how many grams of the excess is left over. How many grams of iron are produced ?
6. one ml of 1 m naoh was added to 9999 ml of water. what is the final naoh concentration? what is the ph??
Answers
The final concentration, C₂ of the aqueous NaOH solution is 0.001 M or 1.0 * 10⁻³
The pH change is 3.
What is the volume of the final concentration of the NaOH solution?The volume of the final concentration of the NaOH solution is determined as follows;
The initial volume = 1.0 mL
The final volume = 999 mL + 1 mL
The final volume = 1000 mL
The initial concentration of the NaOH solution = 1 M
The final concentration is calculated using the dilution formula as follows:
C₁V₁ = C₂V₂
where:
C₁ is the initial concentration
V₁ is the initial volume
C₂ is the final concentration
V₂ is the final volume
C₂ = 1 * 1/1000
C₂ = 0.001 M or 1.0 * 10⁻³
The pH change = -log(10⁻³)
The pH change = 3
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Which commercial technology commonly uses plasmas?
a radio
a race car
a television
a microwave oven
Answers
The correct answer is C. A television
Explanation:
Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.
Answer:
c
Explanation:
edge
How many moles are in 3.59 x 10^10 kg of gallium ?
Answers
if i’m wrong someone correct me please
PLZ HELP ME WITH MY WORK
Answers
pls mark me as the brainliest :)
Answer:High density
Explanation:
The metal doesn't remains gas at room tempreture, it doesn't have brittleness property and it is not poor conductor of electricity .But, it has high density .
Hope, it would be correct.
Can somebody plz help answer all these true and false questions CORRECT!!
WILL MARK BRAINLIEST :D
Answers
Answer:
1-T
2-F
3-T
4-T
Explanation:
big brain
how long was all the matter in the universe theorized to be compressed into a minuscule scalding mass?
Answers
Answer:
10⁻³⁶ s
Explanation:
There is much speculation, but many scientists believe the universe started expanding about 10⁻³⁶ s after the Big Bang.
If 0.08 moles of Fe are
reacted, how many moles of
H, are formed?
Answers
Based on the balanced equation, if we have 0.08 moles of Iron (Fe), we can conclude that 0.08 moles of Hydrogen (H₂) will be formed as well.
How to Calculate Mole in a Chemical EquationFirst we need to balance the chemical equation for the reaction involving Iron (Fe) and Hydrogen (H).
The reaction will be between Fe and HCl (hydrochloric acid) to produce hydrogen gas (H₂) and iron chloride (FeCl₂):
Fe + 2HCl → FeCl₂ + H₂
From the balanced equation, we can see that for every 1 mole of Fe reacted, 1 mole of H₂ is formed. Therefore, if we have 0.08 moles of Fe, we can conclude that 0.08 moles of H₂ will be formed as well.
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Write balanced equations for each of the following by inserting the correct coefficients in the blanks:
(c) __B₂O₃(s) + __NaOH(aq) → __Na₃BO₃(aq) + __H₂O(l)
Answers
Balanced equation :
B₂O₃(s) + 2NaOH(aq) → Na₃BO₃(aq) + 2H₂O(l)
What is the balance formula equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction
What is a full balanced equation?
The global balance equations (also known as full balance equations) are a set of equations that characterize the equilibrium distribution (or any stationary distribution) of a Markov chain, when such a distribution exists.
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Calculate the number of moles in 7.04 g of lead (II) nitrate, Pb(NO3)2
Can Someone help me covert this?!
Answers
Answer:
moles Pb(NO₃)₂ ≅ 0.0213 mole (three sig. figs.)
Explanation:
converting...
grams to moles => divide by formula weight
moles to grams => multiply by formula weight
for this problem ...
moles Pb(NO₃)₂ = 7.04g / 331.2g/mol = 0.021256 (calculator answer)
≅ 0.0213 mole (three sig. figs.)
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the number of moles in 7.04 g of lead (II) nitrate, Pb(NO₃)₂ is 0.0212moles.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
Molar mass of 1 mole of Pb(NO₃)₂ = 331.2g/mol
given mass of Pb(NO₃)₂=7.04g
Substituting the values in above formula we get
moles of Pb(NO₃)₂ = 7.04g / 331.2g/mol
moles of Pb(NO₃)₂ = 0.0212moles
Therefore, the number of moles in 7.04 g of lead (II) nitrate, Pb(NO₃)₂ is 0.0212moles.
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in the treatment with radioactive phosphorus, 35p was found in the pellet of cellular debris at the bottom of the test tube. and in the treatment with radioactive sulfur, 32s was found only in the supernatand and not the debris pellet. how would you interpret this?
Answers
The phosphorus had a higher affinity for the cells than the sulfur.
What is phosphorus?Phosphorus is a chemical element that has the symbol P and atomic number 15. It is a nonmetallic, multivalent, and highly reactive element that is an essential component of life. Phosphorus is found in many fertilizers and is an important component of DNA and RNA. In plants, phosphorus helps with energy production, root growth, and seed production. In animals, phosphorus helps with growth and development, muscle contraction and nerve impulse transmission, and cellular communication.
This suggests that the radioactive phosphorus was taken up by the cells and incorporated into their structure, while the radioactive sulfur was not able to be taken up by the cells and remained in the supernatant. Therefore, the phosphorus had a higher affinity for the cells than the sulfur.
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A quantity of N2O4 is introduced into a flask at an initial pressure of 2 atm at temp T. After the N2O4 has decomposed to NO2 and has come to equilibrium, the pressure of N2O4 is 1.8 atm. Calculate the value of Kp for the process.
Answers
When a quantity of N₂O₄ is introduced into a flask at an initial pressure of 2 atm at temp T and after that the N₂O₄ has decomposed to NO₂ and has come to equilibrium, the pressure of N₂O₄ is 1.8 atm. The value of Kp for the process is 0.0889.
For the given reaction equation can be written as
N₂O₄(g) 2NO₂(g)
Initial(atm) 2 0
Change(atm) -x +2x
Equilibrium(atm) 2-x 2x
Given that
2-x = 1.8 atm
x= 0.2 atm
∴ Pressure of NO₂(g) at equilibrium = 2x
= 0.4 atm
Kp = P(NO₂(g))² /P( N₂O₄(g))
=(0.4)²/1.8 = 0.0889
Hence, the value of Kp is 0.0889.
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which is a characteristic of the part of the atom marked A
Answers
Answer:
Please upload the picture and I can answer
Explanation:
Answering: it is mostly empty space
Explanation:
When solid ammonium chloride is added to water, all of the solid dissolves and the solution becomes cold.
a. True
b. False
Answers
True. When solid ammonium chloride is put to water, it dissolves quickly and undergoes an endothermic reaction, meaning that heat from the environment is absorbed, cooling the solution.
A salt with no flavour or scent, ammonium chloride has a number of uses. It is frequently used in fertilisers, as an animal feed addition, and in several medical procedures. Ammonium chloride, often known as NH4Cl, is a chemical compound made up of ammonium ions (NH4+) and chloride ions (Cl-). Water rapidly dissolves ammonium chloride when it is introduced, releasing ammonium and chloride ions into the solution. Because of the endothermic nature of this process, the solution cools down as a result of heat being absorbed from the surroundings. This quality is frequently applied in cooling applications, such as cold packs.
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How much heat is required to change 48.5 liquid mercury (Hg) at 400 K to vapor at a 700 K? The boiling point of mercury is 629.88 K
-88 kj
-204 kj
16.2 kj
30 kj
29 kj
Answers
Answer: 4.91 kJ
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
\(Q=m\times c_l\times (T_(f,l)-T_(i,l))+m\imes L+m\times c_v\times T_(f,v)-T_(i,v)\)
Q = Heat absorbed = ?
m= mass of mercury = 48.5 g = 0.0485 kg
c = specific heat capacity = \(0.14kJ/kgK\)
L = heat of vaporization = 59.2 kJ
Initial temperature of liquid mercury = \(T_i\) = 400 K
Final temperature of mercury vapor = \(T_f\) = 700 K
Putting in the values, we get:
\(Q=0.0485\times 0.14\times (629.88-400)+0.0485\times 59.2+0.0485\times 0.14\times (700-629.88)\)
\(Q=1.56+2.87+0.476\)
\(Q=4.91kJ\)
Answer:
16.2 kj
Explanation:
1.56kj + 14.31kj + 0.34kj
What is the formula for an ionic compound that is composed of potassium and oxygen?
Answers
Answer:
Ty for free points :)
Explanation:
HELP MEEEEEEEEEEEE
Winds and ocean breezes occur due to _____________.
A. None of these
B. Conduction currents
C. Boiling
D. Convection currents
Answers
Answer:
B
Explanation:
it flows by the conduction currents
what type of reaction takes place between methane and chlorine
Answers
Answer and Explanation:
When methane (CH4) and chlorine (Cl2) react, a substitution reaction takes place. Specifically, the reaction is a halogenation reaction, in which one or more hydrogen atoms in the methane molecule are replaced by chlorine atoms. The reaction can be represented by the following equation:
CH4 + Cl2 → CH3Cl + HCl
In this equation, CH3Cl represents chloromethane, which is a type of organochlorine compound. The reaction is typically initiated by ultraviolet (UV) light or heat, and it proceeds through a series of free radical chain reactions. The products of the reaction are typically a mixture of chloromethane and hydrogen chloride (HCl) gas.
Why was the Copernicus discovery called the Copernican revolution A. It caused a big fight in the scientific community B. It confused scientists about which planetary body revolved around the other C. It represented a change in scientific thought. D. It proved the science could never be trusted.
Answers
The answer you’re looking for is C.
It represented a change in scientific thought.
The answer is C.
Why was Copernicus's discovery called Copernican Revolution?
The "Copernican Revolution" is named for Nicolaus Copernicus, whose Commentariolus, written before 1514, was the first explicit presentation of the heliocentric model in Renaissance scholarship.
What was important about the Copernican revolution?The Copernican Revolution gives us an important framework for understanding the Universe. We do not occupy a special or privileged place in the Universe. The Universe and everything in it can be understood and predicted using a set of basic physical laws (“rules”).
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the nucleus or center area of the atom contains two kinds of subatomic particles. which two?
Answers
Select all the statements that correctly describe the role of valence electrons in chemical reactivity.A. Valence electrons are the electrons that participate in chemical reactions because they are the farthest from the nucleus.
B. The number of valence electrons lost or gained to adopt a noble gas configuration governs what ions are formed by main-group elements.
C. Filled valence s and p sublevels give exceptional stability to any atom or ion.
Answers
A and B are both correct statements about the role of valence electrons in chemical reactivity. C is not correct - while filled valence sublevels do provide some stability, they do not necessarily give "exceptional stability" and are not always required for an atom or ion to be stable.
the role of valence electrons in chemical reactivity using the terms you've provided:
A. Valence electrons are indeed the electrons that participate in chemical reactions, as they are the farthest from the nucleus and thus more easily involved in bonding.
B. The number of valence electrons lost or gained to achieve a noble gas configuration determines the ions formed by main-group elements, which typically strive for stability.
C. Filled valence s and p sublevels do provide exceptional stability to atoms or ions, as they achieve a stable electron configuration similar to noble gases.
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How many grams are there in 7.9 X 10^23 molecules of AgNO3?
Answers
Answer:$$7.50 x 10^23$$
$$H_2SO_4$$?
Explanation:It is a fact that such a quantity has a mass of
98.08
⋅
g
. Why? Because
6.022
×
10
23
particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of
98.08
⋅
g
...
Question 4
Classify the following reaction: 2HCI+Mg-->H₂+MgCl₂
O synthesis
O single replacement
O decomposition
O double replacement
Answers
One displacement reaction is the answer. Single displacement reactions occur when an element in one compound is changed in another. Metal magnesium reacts in the reaction described.
How is magnesium metal reacted?This powdery substance is created when magnesium delivers 2 electrons to oxygen atoms. The reaction here is exothermic. Chemical reactions that release energy on a net basis are referred to as exothermic reactions.
What occurs when magnesium is in contact with water?When magnesium and water mix, hydrogen is created along with a large amount of heat. Metallic magnesium responds rather slowly, but mag vapour, which is created when magnesium burns, reacts very quickly because of the elevated temp and effective mixing, and it swiftly generates heat. Water is added to burning magnesium, which causes an explosion.
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its gelatin and a fruit cup the same (its for a project)
Answers
Answer:
No
Explanation:
Gelatin is a substance that makes jello, and a fruit cup is a cup full of fruit
Answer:
no
Explanation: