Answer:
[tex][H^+]=[OH^-]=1.0x10^{-7}M[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the relative concentrations by using the following equations:
[tex]pH+pOH=14\\\\pH=-log([H^+])\\\\pOH=-log([OH^-])[/tex]
Thus, we realize that both pH and pOH are the same, 7, so that the concentration of H⁺ and OH⁻ are virtually the same, and can be calculated as follows:
[tex][H^+]=[OH^-]=10^{-7}=1.0x10^{-7}M[/tex]
Regards!
What is the molar solubility of MgF2 in a 0.36 M Mg(NO3)2 solution? For MgF2, Ksp = 8.4 × 10^–8
Answer:
2.4 × 10⁻⁴ M
Explanation:
Step 1: Calculate the concentration of Mg²⁺ coming from Mg(NO₃)₂
Mg(NO₃)₂ is a strong electrolyte and the molar ratio of Mg(NO₃)₂ to Mg²⁺ is 1:1. The initial molar concentration of Mg²⁺ is 1/1 × 0.36 M = 0.36 M.
Step 2: Make an ICE chart for the solution of MgF₂
MgF₂(s) ⇄ Mg²⁺(aq) + 2 F⁻(aq)
I 0.36 0
C +S +2S
E 0.36+S 2S
The solubility product constant is:
Ksp = [Mg²⁺] × [F⁻]² = (0.36+S) × (2S)²
Since S <<< 0.36, 0.36+S ≈ 0.36.
Ksp = 0.36 × 4S² = 8.4 × 10⁻⁸
S = 2.4 × 10⁻⁴ M
2.31 grams of KNO3 are dissolved in 4.15 g of H2O. What is the concentration of the solution in units of gKNO3/100gH2O?
Answer: The concentration of the solution is 55.66g[tex]KNO_3[/tex]/100g[tex]H_2O[/tex]
Explanation:
A solution consists of solute and solvent. A solute is defined as the component present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.
We are given:
Mass of [tex]KNO_3[/tex] = 2.31 g
Mass of water = 4.15 g
To calculate the concentration in g[tex]KNO_3[/tex]/100 g [tex]H_2O[/tex], we apply unitary method:
In 4.15 g of water, the mass of [tex]KNO_3[/tex] present is 2.31 g
So, in 100 g of water, the mass of [tex]KNO_3[/tex] present will be [tex]\frac{2.31}{4.15}\times 100=55.66g[/tex]
Hence, the concentration of the solution is 55.66g[tex]KNO_3[/tex]/100g[tex]H_2O[/tex]
What law allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed?
Answer:
matter i think
Explanation:
matter i am pretty sure
The law that allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed is first law of thermodynamics.
What is first law of thermodynamics?Energy cannot be generated or destroyed, only changed in form, according to the basic law of thermodynamics.
Energy transfer occurs when mass crosses the control boundary, external work is performed, or heat is transferred across the boundary in any system. These cause the stored energy in the control volume to shift.Hence first law of thermodynamics justify the given statement.
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X is a second period element belonging to Group 7A. Which of the following choices corresponds to the largest predicted bond dissociation energy?
A) X2.
B) X-.
C) X 2+.
D) X+.
E) X22-.
+
c)
FeCl3 +
NH4OH
Fe(OH)3
NHACI
The question is incomplete, the complete question is:
Write the net ionic equation for the below chemical reaction:
(c): [tex]FeCl_3+3NH_4OH\rightarrow Fe(OH)_3+3NH_4CI[/tex]
Answer: The net ionic equation is [tex]Fe^{3+}(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)[/tex]
Explanation:
Net ionic equation is defined as the equations in which spectator ions are not included.
Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.
(c):
The balanced molecular equation is:
[tex]FeCl_3(aq)+3NH_4OH(aq)\rightarrow Fe(OH)_3(s)+3NH_4Cl(aq)[/tex]
The complete ionic equation follows:
[tex]Fe^{3+}(aq)+3Cl^-(aq)+3NH_4^+(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)+3NH_4^+(aq)+3Cl^-(aq)[/tex]
As ammonium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]Fe^{3+}(aq)+3OH^{-}(aq)\rightarrow Fe(OH)_3(s)[/tex]
A can contains 375mL of soda. Using the appropriate number of significant figures, how much soda is left in the can after 308mL is poured into a glass
Answer:
[tex]V_l=67mL[/tex]
Explanation:
From the question we are told that:
Initial Volume [tex]V_1=375mL[/tex]
Final Volume [tex]V_2=308mL[/tex]
Generally the equation for Left-Over is mathematically given by
[tex]V_l=V_1-V_2[/tex]
[tex]V_l=375-308[/tex]
[tex]V_l=67mL[/tex]
Which of the following mixtures is best separated by the use of a separating funnel?
methane and water
ethyl ethanoate and water
ethanol and water
ethanoic acid and water
Answer:
ethyl ethanoate and water
Explanation:
At the point when one fluid doesn't blend in with another yet glides on top of it, an isolating pipe can be utilized to isolate the two fluids. Oil glides on water. This combination can be isolated utilizing an isolating channel as demonstrated on the following page.
Ethyl liquor and water are two miscible fluids. Refining is a cycle that can be utilized to isolate an unadulterated fluid from a combination of fluids. An isolating channel can be utilized to isolate the parts of the combination of immiscible fluids.
The answer is ethyl ethanoate and water. Hope this helps you!
Which chemical equation represents a process that takes place in yeast cells? O A. CO2 + H20 + light energy - O2 + sugar O B. O2 + sugar CO2 + H2O + ATP energy C. 02 + sugar CO2 + H2O + light energy O D. CO2 + H20 + ATP energy - 02 + sugar SUBMIT
Answer:
A
Explanation:
In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol . This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.
[tex]CO_2 + H_20[/tex]+ light energy → [tex]O_2[/tex] + sugar chemical equation represents a process that takes place in yeast cells. Hence, option A is correct.
What are chemical equations?A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.
In plant and yeast cells pyruvate is converted into carbon dioxide and a type of alcohol called ethanol. This process is called fermentation and yields only two molecules of ATP per glucose molecule broken down.
Hence, option A is correct.
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an ion has 38 protons, 36 electrons, qnd 40 neutrons, what is its mass #?
Answer:
Strontium - 38 (atomic #)
Explanation:
An ion with 38 protons, 36 electrons, and 40 electrons is Strontium. Strontium's atomic number is 38.
The earth's crust is:
made of rock
the thinnest layer
broken into large pieces called plates
all of the above
Answer:
all of the above
Explanation:
have a nice day :-)
PLEASE HELP ASAP FOR 25 POINTS!! :D
6 Identify) What particle increases in number when a base is dissolved in water?
A: OH–
B: H3O+
C: H2O
D: H'
the x y axis is tipped so the earth is flat
Homologous chromosomes pair up during prophase I to form a ________________.
Fill it in PLSSSSSSSSSSSSS
i will give brainlist
What is the main concern for environmental scientists?
Answer:
Global Warming
Explanation:
The biggest concern for environmental scientists is Global Warming. Our Earth is getting warmer which is having drastic effects on our planet. Such effects include increased natural fires, decreased water supply, decreased farm yields, increased floodings, etc. Global Warming poses a huge threat to humanity and it is because of humanity's constant and ever growing usage of fossil fuels that Global Warming is becoming such a threat. This is what environmental scientists are mainly focused on.
When HCl(g) reacts with NH3(g) to form NH4Cl(s), 42.1 kcal of energy are evolved for each mole of HCl(g) that reacts. Write a balanced equation for the reaction with an energy term in kcal as part of the equation.
Answer: The chemical equation is [tex]HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal[/tex]
Explanation:
There are 2 types of reactions that are classified based on enthalpy change:
Endothermic reactionExothermic reactionEndothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.
Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.
Given values:
Energy released for 1 mole of HCl reacted = -42.1 kCal
The chemical equation for the formation of ammonium chloride follows:
[tex]HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal[/tex]
Lee y analiza a detalle el Anexo #1 de este plan de trabajo el cual habla sobre las fuentes alternativas de energía. Posteriormente con la información elabora un cartel o un cuadro sinóptico en tu cuaderno donde organices la información para darla a conocer a los miembros de tu comunidad.
Answer: el texto no es tan claro
Según la cinética química para que una reacción ocurra, los átomos o moléculas deben
I. Chocar con la suficiente energía. II. Chocar con una concentración adecuada. III. Ser choques efectivos
A) Solo I.
B) Solo I y II.
C) Solo I y III.
D) Solo II y III.
E) I, II, III.
Answer:
solo I
Explanation:
Según esta teoría para que se produzca una reacción deben cumplirse tres condiciones: Las moléculas de los reactivos tienen que chocar entre sí. Estos choques deben de producirse con energía suficiente de forma que se puedan romper y formar enlaces químicos.
pasagot plizzz kung sino makasagot ng tamang sagot ibebrainliest ko
Answer:
1. B
2.B
3.B
4.C
5.C
Explanation:
I hope this help you
the beaker contains 0.2556 m h2so3 and the buret contains 0.3106 m naoh what happens to the conductivity during titration
Answer:
Before the equivalence point, conductivity is decreasing. After the equivalence point, conductivity is increasing
Explanation:
In solution H2SO3 produce H+ ions and SO3²⁻ ions. In the same way, NaOH produce Na⁺ and OH⁻ ions. The conductivity of a solution is directly proportional to the concentration of ions in a solution. During titration, you are adding more NaOH (That is, more Na⁺ and OH⁻ ions). But each moles of OH⁻ reacts with H⁺ ion producing H₂O. That means the moles of Na⁺ that you are adding = Moles of H⁺ are been consumed. The concentration of ions remains approximately constant. But, H⁺ ion conducts better than Na⁺ ion. That means before the equivalence point, conductivity is decreasing. But after the equivalence point you will add OH- ions in excess increasing ion concentration increasing the conductivity:
After equivalence point, conductivity is increasing.
Guys I don't know science, if you are intelligent tell me what is science
Explanation:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence
the most correct definition of a chemical bond is the:
what is most likely to happen during a precipitation reaction
A substance will react with oxygen to form water and carbon. ... dioxide.
Answer:
it will rain and there the other defined for precipitation snow and sleet and hail
At what temperatures is a reaction that has a positive change in entropy
spontaneous?
A. At all temperatures for exothermic reactions
B. At lower temperatures for endothermic reactions
C. At all temperatures for endothermic reactions
D. At no temperatures for exothermic reactions
Answer:
the answer is A
I made a chart for AP chem if you want to refer to it.
The reaction that has a positive change in entropy
spontaneous will be " At all temperatures for exothermic reactions".
What is spontaneous?A spontaneous reaction is one where the production of products is favored under the conditions of the reaction.
What is exothermic reactions?A reaction wherein energy will be emitted in the term of light as well as heat has been known as that of an exothermic reaction.
The free energy change will always be negative and even the reaction has always been spontaneous if such reaction was exothermic (H equals negative) as well as the entropy S was positive.
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Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
Answer:
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option observations conclusions reaction ΔΗ is (pick one) The reverse of this reaction is always spontaneous. A As is (pick one) This reaction is spontaneous except below ΔΗ is (pick one) 38. °C but proceeds at a faster rate above (pick one) 91. °C As is ΔΗ iS (pick one) Crystallization of a pure compound is C spontaneous only below 146. °C. AS is (pick one) X
State three natural conditions under which plasmolysis could occur
Answer:
When the cell is placed in salt solutionWhen leave celss dryWhen cells are placed in sugar solutionExplanation:
Hope this helps
The concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubility
which has maximum number of molecules among 7 gram of nitrogen, 16 gram of NO2 16 gram of oxygen and 2 gram of hydrogen
Answer:
2 g of H₂
Explanation:
We have:
7 g of N₂
16 g of NO₂
16 g of O₂
2 g of H₂
Let's count to verify the moles:
7 g . 1 mol / 28g = 0.25 moles of nitrogen
16 g . 1 mol / 46g = 0.348 moles of nitrogen dioxide
16 g . 1mol /32g = 0.5 moles
2 g . 1 mol / 2g = 1 mol
The biggest number of moles is in the hydrogen.
1 mol of anything contains NA particles
1 mol of oxygen contains 6.02×10²³ molecules, the maximun number
What is the molar mass of 12?
Answer:
I assume your talking about carbon when you say 12 so it'd be 12 grams if you are
Explanation:
The molar mass of any substance in grams per mole is numerically equal to the mass of that substance expressed in atomic mass units.
Hope this helps you some
Draw the structure of the neutral organic product formed in the reaction. Do not draw counterions or byproducts.
Answer: Hello the reaction related to your question is missing attached below is the reaction
answer : attached below
Explanation:
The structure of the neutral organic product formed in the reaction is attached below.
The neutral organic product formed is ESTER
The reaction in the question is Anhydride on reaction with alcohol
HELP ME PLZ AND THANKS I WILL MARK YOU AS BRAINLIEST!!!
Answer:
Final pressure = 6 atm
Final volume = 1.1 L
Final temperature = 100 K
Explanation:
We are given;
Initial Pressure; P1 = 2 atm
Initial volume; V1 = 3.3 L
Initial temperature; T1 = 27° C + 273 = 300 K
Final pressure; P2 = 6 atm
We will use Boyles law to get the final volume.
P1V1 = P2V2
V2 = (P1 × V1)/P2
P2 = (2 × 3.3)/6
V2 = 1.1 L
We can use Charles law to find the final temperature.
V1/T1 = V2/T2
T2 = (V2 × T1)/V1
T2 = (1.1 × 300)/3.3
T2 = 100 K
At STP, which gaseous sample has the same number
of molecules as 5.0 liters of O2 (g)?
A) 6.0 L of F2 (g)
C) 3.0 L of H2 (g)
B) 4.5 L of O2 (g)
D) 5.0 L of Cl2 (g)
