A stimulus has opened the voltage-gated sodium channel in an area of a neuron's plasma membrane. As a result, sodium rushes into the neuron and diffuses to adjacent areas; this in turn results in the opening of voltage-gated sodium channels in the adjacent areas. Thus, option "c" is correct.
When the potential in the membrane rises above the threshold energy, the natrium voltage-gated sodium channels will be opened. The opening of the natrium voltage-gated sodium channels will allow the movement of sodium to the cells. This happens because the concentration of sodium outside the cell is much higher than inside the cells, the sodium will flow into the cells.
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The grey kitten jumped into a 85 degree Celsius tub of water causing the tub to overflow. Identify the intensive and extensive properties of the scenario. Describe one physical property.
The intensive properties in this scenario are specific heat, temperature, density of water etc. The extensive properties include heat capacity, volume and mass of water.
What are intensive properties?Intensive properties are those properties which does not change with the amount of the substance. Whereas, extensive properties depends on the mass or total amount of the substance. It changes with the change in amount of the substance.
Intensive properties includes temperature, pressure, density etc. Whereas examples of extensive properties include mass, volume, heat capacity etc.
In the given scenario temperature and density of water does not change as they are intensive. Mass, volume and heat capacity of water changes as the kitten jump into it since they are extensive.
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Fe(OH)3 →
Fe₂O3 +
H₂O
Answer:
Explanation:
The balanced chemical equation for the reaction of Fe(OH)3 to Fe₂O₃ and H₂O is:
3 Fe(OH)3 -> Fe2O3 + 3 H2O
In this reaction, Fe(OH)3, also known as ferric hydroxide, reacts with water to form Fe₂O₃, also known as iron(III) oxide, and H₂O, also known as water. The reaction is a redox reaction, in which Fe(OH)3 is oxidized to Fe₂O₃, and the water molecules are reduced to H₂O.
The reaction is typically carried out at high temperatures to speed up the reaction and increase the yield of Fe₂O₃. The reaction is commonly used in the production of iron(III) oxide, which is used as a pigment in paints, ceramics, and other materials. It is also used in the production of iron from iron ore.
The balanced chemical equation is 3 Fe(OH)₃ -> Fe₂O₃+ 3 H₂O for the given reaction.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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The total pressure of gas collected over water is 680.0 mmHg and the temperature is 21.0 C. What is the pressure of hydrogen gas formed in mmHg?
To solve such this we must know the concept of redox reaction. Therefore, the pressure of hydrogen gas formed in mmHg is 661.35mmHg.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
total pressure= pressure of gas + pressure of water vapor
total pressure= 680.0 mmHg
pressure of water vapor at 21 °C=18.65mmHg
substituting all the given values in the above equation, we get
680.0 = pressure of gas + 18.65
pressure of gas =680- 18.65
=661.35mmHg
Therefore, the pressure of hydrogen gas formed in mmHg is 661.35mmHg.
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The valence electrons of an atom do not experience the full attractive force of protons in the atom’s nucleus due to the presence of inner core electrons.
The reduction in nuclear charge experienced by valence electrons due to inner core electrons is called the
A. ionization energy effect.
B. nuclear charge effect.
C. periodic law effect.
D. shielding effect.
The term "shielding effect" describes how the presence of core/core electrons reduces the positive charge experienced by the core/valence electrons.
What is shielding effect?The shielding effect is known as the reduction of the effective nuclear charge of the electron cloud as a result of the change in the attractive force acting on the electrons of the atoms. This particular case of electric field filtering is unique. Many projects in the field of materials science also consider this effect. The term "shielding effect" describes the reduction in positive charge experienced by the outer/valence electrons as a result of the presence of inner/core electrons. It prevents the outer/valence electrons from fully benefiting from the positive charge coming from the nucleus.
Due to the increased amount of core electrons, the shielding is enhanced when traveling downhill in groups. The amount of core electrons remains constant as it does not change as it moves over a period of time.
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For the reaction, A(g)⇋2B(g) , Kc=7.0 . A reaction mixture at equilibrium contains [A]=2.3M . What is the concentration of B in the reaction mixture?
Express the molarity to two significant figures and include the appropriate units.
Answer: [tex][B]=16 \text{ M}[/tex]
Explanation:
[tex]K_c=\frac{[B]}{[A]}\\\\7.0=\frac{[B]}{2.3 \text{ M}} \\ \\[/tex]
[tex][B]=16 \text{ M}[/tex]
intermolecular forces are in liquids and solids when compared to gases. the strength of the interactions in the condensed phases determines at what temperature the substance will melt and boil.
True. Intermolecular forces in liquids and solids are stronger than those in gases. This is because the molecules in liquids and solids are much closer together than those in gases, so the attractive forces between them are stronger.
The stronger the intermolecular forces, the higher the temperature needed to break them and cause the substance to boil or melt.
The Significance of Intermolecular Forces in Liquids and SolidsIn the physical world, the behavior of matter is determined by the forces that act on it. Intermolecular forces, the attractions and repulsions between molecules, are one of the fundamental forces that drive the properties of matter. This essay will explore the role of intermolecular forces in liquids and solids and explain how they contribute to the melting and boiling points of substances.
In liquids and solids, the molecules are much closer together than in gases, so the attractive forces between them are stronger. This is due to the fact that in liquids and solids, the molecules are more densely packed, allowing for greater attraction between them. The stronger these intermolecular forces are, the higher the temperature needed to break them apart, resulting in the melting and boiling point of a substance. This can be seen in the phase diagram for water, where the melting point is 0°C and the boiling point is 100°C.
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A soft drink contains 28 mg of sodium in 305 g of H2O?
What the concentration of sodium in the soft drink in mass percent?
The concentration of sodium in the soft drink in mass percent is 9.179485 x 10⁻³ %.
Percentage by mass, mass %, is a measure of concentration that indicates the mass of solute per mass of solution. In other words, the mass percent of a component in the solution is defined as the ratio of the mass of the component to the mass of the solution, expressed as a percentage.
mass % = (mass of solute / mass of solution) x 100
In the case of a soft drink which contains 28 mg of sodium in 305 g of H₂O, sodium is the solute and the solution is the mixture of sodium and H₂O.
mass % = (mass of solute / mass of solution) x 100
mass % = (28 mg / 28 mg + 305 g) x 100
mass % = (28 mg / 305028 mg) x 100
mass % = (9.179485 x 10⁻⁵) x 100
mass % = 9.179485 x 10⁻³ %
Hence, the mass percent of sodium in the soft drink is 9.179485 x 10⁻³ %.
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Explain how the interactions between molecules cause the difference in the state of nitrogen and water.
PLEASE I NEED THIS ANSWER ASAP --- DUE MONDAY DEC 5
Nitrogen is a non -polar because its molecule have Van der Waals force of attraction while water is a liquid because its molecule have hydrogen bonding .
What is interaction between molecules ?Molecular Interactions are between molecules that are not linked by bonds. Molecular interactions include cohesive attraction between like, adhesive attraction between unlike and repulsive forces between molecules. whether polar or non- polar are attracted to one another by dispersion forces
There are four types of interactions:
ionic covalent hydrogen bondsvan der Waals interactionsTherefore molecular interaction are between molecules that are not linked by bonds either nitrogen or water.
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Equilibrium osmotic pressure heads h measured at 22 degrees C for a series of solutions of a polystyrene sample in toluene are tabulated below: Assuming that the densities of toluene and polystyrene at 22 degrees C are, respectively, 0.867 g cm^-3 and 1.05 g cm^-3, calculate the following. a. The number-average molar mass for the sample of polystyrene. b. An estimate of the Flory-Huggins polystyrene-toluene interaction parameter.
The average molar mass and interaction parameter constant is 23.4g and 1.8746 respectively.
The following is an example of an osmotic pressure equation that was discovered by Dutch chemist Jacobus to exist in a quantitative relationship between osmotic pressure and solute concentration.
π=iCRTWhere,.
The osmotic pressure is represented by π.The van 't Hoff index has no dimensions.The solute concentration in the solution, c, is measured in moles.The ideal gas constant is known as R.The temperature in kelvins is denoted by T.It is crucial to remember that the derived Osmotic Pressure equation only applies to solutions that behave exactly like ideal solutions. Because pure water has no osmotic pressure.
B = ln [p1/ (1-p1)] / (1 - 2p1) = ln [p1- ln (1-p1)] / (1 - 2p1)
T=22 +273K=295K
Average molar mass=pv/RT =1.05 x 22.4/8.3 x 295= 23.4gFlory Huggins interaction parameter for polystyrene toluene= B = ln [p1/ (1-p1)] / (1 - 2p1)p1=0.867, p2=1.05
B=1.8746
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Lavasha's backpack holds up to 62.75 kilograms. What is this mass expressed in grams?
O62750 g
O 6.275 g
O 0.06275 g
O6275 g
Hello,
I hope you and your family are doing well!
To convert a mass from kilograms to grams, we can multiply the mass by 1000, since there are 1000 grams in 1 kilogram.
Therefore, the mass of Lavasha's backpack expressed in grams is:
62.75 kilograms * 1000 grams/kilogram = 62750 grams
So Lavasha's backpack has a mass of 62750 grams.
Answer: A
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Happy Holidays!
An organic molecule contains 2.088 Liters Carbon, 2.688 Liters Hydrogen, and 0.896 Liters oxygen. Calculate the Empirical formula.
The empirical formula of the organic molecule, given that it contains 2.088 L Carbon, 2.688 L Hydrogen and 0.896 L oxigen is C₃H₄₈O
How do I determine the empirical formula?The following data were obtained from the question:
Carbon (C) = 2.088 LHydrogen (H) = 2.688 LOxygen (O) = 0.896 LEmpirical formula =?The empirical formula of the organic compound can be obtained as follow:
Divide by their molar mass
C = 2.088 / 12 = 0.174
H = 2.688 / 1 = 2.688
O = 0.896 / 16 = 0.056
Divide by the smallest
C = 0.174 / 0.056 = 3
H = 2.688/ 0.056 = 48
O = 0.056 / 0.056 = 1
Thus, we can conclude that the empirical formula of the organic molecule is C₃H₄₈O
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An aqueous solution at 25°C has a pOH of 6.51. Calculate the pH. Be sure your answer has the correct number of significant digits.
The pH of the solution at the given condition will be 7.5 .
Since the solution is at 25°C which is the standard temperature, we can apply the following relation :
pH = 14.00 - pOH
In the given case the pOH of the solution is 6.51, which on substituting in the relation we get
pH = 14.00 - 6.51
pH = 7.49 ≈ 7.5
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Extraction of natural gas by the process of hydraulic fracturing (fracking) is most likely to result in which of the following environmental problems?
Select one:
a. Groundwater contamination
b. Denitrification
c. Eutrophication
d. Desertification
e. Ozone depletion
a. The biggest concerns at fracking sites are groundwater contamination, air pollution, and water contamination brought on by the toxic chemicals employed in hydraulic fracturing.
Which one of the following best represents an environmental issue that is frequently connected to the fracking process?Large land areas are needed for fracking operations, which affects wildlife and ruins habitat.
What environmental issues are most frequently connected to nuclear power apes?Pollutants such as spent (used) reactor fuel, uranium mill tailings, and other radioactive wastes are the main environmental issue with nuclear power.These substances have lengthy radioactive half-lives and can endanger human health for tens of thousands of years.
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Calculate the percentage (by mass) of sodium in sodium bicarbonate (NaHCO3). Hint: Use the molar masses as the masses of Na and NaHCO3.
The percentage of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3) is 27.25%. Percent by mass of sodium = (total mass of sodium/ formula weight) * 100
How to solve?Percent by mass of an element =(Total mass of the element in the formula / weight ) * 100
Step 1 :Formula weight of NaHCO₃
The atomic mass of Na, H,C and O
Formula weight of NaHCO₃ = Na+H+C+3O
Formula weight of NaHCO₃ = 22.9+1.01+12.01+3(16)
Formula weight of NaHCO₃ is 84.01 g
Step 2 :Use percent by mass formula,
Percent by mass of sodium = (total mass of sodium / formula weight) * 100
Percent by mass of sodium = (22.9)/84.01*100
Percent by mass of sodium = 27.25%
Thus, the percentage by mass of sodium in a formula unit of sodium hydrogen carbonate (NaHCO3) is 27.25%.
How is a molar mass calculated?Molar mass = g/mol, The mass of one atom of carbon-12 the atomic mass of carbon-12 is exactly 12 atomic mass units. The mass of one mole of carbon atom is exactly 12 grams; its molar mass is exactly 12 grams per mole.
How do I calculate molarity?The most common way to express solution concentration is molarity (M), which is defined as the amount of solute in moles by the volume of solution in liters: M = moles of solute/liters of solution.
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For the reaction PCl5(g)⇌PCl3(g)+Cl2(g),
the equilibrium constant Kc=1.1×10−2 at 400 K.
Part A
What is the equilibrium constant for the reaction PCl3(g)+Cl2(g)⇌PCl5(g) at 400 K?
The equilibrium constant for the reaction PCl₃(g)+Cl₂(g) ⇌ PCl₅(g) at
400K is 1/Kc.
How big of a K equilibrium constant is there?The ratio of the amount of reactant to the amount of product that is used to predict the chemical behavior of a reaction is known as the equilibrium constant for chemical reactions. The rate constants remain unchanged at a specific temperature.
When the reactants and products do not change in any significant way over time, this is known as chemical equilibrium. When the forward and reverse reactions happen at the same rate, this is the condition. The equilibrium constant, K, serves as a description of this state of equilibrium.
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Which of the following functional groups can be reduced by reaction with metal hydride reagents such as LiAlH4?
LiAlH4 reagent can reduce aldehydes to primary alcohols, ketones to secondary alcohols, carboxylic acids and esters to primary alcohols, amides and nitriles to amines, epoxides to alcohols and lactones to diols.
LiAlH4 is a powerful reducing agent compared to sodium borohydride, NaBH4, since the Al-H bond is weaker and thus less stable than B-H bond.
Reduction of aldehydes or ketone to primary and secondary alcohols:
Initially, a hydride ion is transferred onto the carbonyl carbon and the oxygen atom coordinates to the remaining aluminum hydride species to furnish an alkoxy tri hydro aluminate ion, which can reduce the next carbonyl molecule. Thus three of the hydride ions are used up in reduction. The reaction will be as follows :
AlH4 + ROR → RHROH
Reduction of amides to amine:
Amides are converted to amines. The LAH reduction mechanism is slightly different from that depicted for esters. In iminium ion is formed during the reaction since nitrogen atom is relatively a good donor than oxygen atom. The reaction will be as follows:
RONR2 + AlH4 → RNR2
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Which of the following equations is paired correctly with the type of change? *
Physical change: C6H1206 (s) + 6 02 (g) 6C02 (g) + 6 H20 (1)
1
Chemical change: NaCl (s) Na (1) + Cl (1)
Physical change: H20 (s) → H20 (1) Chemical change: CO2 (s)- CO2 (g)
-
Answer: Physical change: H20 (s) → H20 (1)
Chemical change: C6H1206 (s) + 6 02 (g) 6C02 (g) + 6 H20 (1)
Explanation:
A chemist must prepare 650.mL of 7.00 M aqueous potassium iodide (KI) working solution. He'll do this by pouring out some 7.46 mol/L aqueous potassium iodide stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the potassium iodide stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
The quantity in mL of the iodine solution standard solutions that the scientist should pour out is provided as V1 = 609.9 mL according to the supplied statement.
What occurs if your potassium level is low?A potassium deficiency level can cause irregular heart rhythms to form and cause muscles to feel weak, cramp, or even become paralyzed. Tests of the potassium level in the blood are used to make the diagnosis. Typically, all that is required is consuming meals high in potassium or ingesting potassium supplements.
Do eggs have a lot of potassium?About 63 milligrams of potassium may be found in one big egg. 1 Although eggs are regarded as a low-potassium food, talk to your doctor or nutritionist to see how frequently you should consume them.
Briefing:
C1 = 7.46mol/L
C2 = 7.00 M
V1 = ?
V2 = 650mL
C1.V1 = C2.V2
V1 = 609.9 mL
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Write the formula of the conjugate base of C₆H₅NH₂.
The formula for conjugate base is C₆H₅NH₂ and C6H5NH3+ is the conjugate acid.
What is conjugate base?
Conjugate base is defined as when an acid loses a hydrogen ion, a compound is produced. When a proton is added to a base, a conjugate acid is created, and vice versa when a proton is taken away from an acid, a conjugate base is created.
Conjugate acid is defined as a chemical molecule created when an acid gives a base a proton (H). A conjugate acid-base pair is made up of two bases that only differ by the presence or absence of a proton.
Thus, the formula for conjugate base is C₆H₅NH₂ and C6H5NH3+ is the conjugate acid.
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The ___ something is before it falls, the longer gravity can act on the object.
higher
lower
Answer:The higher something is before it falls, the longer gravity can act on an object.
Explanation:
When something is dropped from higher up it has more time to fall thus giving gravity more time to act on the object.
Take a look at this link for more information.
http://faculty.ric.edu/psci103/newton/newton_notes.pdf
What is the pH change of a 0.280 M solution of citric acid (pK₂ = 4.77) if 0.135 M citrate is added with no change in volume?
The pH change of a 0.280 M solution of citric acid is 1.7917.
What is citric acid and why is it useful?
Citric acid was originally produced from lemon juice by a Swedish researcher in 1784.
The odorless and colorless substance was manufactured from lemon juice until the early 1900s when researchers discovered that it could also be made from the black mold Aspergillus niger, which generates citric acid as it feeds on sugar.
Because of its acidic, sour-tasting character, citric acid is largely utilized as a flavoring and preserving agent, especially in soft drinks and candies. It’s also used to stabilize or preserve pharmaceuticals and as a -disinfectant.
As, in the question we have been provided with the pK2, so we will first convert it into ka.
ka= 10 ^ -4.77= 1.70 × 10 -5
⇒1.70 × 10- 5 = x²/ 0.280 -x
⇒x= [H+] = 0.00218 M
pH = - log [0.00218]
pH = 2.6615 initial pH
pH= pKa + loh [salt/acid]
pH= 4.77 +log [0.135/0.280]
pH= 4.77 - 0.3168 = 4.4532
change pH= 4.4532 - 2.6615 = 1.7917.
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How many particles are in
0.451 moles of CU₂SO4?
Answer:
2.72 x 10^23 particles
Explanation:
1 mol of CU2SO4 has 6.022 x 10^23 particles
so 0.451 mol will have 0.451 x (6.022 x 10^23) = 2.72 x 10^23 particles
Explain one way that water affects humans
Answer: Our body needs water to transfer blood through the body.
Explanation: Our heart needs water to help pump blood through the whole body. Outside of transferring blood, we need water for a lot of other things like helping keep our body temperature and more!
The answer is that our bodies needs water to transfer blood through the body.
Need help with this please
a) NaCl + H2O
c) POLi + HCO3
5) 5.2 mol of Xe is at 350 °C in a vessel of 5:00 L. For Xe, a-
4.250 atmL/mol and b- 5.105 x 10 L/mol. Calculate the
pressure assuming the Xe behaves:
a. Ideally.
b. As a real gas.
The pressure of the gas can be obtained in each case as;
a) 53.1 atm
b) 51.56 atm
What is an ideal gas?We know that an ideal gas is the kind of gas that follows the ideal gas law. We know that we can be able to calculate the pressure of the gas using the Ideal gas equation as well as by the use of the Van Der Walls correction of the equation.
Thus we have;
PV = nRT
P = pressure
V = volume
n = Number of moles
R = gas constant
T = Temperature
Then;
P = nRT/V
P = 5.2 * 0.082 * 623/5
P = 53.1 atm
Using the Van Der Walls Correction;
P = nRT/V - nb - a(n/V)^2
P = 5.2 * 0.082 * 623/5 - (5.2 * 0.05105) - 4.250(5.2/5)^2
P = 265.6 /4.73 - 4.597
P = 51.56 atm
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Draw the Lewis structure for the polyatomic phosphite (PO3 anion. Be sure to include all resonance structures that satisfy the octet rule.
We may arrange the valence electrons around the center atom of PO3-3 and try to fill each atom's outer shell once we learn how many exist. Its PO3 3- Lewis structure is made up of 26 valence electrons.
How can one recognize polyatomic?Only a few of the elements in the periodic table have a following letter that is lowercase after their first capital letter. Therefore, you can tell an ion is polyatomic if it has two capital letters together.
Oxygen – polyatomic or not?However, the majority of elements are found in molecules made up of two or maybe more atoms. We refer to these as polyatomic elements. The oxygen family of elements, which includes oxygen.
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A pure copper sphere has a radius 0.930 in. How many copper atoms does it contain? [The volume of a sphere is (4/3)πr3 and the density of copper is 8.96 g/cm3 .]
A pure copper sphere has a radius 0.930 in, 47.68 x 10²³ copper atoms does it contain.
What is Avogadro's no?The Avogadro number, often known as the Avogadro constant, is the quantity of units contained in one mole of any material. It equals 6.022140857 ×10²³. Depending on the nature of the reaction and the material, the units might be electrons, ions, atoms, or molecules.
Given that,
density = 8.96g/cm³
radius of sphere (r) = 0.935 in
= 0.935 x 2.54 cm
= 2.3749 cm
Thus, volume of copper sphere,
V = 4/3 π r³
V = 4/3 π (2.3749 cm)³
V = 56.108 cm³
From the volume and given density, calculate the mass of the copper sphere:
As we know, mass = density x volume
or, mass = 8.96 x 56.108
or, mass = 502.73 g
Now, 1 mole of copper = 63.5 g of copper = 6.022 x 10²³ copper atoms.
502.73 g of copper = (502.73 × 6.022 × 10 ²³)÷ 63.5
= 47.68 x 10²³ copper atoms
Therefore, the copper sphere contains 47.68 x 10²³ copper atoms.
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23 grams of sodium Chloride reacts with oxygen to produce Sodium oxide and how many moles of chlorine?
Question 3 options:
9.14 mol
4.98 mol
.20 mol
.87 mol
Common salt, sometimes referred to as sodium chloride, is a substance consisting of sodium and chlorine atoms. One mole of sodium chloride (23 grams) interacts with one mole of oxygen to produce two moles of sodium oxide and one mole of chlorine. This reaction is known as the sodium chloride–oxygen reaction (NaCl–O2).
How much sodium chloride is in a mole of chlorine?The molar masses of sodium (Na) and chlorine (Cl) are respectively 22.99 g/mole and 35.4 g/mole.
One mole of sodium chloride contains how many moles of sodium?If I take a mole of NaCl, there will either be one mole of Na and zero Cl2 molecules, or two moles of Na and two moles of Cl2 molecules on either side.
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how you would use electronegativity to decide if this substance has ionic or covalent bonds.
F2 <----- substance
Answer:
Explanation:
If the EN difference is large then it has an ionic bond, if it's low it has a covalent bond.
Can you help me with this please
No, the driver is not legally dr unk in PA.
What is absorbance?Absorbance is a measure of how well a material absorbs light. It is a logarithmic measure of the light that is absorbed by a material, rather than the light that is reflected or transmitted. Absorbance is also known as optical density, and is represented by the unit of absorbance, the absorbance unit (AU). Absorbance is used to measure the amount of light that is absorbed by a given material, and can be used to measure the concentration of a given material in a solution.
The absorbance reading of .635 is equivalent to a blood alcohol level of 0.064%, which is lower than the legal limit of 0.08%. The absorbance reading is calculated by the formula A = εcl, where A is absorbance, ε is the molar absorptivity (3.52 cm in this case), c is the concentration (0.064% in this case), and l is the path length (1 cm in this case).
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