The sodium-potassium pump goes to work after the contraction has occurred in order to repolarize the cells.
What is the sodium-potassium pump?The sodium-potassium pump is a pump that functions in transporting sodium ions out of the cell and potassium ions inside the cell.
At the resting membrane potential, the sodium-potassium pump ensures that the interior of the cell is negative relative to outside the cell because three sodium ions are pumped out of the cell for every two potassium ions that are pumped into the cell.
When an action potential reaches the cell, the pump opens and allows sodium ions into the cell thereby depolarizing it. Afterward, the sodium-potassium pump works to repolarize the cell by pumping sodium out and potassium in.
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You have 505 mL of a 0.140 M HCl solution and you want to dilute it to exactly 0.100 M. How much water should you add?
The volume of water that should be added in the given solution is equal to 202 ml.
What is the dilution law?The concentration or the volume of the dilute or concentrated solution can be calculated from the following equation:
M₁V₁ = M₂V₂
where M₁, V₁, M₂, and V₂ are the concentration and volume of the concentrated solution and dilute solution respectively.
Given, the concentration of the solution, M₁ = 0.14 M
The concentration of the diluted solution, M₂ = 0.100 M
The volume of concentrated solution, V₁ = 505 ml
Put the value of the molarity and volume in equation (1):
(0.140)× (505) = (0.100) × (V₂)
V₂ = 707 ml
The amount of water should be added = 707 - 505 = 202 ml
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Arrange the following transitions in from most energy absorbed to most energy emitted.
n=3 <— n=5
n=1 —> n=3
n=2 —> n=4
n= 2 <— n=4
n=3 <— n=5, n= 2 <— n=4 are most energy emitted and n=1 —> n=3, n=2 —> n=4 are most energy absorbed
In chemistry, energy is the capacity to carry out work. It may take on a variety of shapes, including potential, kinetic, thermal, electrical, chemical, radioactive, etc. Heat and labor are other examples of energy being transferred from one body to another. Once it has been transported, energy is always allotted according to its kind. Thus, heat transmission might manifest as thermal energy, but work could produce mechanical energy.
All energy kinds have the characteristic of motion. For instance, a body has kinetic energy if it is moving. A tensioned item, such as a spring or bow, has the capacity to move even while at rest; this property results from the design of the object, which incorporates potential energy.
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If an element is bonded to 4 other atoms and has a formal charge of +1, what group must the element be in?
A) 5A
B) 6A
C) 7A
D) 3A
E) 4A
1. What does Heisenberg's principle of uncertainty state about the position and velocity of an electron
Neither can be measured with any level of certainty at the same time.
Only one can be measured with some level of certainty at a given time.
Both can be measured with a low level of certainty at the same time.
Both can be measured when a high level of certainty at the same time.
Answer:
Both can be measured with a low level of certainty at the same time.
it depends on what you count as low or high levels of uncertainty though.
Explanation:
The equation is something like:
[tex]\Delta x \Delta p \geq \frac{h}{4 \pi}[/tex]
delta x is the uncertainty (not change) of position, and delta p is the uncertainty of momentum. then term on the right is a constant (in this case, a very small number)
This equation tells us that neither the uncertainty of position nor the uncertainty of momentum can be zero, which means that there will always be some uncertainty. However, we can note that both of the uncertainties can be quite small at the same time, they just can't be smaller than h/4pi. This means that both can be measured with a fairly high level of certainty at the same time. However, there is a limit of how high the values can be, so i would expect that the answer your teacher is looking for is that both can be measured with a low level of certainty at the same time. This is always true, as opposed to saying that both can be measured when a high level of certainty at the same time, since high is quite subjective
What is kintec energy?
The following reaction takes place: 2K + 2H20 ---> 2KOH + Hz
a. Calculate the number of moles of hydrogen that will be produced if 11.5 g of potassium are reacted.
b. Calculate the number of grams of hydrogen that will be produced in this same reaction.
As per the balanced reaction, 2 moles of potassium gives 2 moles of hydrogen molecules. Thus 11.5 g or 0.302 mol will produce 0.302 moles of hydrogen. The mass of 0.302 mol of hydrogen is 0.604 g.
What is hydrolysis ?Hydrolysis is the reaction of a substance with water to form hydroxides or hydrides. The given reaction is hydrolysis of potassium giving 2 moles of H2.
The atomic mass of potassium is 38 g/mol. Thus the mass of 2 mole of potassium is 38 × 2 = 76 g. The number of moles in 11.5 g K is 0.302 moles. 2 moles of potassium gives 2 moles of H2, thus 0.302 moles gives 0.302 moles of H2.
The molecular mass of H2 is 2 g/mol. Thus mass of 0.302 moles is 0.302 × 2 = 0.604 g.
Hence, the mass in grams of hydrogen produced is 0.604 g.
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1 According to the law of conservation of mass, the total mass of the reacting substances is
A always more than the total mass of the products.
B always less than the total mass of the products.
C sometimes more and sometimes less than the total mass of the products.
D always equal to the total mass of the products.
According to the law of conservation of mass, the total mass of the reacting substances is
A. always more than the total mass of the products.
B. always less than the total mass of the products.
C. sometimes more and sometimes less than the total mass of the products.
D. always equal to the total mass of the products.
This is the one that I would have to choose.
Hope this helps:)
Can you please help to learn more about chemical bonding cause I’m having a hard time learning it.
Answer:
Chemical bonding is the process by which atoms are held together to form molecules. The bond between atoms is created by the sharing of electrons. The electrons are attracted to the nucleus of the atoms, which creates a force that holds the atoms together.
Is copper a fcc or bcc?
Answer: copper is a fcc.
Explanation:
Solid copper can be described as the arrangement of copper atoms in a face-centered-cubic (fcc) configuration.
Solid copper can be described as the arrangement of copper atoms in a face-centered-cubic (fcc) configuration.
Two of the most recognizable crystal shapes are face-centered cubics (FCC) and body-centered cubics (BCC). There are FCC, BCC, or HCP structures for almost all elements.
The atomic configurations are where FCC and BCC crystals diverge most drastically. All 8 corner positions and the centers of each of the six faces are occupied by atoms in the face-centered cubic structure. All eight corner positions and the cube's center are occupied by atoms in the body-centered cubic structure.
Compared to BCC metals, FCC metals are often more ductile, more stable at high temperatures, and more dense. This is a result of their packaging design and slip systems.
The most effective atomic configuration is found in FCC (tied with HCP).
Because of this, we refer to FCC as a "close-packed" structure. FCC metals will typically be more dense and stable because FCC atoms are grouped more tightly together than BCC atoms.
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2. What kinds of events develop over oceans?
O avalanches
O hurricanes
O landslides
O solar flares
Arsenic is in the same family as this element that has a mass of 14.
Answer:
below
Explanation:
From periodic table:
Arsenic is a metalloid in the family with Silicon (Si) which has a mass of 14
What is the concentration of sodium ions in 0.130 M Na₂HPO₄?
The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
The Na₂HPO₄ will dissociates in to ions we get :
Na₂HPO₄ ----> 2Na⁺ + HPO₄⁻
here from the above equation it is clear that,the 1 moles of Na₂HPO₄ produce the 2 moles of Na⁺ and 1 mole of Na₂HPO₄ will produce 1 mole of HPO₄⁻.
the concentration of Na⁺ = ?
concentration of the Na⁺ = 2 × Na₂HPO₄
concentration of the Na⁺ = 2 × 0.130 M
the concentration of the Na⁺ = 0.26 M
Thus, The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
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5. WHICH OF THE FOLLOWING IS NOT A COVALENT COMPOUND? *
A. CCl4
B. H2O
C. Al3O2
D. CO2
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. CCl[tex]_4[/tex], H[tex]_2[/tex]O, CO[tex]_2[/tex] are ionic compound. Al[tex]_2[/tex]O[tex]_3[/tex] is an ionic compound.
Therefore, the correct option is option C.
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Carbon dioxide formation
Carbon dioxide is generated when any substance that contains carbon is burned. It is also a product of respiration and fermentation. Plants absorb carbon dioxide during photosynthesis.
PLEASE HELP I LAREADY FAILED ONCE
What is the mass of 6.02 x 10^^24
molecules of hydrogen, H2? The molar
mass of H2 is 2.02 g/mol.
A- 2.02 g H2
B- 2.98 x 10^24 g H2
C- 10.0 g H2
D- 1.22 x 10^25 g H2
Answer: a
Explanation:
A weather balloon has a volume of 556 L when filled with helium at 30 C at a pressure of 386 torr. What is the new volume of the balloon (in liters) if the balloon rises to a point where the air
pressure is 229 torr and the temperature is -9 C
The new volume of the balloon will be 484.43 L.
This is an example of Charles' law, sometimes called the temperature-volume law. It states that the volume of a gas is directly proportional to the Kelvin temperature, while pressure and amount are held constant.
The equation is V1/T1=V2/T2, where V is volume and T is temperature in Kelvins.
Known
V1=556 L
T1=30∘C+273.15=303 K
T2=-9∘C+273.15=264 K
Unknown
V2
Solution
Rearrange the equation to isolate V2. Substitute the known values into the equation and solve.
V2=V1T2/T1
V2=(556L×264K)/303K=484.43 L.
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The question is in picture below, help!
Answer: What are the answer choices?
Explanation: I need answer choices to see, there are a lot of definitions, verbs and nouns for an answer.
If 96.3 g of A1203 decomposed, determine the percent yield of 02 if you
isolated 43.2 g 02.
2Al₂O3 →4A1+30₂
Your answer
25 points
2
I need answer asap
If actual yield and theoretical yield are same then the percent yield will be 100%. Generally, the actual yield is lower than the theoretical yield. The percent yield of 0₂ is 93%.
What is percent yield?Percent yield is the percent ratio of actual yield to the theoretical yield.
Mathematically,
Percent yield= actual yield of a product÷ theoretical yield of the product
The balanced reaction is
2Al₂O₃ →4A1+30₂
moles of Al₂O₃=given mass÷ molar mass
=96.3 g ÷100g/mol
=0.96moles
From 2 mole of Al₂O₃, 3 moles of 0₂ is produced
From 0.96moles of Al₂O₃=(3÷2)×0.96moles of 0₂
=1.44moles of 0₂
mass of 0₂=moles of 0₂×Molar mass of moles of 0₂
mass of 0₂=1.44×32
=46.08g
Percent yield= 43.2 g÷46.08g=93%
Therefore the percent yield of 0₂ is 93%.
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4 Determine the missing reactant for the following combustion reaction: 2 + 1502 →14CO2+ 6H₂O.
A C₁4H₁2
B C₁4H12O4
C C₂H6
D C-H₂O₂ 2
The correct reactant that matches the equation is c)C₇H₆.
The missing reactant for the combustion reaction is C₇H₆. The complete reaction would be
2C₇H₆ + 1502 →14CO2+ 6H₂O.
C7H6 is a hydrocarbon molecule. The name of this molecule is heptendiin
If heptendiin is heated in the presence of oxygen, it will undergo combustion to form carbon dioxide and water vapor. When heptendiin is burned in air, the products of combustion are carbon dioxide and water vapor.
The combustion of this compound is a exothermic reaction, meaning that it releases heat on burning to give out Carbon-di-oxide and Water.
When 2 moles of C₇H₆ reacts with 15 moles of Oxygen, it gives 14 moles of Carbon-di-oxide and 6moles of water molecule.
Therefore the missing reactant, that gives out water and carbon-di-oxide is C₇H₆. Hence, the correct option is c)
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10. How many grams of KOH are needed to make a 2.00 M solution?
Answer: The mass of KOH needed is 28 grams
Explanation:
Molarity: It is defined as the number of moles of solute present in one liter of solution.
In this question, the solute is KOH.
The formula used: M = N/V
wb = mass of solute KOH = ?
mb = molar mass of solute KOH = 56 g/mole
V = volume of solution = 250 ml
Molarity = 2.00 M = 2.00 mole/L
Now put all the given values in the above formula, and we get the mass of KOH.
Now put all the given values in the above formula, and we get the mass of KOH.
Therefore, the mass of KOH needed is 28 grams.
Answer: 28 grams
Explanation:
2molarity/L= Mass of KOH/ 56g/molarity multiplied by 250ml multiplied by 1000 *Hope it helped*
How are nuclear reactions different from chemical reactions?
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. Different isotopes of an element normally behave similarly in chemical reactions.
I hope this helps!
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138 atm . What is the molar mass of the protein?
The molar mass of the protein under the conditions that we have in this question can be obtained to be 12065 g/mol.
What is the molar mass of the protein?We know that the osmotic pressure is one the colligative properties of the solution. The colligative properties are the properties that depend on the amount of substance that is present in the solution.
Mass of the protein = 0.135 g
Volume of the solution = 2.00 mL
Temperature of the system = 28 ∘C + 273 = 301 K
Osmotic pressure of the solution = 0.138 atm
We can get the osmotic pressure from;
π = iCRT
π = Omotic pressure
i = Van't Hoff factor
C = concentration of the solution
R = gas constant
T = temperature
Let the molar mass of the protein be M
0.138 = 1 * 0.135/M/0.002 * 0.082 * 301
0.138 = 1 * 0.135/0.002M * 0.082 * 301
0.138 = 3.33/0.002M
0.138 * 0.002M = 3.33
M = 3.33/0.138 * 0.002
M = 12065 g/mol
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A flask with a volume of 125.0 mL contains air with a density of 1.241 g/L.What is the mass of the air contained in the flask?
Answer:
Below
Explanation:
125 ml = .125 L
.125 L * 1.241 g/ L = . 155 g
Predict a product of the following reaction:
Al + CuCl2→
Answer:
CuCl2 + Aluminum = Chemical / Physical change
In a lab you test the properties of a substance. The substance is a solid, with
a dull appearance. It does not conduct electricity but will dissolve in water.
When hit with a hammer it shatters into pieces. Which structure would you
predict this substance to have?
Answer: Glass or plastic
Explanation:
Because they both are able to shatter hehehhe ;)))))))
What are the four possible sub levels an electron can occupy?
Four possible sub levels an electron can occupy are s, p, d, f
A level that is lower than or subordinate to another level called as sublevel and electron fill principal energy level or shell to have lowest possible energy and within the shell they also fill the sublevel are s,p,d,f to have the lowest energy and so electron in orbital in the s sublevel called s orbital and have less energy than those in p sublevel and the s sublevel has just one orbital and so can contain 2 electron maximum and the p sublevel has 3 orbital and so can it contain 6 electron maximum and in d 5 orbital and it contain 10 electron and f has 7 orbital and it contain 14 electron maximum
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How many grams of calcium are in 3.01 x 1022 atoms of calcium?
The amount, in grams, of calcium that are in 3.01 x [tex]10^{22[/tex] atoms of calcium would be 1.9992 grams.
Avogadro's numberAccording to the rules, 1 mole of any substance contains Avogadro's number, which is 6.022 x [tex]10^{23[/tex] atoms or molecules.
Now, we have a substance with 3.01 x [tex]10^{22[/tex] atoms of calcium.
If, 1 mole = 6.022 x [tex]10^{23[/tex] atoms
Then, 3.01 x [tex]10^{22[/tex] atoms = 3.01 x [tex]10^{22[/tex]/ 6.022 x [tex]10^{23[/tex]
= 3.01/60.22
= 0.04998 moles
Recall that:
Mole = mass/molar mass
The molar mass of the calcium atom is 40 g/mol.
Thus, the mass of 0.04998 mole of calcium = mole x molar mass
= 0.04998 x 40
= 1.9992 grams
In other words, 3.01 x [tex]10^{22[/tex] atoms of calcium would weigh 1.9992 grams of ca.
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Of the following, a 0.1 M aqueous solution of ________ will have the lowest freezing point
Answer:
2
Explanation:
What is the pH of a solution that has [H3O+] = 6.0 x 10-³ M?
Answer:
2.2
Explanation:
Three moles of helium gas have a volume of 15.0 L. When heated to 30.0 °C at constant pressure, it has a volume of 40.0 L. Determine its initial temperature.
The initial temperature of the helium gas at a constant pressure is 113.63K.
How to calculate temperature?The temperature of an ideal gas can be calculated using the Charles law equation as follows;
V₁/T₁ = V₂T₂
Where;
V₁ = initial volumeT₁ =initial temperature V₂ = final volumeT₂ = final temperatureAccording to this question, three moles of helium gas have a volume of 15.0 L. When heated to 30.0 °C at constant pressure, it has a volume of 40.0 L. The initial temperature cane be calculated as follows:
15/T = 40/303
40T = 4545
T = 113.63K
Therefore, 113.63K is the initial temperature of the helium gas.
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