The pancreas releases _________ to buffer the ph of the stomach juices. a strong base to counter the strong acid pepsin nahco3 hcl atpase activating protein

Answer:

The Aufbau Principle

Explanation:

In the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels.

Answer:

Aufbau principle

Explanation:

edge 2021

You should dilute the 25 mL of 13 M HCl solution to volume of approximately 541.7 mL to obtain a 0.600 M HCl solution.

To obtain a 0.600 M HCl solution from a 13 M stock HCl solution, you will need to dilute the stock solution by a factor of 21.67. This means that you will need to add 21.67 times the volume of the stock solution in order to obtain the desired concentration.

To calculate the volume of stock solution needed, you can use the formula:

(Volume of stock solution) x (Molarity of stock solution) = (Volume of diluted solution) x (Molarity of diluted solution)

Plugging in the given values, we get:

(25 mL) x (13 M) = (Volume of diluted solution) x (0.600 M)

Solving for the volume of diluted solution, we get:

Volume of diluted solution = (25 mL) x (13 M) / (0.600 M) = 541.7 mL

Therefore, you will need to dilute the 25 mL of 13 M stock HCl solution to a final volume of 541.7 mL in order to obtain a 0.600 M HCl solution.

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Answer:

22.08 L

Explanation:

I got it right

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

The  percentage abundance of Mass of N-14 is 99.6 % while the percentage abundance of N-15 is 0.4%.

We know that an element is composed of several isotopes. The isotopes of an element has the same atomic number but different mass numbers. The reason for the difference in the mass number of the elements is the fact that the elements do not have the same number of neutrons.

Now we have the following information;

Mass of  N-14 = 14.0031 amu

Mass of  N-15 = 15.001 amu

Atomic mass of nitrogen = 14.00674 amu

Let the percentage abundance of Mass of  N-14 be x and the percentage abundance of N-15 be 1 - x

We now have;

14.00674 =  14.0031x + 15.001(1 - x)

14.00674 =  14.0031x + 15.001 - 15.001x

14.00674 -  15.001 =  14.0031x - 15.001x

-0.9943 = -0.9979x

x = 0.996

Hence;

percentage abundance of Mass of  N-14 =0.996  or 99.6 %

percentage abundance of N-15 = 1 - 0.996 = 0.004 or 0.4%

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A chemical property is similar to an intensive physical property in that both are properties of a substance that do not depend on the amount of the substance present.

An intensive physical property is a property that is independent of the amount of material, such as its melting point or boiling point.

A chemical property, on the other hand, is a property that describes how a substance reacts with other substances, such as its flammability or reactivity. In addition, chemical properties are often related to the structure of a substance, whereas intensive physical properties are not.

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i) Metals: A and D

Non-metals: B and C

ii) The valency of A is 1. This is because A has one valence electron, and elements in Group 1 (such as A) typically have a valency of 1 as they tend to lose that single valence electron to achieve a stable electron configuration.

iii)

A: Sodium (Na) - Symbol: Na

B: Chlorine (Cl) - Symbol: Cl

C: Oxygen (O) - Symbol: O

D: Calcium (Ca) - Symbol: Ca

iv) The compound formed by the combination of A and B: Sodium Chloride (NaCl) The compound formed by the combination of C and B: Oxygen Chloride (OCl2)

v) Element D (Calcium) is more active than element A (Sodium). This is because elements in Group 2 (such as D) tend to lose two valence electrons, which requires less energy compared to losing only one valence electron (as in the case of A).

vi) The elements that can lose the valence electron to become stable are A (Sodium) and D (Calcium).

Metals: A, B, C, D; Non-metals: None. Elementsii) The valency of A is 1 because it has only one valence electron.iii) The name and symbol of all the elements are:A - Sodium (Na)B - Chlorine (Cl)C - Argon (Ar)D - Calcium (Ca)iv) The molecular formula of the compound formed by the combination of A and B is NaCl. The molecular formula of the compound formed by the combination of C and B is BCl2.

v) A is more active than D because A is a metal and metals are more active than non-metals. A tends to lose electrons more easily than vi) The elements which can lose the valence electron to become stable are metals.

i) Metals: A and D Non-metals: B and C ii) The valency of A is 1. This is because A has one valence electron, and elements in Group 1 (such as A) typically have a valency of 1 as they tend to lose that single valence electron to achieve a stable electron configuration. iii) A: Sodium (Na) - Symbol: Na B: Chlorine (Cl) - Symbol: Cl C: Oxygen (O) - Symbol: O D: Calcium (Ca) - Symbol: Ca

iv) The compound formed by the combination of A and B: Sodium Chloride (NaCl) The compound formed by the combination of C and B: Oxygen Chloride (OCl2) v) Element D (Calcium) is more active than element A (Sodium). This is because elements in Group 2 (such as D) tend to lose two valence electrons, which requires less energy compared to losing only one valence electron (as in the case of A). vi) The elements that can lose the valence electron to become stable are A (Sodium) and D (Calcium).

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Phosphorus-33 has 18 neutrons.

To find the number of neutrons, you subtract the atomic number (which is the same as the number of protons) from the mass number. Phosphorus-33 has a mass number of 33, so:

neutrons = mass number - atomic number

neutrons = 33 - 15

neutrons = 18

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Answer:

Ethyne is a colourless gas with a characteristic smell. It has a melting point -81oC. It has a boiling point -84oC.

Explanation:

An electric potential field that grows in the positive x-direction will cause an at-rest negatively charged particle to accelerate in that direction.

Around a charged item, the electric field acts as a "force field" to show in which direction an imaginary positively charged particle would be pushed by the electric force. It also demonstrates how powerful of a shove the electric force would provide.

The difference between two points in an electric field in terms of potential energy per unit charge is known as the electric potential, also known as voltage. 

We are aware that, if we move the particle to a specific location, the electrical potential energy will change depending on the amount of charge we are pushing or pulling, as well as whether it is positive or negative. To measure the electrical potential at any given site, physicists utilise a single positive charge as our model charge.

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Answer: yes

Explanation:

Answer:

yes

Explanation:

due to the properties of baron she should be fine

Answer:

By making sense of the World around them

Explanation:

maybe?

Answer:

C: salt is dissolved into freshwater

D: salt is dissolved into freshwater

F: frying changes the color and texture of an egg

G: ocean water evaporates to water vapor on a hot day

The reaction of calcite in limestone slowly dissolving over time in the presence of slightly acid water creates calcium ions \((Ca_2^+)\) and bicarbonate ions \((HCO_3^-)\).

Calcite is a mineral that is the primary component of limestone. When limestone comes into contact with slightly acid water, such as water containing carbon dioxide \((CO_2)\) or weak acids, it undergoes a chemical reaction known as dissolution. In this reaction, the calcite in limestone reacts with the acid to form soluble calcium ions \((Ca_2^+)\) and bicarbonate ions \((HCO_3^-)\). The dissolution of calcite leads to the gradual breakdown or erosion of the limestone structure over time.

This process is an example of chemical weathering, where the interaction between water and minerals in rocks results in their gradual breakdown and alteration. The release of calcium and bicarbonate ions into the water can have implications for the composition of the water and its potential to contribute to the formation of features such as caves or sinkholes in limestone-rich areas.

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Answer:

a

barium

b

calcium

e

aluminum

f

magnesium

g

copper

Forms cation

Explanation:

Answer:

Explanation:

The net ionic equation is essentially the most simplified version of a reaction with only the reactants that form the precipitate (the solid). Due to this it is extremely important to properly write your ionic equation first. In your total ionic equation, you forgot to balance the compounds with 2- charges.  The coefficients in your equation is due to the 2- charge of sulfate and 2+  charge of Strontium. Additionally, precipitates are solid which means they do not dissociate. SrSO4 will stay together while KBR which are both spectator ions will dissociate leaving you with the ionic equation below.

Total Ionic Equation: Sr^2 (aq)+  + 2Br ^1- (aq) +2K ^ 1(aq) +  SO4 ^2- (aq) --> SrSO4 (s) + 2K^1+ (aq) + 2Br^1- (aq)

The coefficient of 2 on both K and Br in the products is to ensure that the equation is balanced and that for your net ionic equation, all spectator ions cancel. When you cancel all of the ions that dissociate you are left with the essence of the reaction:

Net Ionic Equation:  Sr^2 (aq) + SO4 ^2- (aq) --> SrSO4 (s)

The value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

The expression for calculating 8D of water vapor in isotopic equilibrium with fresh water can be given by: 8D = α 8D (vapor) + (1 - α) 8D (liquid). Where,α is a fractionation factor and 8D (vapor) and 8D (liquid) are the deuterium enrichments in water vapor and liquid, respectively.

The value of α is given by:a (liquid-vapor) = 1.090So,α = (a (liquid-vapor) - 1) / (a (liquid-vapor) + 1)α = (1.090 - 1) / (1.090 + 1)α = 0.045So,8D = α 8D (vapor) + (1 - α) 8D (liquid)Given,8D (liquid) = -65‰ (‰ denotes permil, which is equal to parts per thousand)

Substitute the given values in the expression and simplify:8D = 0.045 × 8D (vapor) + (1 - 0.045) × (-65)8D = 0.045 × 8D (vapor) - 61.9258D + 2.79125 = 8D (vapor)

Therefore,8D (vapor) = 8D - 2.79125= -65 - 2.79125= -67.79125‰ (answer)Therefore, the value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.

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Answer:

This is because their is a repulsive force between the magnetic north and the geographical north since the rod experiences the Earth's magnetic field.

The iron rod deflects at an angle (angle of dip) from the horizontal.

Visible light and radio waves are both examples of electromagnetic radiation, which has a dual nature, possessing the properties of both particles and waves.

Electromagnetic radiation (EM radiation) is a type of energy that is produced by the movement of electrically charged particles traveling through space or matter. Electromagnetic radiation is a type of radiation that includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma radiation. It's an oscillating electric and magnetic field that propagates through space at the speed of light.

Electromagnetic radiation exhibits the characteristics of both a particle and a wave. The wave nature of electromagnetic radiation can be characterized by its frequency, wavelength, and amplitude. The frequency of a wave is the number of oscillations per second, which is measured in hertz (Hz). The wavelength of a wave is the distance between two consecutive peaks or troughs, which is measured in meters (m). The amplitude of a wave is the height of its crest or trough, which is measured in units of power, such as watts (W).

The particle nature of electromagnetic radiation can be characterized by its energy and momentum. Electromagnetic radiation consists of particles known as photons, which are massless and travel at the speed of light.  The energy of a photon is proportional to its frequency, and its momentum is proportional to its wavelength.

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The solubility of NH4Cl at 80.0 °C is approximately 150 g/100 mL.

To calculate the solubility of NH4Cl at 80.0 °C using the NH4Cl solubility curve, we need to follow the steps below:

Step 1:

Draw a line from the temperature point of 80.0 °C to the solubility curve.

Step 2:

Draw a horizontal line from the endpoint of the line drawn in step 1 to the y-axis.

Step 3:

Read off the solubility value from the y-axis.

The solubility of NH4Cl at 80.0 °C can be calculated as follows:

Step 1:

Draw a line from the temperature point of 80.0 °C to the solubility curve

Step 2:

Draw a horizontal line from the endpoint of the line drawn in step 1 to the y-axis.

Step 3:

Read off the solubility value from the y-axis.

The solubility of NH4Cl at 80.0 °C is approximately 150 g/100 mL.

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Without a specific solubility curve for NH4Cl, one would determine the solubility at 80.0 ºC by locating 80.0 ºC on the temperature axis, moving upwards to intersect the curve, then across to the solubility axis.

To calculate the solubility of NH4Cl at 80.0 ºC, one would need to consult the specific solubility curve for NH4Cl. But, without a specific figure or data, I can't provide a numerical value for the solubility of NH4Cl at 80.0 ºC. However, the process would involve finding 80.0 ºC on the x-axis (temperature axis) of the curve and then moving up to meet the curve. From that point, you would move horizontally to meet the y-axis (solubility axis), the value there would be the solubility of NH4Cl at 80.0 ºC.

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The pressure in a 12.2 L vessel that contains 2.34 g of carbon dioxide, 1.73 g of sulfur dioxide, and 3.33 g of argon, all at 42 °C is A) 263 mmHg

To solve this problem, we need to use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to calculate the number of moles of each gas:

nCO2 = 2.34 g / 44.01 g/mol = 0.053 mol
nSO2 = 1.73 g / 64.06 g/mol = 0.027 mol
nAr = 3.33 g / 39.95 g/mol = 0.083 mol

Next, we need to calculate the total number of moles:

ntotal = nCO2 + nSO2 + nAr = 0.053 mol + 0.027 mol + 0.083 mol = 0.163 mol

Now, we can use the ideal gas law to solve for the pressure:

P = ntotalRT / V

where R = 0.0821 L•atm/mol•K is the gas constant.

We need to convert the temperature to Kelvin:

T = 42 °C + 273.15 = 315.15 K

Plugging in the values, we get:

P = (0.163 mol)(0.0821 L•atm/mol•K)(315.15 K) / 12.2 L = 0.345 atm

Finally, we need to convert the pressure to mmHg:

1 atm = 760 mmHg

P = 0.345 atm × 760 mmHg/atm = 262.2 mmHg

Therefore, the answer is A) 263 mmHg (rounded to the nearest whole number).

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In a physical change, the substance's shape or appearance changes, but the type of matter it contains stays the same. But when matter undergoes a chemical change, at least one new substance with novel properties is created.

Chemical synthesis, or, alternatively, chemical decomposition into two or more different substances, occurs when one substance reacts with another to create a new substance.

Physical modifications are those that affect a chemical substance's form but not its chemical composition. Physical changes are usually unable to separate compounds into chemical elements or simpler compounds, but they can be used to separate mixtures into their component compounds.

An overview was given as your information is incomplete.

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Answer:

3p6 3d4

Explanation:

3d will come after 3p => 3p 3d

p will hold maximum of 6 electrons while d will hold maximum of 10 electrons.

if there are 8 more electrons to 3p2, then 4 will fill 3p so it will become 3p6

then the other 4 will fill 3d to become 3d4

Answer:

A. Alpha Particle

Explanation:

I think i could be wrong

Explanation:

500 degree Celsius because we can see it in the tube

The pressure of \(N_{2}\) will rise under the given conditions. And, Yes, it is possible to reverse this tendency by adding \(H_{2}\). The minimum pressure of H2 required to reverse the tendency is 0.01 atm.

The reaction involved is: \(N_{2}\)(g) + 3\(H_{2}\)(g) ⇌ 2\(NH_{3}\)(g)  Hence, when \(H_{2}\) is added to the above system, the \(N_{2}\) and  \(H_{2}\)  will react to produce \(NH_{3}\). This reaction will reduce the amount of \(N_{2}\) present in the system, causing the pressure of \(N_{2}\) to decrease. Therefore, by adding \(H_{2}\)  , we can change the tendency of \(N_{2}\) pressure from rise to fall.To calculate the minimum pressure of  \(H_{2}\)  required to reverse the tendency, we have to use the equilibrium constant, Kp. The expression for Kp for the above reaction is: Kp =( \(NH_{3}\)) / p(\(N_{2}\)) p3( \(H_{2}\) )

At equilibrium, Kp = 1.7 × 104 at 1126 °C.Now, we will solve for the minimum pressure of \(H_{2}\)   needed to reverse the tendency. Let's assume that the pressure of \(N_{2}\) has increased by x atm. Therefore, the new pressure of \(N_{2}\) will be (0.0406 + x) atm. At equilibrium, we have:

p2(\(NH_{3}\) ) / p(\(N_{2}\)) p3( \(H_{2}\) ) = 1.7 × 104

On substituting the given values and simplifying, we get:

p2(\(NH_{3}\)) / p(N2) = 6.39 × 10-5

Now, p2(\(NH_{3}\)) = 5.97 atm, and p(\(N_{2}\)) = (0.0406 + x) atm.

On substituting these values, we get:5.97 / (0.0406 + x) = 6.39 × 10-5

Solving for x, we get:x = 0.00579 atm ≈ 0.01 atm (rounded to 2 significant digits)Therefore, the minimum pressure of \(H_{2}\)   required to reverse the tendency is 0.01 atm.

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Answer:

Catalyst

Explanation:

There are multiple chemical reactions today that occur at a very slow rate and therefore cannot yield the products for a very long time. While physical properties can be implemented inside an experiment to help speed up a process, a substance called a catalyst can help speed up a reaction to produce more \(CaCO_3\) molecules.

A catalyst is a substance that lowers the activation energy of a chemical reaction in order to speed up a chemical reaction. A catalyst does not become consumed during the reaction, and therefore does not disrupt the reaction process of the original.

Every reaction must overgo the activation energy, or the minimum amount of energy needed to start a reaction. However, the activation energy can be a steep hill to climb for the reactants, and can have a hard time producing anything. A catalyst is used here to lower the activation energy and assist in the reaction.

The states of matter of the materials;

1) Dispersion forces - Yes

2) Hydrogen bonding - No

3) Ionic - No

4) Dispersion forces - No

5)  Dispersion forces - Yes

6) Ionic  - No

7) Hydrogen bonding - No

Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.

One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.

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Answer:

−0.60205999

Explanation: