at pH 14, what is the charge on lysine?
(a) -1
(b) +1
(c) -2
(d) +2

Jack's conclusion should be that; Increasing the surface area of antacid increases the rate at which it dissolves in water.

Jack prepared a structured experiment in which the independent variable is the surface area of the antacid and the dependent variable is the time taken for the antacid tablet to dissolve.

The experiment was carefully controlled because the volume of water used, stirring time and temperature were all kept the same for the both systems.

Since the surface area of the antacid in glass 2 is higher than the surface area of the antacid in glass 1 so we can conclude that increasing the surface area of antacid increases the rate at which it dissolves in water.

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Answer: THE ANSWER IS C.) "Increasing the surface area of antacid increases the rate at which it dissolves in water"

Explanation: I JUST TOOK THE 60 QUESTION SCIENCE FINAL EXAM

Answer:

Explanation:

1 atmosphere (standard pressure), 273.15 kelvin (standard temperature)

Answer:

5 Mg (magnesium), 2 N (nitrogen), and 6 O (oxygen) -- total of 13 atoms

There are 45 as 1 mg(NO3)2 = 9 atoms.

To get the bottom of the meniscus to the volumetric line of the pipette, tilt the pipette slowly and gently while keeping the top of the meniscus level. Make certain that you are gazing at the meniscus at eye level. Finally, add or subtract liquid as needed until the bottom of the meniscus reaches the volumetric line.

Follow these steps to get the bottom of the meniscus to the volumetric line of the pipette:

Fill the pipette with the liquid to be measured by dipping the tip of the pipette in the liquid and bringing it up to the required volume.

Hold the pipette upright and gently pour the liquid out until the meniscus (the curved surface of the liquid) is slightly above the pipette's calibration point.

To adjust the meniscus, use a clean and dry dropper to add or withdraw tiny drops of liquid from the pipette until the meniscus's bottom is at the pipette's calibration mark.

To maintain precision, hold the pipette upright during this operation and add or withdraw the liquid drop by drop.

Once the meniscus has reached the calibration point, you can transfer the liquid to the container of your choice or take any necessary measurements.

When correcting the meniscus, precision is essential since even little deviations might lead to erroneous results. It is also critical to use the correct pipette for the liquid being measured and to follow any special instructions or protocols supplied by your laboratory or project.

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Answer:

What is the question needing to be answered?

Explanation:

Usually with a scientific hypothesis, you ask the question in an if, then statement. For example: If it rains outside, then the ground will be wet. It's kind of like a cause and effect statement.

Reagents required to carry out the conversion shown are as  follows :Ch3I/Ag2OCh3OH/Ag2OCh3OH/ Pyridine Ch3CH2OH/HClCh3OH/HCl

The given reactions can be understood through the following diagram.In the first reaction, ch3i/ag2o is used to convert to ch3oh/ag2o. This conversion is a type of nucleophilic substitution in which Ag2O works as an oxidizing agent.In the second reaction, ch3oh/ag2o is used to convert to ch3oh/pyridine.

This conversion is a dehydration reaction in which pyridine works as a catalyst.In the third reaction, ch3oh/pyridine is used to convert to ch3ch2oh/hcl. This conversion is a nucleophilic addition reaction in which HCl works as a catalyst.In the fourth reaction, ch3ch2oh/hcl is used to convert to ch3oh/hcl. This conversion is a dehydration reaction in which HCl works as a catalyst.

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The student's question pertains to various chemical reactions involving different reagents. Depending upon the reaction reagents could take part as acid or base, reducing or oxidizing agent, or nucleophile or electrophile.

The chemical equations provided demonstrate several different reactions requiring specific reagents (chemically active substances). The reactions are:

Each reactant's role can vary, it could act as an acid or base, a reducing or oxidizing agent, or a nucleophile or electrophile, dependingon the other substance(s) present in the reaction.

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A buffer is prepared which contains 0.10 M nitrous acid, HNO2, and 0.12 M sodium nitrite, NaNO2. (Ka=4.5x10-4) Calculate the pH after 0.016 mol of NaOH is added to 1.00 L of the buffer.

A buffer solution is an aqueous mixture of a weak acid and its conjugate base, or vice versa, known more specifically as a pH buffer or hydrogen ion buffer.

When a modest amount of a strong acid or base is applied to it, the pH hardly changes at all. A multitude of chemical applications use buffer solutions to maintain pH at a practically constant value.

Numerous living systems use buffering to control pH in the natural world. For instance, the pH of blood is controlled by the bicarbonate buffering system, and bicarbonate also serves as a buffer in the ocean is an aqueous mixture of a weak acid and its conjugate base, or vice versa, known more specifically as a pH buffer or hydrogen ion buffer.

When a modest amount of a strong acid or base is applied to it, the pH hardly changes at all. A multitude of chemical applications use buffer solutions to maintain pH at a practically constant value.

Numerous living systems use buffering to control pH in the natural world. For instance, the pH of blood is controlled by the bicarbonate buffering system, and bicarbonate also serves as a buffer in the ocean.

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Compound A, with a melting point of 129-130 °C, solubility in NaOH solution and hot water, and prominent IR absorptions at 3300-3600 cm, is likely to be a phenol derivative obtained from natural sources. Phenols are organic compounds that possess a hydroxyl group (-OH) attached to an aromatic ring. The given information suggests the following identification and explanation:

Based on these observations, it can be concluded that Compound A is a phenol derivative obtained from natural sources. Further analysis and characterization techniques, such as NMR spectroscopy and mass spectrometry, can be employed to determine the specific structure and functional groups present in Compound A.

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Answer:

D. 4Al + 3O2→2Al2O3

Answer:

Verdadero.

Explanation:

¡Hola!

En este caso, dado que las propiedades periódicas nos hablan de un comportamiento específico sobre los elementos en la tabla periódica, resulta primeramente necesario recordar que la electornegatividad nos dice que tan fuerte es un elemento para atraer electrones de valencia de otros elementos.

De este modo, inferimos que es verdadero, ya que de hecho la electronegatividad nos define el tipo de enlace, basado en la diferencia de electronegatividades de los elementos enlazados, de acuerdo con la imagen adjunta.

Saludos!

The total pressure of the gas is calculated as 849 mmHg.

The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.

In this case, the partial pressures of hydrogen and water are 789 mmHg and  60 mmHg respectively.

Thus, the total pressure of the gas =  60 mmHg +  789 mmHg = 849 mmHg.

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The outermost electron in the ground state electron configuration of beryllium (Be) has the following quantum numbers:

These quantum numbers represent the energy, angular momentum, orientation, and spin of the electron, respectively.

Quantum numbers can be used to predict the possible location of an electron in an atom. These are four numbers that describe the different properties of electrons.

The four quantum numbers are described below:

Principal quantum number (n)-This quantum number defines the energy level at which an electron is present. It determines the distance from the nucleus of the atom that the electron is located. The smallest value of n is 1 and it increases as we move away from the nucleus.

Angular momentum quantum number (l)-The value of l ranges from 0 to n-1. It determines the shape of the orbital.

Magnetic quantum number (ml)-The possible values of ml are -l to +l. It specifies the orientation of the orbital in space.

Spin quantum number (ms)-The spin quantum number describes the spin orientation of the electron. It can have either of the two values, +1/2 or -1/2.

Be has four electrons in its ground state configuration, with two electrons in the 1s orbital and two electrons in the 2s orbital.

For the outermost electron in the 2s orbital, the values of the quantum numbers can be predicted n = 2 since the 2s orbital is in the second energy level. l = 0 for the s orbital. ml = 0 since there is only one s orbital in each energy level.ms = +1/2 or -1/2.

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Answer:

It's: Speed!

Explanation:

Based on the calculations performed in this experiment, the same mass of a solute with a significantly higher molar mass would have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

Boiling point elevation is a thermodynamic phenomenon that occurs when the boiling point of a solvent (a substance that dissolves a solute to create a solution) is increased by adding another substance, the solute, to it. When a solute is added to a solvent, it lowers the freezing point and raises the boiling point of the solvent, which is known as the boiling point elevation.The formula for boiling point elevation is: ∆Tb = Kbm

Here, ∆Tb is the boiling point elevation, Kb is the molal boiling point elevation constant, and m is the molality of the solution. To understand this, let us take an example: Suppose a solution containing 1.0 mol of sodium chloride (NaCl) is dissolved in 1.0 kg of water. The molality of the solution is 1.0 mol / 1.0 kg = 1.0 m. In addition, the Kb for water is 0.51 °C/molal, which means that the boiling point elevation is 0.51 °C when the molality of the solution is 1.0 mol/kg.So, the boiling point of the solution will be raised by 0.51 °C, which can be calculated using the above formula.Calculation performed in this experiment:Boiling point elevation = ΔTb = Kb . mTherefore, based on the above formula, the boiling point elevation is directly proportional to the molality of the solution, which, in turn, is directly proportional to the number of moles of solute in the solution. Furthermore, the number of moles of solute is proportional to the mass of the solute (in grams) divided by its molar mass (in grams/mol).So, if a solute with a significantly higher molar mass is added to the solvent, it will have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

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Answer:

1280.27 g

Explanation:

Pressure = 22 mmHg / 760 = 0.0289 atm (Converting to atm by dividing by 760)

Volume = 2.7 L

Temperature = 31 ∘C + 273 = 304 K

Mass = ?

Using the ideal gas equation;

PV = nRT

n = RT / PV = 0.0821 * 304 / ( 0.0289 * 2.7)

n = 319.86 mol

Mass = Number of moles * Molar mass

Mass = 319.86  * 4.002602

Mass = 1280.27 g

Answer:

friction

Explanation:

There are 44 grams of carbon contained in one mole of C3H8. Details about mass can be found below.

The mass of a substance can be calculated by multiplying the number of moles of a substance by its molar mass.

According to this question, one mole of propane (C3H8) was given.

Molar mass of C3H8 = 12(3) + 1(8) = 44g/mol

Mass of C3H8 = 44g/mol × 1 = 44g

Therefore, there are 44 grams of carbon contained in one mole of C3H8.

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Answer:

The nervous system operates using an electrochemical process. An electrical charge moves through the neuron itself, and chemicals are used to transmit information between neurons

Answer: The nervous system operates using an electrochemical process. An electrical charge moves through the neuron itself, and chemicals are used to transmit information between neurons

Explanation: i just took the test

Answer:

The inner core is solid by intense pressure of all the layers above it.

Explanation:

The inner core is made up of heavy elements such as iron and nickel. It therefore possesses an unusually high pressure that makes the expanded inner core which arose from effects of high temperature to be nullified.

Thus, we can say that the inner core is solid by intense pressure of all the layers above it.

Answer:

Decomposition

Answer:

C:  \(\frac{6 mol}{2 L}\)

Explanation:

we can use the molarity equation

\(M = \frac{mol}{L}\)

so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:

\(\frac{6 mol}{2 L}\)

Answer:6 mol/2L

Explanation:just took the quiz

Answer:

B

Explanation:

This is the First Law of Thermodynamics which states that energy cannot be created or destroyed.

Answer: c) it moves toward a piece of iron

Explanation:

If one 1 gram of the sugar provides 4 calories of the energy, the calorie content from the sugar in a serving of the cereal that has the 9.20 grams of sugar is 36.8 calories.

The 1 gram of sugar provide = 4 calories

The calories that we are taken from our food gives us the energy.

The amount cereal contains the sugar = 9.20 grams

The calorie content is as follows :

The calorie content in the cereal is = 4 × 9.20 calories

The calorie content in the cereal is = 36.8 calories.

Thus, the amount of the calories in the serving of the cereal of 9.20 grams is the 36.8 calories.

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