Which amino acid is NOT capable using its side chain (R group) to participate in general acid-base catalysis?A) AspB) HisC) SerD) ValE) Lys

Answer:

The Dog

Explanation:

The more mass something has the more kinetic energy it has in it.

Answer:

Its a small dense spherical structure in the nucleus of a cell during interphase.

Based on the given information, we can calculate the percent yield of the reaction using the formula: Percent yield = (Actual yield / Theoretical yield) * 100

First, we need to determine the theoretical yield of carbon dioxide (CO2) based on the stoichiometry of the reaction. The balanced chemical equation for the reaction between acetic acid (CH3COOH) and calcium carbonate (CaCO3) is:
2 CH3COOH + CaCO3 -> Ca(CH3COO)2 + H2O + CO2

The actual yield of CO2 is given as 1.11 g. Now we can calculate the percent yield:

Percent yield = (1.11 g CO2 / 1.086 g CO2) * 100

= 102.2%

The percent yield of the reaction is 102.2%. The percent yield is a measure of the efficiency of a chemical reaction. It compares the actual yield to the theoretical yield and expresses it as a percentage. In this case, the actual yield of CO2 is 1.11 g, while the theoretical yield is calculated to be 1.086 g. By plugging these values into the percent yield formula, we find that the percent yield is 102.2%.

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When 2.47 g of calcium carbonate (CaCO3) is reacted, approximately 0.025 mol of CaCO3 is consumed and 0.025 mol of carbon dioxide (CO2) is produced. The calculated mass of CO2 is approximately 1.1 g, which closely matches the measured mass of 1.11 g.

Based on the given information, we can calculate the molar mass of calcium carbonate (CaCO3) and the number of moles of CO2 produced.

1. To find the molar mass of CaCO3, add the atomic masses of calcium (Ca), carbon (C), and three oxygen (O) atoms:
  - Ca: 40.08 g/mol
  - C: 12.01 g/mol
  - O: 16.00 g/mol
  - Molar mass of CaCO3 = 40.08 g/mol + 12.01 g/mol + (16.00 g/mol x 3)

  - Molar mass of CaCO3  = 100.09 g/mol

2. Use the molar mass to convert the mass of CaCO3 to moles:
  - Moles of CaCO3 = 2.47 g / 100.09 g/mol

  - Moles of CaCO3  ≈ 0.025 mol

3. According to the balanced equation, one mole of CaCO3 produces one mole of CO2.
  Therefore, the number of moles of CO2 produced is also approximately 0.025 mol.

4. To find the mass of CO2 produced, use the molar mass of CO2:
  - C: 12.01 g/mol
  - O: 16.00 g/mol
  - Molar mass of CO2 = 12.01 g/mol + (16.00 g/mol x 2)

  - Molar mass of CO2  = 44.01 g/mol

5. Mass of CO2 produced = moles of CO2 x molar mass of CO2
  - Mass of CO2 = 0.025 mol x 44.01 g/mol

  - Mass of CO2 = 1.1 g

Comparing the calculated mass of CO2 (1.1 g) with the measured mass of CO2 (1.11 g), we can see that they are very close. This suggests that the reaction between acetic acid and calcium carbonate is stoichiometric, meaning the reaction proceeds according to the balanced equation.

In conclusion, when 2.47 g of calcium carbonate (CaCO3) is reacted, approximately 1.11 g of carbon dioxide (CO2) is produced. The stoichiometry of the reaction is confirmed by the close agreement between the calculated and measured masses of CO2.

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Ion selective electrodes are those electrodes that converts  concentration of a specific ion that is present in a solution into electrical potential.

These ion selective electrodes are basically electrochemical sensors that work based on the principle of galvanic cell. The set up of these electrodes generally consists of a reference electrode, ion-selective membrane and a voltmeter.

The transport of ions from a region of higher concentration to a region of lower concentration through the selective membrane creates a potential difference. This potential difference can be measured with respect to a standard reference electrode having a constant electrode potential.

They are used for chloride, potassium, calcium, carbon dioxide/carbonate, oxygen, and a variety of other ions. These methods are particularly well suited for field analysis and also online measurements.

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Answer: Enzymes

Explanation: entzymes are natural catalysts, e.g. Amylase is an enzyme

Answer:

camphor sublimates salt is soluble in water while sand does not sublime and does not dissolve in water you first heat the mixture in a beaker covered with a watch glass camphor will then accumulate on the watch glass then you dissolve the remaining mixture of sand and salt salt will dissolve forming a salt solution then you filter using a filter paper and a beaker the residue on the filter paper is sand while the filtrate is salt solution you then heat the salt solution so that it can evaporate leaving salt particles thus you will have obtained salt sand and camphor

C. If  blood pressure decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises blood pressure.

The maintenance of blood pressure is defined as the high use of sodium in your diet and the low use of potassium in your diet can cause hypertension. It is also important to use those foods which are free from fats. It is also important that we should use fruits, vegetables, and grains in excessive amounts for the maintenance of blood pressure and for a healthy diet.

High blood pressure 190/110 mm Hg can cause the main vital organs of the body like the brain, heart, and kidney too. There are three factors that contribute to blood pressure which are resistance, blood viscosity, and blood vessel diameter.

So we can conclude that blood pressure is the pressure of circulating blood against the walls of the blood vessels.

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Which of the following statements are true of the maintenance

of blood pressure (BP)? (Read carefully and select all of the correct statements.)

A. Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.

B. Aldosterone stimulates the reabsorption of Na+ ions by the kidneys, which lowers BP.

C. If BP decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.

E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.

F. The hormone ANP increases the excretion of K+ ions by the kidneys, which helps conserve water and raise BP.

G. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.

H. The elasticity of the large arteries helps decrease diastolic BP.

Answer:

Do not try to re-light or handle malfunctioning fireworks. Soak both spent and unused fireworks in water for a few hours before discarding.

Answer:

A.1

Explanation:

The coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.

Methods to balance the chemical equation -:

The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.

The coefficients in front of the formulas to show how many molecules of that material are used or produced.

Hence, the coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

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At 500 K, the equilibrium constant (Kc) for the reaction: N2O4(g) ⇌ 2NO2(g) is 0.470.The initial concentration of N2O4 is given as 0.0550 M.

Let x be the concentration of N2O4 that dissociates into NO2. The equilibrium concentration of N2O4 would then be (0.0550-x) M. The equilibrium concentration of NO2 would be 2x M. As per the expression of Kc, we can write: Kc = [NO2]^2/[N2O4] = 0.470 Substituting the respective values:0.470 = (2x)^2/(0.0550-x) Rearranging the equation, we get: 4x^2 = 0.02585 - 0.47x4x^2 + 0.47x - 0.02585 = 0 Solving the quadratic equation, we get: x = 0.00626 M Thus, at equilibrium, the concentration of N2O4 would be (0.0550-0.00626) M = 0.0487 M The concentration of NO2 would be 2*0.00626 M = 0.0125 M

In summary, The equilibrium concentrations of N2O4 and NO2 at 500 K would be 0.0487 M and 0.0125 M respectively, expressed in moles per liter to three significant figures and separated by a comma.

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The equilibrium concentrations of N2O4 and NO2 are 0.0350 M and 0.0400 M.

The equilibrium concentrations of N2O4 and NO2 can be calculated using the following equilibrium equation:

N2O4 (g) ⇌ 2NO2 (g)

The equilibrium constant expression for this reaction is

:Kc = [NO2]^2 / [N2O4]

At equilibrium, the concentration of N2O4 will be decreased and the concentration of NO2 will be increased until the equilibrium constant is satisfied. Let x be the change in concentration of N2O4 and 2x be the change in concentration of NO2.

Then, the equilibrium concentrations of N2O4 and NO2 can be expressed as:[N2O4] = (0.0550 - x) M

[NO2] = 2x M

The equilibrium constant for the reaction at 500 K is 4.63.

Substituting the equilibrium concentrations into the equilibrium constant expression and solving for x, we get:

4.63 = (2x)^2 / (0.0550 - x)x = 0.0200 M

Therefore, the equilibrium concentrations of N2O4 and NO2 at 500 K are:

[N2O4] = (0.0550 - 0.0200) M = 0.0350 M

[NO2] = 2(0.0200) M = 0.0400 M

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Increasing the permeability of the membrane to sodium ions (Na+) will immediately depolarize the resting membrane potential of a typical neuron.

Resting membrane potential is maintained by the unequal distribution of ions across the cell membrane, primarily sodium (Na+), potassium (K+), and chloride (Cl-) ions. At rest, a neuron has a higher concentration of Na+ ions outside and K+ ions inside the cell. The resting membrane potential is primarily determined by the K+ ions due to higher permeability of the membrane to K+.

Depolarization occurs when there is an influx of Na+ ions into the neuron, causing the membrane potential to become more positive. By increasing the permeability of the membrane to Na+ ions, you allow more Na+ ions to enter the neuron, leading to immediate depolarization of the resting membrane potential.

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Answer:

Gas

Explanation:

In a gas, particles are in consistent straight-line movement. The motor energy of the atom is more prominent than the alluring power between them, hence they are a lot farther separated and move unreservedly of one another.

Answer:  Gases only

Explanation: because there are gas all around us. You can walk though the air with slamming into it like its a brick wall. that's because the particles are far apart allowing it to move freely.

Hopefully this helps.

Answer:

E

Explanation:

equal number of protons and different number of atomic masses/neutrons

The 95% confidence interval estimate for the mean wake time with the drug treatment is between 76.6 min and 89.6 min.

The 95% confidence interval estimate is calculated based on the sample mean and the standard deviation. In this case, the sample mean wake time after treatment is 83.1 min, and the standard deviation is 20.7 min. With these values, we can construct the confidence interval estimate.

The formula for calculating the confidence interval estimate is:

CI = sample mean ± (critical value * standard deviation / square root of sample size)

Using a 95% confidence level, the critical value is 1.96. The sample size in this case is 21.

Plugging in the values:

CI = 83.1 ± (1.96 * 20.7 / √21)

Simplifying the equation:

CI = 83.1 ± 8.08

Therefore, the 95% confidence interval estimate for the mean wake time with the drug treatment is between 76.6 min (83.1 - 8.08) and 89.6 min (83.1 + 8.08).

This result suggests that the mean wake time before the treatment, which was 105.0 min, is outside the confidence interval estimate. The confidence interval estimate does not include the value of 105.0 min, indicating that the mean wake time with the drug treatment is significantly different from the mean wake time before the treatment.

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A subshell which is 100% full or 50% full is more stable than subshells which are partially filled with a number of electrons less than or greater than half the number of electrons which can be held by the subshell.

Explanation:

Answer:

          i)  Neon (Ne)

           ii)  Fluoride Ion (F⁻¹)

            iii)  Oxide Ion  (O⁻²)

Explanation:

                  Ions are those charged species which are either positively charged (by loosing electrons) called as cations or negatively charged (by gaining electrons) called as anions.

                 In given examples, Neon is a neutral atom which has an atomic number 10. It contains 10 electrons in its neutral state with the electronic configuration 1s², 2s², 2p⁶.

                 Fluorine atom has an atomic number of 9. Therefore, it contains 9 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁵. When Fluorine atom gains one electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶.

                Oxygen atom has an atomic number of 8. Therefore, it contains 8 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁴. When Oxygen atom gains two electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶ forming an Oxide Ion.

Answer:

no, amu of carbon is 12 . if it changes the element will change

An  ion channel gate must change conformation every time each ion passes through it ---- False.

Ions can move from one side of the cell membrane to the other through ion channels, which are protein molecules that span the membrane. After a conformational change in the structure of the protein that opens the ion channel, they have an aqueous pore that is accessible to ions.

The passive movement of ions through cell lipid bilayers and down an electrochemical gradient is made easier by ion channels. This peculiarity is fundamental forever, and underlies numerous basic homeostatic cycles in cells.

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To make 1 liter of a 10% NaCl solution from a solid stock, you will require the following materials and containers.MaterialsSolid NaClDistilled water1-Liter volumetric flask250-mL volumetric flask 2-beakersProcedureTo prepare 1 liter of a 10% NaCl solution, the following procedure should be followed:Measure out 100g of NaCl using a balance.

Measure the weight of an empty 250-mL volumetric flask.Add the NaCl to a 250-mL beaker and add a small amount of distilled water to it to dissolve the NaCl.Carefully pour the dissolved NaCl solution into the 250-mL volumetric flask. Add distilled water to the mark on the flask to make up the volume. Stopper the flask and invert it several times to mix the solution.Measure the weight of the 1-Liter volumetric flask.Add the 250-mL volumetric flask solution to a 1-Liter volumetric flask.Add distilled water to the mark on the flask to make up the volume.

Stopper the flask and invert it several times to mix the solution.The final volume of the solution will be 1 liter of a 10% NaCl solution.PrecautionsEnsure the NaCl has completely dissolved before adding more water to avoid making a less concentrated solution.Measure the weight of the volumetric flask before and after adding the solution to calculate the volume of solution that was added.Use distilled water to prepare the solution.

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Boimler and Rutherford convince the Ferengis not to poach Mugatos by appealing to their sense of profit and offering a more lucrative alternative.


Step 1: Boimler and Rutherford engage in a conversation with the Ferengis and learn about their motivation for poaching Mugatos, which is primarily financial gain.
Step 2: They research and analyze the potential profit of poaching Mugatos and the potential consequences or risks associated with it, such as legal penalties or environmental damage.
Step 3: Boimler and Rutherford propose a more profitable and sustainable alternative for the Ferengis to consider, such as breeding and conserving Mugatos for a wildlife sanctuary or ecotourism business.
Step 4: They present their proposal to the Ferengis, outlining the financial benefits, reduced risks, and long-term sustainability of their alternative plan.
Step 5: The Ferengis, driven by their desire for profit, agree to abandon their poaching activities and pursue the more lucrative option proposed by Boimler and Rutherford.

Boimler and Rutherford manage to convince the Ferengis not to poach Mugatos by understanding their motivation for profit and presenting a more profitable and sustainable alternative. This solution not only protects the Mugatos but also benefits the Ferengis in the long run, showing that a collaborative approach can lead to a win-win situation for all parties involved.

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All alkali metals are in the +1 oxidation state when they ionise. For instance, sodium (Na) loses an electron to generate Na+ with an oxidation state of +1 when it combines with chlorine (Cl) to form sodium chloride (NaCl), whereas Cl acquires an electron to become Cl- with an oxidation state of -1.

Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) are examples of alkali metals. These extremely reactive metals easily shed their outermost electron to create a cation with a positive charge. An element's oxidation state, commonly referred to as the oxidation number, is a measurement of how many electrons the element has received or lost as it transforms into a compound or ion.

Alkali metals typically lose their one valence electron to create a cation with a positive charge because they have one valence electron in their outermost shell.

Although less frequent and less stable than their +1 oxidation state, some alkali metals, including potassium and cesium, can form cations with a +2 oxidation state under specific circumstances. Alkali metals tend to shed their outermost electron to form a cation with a +1 oxidation state and are often very reactive.

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All isotopes of the same element have the same number of protons, which defines the element itself.

Different isotopes can exist depending on the neutron count. Because electrons are negatively charged and counterbalance the positive charge of protons, they are present in equal numbers in neutral atoms of the same element. Protons and neutrons are added to form the mass number, which varies between isotopes. An isotope's mass can differ between different isotopes since it depends on its mass number and the masses of the particles that make it up. The masses of various isotopes of the same element are, however, extremely close and can be challenging to distinguish without specialized tools.

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Answer:

Explanation:

The formation of the silvery lining is an example of a distinct color change (b). A distinct color change is an indicator of a chemical change because it indicates a change in the composition of the material, which is caused by a chemical reaction.

The molarity of the sulfuric acid solution is approximately 0.0113 M.

To determine the molarity of the solution, we need to convert the given information into the appropriate units and use the definition of molarity.

First, let's convert the density to kilograms per liter (kg/L). We know that 1 g/ml is equivalent to 1 kg/L. Therefore, the density of the solution is 1.1094 kg/L.

Next, we need to find the molar mass of sulfuric acid (\(H_2SO_4\)). The molar mass of hydrogen (H) is approximately 1 g/mol, the molar mass of sulfur (S) is approximately 32 g/mol, and the molar mass of oxygen (O) is approximately 16 g/mol. Adding them up, we get:

2(1 g/mol) + 32 g/mol + 4(16 g/mol) = 98 g/mol

Now, we can use the definition of molarity, which is moles of solute divided by the volume of the solution in liters. The molarity (M) is given by:

M = (moles of solute) / (volume of solution in liters)

To find the molarity, we need the moles of solute. We can calculate the moles of sulfuric acid using the mass of the solution and its molar mass. The mass of the solution is given as 16.0 y (where "y" represents the symbol for years), but we don't have the density of water in this solution.

Assuming the density of water is approximately 1 g/ml, we can estimate the mass of the solution as 16.0 kg (since 1 ml of water is approximately 1 g). Therefore, the moles of sulfuric acid (\(H_2SO_4\)) can be calculated as:

moles = (mass of solute) / (molar mass of \(H_2SO_4\))

= 16.0 kg / 98 g/mol

= 0.1633 mol

Now we have the moles of solute (sulfuric acid) and the volume of the solution (density). We can rearrange the molarity equation and solve for the volume of the solution:

M = (0.1633 mol) / V

V = (0.1633 mol) / M

Since the density of the solution is given as 1.1094 kg/L, we can assume that the volume of the solution (V) is equal to the mass of the solution divided by its density:

V = 16.0 kg / 1.1094 kg/L

V = 14.434 L

Finally, substituting the values into the rearranged equation for V, we can solve for the molarity:

M = (0.1633 mol) / (14.434 L)

M ≈ 0.0113 M

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Ideal gas law states

V is volume (L), P is pressure (atm), R is universal gas constant: 0.0821 L·atm/mol· K, n is number of moles, T is temperature in Kelvin

Here given:

\(\blacksquare\) mass of O₂ : 100 gram

\(\blacksquare\) moles: mass/molar mass = 100/32 = 3.125 moles

\(\blacksquare\)  25.0 °C = (25+273.15) = 298.15 K

\(\blacksquare\)  pressure: 1.25 atm

Volume:

\(\boxed{\sf V=\dfrac{nRT}{P}}\)

\(\Rightarrow \sf V=\dfrac{(3.125 \ x \ 0.0821 \ x \ 298.15 )}{1.25}\)

\(\Rightarrow \sf V=61.195 \ L\)

\(\Rightarrow \sf V=61.2 \ L \ \ \ (rounded \ to \ nearest \ tenth)\)

Additional Explanation:

In Liters: 61.2 Liters

In cubic meter: 0.061163 m³

In cubic centimeter: 61,163.5 cm³

Answer:

true

Explanation:

Answer:

true AND SOMETHING HAPPENDED TO MI OTHER ACCOUNT

Explanation:

Explanation:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. ... The atom that loses the electrons becomes a positively charged ion (cation), while the one that gains them becomes a negatively charged ion (anion).

Answer:

I think it's fungus or plant cell

Answer:

Plant cell

Explanation:

Chloroplast are only found in plant cells