At a chemical synapse, the intensity of the stimulus is coded by _______.

Answer:

Percentage yield=79.14%

Explanation:

Percentage yield=(Actual yield/theoretical yield)*100

Percentage yield=27.7g/35.0g*100

Percentage yield=79.14%

Answer: Because most electrical wires have an outer coating so you don't get electrocuted when you touch them. You could ask why don't you get electrocuted when you touch a phone charger, same answer, same outer coating.

Answer:

The copper in electrical wires is a great conductor, and birds are not great conductors. So the energy will just bypass the birds and keeps moving along the wire.

Explanation:

Therefore, Kb for the weak base solution R2NH is 4.5 x \(10^{-10.\)

Use the Henderson-Hasselbalch equation, which relates the pH of a buffer solution to the pKa of the weak acid and the ratio of the concentrations of the weak acid and its conjugate base.

First, we need to determine the concentration of the weak base, R2NH, before the addition of HCl. We can use the equation:

Kb = Kw / Ka

here Kw is the ion product constant of water (1.0 x 10^-14) and Ka is the acid dissociation constant of the conjugate acid of the weak base. Since the weak base is unknown, we need to use the given pH to calculate the pKa and then use that to find Ka.

pH = pKa + log([A-]/[HA])

where [A-] is the concentration of the conjugate base (R2N-) and [HA] is the concentration of the weak acid (R2NH).

We can rearrange this equation to solve for pKa:

pKa = pH - log([A-]/[HA])

Substituting the given values, we get:

11.10 = pKa + log([R2N-]/[R2NH])

We can then solve for pKa:

pKa = 11.10 - log([R2N-]/[R2NH])

Now that we know the pKa, we can find Ka:

Next, we need to determine the concentration of the weak base after the addition of HCl. We can use the equation:

moles of HCl = moles of R2NH

0.0030 mol HCl = (100/1000) L x (0.10 mol R2NH/L - [R2NH])

Solving for [R2NH], we get:

[R2NH] = 0.099 - (0.0030/0.1) = 0.069 M

Finally, we can use the equation for Kb:

Kb = Kw / Ka = \(1.0 * 10^{-14} / (2.2 * 10^{-5)\)

= 4.5 x  \(10^{-10.\)

Learn more about solution Visit: brainly.com/question/23946616

#SPJ4

The amount of water that should be added to 28 ml of 15​% alcohol solution to reduce the concentration to ​14% is: 2 ml

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the volume of the diluted solution (v2) we get:

c1 * v1 = c2 * v2

v2 = (c1 * v1)/ c2

v2 = (15% * 28 ml)/ 14%

v2= 30 ml

In order to know how much water should be added we have to subtract 28 ml from the volume of the diluted solution:

amount of water should be added = v2 - v1

amount of water should be added = 30 ml - 28 ml

amount of water should be added = 2 ml

In chemistry a solution is known as a homogeneous mixture of two or more components called:

Learn more about chemical solution at: brainly.com/question/13182946

#SPJ4

Answer: Carbon Monoxide.

Lead.

Nitrogen Oxides.

Ozone.

Particulate Matter.

Sulfur Dioxide.

Other Air Pollutants.

Explanation:

Answer:

I think It is an organism

Answer:

I think it is: an organism

Explanation:

NH₃ has only two non-binding pairs (lone pairs) of e⁻ in it's Lewis structure.

••

H—N—H

|

H

Therefore,

C is correct. ✔

The charge on the central metal ion (Fe) in Ca3[Fe(CN)6]2 is 0. The charge of the central metal ion can be calculated using the charges of the other ions present in the compound and the overall charge of the compound.

In Ca3[Fe(CN)6]2, the overall charge of the compound is 0 since it is neutral. The charge of the cyanide ion (CN-) is -1 and there are six of them, so the total charge contributed by the cyanide ions is -6. The charge of the iron ion (Fe) can be calculated using the fact that the compound has a 2- charge overall:

Charge on Ca3[Fe(CN)6]2 = 3(+2) + 2x(charge on Fe) + 6(-1) = 0

Simplifying this expression, we get:

6 + 2x(charge on Fe) - 6 = 0

2x(charge on Fe) = 0

Charge on Fe = 0/2 = 0

Therefore, the charge on the central metal ion (Fe) in Ca3[Fe(CN)6]2 is 0.

Learn more about metal ion here:

https://brainly.com/question/30622164

#SPJ11

Answer:

Yes

Explanation:

Some bacteria is good for you like the bacteria in your digestive system, which helps with breaking down food and keeping you healthy

Answer:

I think it's C. Animals add water vapor to the air through respiration

Explanation:

gram of NO=5

2NO = 2N+O2

2×2.50=x

x=5

The mass of nitrogen monoxide  produced from 2.5 grams of oxygen is 1.875 grams

4NH₃ + 50₂ → 4NO + 6H₂0

The limiting reagent is 0₂ because the least moles of this are used in the reaction.

Therefore, it will determine the amount of product formed.

From the chemical reaction above

10(16) g of 0₂ gives (4×14 + 4×16) g of NO

2.50 g of 0₂ will give ? of NO

cross multiply

mass of NO formed = 2.50 × 120 / 160

mass of NO formed = 300 / 160

mass of NO formed = 1.875 grams

learn more on mass here: https://brainly.com/question/14269180

(a) The balanced chemical equation is -

     NaoH + Hcl - Nacl + H2O

(b)  For the pH before addition of NaoH, we need

pH = log [H+]

     = -log [0.5]

     =-(-0.3)

      =0.3

The pH of the solution before addition of NaoH is 0.3

(c) Mole of NaoH = 0.5 x 10 = 5molar

Mole of Hcl = 0.5 x 20 = 10mili molar

Unreacted moles of Hcl = 10 -5 = 5 moles.

          Total volume = 20 +10 = 30 ml

Molarity = 5 moles / 30ml = 0.166

      pH = -log (0.166) = 0.77

(d) Moles of NaoH = 20 X 0.5 = 10 milli molar.

Therefore, Hcl consumed = 10 milli mole.

pH of water = [H+] = 10^-7 molar.

Learn more about titration at,

https://brainly.com/question/13307013

#SPJ4

Answer:In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction

Explanation:

Answer:

EEEEEeeEEeEEEEEEEeEEEEEEEEEE

Explanation:

e

Answer: No

Explanation:

A periodic table can be defined as the table in which the row of chemical elements are present. All the elements of the row have same number of electron shells.

The arrangement of elements is based on atomic numbers, electron shell model and other chemical properties. The elements are placed in increasing order of atomic number.

This table does not give information about the occurrence of the elements.

Answer:

Wind

Explanation:

Because, The strong wind can be used to turn turbine to generate electricity to light the houses in Bhutan.

Answer:

A molecule's shape strongly affects its physical properties and the way it interacts with other molecules, and plays an important role in the way that biological molecules (proteins, enzymes, DNA, etc.) interact with each other.

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, by rotation of molecule or bond , we can change the shape of molecule.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. To change the shape of your molecular models without breaking any of the covalent bonds is by rotating the molecule or a bond.

Therefore, by rotation of molecule or bond , we can change the shape of molecule.

To learn more about chemical compound, here:

brainly.com/question/26487468

#SPJ2

Answer:

the start codon is tryptophan and also codes fro the amino acid methionine

Answer:

The Eukaryotic cell has a nucleus

Explanation:

Prokaryotic cells lack a nucleus and membrane-bound structures. Eukaryotic cells have a nucleus and membrane-bound structures called organelles.

Combustion reactions require oxygen, a fuel, and give off energy.

Combustion reactions, also known as burning, are chemical reactions that occur when a fuel combines with oxygen in the presence of an ignition source. The main answer to the question is that combustion reactions require all of the mentioned components: oxygen, a fuel, and they give off energy.

Oxygen is a crucial component in combustion reactions because it acts as an oxidizer. It combines with the fuel, which can be any combustible material such as wood, gasoline, or natural gas. The presence of oxygen enables the fuel to undergo oxidation, releasing energy in the form of heat and light.

Without a fuel source, combustion cannot occur. The fuel provides the carbon and hydrogen atoms necessary for the reaction. Different fuels have varying energy content and combustion characteristics, which can affect the intensity and efficiency of the reaction.

When a fuel and oxygen react, a chemical reaction takes place, resulting in the release of energy. This energy is in the form of heat and light, which is why combustion reactions often produce flames. The energy released during combustion can be harnessed for various purposes, such as heating, cooking, or powering engines.

In summary, combustion reactions normally require oxygen as an oxidizer, a fuel source to provide the necessary atoms, and they give off energy in the form of heat and light. These reactions are essential for various practical applications and play a vital role in our daily lives.

Learn more about combustion reactions

brainly.com/question/14335621

#SPJ11

With 0.5 moles of aluminum, 0.75 moles of hydrogen gas would be produced from the reaction.

When aluminum reacts with hydrochloric acid, it produces hydrogen gas (H₂) according to the following balanced chemical equation:

2Al + 6HCl → 2AlCl₃ + 3H₂

To calculate the moles of H₂ gas produced, you need to know the amount (in moles) of aluminum (Al) and hydrochloric acid (HCl) used in the reaction.

Let's assume you have 0.5 moles of aluminum (Al) and an excess amount of hydrochloric acid (HCl).

According to the balanced equation, the stoichiometric ratio between aluminum and hydrogen gas is 2:3. This means that for every 2 moles of aluminum, 3 moles of hydrogen gas are produced. Therefore, we can calculate the moles of hydrogen gas using the stoichiometric ratio:

0.5 moles Al × (3 moles H₂ / 2 moles Al) = 0.75 moles H₂

Learn more about stoichiometric ratio here:

https://brainly.com/question/28297916

#SPJ11

Density of solution = 1.06 g/mL

Therefore, mass of 875 mL of solution = 875 * 1.06 = 927.5 g

Given mass of NaCl in the solution = 98.6 g

Therefore, the percentage by mass of the solution = (mass of NaCl / mass of solution) × 100= 98.6 / 927.5 × 100 = 10.63 % ≈ 10.6 %

Hence, option d is the correct answer.

An amount of 98.6 g of NaCl is dissolved in enough water to form 875 mL of solution. The mass of the solution is 927.5 g. The percentage by mass of the solution is 10.6 %. Therefore, the correct option is d.

To know more about NaCl visit:

brainly.com/question/14296102

#SPJ11

Answer:

C based on the number 5, which is easy to use  in calculations

Explanation:

The SI unit system is not based on the number 5.

To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

To know more about the Henderson-Hasselbalch equation, click here, https://brainly.com/question/31732200

#SPJ11

Answer:

gravity

Explanation:

Because they both have mass, the two protons exert gravitational attraction on each other. Because they both have a positive electric charge, they both exert electromagnetic repulsion on each other.

Answer:

See explanation

Explanation:

The laboratory provides a controlled environment for scientific studies. In the field, it is more difficult to control extraneous variables. Extraneous variables are other variables which are not the independent variable but could inadvertently affect the dependent variable.

Extraneous variables are better controlled in the secluded environment of a laboratory better than they could be controlled in the field. This makes it more difficult to have control variables in the field than it is to have them in the laboratory. Recall that control variables are variables that must remain unchanged throughout the study.

Answer:

D  86.8%

Explanation:

Two bromines mole wt = 2 * 79.9 = 159.8 gm  (from periodic table)

Mg = 24.3  gm

159.8 / ( 159.8 + 24.3)  = .868 = 86.8 %