how would you prepare 1 l of a 0.0500 m phosphate buffer at ph 7.50 using crystalline na2hpo4 and a solution of 1.0 m hcl?

Ammonia's (NH3) Lewis structure is a straightforward illustration of how the molecule's electrons are distributed.

Ammonia is a gas that has the chemical formula NH3, which is an odourless, strong gas. It is a typical chemical used in industry and the home that has a number of applications, including those for fertiliser, cleaning products, and refrigerants.

A core nitrogen (N) atom is surrounded by three hydrogen (H) atoms in the Lewis structure of NH3. Since hydrogen and nitrogen each have one valence electron and nitrogen has five, the molecule has a total of nine valence electrons.

It's crucial to remember that the Lewis structure just depicts the molecule as a whole; it does not reveal how the molecule actually looks. The nitrogen atom occupies the centre of the trigonal pyramidal structure of NH3, which is surrounded by a triangle of hydrogen atoms. The lone pairs of electrons on the nitrogen and hydrogen atoms repel one another, resulting in this form.

In conclusion, the Lewis structure of NH3 reveals the location of electrons within the molecule and can be used to foretell the molecule's chemical reactivity. Three hydrogen atoms surround the core nitrogen atom in the Lewis structure of NH3, which shows bonds between the atoms as lines.

To know more about ammonia, visit:

https://brainly.com/question/29519032

#SPJ4

The law of conservation of mass applies to the combustion of methane in the sense that the amount of reactants (methane and oxygen) must equate the amount of products (water and carbondioxide).

Law of conservation of mass states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

This means that the mass of reactants and products of a chemical reaction do not change because mass can neither be created nor destroyed.

According to this question, methane undergoes a combustion reaction as follows:

CH₄ + 2O₂ → CO₂ + 2H₂O

In the above chemical reaction, the mass/amount of each element on both sides of the equation equates one another, hence, obeying the law of conservation of mass.

Learn more about conservation of mass at: https://brainly.com/question/13383562

#SPJ1

Answer:

612 K

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T₁) = 306 K

Initial pressure (P₁) = 150 kPa

Final pressure (P₂) = 300 kPa

Volume = 4 L = constant

Final temperature (T₂) =?

Since the volume is constant, the final (i.e the new) temperature of the gas can be obtained as follow:

P₁ / T₁ = P₂ / T₂

150 / 306 = 300 / T₂

Cross multiply

150 × T₂ = 306 × 300

150 × T₂ = 91800

Divide both side by 150

T₂ = 91800 / 150

T₂ = 612 K

Thus, the new temperature of the gas is 612 K

Answer:

Scientists study Earth's interior by studying

seismic waves. Seismic waves are waves of energy that travel

through Earth.

Explanation:

(a) The reaction is endothermic.

(b) The heat is coming from the surroundings.

(c) The heat is absorbed by the reaction.

(a) The reaction is endothermic because the beaker feels cool in your hand. In an endothermic reaction, heat is absorbed from the surroundings, resulting in a decrease in the temperature of the immediate environment.

(b) The heat is coming from the surroundings. As the reaction proceeds, it requires energy in the form of heat, which it absorbs from the surrounding environment.

(c) The heat is going into the reaction. In an endothermic reaction, heat energy is absorbed by the reactants, causing their temperature to increase. This absorption of heat allows the reactants to undergo the chemical reaction and proceed toward the formation of products.

Overall, in an endothermic reaction, the heat is absorbed from the surroundings, causing the beaker to feel cool in your hand. The heat energy is utilized by the reaction to drive the chemical transformation of the reactants into products.

Learn more about the endothermic reaction here: brainly.com/question/28909381
#SPJ11

The speed of the race car in kilometers per minute is approximately 2.66 km/min.

To convert miles per hour to kilometers per hour, we can use the conversion factor;

1 mile = 1.61 kilometers

So, multiplying both sides by 1.61 gives;

1 mile/hour = 1.61 kilometers/hour

Therefore, we can convert 99 miles/hour to kilometers/hour as follows:

99 miles/hour × 1.61 kilometers/mile = 159.39 kilometers/hour

So, the speed of the race car in kilometers per hour is 159.39 km/h.

To convert kilometers per hour to kilometers per minute, we can use the fact that there are 60 minutes in an hour. So;

159.39 kilometers/hour ÷ 60 minutes/hour

= 2.66 kilometers/minute

Therefore, the speed of the car is 2.66 km/min.

To know more about speed here

https://brainly.com/question/17661499

#SPJ1

The volume of the gas will decrease from 20 cm³ to 13.08 cm³.

Boyle's law is a gas law that states that the product of the pressure and volume of a gas is constant at constant temperature.

Assuming no change in temperature is significant because it allows us to apply Boyle's law to solve the problem. If the temperature were to change, we would need to use a different gas law, such as Charles's law or the combined gas law, to account for the change in temperature.

We can use Boyle's law to solve this problem, which states that the product of the pressure and volume of a gas is constant at constant temperature. Mathematically, we can express this as P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, respectively, and P₂ and V₂ are the final pressure and volume, respectively.

Using this equation, we can solve for V₂:

P₁V₁ = P₂V₂

V₂ = (P₁V₁)/P₂

Substituting the given values, we get:

V₂ = (510 mmHg x 20 cm³) / 780 mmHg

V₂ = 13.08 cm³

Therefore, if the pressure is increased from 510 mmHg to 780 mmHg at constant temperature, the volume of the gas will decrease from 20 cm³ to 13.08 cm³.

Learn more about Boyle's law here:

https://brainly.com/question/30367133

#SPJ1

Explanation:

D.the electrons in the wire begin to flow

The element iodine appears in Period 5 of the Periodic Table. This means that an iodine atom has five orbitals in its electron cloud. so the correct option is (b).

As a member of group 7, iodine possesses seven outer electrons. Since it is in the fifth period, its electrons will be in orbitals 5s and 5p. The chemical formula for iodine is 5s25px25py25pz1.

total amount of electrons that could occupy each orbital

Again using iodine as an example, we can observe on the periodic table that it has an atomic number of 53. ( In neutral state it contains 53 electrons). The configuration of the entire electron cloud is 1s22s22p63s23p64s23d104p65s24d105p5.

Iodine is a trace element that can be found as a dietary supplement, as well as naturally in some foods and some forms of salt. Iodine is a necessary component of the thyroid hormones triiodothyronine (T3) and thyroxine (T4) (T3).

To know more about Iodine, visit:

https://brainly.com/question/6773013

#SPJ9

Explanation:

It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.

C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.

To know more about Hydrogen check the below link:

https://brainly.com/question/2079874

#SPJ1

44.25 gmol of CO and 40.5 gmol of H2O were produced from  thermal decomposition of 5.0 kg of the unknown starch.

Based on given elemental composition of the starch, we can calculate the molecular formula of starch as C6H10O5.

Mass of C in 5.0 kg starch =\(5.0 kg * 21.24 wt\% = 1.062 kg\)

Mass of H in 5.0 kg starch =\(5.0 kg * 3.24 wt\% = 0.162 kg\)

Mass of O in 5.0 kg starch = \(5.0 kg * 75.52 wt\% = 3.776 kg\)

Using the molecular formula C6H10O5, the total molar mass of starch is 162 g/mol. The balanced chemical equation for thermal decomposition of the starch:\(C6H10O5 -- > 6CO + 5H2O\)

Moles of CO = \((1.062 kg / 12 g/mol) * (6 mol CO / 1 mol C6H10O5) = 44.25 mol CO\)

moles of H2O = \((0.162 kg / 2 g/mol) * (5 mol H2O / 1 mol C6H10O5) = 40.5 mol H2O\)

volume of CO = \((44.25 mol CO) *(22.4 L/mol) = 991.8 L CO\)

volume of H2O = \((40.5 mol H2O) * (22.4 L/mol) = 907.2 L H2O\)

Therefore, 44.25 gmol of CO and 40.5 gmol of H2O were produced from the thermal decomposition of 5.0 kg of the unknown starch.

To know more about  thermal decomposition, here

brainly.com/question/14068545

#SPJ4

Answer:

A) 12 mol H2O.

Explanation:

Hello,

In this case, for the given reaction:

\(2C_2H_6+7O_2\rightarrow 4CO_2 + 6 H_2O\)

We notice that oxygen is in a 7:6 molar relationship with water, for that reason, the resulting moles of water turn out:

\(n_{H_2O}=14molO_2*\frac{6molH_2O}{7molO_2} \\\\n_{H_2O}=12molH_2O\)

Thus, the answer is A) 12 mol H2O.

Best regards.

The joint in the human body which is similar to the chicken wing joint is referred to as the elbow joint.

This is referred to as a point where two or more bones meet and are usually lined with cartilages so as to reduce the effect of friction as it causes wear and tear of the skeletal structures which are important for our movement.

The chicken has a structure called wing as its hands which is therefore the reason why it is similar to that of the elbow joint in humans and makes it the correct choice.

Read more about Joint here https://brainly.com/question/1007674

#SPJ1

Lowering the temperature and increasing the pressure of the solution would generally result in a solid coming out of a solution through crystallization.

Crystallization is a process in which a solid forms from a solution by the arrangement of particles into a regular, repeating pattern. Here are the steps involved:

1. Dissolving: Initially, a solute is dissolved in a solvent to form a solution. The solute particles are dispersed and surrounded by the solvent molecules.

2. Saturation: The solution is then brought to a state of saturation by adding more solute or removing the solvent, such that no more solute can dissolve. At this point, the solution contains a high concentration of the solute.

3. Nucleation: When the solution becomes saturated, it becomes unstable, and the solute molecules start to come together and form tiny clusters or nuclei. These nuclei serve as the starting points for crystal growth.

4. Crystal Growth: Once the nuclei form, they start growing as more solute particles join the crystal lattice. This growth occurs by the addition of solute molecules from the solution onto the existing crystal surface.

Now, let's look at how temperature and pressure affect this process:

- Lowering the temperature: Decreasing the temperature of the solution slows down the movement of solute molecules, reducing their kinetic energy. This leads to a decrease in solubility, meaning less solute can remain dissolved in the solution. As a result, excess solute comes out of the solution and starts forming crystals.

- Increasing the pressure: When the pressure of the solution is increased, it compresses the solvent and alters its properties. This compression can enhance the solubility of the solute, allowing it to dissolve more effectively. Consequently, increasing pressure generally inhibits crystallization as more solute remains dissolved in the solution.

Therefore, lowering the temperature favors crystallization by decreasing solubility, while increasing the pressure generally inhibits crystallization by increasing solubility.

Learn more about Crystallization here

https://brainly.com/question/1212769

#SPJ11

Using the formula M1V1 = M2V2, the molarity of M1 = 5M, V1 = 30mL M2 = x V2 = 300mL is 0.5M. Option B is the correct answer.

To solve for the unknown in the given problem, we need to use the formula M1V1 = M2V2. This formula states that the amount of solute (Molarity) in a solution is constant, as long as the volume of the solution is constant.

We are given M1 = 5M and V1 = 30mL, and we need to find M2, given V2 = 300mL. Substituting these values into the formula, we get:

5M × 30mL = M2 × 300mL

Simplifying this equation, we get:

150 = 300M2

Dividing both sides by 300, we get:

M2 = 0.5M

Therefore, the answer is B. 0.5M, which represents the molarity of the unknown solution. In summary, we used the formula M1V1 = M2V2 and substituted the given values to find the unknown molarity, which was the solution to the problem.

Learn more about Molarity at

https://brainly.com/question/8732513

#SPJ4

Spinal cord is a  hollow tube along the back of an animal with nerves running inside or beside it is a characteristic of chordates.

A chordate  is an animal of the phylum Chordata. All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits,. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit metameric segmentation.

In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels  in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cephalochordates. These CSIs provide molecular means to reliably distinguish chordates from all other Metazoa.

Learn more about chordates,here:

https://brainly.com/question/12406059

#SPJ3

A)1.75×3 moles of carbon monoxide

B)2:3

A)each mole of ferric oxide requires 3 moles of carbon monoxide. Therefore 1.75 moles requires 1.75 ×3 moles of carbon monoxide

Answer:

Explanation:

You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.

Answer:

when lit, the atoms of different chemical compounds inside the firework absorb energy, when the electrons fall back to lower energy levels, they give off colored light. Depending upon the chemical used, different colors are produced. neon lights or signs are glass tubes filled with neon gas. When the light is plugged in, the electrical energy causes the electrons of neon to jump to higher energy levels, when they go to lower levels, colored light is given off. The neat thing is that the neon never gets used up. The only thing that gets used up is the electricity. The electrons don't get destroyed and can be used over and over again jumping levels. Neon glows with an orange light, but you know that neon signs can be lots of different colors. The variations come when different gases other than neon are used such as argon, or krypton or when the tube is painted so that with the light produced it produces a certain color.

Explanation:

After being excited by high levels of electrical energy (as in neon signs) or heat energy, various elements and molecules will emit their own specific colors of light.

Metals burn in a variety of colors. When a copper compound is lit, for example, the flame is blue-green.

Calcium burns red, while potassium burns purple. Metals are combined to produce various colors in fireworks.

The appearance of each firework is determined by the type of stars it contains, as well as the size and quantity of these pellets.

Some stars contain metal salts, which produce brilliant colors, while others contain a variety of chemical compounds that produce dazzling light effects such as strobing, sparkling, and others.

Various elements and molecules will emit their own specific colors of light after being excited by high levels of electrical energy (as in neon signs) or heat energy (as in the fireworks).

Thus, the neon signs or fireworks provide different colors.

For more details regarding fireworks, visit:

https://brainly.com/question/16737516

#SPJ2

Answer:

B) C3H3O and C6H6O2

Explanation:

Given data:

Molar mass of compound = 100 g/mol

Percentage of hydrogen = 5.45%

Percentage of carbon = 65.45%

Percentage of oxygen = 29.09%

Empirical formula = ?

Molecular formula = ?

Solution:

Number of gram atoms of H = 5.45 / 1.01 = 5.4

Number of gram atoms of O = 29.09/ 16 = 1.8

Number of gram atoms of C = 65.45 / 12 = 5.5

Atomic ratio:

            C                      :      H            :         O

           5.5/1.8              :     5.4/1.8     :        1.8/1.8

            3                      :        3          :        1

C : H : O = 3 : 3 : 1

Empirical formula is C₃H₃O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = 12×3 + 1.01 ×3 + 16×1 = 55.03  

n = 100 / 5503

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₃H₃O)

Molecular formula = C₆H₆O₂

Answer:

The physical properties of minerals are determined by the atomic structure and crystal chemistry of the minerals. The most common physical properties are crystal form, color, hardness, cleavage, and specific gravity. One of the best ways to identify a mineral is by examining its crystal form (external shape).

Answer:

not enough information need more information to answer it

Answer:

Compare your two units. The two units must measure the same thing.

For example, in the problem "convert 2 inches into centimeters," both inches and centimeters measure length. If your units measure two different things (like length and weight), you can't convert between them.

or

Look up the conversion. Before you can do the math, you need to know how much larger one unit is than the other.If the conversion you find has many decimal places, round to the nearest significant digit. If you don't know what a significant digit is, round to the second or third digit.

For example, if you need to convert 2 inches to centimeters, you need to know that 1 inch = 2.54 centimeters.

Explanation:

Hope this will help

please make my answer as brainelist

The approximate density of the high-leaded brass is 8.80 g/cm³.

High-leaded brass is an alloy composed of copper (Cu), zinc (Zn), and lead (Pb). To determine its density, we need to consider the weight percentages of each element and their respective densities. In this case, the composition is 62.5 wt% Cu, 30.5 wt% Zn, and 7.0 wt% Pb.

To calculate the density, we multiply the weight percentage of each element by its density and then sum them up.

For copper:

Weight percentage of Cu = 62.5%

Density of Cu = 8.94 g/cm³

Contribution to density = 62.5% × 8.94 g/cm³ = 5.5875 g/cm³

For zinc:

Weight percentage of Zn = 30.5%

Density of Zn = 7.13 g/cm³

Contribution to density = 30.5% × 7.13 g/cm³ = 2.17865 g/cm³

For lead:

Weight percentage of Pb = 7.0%

Density of Pb = 11.35 g/cm³

Contribution to density = 7.0% × 11.35 g/cm³ = 0.7945 g/cm³

Summing up the contributions, we get:

5.5875 g/cm³ + 2.17865 g/cm³ + 0.7945 g/cm³ = 8.56065 g/cm³

Rounding off to the appropriate number of significant figures, the approximate density of the high-leaded brass is 8.80 g/cm³.

Learn more about brass

brainly.com/question/30346534

#SPJ11

The bond between the nitrogen and the amide group in distamycin would be cleaved by acid hydrolysis.

Distamycin is a peptide antibiotic that has demonstrated antiviral, antibiotic, and antitumor activity. It does this by binding to the minor groove of DNA.Acid hydrolysis is a process in which molecules are broken down in the presence of an acid. Acid hydrolysis is widely used to cleave certain types of chemical bonds.

When treated with acid hydrolysis, the bonds that hold the molecule of distamycin are broken, leading to the production of its derivatives.To identify the bonds that would be cleaved by acid hydrolysis in distamycin, we must first examine its chemical structure. Distamycin has two aromatic rings, a nitrogen-containing heterocycle, and an amide-containing tail. In the presence of acid, the amide bond is cleaved, leading to the production of two smaller peptides and an acid. To place a line through each bond that would be cleaved by acid hydrolysis, we can isolate the amide bond in the structure.

Thus, the amide bond is located between the nitrogen-containing heterocycle and the amide-containing tail. Therefore, the bond between the nitrogen and the amide group is the one that would be cleaved.

Learn more about DNA:

https://brainly.com/question/30006059

#SPJ11

Answer:

A flame is defined as the gaseous part of the fire which is visible to us. A flame is created due to the high exothermic reaction.

Two types of flames based on the amount of oxygen available are:

Answer:

Final volume is 1.29cm³

Explanation:

Using combined gas law:

P₁V₁/T₁ = P₂V₂/T₂

Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of a gas.

We can solve the volume of the gas:

P₁ = 1atm at STP

V₁ = 1cm³

T₁ = 273.15K at STP

P₂ = 710mmHg * (1atm / 760mmHg) = 0.9342atm

V₂ = ?

T₂ = 55.0°C + 273.15K = 328.15K

Replacing:

1atm*1cm³/273.15K = 0.9342atm*V₂/328.15K

1.29cm³ = V₂

When many excess hydrogen ions accumulate in the blood, the serum pH decreases, leading to a more acidic blood environment.

When excess hydrogen ions (H+) accumulate in the blood, it causes an increase in H+ concentration leads to a more acidic environment. Serum pH is a measure of the acidity or alkalinity of blood. As H+ concentration increases, the serum pH value decreases. A decrease in serum pH indicates a more acidic blood condition.

This condition is known as acidosis. The body has mechanisms to regulate pH levels and prevent acidosis, such as the release of bicarbonate ions and the removal of excess hydrogen ions through the kidneys. However, if acidosis persists, it can lead to serious health complications.

To know more about Serum pH:

https://brainly.com/question/29661910

#SPJ11