how much volume in ml will you need to take from 2.7 m concentrated stock solution if you would like to prepare a diluted 0.8 solution with 100 ml? report and round your answer to a whole integer.

It is important to use a volumetric pipette and volumetric flasks  because they are marked with one trace, they are calibrated and there are very less chance of error in them.

The percentage error of volumetric flask is very low at 0.3%. Volumetric pipette and volumetric flasks are specially designed to give accurate measurements of liquids and make them suitable for preparing standard solutions.

The volumetric pipette has a long and narrow neck which makes it easier to measure.      

Graduated cylinders are more accurate then beakers. However they are not used to carry volumetric evaluations for this purpose volumetric tools like flasks and pipettes are used because they are more accurate and exact.

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The number of moles of [tex]O_2[/tex] required to react with 2 moles of [tex]H_2[/tex] according to the reaction will be 4 moles.

From the balanced equation of the reaction:

[tex]2H_2 (g) + O_2 (g) -- > 2H_2O (g)[/tex]

The mole ratio of hydrogen to oxygen is 2:1. This means that for every 1 mole of hydrogen that reacts to form 1 mole of water, 0.5 moles of oxygen is required. Also, for every 1 mole of oxygen, 2 moles of hydrogen are required.

Once the mole of hydrogen increases, the mole of oxygen also has to increase proportionately. Otherwise, oxygen becomes limited in availability, and hydrogen will be in excess.

From the equation of the reaction, 1 mole of oxygen requires 2 moles of hydrogen. Thus, with 2 moles of oxygen, 4 moles of hydrogen will be needed for a complete reaction.

In summary, the number of moles of [tex]O_2[/tex] that are required to react with 2 moles of [tex]H_2[/tex] is 4 moles.

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The reaction is exothermic as it involves a bond-forming process

when the liquids are mixed temperature of the reaction between the mixture increases.

There are small and large clusters in the mixture

The exothermic reaction involves the formation of new bonds which involves a combination of the bonds to form a new compound in our case water has hydroxy ions that bond with those of ethanol.

Mixing ethanol and water in volumetric glassware reduces the volume and increases the temperature.

The numerical example

Fill two 250 mL graduated cylinders to the line with water and ethanol pure temperature sensor shows both at room temperature. Next, move the temperature probe to an empty 500 mL graduated cylinder and pour the contents of the two smaller cylinders simultaneously and mix well.

The temperature of the mixture will rise by about 8 °C and the volume will decrease to 480 this indicates that the reaction is exothermic as the temperature rises and volume reduces

yes, clusters are present as ethanol falls between the spaces left by water as it has small molecules than that of water.

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Preform the mathematical operation and then write the answer to the correct number of significant figures.

a) 110 g

b) 9030 cm

c) 6.0 cm

d)9.6 mm

e) 419.8 mL

f) 766.8 m

a) 100 g + 10 g = 110g

b) 903 cm × 10 cm = 9030 cm

c) 0.6030 cm² / 0.1 cm = 6.0 cm

here lowest significant is = 0.1 , so ans will round off till first decimal.

d) 9.5 mm + 0.083 mm = 9.583 mm = 9.6 mm

e) 430.0 mL -10.2111 mL = 419.8 mL

f) 762.4 m + 3.2 m + 1.21 m = 766.8 m

here the lowest significant figure = 3.2 , so the ans will be round off to first decimal figure.

Thus, preform the mathematical operation and then write the answer to the correct number of significant figures.

a) 110 g

b) 9030 cm

c) 6.0 cm

d)9.6 mm

e) 419.8 mL

f) 766.8 m

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The molarity of a solution is calculated from the number of moles of solute and the volume of solution in liters. The molarity of potassium permanganate solution 2.145 g of  iron(ii) ammonium sulfate hexahydrate is 0.121 M.

Molarity is used to represent the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity depends on the temperature also.

The number of moles of a solute can be calculated from the molar mass and taken weight of the solute.

The molar mass of  iron(ii) ammonium sulfate hexahydrate = 392.1 g/mol

Taken weight of solute = 2.145 g.

Therefore, the number of moles of  iron(ii) ammonium sulfate hexahydrate = 2.145 / 392.1

                     = 0.0054 moles.

Now, the molarity of the solution is calculated as follows:

Molarity of  solution  =( no.of moles of  iron(ii) ammonium sulfate hexahydrate ) / volume

                                    = 0.0054 /0.045 L

                                    = 0.121 M

Hence, The molarity of potassium permanganate solution 2.145 g of  iron(ii) ammonium sulfate hexahydrate is 0.121 M.

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zn + 2 AgCI-> ZnCI2+ 2Ag

2 FeCI3+ 3 H2s->___FeCI2+ 6 HCI+___s

2 Ag2O-> 4 Ag+ O2

4AI2O3-> 3 AI+ 2O2

2 K+ 2H2O-> 2 KOH+ H2

Caco3-> CaO+ CO2

2 MG+ O2-> 2MgO

CO+ 3 Fe2O3-> 2 Fe+ 3CO2

2 H2+ 3 Fe2O3-> Fe+ 3H2O

HCI+ 2 ZN-> H2+ ZnCI2

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Answer:

Elements

Explanation:

I'll assume that the correct element symbol is Cl, not CL.  CL would mean a compound made up of one carbon (C) and one Unknown element (L),  Cl means chlorine.

I aslo wonder if the compound is [tex]Cl_{2}[/tex] and not [tex]Cl_{3}[/tex].  Regardless, both would be elements.  A compound is made up of 2 or more different elements.  A mixture is 2 or more compounds.

''They carry energy''. is the right statement about waves.

A wave is defined as a disturbance in a medium that carries energy without any movement of particles. It may take elastic deformation, a variation of pressure, electric intensity, magnetic intensity, electric potential, and temperature. There are three types of waves i.e. matter waves, mechanical waves, and electromagnetic waves.

All types of waves have the same basic properties of reflection, refraction, diffraction, and interference. All waves have a wavelength, frequency, speed, and amplitude. A wave can be explained by its length, amplitude, and frequency. All waves transfer energy from one place to another, they can also be reflected as well as refracted.

So we can conclude that option A is the right answer about the waves.

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The fusion of hydrogen nuclei into helium nuclei in the solar core is how the Sun obtains its energy. The proton-proton chain, a series of nuclear fusion processes, describes this hydrogen burning.

Protons, which are just single hydrogen atoms, are the starting point of this process inside the sun. Through a series of stages, these protons fuse together to form helium. This fusion process takes place in the sun's core, and the energy released as a result of transmutation maintains the sun's hot.

A deuterium (2H) nucleus is created from two protons in the first step of the hydrogen fusion process, along with an antielectron and a neutrino.

Four hydrogen protons and two electrons are used in the basic hydrogen fusion cycle, which results in the creation of a helium nucleus, two neutrinos, and six photons.

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Hence 3.23×10⁶kJ = 771970 kilo calorie.

Kilo joule is a unit of energy that is equal to 1000 joules.

1 kilojoule is equal to 1000 joules:

∵ 1kJ = 0.239kcal

∴ 3.23×10⁶kJ = 3.23×10⁶ × 0.239

                      = 771970 kcal

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Answer:

Explanation: when electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.

The heat of reaction is  1.8 KJ. A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.

Volume of water = 67.9 mL

Since the density of water is 1.00 g/mL

Density = mass/volume

Mass of water = Density × volume

Mass of water =  1 g/mL × 67.9 mL

Mass of water = 67.9g or 0.0679 Kg

Temperature change =  6.5 oC

Specific heat capacity of water= 4.184 J/Kg

From;

H = mcθ

m = mass of water

c = heat capacity of water

θ = temperature rise

Substituting values;

H = 0.0679 Kg × 4.184 J/Kg × 6.5 oC

H = 1.8 KJ

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First, we have to remember the law of conservation of matter:

"The matter can not be created nor destroyed. It can only be transformed".

Then, the answer, in theory, has to be 11.0 g, that is the addition of 5.0 g and 6.0 g.

The best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment

Organ system is the group of tissue that work together for the overall function of organ and also organ system is the group of organ that work together to perform a specific function and the human organ consist of eleven organ system and that is respiratory, execratory, circulatory, digestive etc and the best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment because when your muscle and skeletal system are working to help your body increase heat when shivering

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According to Laplace's law lungs should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.

According to this law of Laplace, if the radius of the blood vessel is larger than the wall tension required will be larger in order to withstand or overcome the pressure which is exerted by internal fluids or gases.

The alveoli are to remain inflated as the gaseous pressure which is developed inside the alveoli is greater than the pressure of atmosphere.

When the blood vessel thickens or its thickness increases, it will result in the reduction of the tension developed by the gas at a given constant pressure.

It was published in a research paper that according to law of Laplace, lung should remain inflated because air pressure in alveoli is more than the pressure of the atmosphere.

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The concentration of the dilute solution is 0.3592 M.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

If the concentrated nitric acid solution is 12.0 M, then there are 12.0 moles nitric acid per liter of solution.

For a 4.49 ml of a concentrated 12.0 M nitric acid solution, the number of moles is 0.05388.

M = moles of solute / volume of solution

moles = 12.0 M(4.49 ml)(1 L / 1000 ml)

moles = 0.05388 moles nitric acid

If the total volume is 150 ml, then the concentration of the diluted solution is

M = moles of solute / volume of solution

M = 0.05388 moles nitric acid / 150 mL (1 L / 1000 ml)

M = 0.3592

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The volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.

Volume is defined as the area that any three-dimensional solid takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres.

The cubic meter serves as its equivalent in the International System of Units. Given that it can be computed using lengths, it is not regarded as a fundamental unit of the SI. The liter is the most widely used measurement.

The cube's volume is equal to the edge's length raised by three.

Thus, the volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.

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1) The reaction is exothermic and heat is a product

2) The color would turn to pink.

Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.

If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.

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The mass number of an atom that has 53 protons, 78 neutrons, and 54 electrons would be 131.

A mass number can be described as the sum total of the number of protons and neutrons that are contained within the nucleus of an atom.

If we want to calculate the mass number of an atom, we need to add the number of neutrons present inside the atoms with the number of protons present inside the atom.

As mentioned in the question, the number of protons inside the said atom is 53 whereas the number of neutrons is 78. Hence,

53+78= 131

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The minimum mass of  sulphur , in grams, needed to prepare 17.5 g of [tex]H_{2} So_{4}[/tex]is 53.5 gram

The molecular mass of eight molecules of sulphuric acid is 784 grams.

So 256 grams of sulphur makes 784 grams of sulphuric acid

That means 17.5 grams of sulphur can give

[tex]\frac{784}{256}[/tex] ×17.5 grams of sulphuric acid

And by solving this we get 53.5 grams.

That's how we determined the required grams of sulphur in grams.

The mass of a given molecule is its molecular mass (m), which is expressed in daltons. Because they contain various isotopes of an element, different molecules of the same compound can have distinct molecular masses. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the dalton).

The molar mass, which is expressed in g/mol, is defined as the mass of a given substance divided by the amount of a substance. That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule.

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Using the percentage by volume of the solutions given, we can calculate that we require 216 mL of 100% alcohol and 384 mL of 50% alcohol.

The percentages given refer to the percentage by volume (%V). We need to make 600 mL of 68% alcohol solution, by mixing a certain volume of 50% solution (A) and a certain volume of 100% alcohol (B). So, we know that:

A + B = 600 mL

We also know that the total volume of alcohol in the end solution needs to be:

0.68 * 600 mL = 408 mL

So, by extension:

0.50 * A + B = 408 mL

Based on the first equation, we can say that:

A = 600 mL - B

If we use that A in the second equation we get:

0.50 * (600 mL - B) + B = 408 mL

300 mL - 0.50 B + B = 408 mL

If we rearrange this equation we get:

B - 0.50 * B = 408 mL - 300 mL

0.50 * B = 108 mL

B = 108 mL / 0.50

B = 216 mL

A = 600 mL - 216 mL = 384 mL

So, we need 216 mL of 100% alcohol and 384 mL of 50% alcohol solution to get 600 mL of 68% alcohol solution.

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Answer:216 ml

Explanation: I got it right

A total of 2269 balloons of 1.5 Liters volume and 1.25 atm pressure can be filled from the cylinder of volume 2.3 Liters and 1850 atm pressure.

The volume of the Helium gas is 2.3L and the pressure is 1850 atm at 25° Celsius.

The smaller balloons that has to be filled are of volume 1.5 L at the pressure 1.25atm at the same temperature of 25° C.

Because the temperature is conserved, so, according to Boyle's law,

When temperature is constant, the pressure and volume of the gas are inversely proportional to each other.

we can write,

P₁V₁ = P₂V₂

Let us say that a total n numbers of smaller balloons can be filled, so,

P₁V₁ = n(P₂V₂)

Where,

P₁ is pressure of bigger balloon,

V₁ is the volume of the bigger balloon,

P₂ is the pressure of the smaller balloon and,

V₂ is the volume of the smaller balloon.

Now, putting all the values,

2.30 x 1850 = n(1.5 x 1.25)

n = 2269

So, a total 2269 balloons can be filled from the bigger balloon to the smaller balloons.

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Answer:

The attraction is a hydrogen bonding.

Explanation:

Based on the information on intermolecular forces, when a Hydrogen is specifically bonded with a Nitrogen, Oxygen or Fluorine, their bonding is called a hydrogen bond.

Answer:

Problems of Using Ionic and Covalent Compounds in Medicine

Stomach pain.

Nausea.

Vomiting.

Heartburn.

Gas.

Constipation.

Diarrhea.

The mass number of this atom having 53 protons, 78 neutrons, and 54 electrons will be 131.

In the field of science, we can describe a mass number of an atom as simply a measure of the protons and neutrons that are to be found in the nucleus of an atom. In chemistry, the mass number is denoted by the letter 'A'.

In the above-mentioned case, the number of protons of the atom is 53 whereas the number of neutrons is 78.

In order to calculate the mass number, we will add the number of protons and neutrons. As the result of the addition of 53+78 is 131 hence, the mass number will be 131.

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The balanced reaction equation for this redox reaction looks like this:

H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)

First, we write what we know about the reaction:

Hydrogen sulfide (H₂S) that is dissolved in the wastewater (so the physical state is (aq)) is reacting with gaseous chlorine (so Cl₂(g)) to form sulfur (which is solid at room temperature, and does not dissolve in water, so S(g)) and chloride ions (Cl⁻). To counter their negative charge, we add the hydrogen from H₂S to chlorides, which results in HCl, which is soluble in water, so the physical state is (aq):

H₂S(aq) + Cl₂(g) → S(s) + HCl(aq)

When we look at this equation we can see that it is not balanced, because we have 2 H atoms and 2 Cl atoms on the left, and only 1 of both on the right. The easiest way to rectify this is to add "2" in front of HCl, resulting in a balanced reaction equation:

H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)

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Answer:

H202(aq)+2Fe2+(aq)+2H+=>2fe3+(aq)+2H20(l)

Explanation:

H202(aq)+2Fe2+(aq)+2H+=>2fe3+(aq)+2H20(l)

To solve this problem, we must take into account Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 atoms. Applying this relationship we have that the moles of potassium (K) are:

Now, to go from moles to grams, we must multiply the moles by the molar mass of potassium. The molar mass of potassium is 39.1g/mol. So, the grams of potassium will be:

Answer: In 3.4x10^23 atoms of potassium there are 22.1 grams