A solution made from 35 ml of ethanol and 75 ml of water has what volume percentage of ethanol?

1. a) Decantation: It is a technique that involves carefully pouring off a liquid, leaving behind sediment. For example, in a mixture of oil and water, decantation can be used to separate the oil and water layers.

b) Centrifugation: It is a technique that involves the separation of particles from a liquid or solution under centrifugal force. The centrifugal force causes denser particles to separate from the lighter particles.

c) Supernatant: It is a term used to describe the liquid present above a solid or sediment after decantation or centrifugation.

d) Precipitate: It is a solid that forms from a solution during a chemical reaction or by changing physical conditions such as temperature or pressure.

2. The reagents that can be used to identify and confirm Ag, Hg2²⁺, and Pb²⁺ ions are given below:

a) Ag⁺ ions: They can be identified by adding a few drops of hydrochloric acid to the solution. The formation of a white precipitate indicates the presence of Ag⁺ ions.

b) Hg₂²⁺ ions: They can be identified by the formation of a brownish-red precipitate upon the addition of potassium iodide solution.

c) Pb²⁺ ions: They can be identified by the formation of a white precipitate upon the addition of hydrochloric acid and potassium iodide.

It's important to note that confirmatory tests may involve additional reagents and experimental procedures to ensure the accurate identification of these ions. Confirmatory tests are critical to ensure accurate identification of ions and may involve additional reagents and procedures to confirm the results obtained from initial tests. These tests help to eliminate false positives or negatives and provide a more definitive identification of the ion in question. It's crucial to follow established protocols and safety guidelines when performing confirmatory tests to obtain reliable and reproducible results.

Learn more about decantation https://brainly.com/question/30067228

#SPJ11

Answer:

21.65

Explanation:

The average = total divided by the number of readings

21.57

22.04

21.35

Total = 64.96

Average = 64.96 / 3 = 21.65

Answer:

11 and equals the number of protons

Explanation:

Si reaccionan 50 g de silicio (P.A. = 28,08 g) con 80 % de pureza y suficiente oxígeno, se podría obtener A. 1,42 moles de SiO₂.

Consideremos la ecuación balanceada para la reacción entre silicio y oxigeno.

Si + O₂ ⇒ SiO₂

Tenemos 50 g de silicio con una pureza del 80%. La masa pura de silicio es:

\(50 g \times 80\% = 40 g\)

Podemos calcular los moles de SiO₂ obtenidos a partir de 40 g de Si usando los siguientes factores de conversion:

\(40gSi \times \frac{1molSi}{28,08gSi} \times \frac{1molSiO_2}{1molSi} = 1,42 mol SiO_2\)

Finalmente, convertiremos 1,42 moles de SiO₂ a gramos usando su masa molar (60,08 g/mol).

\(1,42 mol \times \frac{60,08g}{mol} = 85,3g\)

Si reaccionan 50 g de silicio (P.A. = 28,08 g) con 80 % de pureza y suficiente oxígeno, se podría obtener A. 1,42 moles de SiO₂.

Puedes aprender mas aqui: https://brainly.com/question/23138630

Answer:

I DONT KNOW SORRY

Explanation:

Answer:

Iodine-131 is more likely to undergo beta decay than positron decay.

The molarity of the base used in the experiment, which was determined based on the recovered NaCl and the volumes of hydrochloric acid and sodium hydroxide, was approximately 1.15 M.

To determine the molarity of the base used in the experiment, we need to use the stoichiometry of the balanced chemical equation and the given data.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

First, we need to find the number of moles of NaCl produced. We can do this by using the given mass of NaCl (2.22 g) and its molar mass (58.44 g/mol):

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 2.22 g / 58.44 g/mol

moles of NaCl = 0.038 moles

Next, we can use the stoichiometry of the balanced equation to determine the number of moles of NaOH that reacted. Since the mole ratio between NaCl and NaOH is 1:1, the number of moles of NaOH is also 0.038 moles.

Now, we can calculate the molarity of the base (sodium hydroxide) using the given volume of sodium hydroxide solution (0.033 L):

Molarity of NaOH = moles of NaOH / volume of NaOH solution

Molarity of NaOH = 0.038 moles / 0.033 L

Molarity of NaOH ≈ 1.15 M

Therefore, the molarity of the base used in the experiment is approximately 1.15 M.

For more such question on experiment. visit :

https://brainly.com/question/20639065

#SPJ8

Due to double bonds in the carbon chain of an unsaturated fatty acid, there are fewer hydrogens than those found in saturated fatty acids.

An unsaturated fatty acid can be defined as a carboxylic acid that contains one or more carbon-carbon double bonds.

As a result of the double bonds in unsaturated fatty acids, they are liquid at lower temperature because they aren't tightly packed together.

Consequently, there are fewer hydrogens in unsaturated fatty acids than those found in saturated fatty acids because of the double bonds in its carbon chain.

Read more on unsaturated fatty acids here: https://brainly.com/question/1580524

Lead Air toxics is not a criteria pollutant.

Criteria air pollutants are those for which it is possible to define tolerable exposure levels and for which an ambient air quality standard has been established. Ozone, carbon monoxide, nitrogen dioxide, and sulfur dioxide are among examples.

The cardiovascular system, nervous system, kidney function, immune system, and reproductive and developmental systems can all suffer harm from lead exposure. Lead exposure also affects the blood's capacity to carry oxygen.

Lead poisoning can weaken you, damage your kidneys and brain, and cause anemia. High levels of lead exposure can be fatal. Because lead can pass through the placental barrier, pregnant women who are exposed to it also put their unborn child at risk. The growing neurological system of a baby can be harmed by lead.

To know more about criteria air pollutant click here:

https://brainly.com/question/30026042

#SPJ4

Answer:

D

Explanation: When you chill a substance when it is mixed with another substance, ( chilled vinegar mixed with sodium bicarbonate will react slower for instance) it reacts slower do to the molecules slowing down when chilled.

\(\huge\boxed{Option D}\)

a liquid mixture in which the the solute which is in a smaller proportion is uniformly distributed within the the solvent which is the major component is called a solution.

It increases the rate of reaction,  because when we stir the solute in the solution, the mixed solute particles are distributed more further than when they are left stationary, making the environment (which surrounds the solute) less concentrated by the dissolved solute thus the rate increases and more solute is mixed.

No, A reacting substances  in water are those which can react with water that are Ionic metal. Water is made of ions \(H^+ and OH^-\). Substances(solute), they mix or dissolve more because Solutes ions interact with the ions of a water(solvent), thus breaking the bonds between the solute and then ions of solute form bond with the ions of water. Thus the rate increases in water.

No, because by the increase in temperature, the kinetic energy of more  molecules of a substance increase which results in reaching the threshold energy(minimum energy required by the molecules to change into product) of more molecules. So less molecules are left with low energy.

Yes, the rate of reaction decreases because  the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less molecules make up to the threshold energy. So decrease in temperature lowers the rate of the reaction.

Answer:

\(CF_{4}\)

Explanation:

See attached worksheet

Answer nic configuration of excited state of Neon will be 1s22s22p53s1.

Explanation:

46.12 grams of water are produced when 35 grams of \(C_6H_1_0\) react with 45 grams of \(O_2\).

The balanced equation for the combustion of C6H10 (cyclohexene) with O2 is:

\(C_6H_{10} + O_2 - > CO_2 + H_2O\)

From the balanced equation, we can see that 1 mole of  \(C_6H_1_0\) reacts with 6 moles of O2 to produce 6 moles of water.

First, let's calculate the number of moles of C6H10 and O2:

Molar mass of C6H10 = 6(12.01 g/mol) + 10(1.01 g/mol) = 82.16 g/mol

Number of moles of C6H10 = mass / molar mass = 35 g / 82.16 g/mol ≈ 0.426 mol

Molar mass of O2 = 2(16.00 g/mol) = 32.00 g/mol

Number of moles of O2 = mass / molar mass = 45 g / 32.00 g/mol ≈ 1.406 mol

From the stoichiometry of the balanced equation, we can determine that 0.426 moles of C6H10 will produce 0.426 * 6 = 2.556 moles of water.

Now, let's calculate the mass of water produced:

Molar mass of H2O = 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol

Mass of water = number of moles of water * molar mass of water

                        = 2.556 mol * 18.02 g/mol

                        ≈ 46.12 g

Therefore, approximately 46.12 grams of water are produced when 35 grams of C6H10 reacts with 45 grams of O2.

More on stoichiometric problems can be found here: https://brainly.com/question/32305503

#SPJ1

Most acid waves used in salons have a pH value between 4.5 and 7.0. The pH value of an acid wave determines its strength and the degree of curl that can be achieved on the hair.

A lower pH value indicates a stronger acid and a tighter curl, while a higher pH value indicates a weaker acid and a looser curl. Acid waves are typically milder than alkaline waves, which have a pH value of around 9.0-9.6 and are less damaging to the hair.

It is important to choose the right strength of acid wave based on the type and condition of the hair. Fine or damaged hair requires a milder acid wave, while coarse or resistant hair requires a stronger one. Acid waves are typically left on the hair for a shorter period of time than alkaline waves, which reduces the risk of overprocessing and damage to the hair.

Learn more about stronger acid here:

https://brainly.com/question/31147529

#SPJ11

The element in question is Avogadro's number, which is 6.022 x 10^23. Given that the mass of the element is 135 g and there are 3.01 x 10^24 atoms is 135 g / 3.01 x 10^24 atoms = 4.49 x 10^-23 g/atom

A fundamental object that is difficult to divide into smaller parts is known as an element. A substance that cannot be broken down by non-nuclear reactions is considered an element in chemistry and physics.

we can compare this atomic mass to the known masses of elements and find that the element in question is silver (Ag), which has an atomic mass of 107.87 g/mol.

To know more about Avogadro's visit:-

https://brainly.com/question/11907018

#SPJ11

"All of the above" (option a) is clear evidence that the additional carbon dioxide in the air over the industrial era is from fossil fuel origin.

This is because carbon dioxide is one of the main greenhouse gases released during the combustion of fossil fuels. All of these factors serve as clear evidence that the additional carbon dioxide in the air over the industrial era is from fossil fuel origin.

The term "fossil fuel" refers to natural resources such as coal, oil, and natural gas that have been formed from the remains of ancient plants and animals. When these fuels are burned, carbon dioxide is released into the atmosphere.

Methane, on the other hand, is another greenhouse gas that is also released during the extraction and use of fossil fuels. Coincident changes in methane levels can indicate a connection between the burning of fossil fuels and the increase in carbon dioxide in the air.

Therefore, all of these factors serve as clear evidence that the additional carbon dioxide in the air over the industrial era is from fossil fuel origin.

Thus option a is correct.

Learn more about carbon dioxide from the given link:

brainly.com/question/25385913

#SPJ11

The negatively charged subatomic particles that J.J. Thomson discovered are now called electrons. Subatomic particles can be either neutral, positively charged, or negatively charged. Protons, for example, are positively charged subatomic particles. Electrons, on the other hand, are negatively charged subatomic particles

What are charged subatomic particles? Subatomic particles can be either neutral, positively charged, or negatively charged. Protons, for example, are positively charged subatomic particles. Electrons, on the other hand, are negatively charged subatomic particles. Neutrons are the third type of subatomic particle, but they are neutral, which means they do not have a charge. What did J.J. Thomson discover? J.J. Thomson was a British physicist who, in the late 19th century, conducted a series of experiments on cathode rays. Cathode rays are beams of electrons that are produced in a vacuum tube when an electric current is passed through it. Thomson used cathode rays to investigate the structure of atoms. In 1897, Thomson discovered that cathode rays are made up of negatively charged subatomic particles. He named these particles "corpuscles," but they are now known as electrons. Thomson's discovery of the electron revolutionized atomic physics and led to the development of the electron model of the atom. Electrons are important because they are responsible for chemical reactions and are involved in electricity and magnetism. They are negatively charged and are located outside the nucleus in the electron cloud. Electrons are also the smallest subatomic particle and have a mass of 9.10938356 x 10-31 kg (0.0005485799 atomic mass units).

To know more about Neutrons visit :

brainly.com/question/31977312

#SPJ11

Answer:

I believe the answer is B. Carbonates

Explanation:

The subscript 4 in [Cu(NH3)4]2+ indicates the B)coordination number of Cu2+.

Coordination number refers to the number of ligands attached to the central metal ion in a coordination complex. In the given complex, Cu2+ is the central metal ion and it is coordinated to four ammonia (NH3) ligands.

The subscript 4 in [Cu(NH3)4]2+ indicates the number of NH3 ligands attached to the Cu2+ ion, which is the coordination number of Cu2+. The oxidation number of Cu in this complex is +2, which is indicated by the Roman numeral II in the formula. Therefore, the correct answer is B.

Answer:

1

False. if they all moved together at any time then it would be a million things withinthe human species all at once at a high rate

Answer:

By forming an activated complex with lower energy.

Explanation:

When catalyst is added to a reaction , it forms  an activated catalyst which has lower activation energy . So initiation of reaction requires less energy and reaction becomes fast .

Hence third option is correct.

A 20.0-liter flask contains a mixture of argon at 0.72 atmosphere and oxygen at 1.65 atmospheres. The total pressure in the flask is 2.37 atm.

The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).

The partial pressures of the gases in a mixture of gases are added to determine the total pressure in the flask. This is the partial pressures law of Dalton.

The total pressure of the gases = P1+P2+P3+..Pn=\(P_{total}\)

Therefore, in the given scenario, the flask's total pressure will be equal to 0.72+1.65 = 2.37 atm. Therefore, when a 20.0-liter flask includes a mixture of argon at 0.72 atmospheres and oxygen at 1.65 atmospheres, the total pressure in the flask is 2.37 atm.

Learn more about pressure:

https://brainly.com/question/28012687

#SPJ4

The answer is the phosphate concentration of \(8.40\times10^{-6}M\)

Calcium phosphate \($\left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\right)$\) is dissociate to form

calciumion \($\left(\mathrm{Ca}^{2+}\right)$\) and phosphate ion \($\left(\mathrm{PO}_{4}^{3-}\right)$\).

\($\mathrm{Ca}_{2}\left(\mathrm{PO}_{4}\right)_{2}(\mathrm{~s}) \longrightarrow 3 \mathrm{Ca}^{2+}(\mathrm{aq})+2 \mathrm{PO}_{4}^{3-}(\mathrm{aq})$\)

Soluability product expression of \($\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}$\) is,

\($K_{s p}=\left[\mathrm{Ca}^{2+}\right]^{3} \times\left[\mathrm{PO}_{4}^{3-}\right]^{2} \longrightarrow (1)\)

given that, somability product \($\left(k_{s p}\right)=8.6 \times 10^{-19}$\)

concentration of \(\mathrm{ca}^{2+}$ ion $=0.0023 \mathrm{M}$\)

putting the value in equation (1) we get,

\($8.6 \times 10^{-19}=(0.0023)^{3} \times\left[\mathrm{PO}_{4}^{3-}\right]^{2}$\)

or, \($\left[\mathrm{PO}_{4}^{3-}\right]^{2}=\frac{8.6 \times 10^{-19}}{(0.0023)^{3}}=7.06 \times 10^{-11}$\)

or, \($\left[\mathrm{PO}_{4}^{3-}\right]=8.40 \times 10^{-6} \mathrm{M}$\)

So the phosphate concentration \($=8.40 \times 10^{-6} \mathrm{M}$\)

What is phosphate concentration ?

So the more about phosphate concentration visit.

https://brainly.com/question/13606926

#SPJ4

Answer:

b is the correct answer

Answer:

b. forest ....

I think ansesters also lived in forest by wearing leaves like their clothes .... etc

Chemical change is classified as spontaneous reaction when the reaction occurs  without the addition of energy.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

Learn more about chemical changes,here:

https://brainly.com/question/23693316

#SPJ1

1. The ionic bond and covalent bond are distinguished from each other based on the way the atoms are attached to each other. Ionic bonds are formed when one or more electrons are transferred from one atom to another, resulting in a cation and an anion attracting each other to form an ionic bond. Ionic bonds are a result of electrostatic attraction between ions with opposite charges. Covalent bonds are formed when atoms share one or more pairs of electrons to achieve stable electronic configurations. Covalent bonds form when two or more atoms share electrons in order to achieve the stable electron configuration of noble gases. In covalent bonding, the electrons are shared between atoms, not transferred.

2. Density is defined as mass per unit volume. The density of sugar in g/cm³ is obtained by dividing its mass by its volume.

Mass of sugar = 500gVolume of sugar = 0.315L

Using the formula for density, we have

Density = Mass/Volume= 500g/0.315

L= 1587.30 g/L1

L = 1000 mL1 mL = 1 cm³

Density = 1587.30 g/L × (1 mL/1 cm³)

Density = 1.5873 g/cm³, to 4 significant figures

3. We can use the formula; Density = Mass/Volume, to calculate the mass of the block of silicon. Volume of block of silicon = 450 m³ Density of silicon = 2.336 g/cm³ Volume of block of silicon = 450 m³ = 4.5 × 10^8 cm³

We can substitute the values into the formula

Density = Mass/Volume

2.336 g/cm³ = Mass/4.5 × 10^8 cm³

Mass = 2.336 g/cm³ × 4.5 × 10^8 cm³

Mass = 1051200000 g or 1.05 × 10^9 g, to 2 significant figures.

Therefore, the mass of the block of silicon is 1.05 × 10^9 g.

To know more about density visit:

https://brainly.com/question/29775886

#SPJ11

To learn the mole concept and standard temperature.

What is standard temperature?

Therefore, 0 degrees Celsius, which translates to 32 degrees Fahrenheit or 273.15 degrees Kelvin, is considered the standard temperature. This is essentially the temperature at which pure water at sea level will freeze when exposed to air at standard pressure.

What is mole?

A mole is a crucial unit of measurement used by chemists. Similar to how having a dozen eggs means you have twelve eggs, having a mole of something indicates that you have 602,214,076,000,000,000,000,000 of that particular thing. Chemists must measure very small objects, such as atoms, molecules, or other particles, using moles.

Therefore there are 0.125 moles of water vapor present.

Learn more about standard temperature from the given link.

https://brainly.com/question/21021354

#SPJ4