A student performed the following steps in an investigation:


1. Add a few drops of red food coloring to 50 mL of water in a beaker.


2. Stir the contents of the beaker using a glass stir rod.


3. Add 20 mL of yellow vegetable oil.


4. Stir the contents of the beaker using a glass stir rod.


5. Leave the beaker undisturbed for 24 hours.


Which of the following statements about the investigation is most accurate?

A The student made a compound out of pure substances and then made a homogeneous mixture.The student made a compound out of pure substances and then made a homogeneous mixture.
B The student made a solution and then a heterogeneous mixture.The student made a solution and then a heterogeneous mixture.
C The student made a homogeneous mixture and then made a pure substance through a chemical reaction.The student made a homogeneous mixture and then made a pure substance through a chemical reaction.
D The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.

When 5.86 moles of NaN3(Sodium Azide) is given then no. of moles of Na produced is 5.86 mol.

The inorganic substance with the formula NaN3 is sodium azide. The gas-forming element in older automotive airbag systems is this colourless salt. It is utilised to make additional azide chemicals. It is an ionic chemical that is exceedingly water soluble and extremely dangerous.

Na is the chemical formula used for the element having atomic number 11 and called as Sodium

Acc. to the given data following is the reaction occurring

2NaN3→2Na+3N2

Now to calculate the no. of moles of  Na

Multiply the given moles of sodium azide(NaN3) by the mole ratio between NaN3 and N2 from the balanced equation, with Na in the numerator. 2 mol Na:3 mol N2

5.86 molNaN3×2mol Na/2mol NaN3=5.86 mol Na

Hence, when 5.86 moles of NaN3(Sodium Azide) is given then no. of moles of Na produced is 5.86 mol.

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The correct responses that describe the various rules in the filling of orbitals are;

1) Aufbau principle

2) Pauli exclusion principle

3)  Hund's rule.

The orbital has to do with the region in space where there is a high probability of finding the electron. We have to know that that looking at the orbitals, we can know how electrons are arranged in the atoms in order of increasing energy.

The Aufbau principle shows us that when we try to fill the electrons into orbitals, we must start from the orbital that has the lowest energy. The Pauli exclusion principle states that no two electrons in an atom can have the same value for all the four quantum numbers. In other words, electrons in the same orbital must have anti parallel spins.

Also, when we are filling electrons into orbitals that have the same energy, we fill them in singly first. This is the statement of the Hund's rule.

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12 moles of H₂ need to produce 8 moles of NH3 if you have plenty of N₂ .

What is a chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are  part of technology, culture, life . Fuel combustion, glass and pottery making, beer , and wine and cheese making are few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.

The balanced chemical equation is:

N2+3H2→2NH3

From stoichiometry,

2 mol of NH3

is produced from 3 mol of H2

8 mol of NH3 will be produced from = 3/2×8=12 mol of H2

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Answer:

2× Ar(O) + Ar(H) ×2 =58,3197 g/mol

Subtract the initial mass from final mass, i.e., vm.

Answer:

each chlorine atom will lose one electron

Answer: molecular equation

Explanation:

The element could be X is phosporus .

What is element?

An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the  mathematics, an element is the  distinct piece of a larger system or set.

Sol-An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the elememts expands the octet, do it must be in the 3rd period or higher.

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26.21g NaNO₂ is added to it to make a buffer with a pH of 3.46.

A buffer solution's pH will not change when a small amount of an acid or an alkali is added.

A buffer solution that is acidic has a pH lower than 7, to put it simply. Acidic buffer solutions are usually made by mixing a weak acid with one of its salts, usually sodium salt.

A buffer solution with an alkaline pH exceeds 7. Alkaline buffer solutions are often made by mixing a weak base with one of its salts.

moles of HNO₂ = 24.52g HNO₂ ×[tex]\frac{1 mol HNO2}{47.013gHNO2}[/tex]

moles of HNO₂ = 0.33 moles HNO₂

pKa for HNO₂,  

pKa = -log(Ka)

pKa = -log(4.0 × 10⁻⁴)

pKa = 3.39

Now, By using the Henderson-Hasselbach equation: determine the moles of NaNO₂.

Hence, both compounds (Weak base and acid) have same volume.

also use moles instead of concentrations:

pH = pKa + log ( [tex]\frac{moles NaNO2}{moles HNO2}[/tex])

moles of NaNO₂ = moles of HNO₂ × 10[tex]^{pH-pKa}[/tex]

moles of NaNO₂ = 0.33 moles × 10³°4⁶⁻³°³⁹

moles of NaNO₂ = 0.38 moles

moles of NaNO₂ to grams of NaNO₂,

= 0.38 × (68.99/1)

= 26.21g NaNO₂

amount of NaNO₂ is 26.21g.

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When energy depleted elements associated with a proton are accepted by an organic molecule the process is called Fermentation.

Fermentation is a metabolic process that causes a chemical change inside body by the actions of enzymes.

The main purpose of fermentation is to generate NAD+ and 32 ATP in the presence of oxygen.

Fermentation allows cells to survive without using ATP.

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They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair.

This is referred to as the study of different types of shapes, figures and sizes and is used in various fields such as mathematics, chemistry etc.

In the field of chemistry, there are different types such as trigonal planar and the bent geometry which are related as a result of some shared characteristics which include the following in the subsequent paragraph.

They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair and is therefore the correct choice in this scenario.

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Among the above given element pairs none of them are likely to form ionic compounds

Ionic bonds are basically the electrostatic attractions formed between oppositely charged ions in an ionic compound. Generally ionic bonds are often formed when electrons are transferred from metal atom to a non metal atom.

We can say that ionic bond is most likely formed between  metal and nonmetal elements .

In the above given electron pairs none of the pairs given are likely to form ionic compounds as none of the pair is of a metal and a nonmetal. An element can be classified  as a metal if its found on the left side of the periodic table while non metals are located on the right of the periodic table.

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The strength of the bond describes how closely each atom is connected to another atom and how much energy is required to break that connection. The bond length is the average distance between the two atomic nuclei of two molecules that are joined together.

The strength of the bond indicates how strongly each atom is bound to another and how much energy is expended in doing so. The force that a chemical bond utilizes to hold two atoms together is known as bond strength. The amount of energy required to break the bond is expressed in terms of the kilocalories per mole.

The equilibrium separation between the nuclei of two bound atoms in a molecule is referred to as the bond length. The bond length increases with increasing atom size. Bond multiplicity cause decrease in bond length. Rotational spectroscopy, X-ray diffraction, and other methods are used to measure it.

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The wavelengths of light that can break the Cl-Cl bond and the bond in O₂ will be λ = 3.53 × 10⁻⁷ m and λ =2.4 × 10⁻⁷ m respectively.

Cl-Cl- Bond energy (E)= 339 KJ/mol

O=O Bond energy (E)= 498 KJ/mol

h = 6.626 × 10⁻³⁴ J.s

c = 3 × 10⁸ m/s

N = 6.02214076 × 10²³

For Cl-Cl bond

  We will use the following formulae

     λ = Nhc/E (for one mol photons)

  Put the values

λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (339 × 10³ J/mol)] × 1 nm / 10⁻⁹ m

    λ = 353 nm

    λ = 3.53 × 10⁻⁷ m

For O=O bond

  We will use the following formulae

     λ = Nhc/E (for one mol photons)

  Put the values

λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (498 × 10³ J/mol)] × 1 nm / 10⁻⁹ m

    λ = 240 nm

    λ = 2.40 × 10⁻⁷ m

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The answers that are true in regards to the scenario above is:

So, the first and second options are correct. The third and last option is incorrect.

A community is described as a social unit with commonality such as place, norms, religion, values, customs, or identity.

From the scenario above, we can conclude the following:

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The original pH of the gastric juice sample is 3.43

pH serves as a measure to calculate the acidity/alkalinity of a solution. It's ranges is between 0 - 14, with 7 being neutral. A pH below 7 indicates acidity and a pH above 7 indicates basicity. pH is actually a measure of the relative amounts of free hydrogen and hydroxyl ions in water.

As we know:

M₁V₁ = M₂V₂

For the given question:

M₁ = Concentration of gastric juice

V₁ = Volume of gastric juice (20 ml)

M₂ =  Concentration of NaOH (0.0011 M)

V₂ = Volume of NaOH (6.7 ml)

So, M₁ = M₂V₂ / V₁

M₁ = 0.0011 × 6.7/20

M₁ = 0.000365

For pH:

pH = -log [H⁺]

pH = -log [0.000365]

pH = 3.43

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Answer:

The chemical symbol for Magnesium is Mg

Explanation:

As you can see on the periodic table Magnesium is in group two and has the element symbol of Mg

Hope this helps, have a great day!

The pOH of this solution is 0.3 and the pH of the solution is 13.3 .

What is pH ?

The pH of a food is a direct function of the free hydrogen ions present in that food. Acids in food release free hydrogen ions. Hydrogen ions give acidic foods their characteristic sour taste. Therefore, pH can be defined as a measure of free acid. More specifically, pH is defined as the negative logarithm of hydrogen ion concentration. The pH range is 0 to 14. The pH of pure water is exactly 7, so pH 7 is neutral. Values ​​less than 7 are acidic. Values ​​above 7 are basic or basic.

Foods are generally classified as “acidic foods” (low pH, pH 4.6 or less) or “weakly acidic foods” (high pH, ​​pH 4.6 or higher). Safe food storage is determined by the pH of the food. Acidic foods such as fruit and pickles can be safely canned in a tin can with a hot water bath. A combination of acid and hot water (212°F) destroys perishable organisms such as mold and yeast. Proper cooking water canning processes are important to prevent the growth of acid-tolerant molds and yeasts that can lead to elevated pH levels. The pH of borderline foods such as figs and tomatoes can easily exceed 4.6, so lemon juice or citric acid should be added before canning with boiling water. Low-acid foods such as vegetables and meat should be processed in a pressure preserver for safety.

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The compound  [tex]CCl_{4}[/tex] contains polar covalent bonds having partial negative charges on the Cl atoms.

So, the correct option is B.

The four polar covalent bonds between carbon and chlorine in carbon tetrachloride ( [tex]CCl_{4}[/tex]) give it its name as a covalent compound. Due to the variation in atoms' values of electronegativity, the bonds in this compound are polar. The molecule is asymmetrical, which means that the opposing opposite forces balance each other out, and as a result, the molecule is not polar.

The four bonds have symmetry and are spread out in four different directions. In each order, the dipole moments are thus canceled out. Tetrachlorocarbon is a non-polar molecule as a result. Although the electronegativities of C and Cl are different, the carbon tetrachloride molecule has no dipole moment.

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The molecules of isopropyl alcohol do not stick collectively as strongly at room temperature as water molecules do, because of this the alcohol evaporates more quickly than water does.

DNA isn't soluble in ethanol, consequently, it will clump collectively and come to be visible. The colder the ethanol, the less soluble the DNA can be in it, which is why it's far critical for the ethanol to be kept bloodless.

Isopropyl Alcohol may also shape an ignitable vapor/air combination in closed tanks or boxes. Isopropyl Alcohol can react with AIR and OXYGEN over the years to shape unstable peroxides which can explode. Isopropyl Alcohol forms explosive combos, whilst heated, with ALUMINUM.

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Answer:

physical change

Explanation:

bcoz we make salad with raw vegetables and fruits

The salad is a physical change.

Making a fruit salad with raw fruits is a physical change because in this process chemical composition of fruits is not changed.

Telling the difference between a chemical change and a physical change seems trickier than it is. The main difference between a chemical change and a physical change is what happens to a substance’s composition. Here are the basic definitions of chemical and physical changes:

chemical change – a process in which chemical bonds are broken or created to make a new substance

physical change – a process in which a substance changes its state of matter, but chemical bonds stay intact

When matter undergoes a chemical change, it can’t return to its original state without additional reactions. But when it undergoes a physical change, it only needs to return to its original state of matter. The molecules of the substance haven’t been changed at all.

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336 ml of the 11.9 m solution of NaOH do i need to make 2 liters of the 2.00 m NaOH solution

What is Chemical reaction ?

Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day. In nature, chemical reactions can be much more difficult to control and in some cases much more complex than in the laboratory, and generally occur whether you want it or not!In the woods A raging fire, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of fruit on a tree, the transformation of various chemicals, etc... (reactants ) into another group of substances (products) is a so-called chemical reaction.

use M1V1=M2V2

V1 = M2V2/M1 = 336 ml .

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2,726.28 mL solution of propyl alcohol is required to make a 9.17% (v/v) aqueous solution in a 250. ml.

A solution's volume-by-volume percent concentration,

9.17% v/v is a measure of how many milliliters of solute it contains in 100 mL of solution.

In this case,  

9.17% v/v solution will contain -

9.17 mL of solute for every 100 mL of solution.

This means that in order to have propyl alcohol required to make a 9.17% (v/v) aqueous solution in 250 ml  of solute, you need to have

250 mL solute× 100 mL solution/ 9.17mL solute

=2,726.28 mL solution.

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The wavelength of a radio wave having a frequency is 0.8m.

Radio waves are the longest waves in the electromagnetic spectrum. These waves are a form of electromagnetic radiation with frequencies ranging from 300 GHz to 3 kHz, but above 3 GHz are defined as microwaves. Wave frequency is the number of waves passing through a fixed point in a given time.

calculation:-

frequency = 3.75 x 10^7 Hz?

f = wavelength / speed of light

wavelength = c/f

= 3 × 10^8 / 3.75 x 10^7 Hz

= 0.8 m.

Frequency is the rate at which the current changes direction per second. It is measured in hertz an international unit of measurement where one hertz equals one cycle per second. To calculate the frequency of a wave, divide the velocity of the wave by the wavelength. Write your answer in Hertz or Hz which is the unit for frequency. If you need to calculate the frequency from the time it takes to complete a wave cycle or T the frequency will be the inverse of the time or 1 divided by T.

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same number of protons but different numbers of neutrons.

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

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Option-(b) Phenol and alcohol could be separated by chemically active extraction.

In the chemically active extraction ,the compounds are treated with an acid or a base to alter their chemical structure. There are 3 types of chemical extraction. liquid-liquid, liquid-solid and acid base extraction. Acid-base extraction is known as a chemically active extraction.

A phenol is a weak acid.it can lose hydrogen ion when dissolved in water. alcohol is both acid and a base.it reacts with a strong base. The Oxygen atom makes alcohol a base. phenol and alcohol treated with DNA in the process of active extraction.

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The ph of a solution obtained by dissolving two extra-strength aspirin tablets is 8.

The Concentration of solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

Calculation:-

volume = 300 ml = 0.3 L

mass = 450 mg

molar mass  C₉H₈O₄ = 180

mole = mass / molar mass

       =  450/180

      = 2.5 mol

Concentration = mole/volume

                         = 2.5 /0.3

                         =   8.33

PH = - llog[H+]

     = 8.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

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1. Marie could test if the beads she collected were metals by seeing if they conducted electricity or by adding it to a dilute acid to see if hydrogen gas is evolved.

2. Since the reaction involved a metallic oxide, lead oxide, the metal would most probably be Lead.

3. The element that is combined with carbon in carbon dioxide is oxygen.

4. The element oxygen in this experiment comes from lead oxide.

5. Marie should wear goggles as a piece of safety equipment in this experiment.

Metals are shiny hard substances that form positive ions by the loss o electrons.

Some properties of metals include;

Lead is an example of metal whereas lead oxide is a compound of lead and oxygen.

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The structure the arrow is pointing to is the nucleus and it helps store genetic material (DNA) in living cells.

Organelle is a specialized structure found inside cells that carries out a specific life process. examples are ribosomes, vacuoles, nucleus etc.

The nucleus is the large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.

The nucleus is located at the center of living cells and it functions to store genetic material called DNA. The DNA is transferred to offsprings for inheritance of traits.

According to this question, a microscopic image of a cell is shown. The arrow pointed to the nucleus of the cell.

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