If you know about crystals can you tell me if this is real or fake because I purchased this item and don’t know

Answer:

Viruses

Explanation:

Like duh, they can have babies but like they rely on cells, which makes it that they aren't living. Since they are just like they need support and like cells don't like supporting viruses. Kind of like talking to a Chad so like just back off man.

1) First you need to multiply 67.6 by 2, because A₂X has to atoms of A. So:

67.6 × 2 = 135.2

135.2 g is 30.6% of the mass of the compound. So:

135.2 ----- 30.6%

x ----- 100%

x = 441.8 g

Answer: 442g

Answer:

B

Explanation:

A flame test is used to identify an unknown sample by its emission spectrum. The correct answer is option B.

Flame tests are used to identify the presence of certain metal ions in a sample based on the color of the flame that is produced when the sample is heated.

When a metal ion is heated in a flame, it absorbs energy from the flame and becomes excited. As the metal ion returns to its ground state, it releases energy in the form of light, which causes the flame to emit a characteristic color.

The color of the flame is specific to the metal ion that is present and can be used to identify the metal ion based on a color chart.

Therefore option B. "to identify an unknown sample by its emission spectrum" is the correct answer.

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Note: in the International System of Units, The kilogram or kilogramme (symbol: kg) is the base unit of mass.

2nd Note:

1 gram = 0.001 Kilograms

72 kilograms converted to grams is 72,000 grams.

333 grams is 0.333 kilograms.

0.23976 is the pizza percentage.

Rounded: 0.24

Therefore, your answer is 0.24

Answer:

Thomson--atoms cotain electron

Ernest Rutherford--atoms have a positive nucleus

R.A Millikan--electrons have Q=-1

Dalton--atoms are indivisible

Millikan---> Electrons have a charge of -1

Rutherford ---> Atoms have a positive nucleus

Thomson -----> Atoms contain electrons

Dalton --------> Atoms are indivisible

The atomic theory went through several modifications and different scientists proposed various models of the atom until our present conception of the atom was developed.

The atom was first defined as the smallest indivisible particle of a substance. This idea of "indivisibility" of the atom stems from Dalton's theory.

The fact that atoms were composed of negatively charged electrons was proven by the experiments of J.J Thompson using the cathode ray tube. Millikan's charge to mass experiment showed that the electron has a charge of -1.

Rutherford, in his famous gold foil experiment showed that atoms were composed of a positively charged nucleus.

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The acid dissociation constant (Ka) for a monoprotic acid with a percent ionization of 1.45% in a 0.143 M solution is to be determined, expressed to three significant figures.

The percent ionization of an acid is defined as the percentage of the initial concentration of the acid that has dissociated into ions in solution. To calculate the Ka of the acid, we can use the equation for percent ionization:

\(\%Ionization =\frac{concentration\,of\,H+\,ions}{initial\,concentration\,of\, acid} \times 100\)

Since the acid is monoprotic, we can assume that the initial concentration of H+ ions is equal to the initial concentration of the acid. Therefore, we can rewrite the equation as:

\(\%Ionization =\frac{concentration\,of\,H+\,ions}{concentration\,of\, acid} \times 100\)

Substituting the given values, we get:

\(1.45\%=\frac{concentration\,of\,H+\,ions}{0.143M} \times 100\)

Solving for the concentration of H+ ions, we get:

Concentration of \(H+ ions = 1.45\% \times \frac{0.143 M}{100} = 0.00208 M\)

Now, we can use the equation for Ka:

\(Ka = \frac{[H+][A-] }{[HA]}\)

where [H+] is the concentration of H+ ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the undissociated acid. Since the acid is monoprotic, the concentrations of the conjugate base and undissociated acid are equal. Therefore:

\(Ka = \frac{ [H+]^2}{[HA]}\)

Substituting the values we have calculated, we get:

\(Ka = \frac{ (0.00208 M)^2}{(0.143 M - 0.00208 M)} = 1.23 \times x^{-5}\)

Therefore, the Ka for the monoprotic acid is \(1.23\times 10^{-5}\), expressed to three significant figures.

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Acetone is a liquid substance that could be used in the laboratory for dissolving dry mortar on the floor.

Acetone is a commonly used solvent in laboratories due to its ability to dissolve a wide range of substances, including adhesives and resins. It is a volatile and flammable liquid with a low boiling point, making it convenient for cleaning purposes. Acetone is effective in dissolving dried mortar on floors as it can break down the cementitious components and facilitate their removal.

Acetone is a liquid substance that could be used in the laboratory for dissolving dry mortar on the floor.

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Answer:

4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l)

This is an oxidation-reduction (redox) reaction:

4 N-III - 20 e- → 4 NII

(oxidation)

10 O0 + 20 e- → 10 O-II

(reduction)

NH3 is a reducing agent, O2 is an oxidizing agent.

Explanation:

good luck

After three half-lives, 12.5% of the original sample of polonium remains.

Polonium is a very infrequent natural element. It is found in uranium ores but it is careless to extract it. It is obtained by bombarding bismuth-209 with neutrons to give bismuth-210, which then purifies to form polonium. All the industrially produced polonium in the world is made in Russia.Po-210 is an effect of the radioactive decay of uranium-238, which decays to radon-222 and then to polonium. Polonium 210 has a half-life of 138 days. Let the opening value of polonium-218 be 100. First half-life. Therefore, 6.25 % of the original sample remains after 4 half-lives that are 12 minutes. Element Polonium has atomic Number 84, p-block, Mass number is 209.

So we can conclude that polonium is a radioactive, silvery-gray, or black metallic element of the oxygen group in the periodic table.

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The correct statements which are true for the reactions in the Sun are that are fusion reactions and reactions occur because of very high temperatures.

Nuclear fusion reactions are those reactions in which two species reacts with each other for the formation of new specie.

In the core of the sun, nuclear fusion of hydrogen atoms occur for the formation of helium molecules in the presence of high temperature.

Hence, the correct statements are they are fusion reactions and reactions occur because of very high temperatures.

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The change in temperature during a chemical reaction can provide information about whether the reaction is exothermic (releases heat) or endothermic (absorbs heat).

The change in temperature of a chemical reaction is often an important indicator of the energy absorbed or released during the reaction. In this case, we have two different reactions occurring in two separate beakers, with different temperature changes.

In beaker A, the temperature increases from 25 to 40 degrees. This suggests that the reaction in beaker A is exothermic, meaning that it releases heat to the surroundings. The reaction is giving off energy, which is reflected in the temperature increase of the beaker.

In beaker B, the temperature decreases from 25 to 20 degrees. This suggests that the reaction in beaker B is endothermic, meaning that it absorbs heat from the surroundings. The reaction is taking in energy, which is reflected in the temperature decrease of the beaker.

It's worth noting that the temperature change alone is not sufficient to determine the nature of the reaction (i.e. exothermic or endothermic). Other factors, such as the reaction equation and the properties of the reactants and products, must also be considered. However, temperature change can be a useful clue in identifying the energy changes that occur during a chemical reaction.

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Catabolism refers to a process that is associated with energy release in which complex compounds are broken down into simpler molecules.

Catabolism is a metabolic process that involves the breakdown of complex molecules into simpler molecules, typically accompanied by the release of energy. It is the opposite of anabolism, which is the process of building complex molecules from simpler ones.

During catabolism, large molecules such as carbohydrates, proteins, and fats are broken down into smaller units such as glucose, amino acids, and fatty acids, respectively. These smaller molecules can then be further processed and utilized by cells to generate energy or to synthesize other necessary molecules.

The breakdown of complex molecules in catabolism occurs through various biochemical reactions such as hydrolysis, oxidation, and enzymatic degradation. These reactions release energy stored within the chemical bonds of the complex molecules, which can be captured and used by cells for various cellular processes, including muscle contraction, active transport, and synthesis of new molecules.

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Explanation:

pH (Power of Hydrogen) adalah derajat keasaman yang digunakan untuk menyatakan tingkat keasaman atau kebasaan yang dimiliki oleh suatu larutan. Ia didefinisikan sebagai kologaritma aktivitas ion hidrogen (H+) yang terlarut. Koefisien aktivitas ion hidrogen tidak dapat diukur secara eksperimental, sehingga nilainya didasarkan pada perhitungan teoretis. Skala pH bukanlah skala absolut. Ia bersifat relatif terhadap sekumpulan larutan standar yang pH-nya ditentukan berdasarkan persetujuan internasional

Answer: 63.6166 amu (atomic mass units)

Explanation: When an element X is written in the form of X-N, N will the atomic mass of that element. So we have copper with a mass of 63 and 65. We are given percentages of each one. 69.17/100 of the copper atoms will be of weight 63 while 30.83/100 will be of weight 65. Keep in mind that amu does not actually mean weight but I'm just using it as a tool to help explain the general concept. Assume you have 100 copper atoms, and you need to find the average atomic mass for them, if you do this you will solve the problem. Due to the fractions, 69.17 of them will be 63 amu and the rest will be 65. So do 69.17*63+65*30.83 and divide by one hundred. By doing this you will get 63.6166. If my answer doesn't make sense, search up how to calculate weighted averages

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0.0014 atm is the pressure of nitrogen at 20 °C and 730 mm Hg initial pressure when its volume increases from 875 ml to 955 ml

Since the mass of the gas is maintained during the change in volume, the number of moles with the initial volume must first be calculated.

To calculate the moles of gas, the ideal gas equation is used:

PV = nrt

where

P = Pressure

V=Volume

n = moles

T = temperature

R = gas constant

It is cleared n:

n = PV/Rt

n = PV/Rt

Data

P = 730 mmHg = 0.96 atm

V = 875ml = 0.875L

n = ?

T = 20°C = 293.15K

R = 0.082 L atm/mol °K

n = PV/Rt

n = 0.96. 0.875 / 0.082. 293.15

n = 0.84 / 24.03

n = 0.035 moles

Knowing the moles of nitrogen, the new pressure of the gas is calculated after changing its volume.

Data

P = ?

V = 955ml = 0.955L

n = 0.035 moles

T = 20°C = 293.15K

R = 0.082 L atm/mol °K

P = nRt/V

P = 0.035. 0.955 / 0.082. 293.15

P = 0.033 / 24.03

P = 0.0014 atm

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In an IR spectrum of CO2 and H20, a double-beam spectrophotometer with a reference cell can be used to subtract out the interference from the background, solvent or instrument noise and helps to improve the accuracy and precision of IR spectroscopy measurements by eliminating interferences that can affect the quality of data.

Some examples of interferences that can be subtracted by using a double-beam spectrophotometer with a reference cell:

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In the chemical reaction the reactants are oxygen and ethanolc acid while the product are water and carbon dioxide.

In a chemical reaction, reactants are the substances that react with each other to form products.

Therefore, oxygen and ethanoic acid are reactants while carbon dioxide and water are products.In a combustion reaction, a substance is burned in the presence of oxygen, resulting in the release of heat and light.

During this reaction, the oxygen reacts with the substance to produce carbon dioxide and water. In the given reaction, ethanoic acid (CH3COOH) is burned in the presence of oxygen (O2), producing carbon dioxide (CO2) and water (H2O).

Thus, oxygen and ethanoic acid are reactants, while carbon dioxide and water are products.

The combustion reaction of ethanoic acid is shown as follows:

2CH3COOH + 3O2 = 2CO2 + 2H2O + heat and light

This means that for every two molecules of ethanoic acid and three molecules of oxygen that react, two molecules of carbon dioxide and two molecules of water are produced. The heat and light produced are also released.

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The value of k for this aqueous reaction at 298 k a b↽−−⇀c  dδ°=10. 35 KJ/mol is 30.37 mol.

K is the song which is used to donate the equilibrium of a reaction and the equilibrium of the reaction can only be obtained when the concentration of reactant is equal to the concentration of the product.

K is also known as the equilibrium constant.

δG or dδ° = - R T In K

                     R = universal gas constant

                     T = 298 k or 24.4Celciuss

                      dδ°= 10. 35

substituting the value in the equation

10. 35 = - 8.313 ×  24.4 celcius  In k

 In k =  - 8.313 ×  24.4 celcius / 10. 35

 In k = 30.37 mol.

Therefore, the value of k for this aqueous reaction at 298 k a b↽−−⇀c  dδ°=10. 35 KJ/mol is 30.37 mol.

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Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

The molecule that contains 6 atoms comprising a single functional group is Hexanol, under the condition that the given molecule is that of an alcohol.

Its molecules contain 6 carbon atoms. The finishing -ol states an alcohol (the OH functional group), and the hex- stem presents  that there are six carbon atoms in the LCC. The OH group is assembled to the second carbon atom.
Functional groups are considered as specified groups of atoms within molecules that are the reason for characteristic chemical reactions of those molecules . Some examples of functional groups include alcohols, aldehydes, ketones, carboxylic acids, esters, ethers, halogens, amines and amides.
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The complete question
Name a molecule that contains 6 carbon atoms with a single functional group that is an alcohol

Answer:

alkali metals

Explanation:

alkali metals have only 1 electron in their outer shell so it is easier to lose it

In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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The molarity of the oxalic acid solution is 0.3125 M.

First, let's write the balanced equation for the reaction:

\(H_2C_2O_4 + 2NaOH\) ⇒ \(Na_2C_2O_4\) + \(2H_2O\)

From the equation, we can see that one mole of oxalic acid (\(H_2C_2O_4\)) reacts with two moles of NaOH.

Therefore, the number of moles of NaOH used can be calculated using the formula:

moles of NaOH = molarity of NaOH x volume of NaOH (in liters)

= 0.2500 mol/L x 0.02500 L

= 0.00625 mol

Since the stoichiometry of the reaction is 1:1 between \(H_2C_2O_4\) and NaOH, we can conclude that the number of moles of oxalic acid used is also 0.00625 mol.

molarity = moles of solute / volume of solution (in liters)

The volume of the oxalic acid solution is given as 20.00 mL, which is equal to 0.02000 L.

molarity = 0.00625 mol / 0.02000 L

= 0.3125 M

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Answer:

Iron is  element

Explanation:

Answer: element

Explanation: Iron is an element in the periodic table. Nowadays, itis one of the most common elements we use today. The answer is element because iron is an element. It has electrons and protons and atoms.

Hope this helps you!

Answer:

Aluminium (A1) -Used in the production of duralumin alloy for use in the construction of aeroplane bodies. 3. Silicon (Si) -To make microchips 4. Sulphur (S) -To make matches, fireworks and for the manufacture of sulphuric acid 5.

Explanation:

Hope this helped!

Answer:

yes

Explanation:

we use different elements and compounds in our life ex salt and iron but most of the substances found in our environment are mixture btw scientists need to classified substances to work with our substances and to study pure substances hope it helps u

Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

The concentration of NaOH that is used to completely neutralize is 0.25 Liters.

We will calculate the concentration in terms of molarity by using the below formula:

M₁V₁ = M₂V₂, where

M₁ = molarity of H₂SO₄ = 2m

V₁ = volume of H₂SO₄ = 0.25 L

M₂ = molarity of NaOH = ?

V₂ = volume of NaOH = 2 L

On putting all these values on the above equation, we get

M₂ = (2)(0.25) / (2) = 0.25 L

Hence required volume is 0.25 L.

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Answer:

Wavelength, \(\lambda=8.57\times 10^{-8}\ m\)

Explanation:

Given that,

Frequency, \(f=3.5\times 10^{15}\ Hz\)

We need to find the wavelength of a photon of light. The relation between frequency and wavelength is as follows :

\(c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3.5\times 10^{15}}\\\\\lambda=8.57\times 10^{-8}\ m\)

So, the wavelength of the light is \(8.57\times 10^{-8}\ m\).