0.116 m koh solution was used to titrate a 30.10 ml sample of a weak acid solution, hc3h5o2, of unknown concentration. 49.66 ml of base was added to reach the equivalence point. calculate the original concentration of the acid in molarity.

Answer:

it is because of Dark Matter

Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).

Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.

Explanation:

Hope It helps

Have A Nice Day : )

A group of scientists is studying observable matter in a cluster of galaxies. The duster remains intact due to the gravitational pull.

A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together.

Dark matter is a component of the universe whose gravitational pull can be detected rather than its luminosity. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and “regular” visible matter (0.5 percent).

Since dark matter is made up of particles that do not absorb, reflect, or emit light, it is impossible to identify it through electromagnetic radiation observation. Dark matter is a substance that cannot be directly observed.

Therefore, a team of researchers is examining the material that can be seen in a clump of galaxies. Due to the gravitational force, the duster is unharmed.

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Answer:

See answer below

Explanation:

In this case, you just need to use any acid you want (Like HCl, or H₂SO₄) to do this exercise.

You are given a sample of what you have to do which is:

Acid + metal ------> Salt + hydrogen

As you can see, an acid like the ones I wrote above, have hydrogen atoms, so you should put the hydrogen there. As for the part of salt, you just need to draw the corresponding salt that is formed when the acid reacts with the metal, and write it's name.

Let's do all three equations for you to a better understanding. For all the given examples, I will use HCl as acid, and i will explain one reaction cause the other two reactions happens the same thing, only with a different metal.

1. 2HCl + Zn ------> ZnCl₂ + H₂

As you can see, we just have a displacement reaction where the metal displaces the position of the hydrogen to form the salt and the hydrogen leaves the molecule as a gaseous molecule. Written in words it would be:

Hydrochloric acid + Zinc ----> Zinc chloride + hydrogen

2. 2HCl + Pb -------> PbCl₂ + H₂

Hydrochloric acid + lead ------> Lead (II) chloride + hydrogen

3. 2HCl + Fe -------> FeCl₂ + H₂

Hydrochloric acid + iron ------> Iron (II) chloride + hydrogen

Hope this helps

Answer:

1.2 mol N2 = 26.88 L

3 mol H2 =  67.2 L

0.5 mol CO2 = 11.2 L

10.3 L NO2 = 0.46 moles

67.2 L SO2 = 67.2 / 22.4 = 3 moles

89.6 L NO = 89.6 /22.4 = 4 moles

44.8 L NO2  = 92 grams

201.6 L H2 = 18 g

65 grams CO = 51.9 L

152 grams F2  = 89.6 L

Explanation:

1 mole of a gas occupies a volume of 22.4 L

(N = 14, O = 16, C = 12, H = 1, F = 19)

1.2 mol N2= 1.2 * 22.4 L = 26.88 L

3 mol H2 = 3 * 22.4 L = 67.2 L

0.5 mol CO2 = 0.5 * 22.4  L = 11.2 L

10.3 L NO2 =  10.3 / 22.4 L = 0.46 moles

67.2 L SO2 = 67.2 / 22.4 = 3 moles

89.6 L NO = 89.6 /22.4 = 4 moles

1 mole or 22.4 L of NO₂ has a mass of 46 g

44.8 L NO2 = (44.8 /22.4) * 46 grams = 92 grams

1 mole or 22.4 L of H₂ has a mass of 2 g

201.6 L H2 = (201.6 / 22.4) * 2 grams = 18 g

1 mole or 22.4 L of CO has a mass of 28 g

65 grams CO = 65/28 * 22.4 L = 51.9 L

1 mole of F₂ has a mass of 38 grams

152 grams F2 = 152/38 * 22.4 L = 89.6 L

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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1) A formula unit represents the simplest ratio of elements in a (crystal) of an ionic compound.

2) A crystal is made up of: many atoms that are arranged in a regular pattern

3) There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is: 1:1

The proportional proportions of the cations and anions affect the structure of an ionic compound. Salts, oxides, hydroxides, sulfides, and the vast bulk of inorganic compounds are examples of ionic compounds. The electrostatic pull between the positive and negative ions holds together ionic solids.

For instance, sodium ions attract chloride ions, and chloride ions attract sodium ions. Na+ and Cl- ions are arranged alternately to form a three-dimensional framework. This particle is made of sodium chloride. Because there are as many sodium ions as there are chloride ions, the diamond is uncharged. The ions are held in the formations by the forces of attraction between them.

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Answer:

Explanation:

Select the word or phrase from the drop-down menu to describe ionic compounds.

A formula unit represents the simplest ratio of elements in a : ✔ crystal. of an ionic compound.

A crystal is made up of : ✔ many atoms that are arranged in a regular pattern.

There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is : ✔ 1:1.

Answer:

2000\(cm^{3}\)

Explanation:

So the equation of volume of a rectangular solid is:

V= l * w * h

Where l is length w is width and h is height

To find the volume:

V= 40 * 10 * 5

V= 400 * 5 ( multiply 40 and 10 to get 400)

V= 2000 \(cm^{3}\) ( multiply 400 and 5 to get 2000)

The unit for volume is \(cm^{3}\) in this case.

HOPE THIS HELPED

the chemist can report that the molar heat capacity of  \(C_{3} H_{9}N\)  is 134.0 J/mol·K (rounded to three significant digits).

To calculate the molar heat capacity of  \(C_{3} H_{9}N\) , we need to know the number of moles of  \(C_{3} H_{9}N\)  in the sample and the amount of heat absorbed by the sample. We can use the following formula to calculate the number of moles of  \(C_{3} H_{9}N\)

n = m/M

where:

n = number of moles

m = mass of \(C_{3} H_{9}N\) (809.0 mg)

M = molar mass of  \(C_{3} H_{9}N\)

The molar mass of \(C_{3} H_{9}N\)  can be calculated as follows:

M = (3 x M(C)) + (9 x M(H)) + M(N)

Using the atomic masses of the elements from the periodic table, we can calculate the molar mass of  \(C_{3} H_{9}N\)  as follows:

M(C) = 12.01 g/mol

M(H) = 1.008 g/mol

M(N) = 14.01 g/mol

M = (3 x 12.01) + (9 x 1.008) + 14.01 = 59.11 g/mol

Now we can calculate the number of moles of  \(C_{3} H_{9}N\)

n = 809.0 mg / 59.11 g/mol = 0.01368 mol

Next, we can use the following formula to calculate the molar heat capacity of  \(C_{3} H_{9}N\)

Cp = q/nΔT

We are given that q = 1834 J and we need to assume a value for ΔT. Let's assume that the temperature of the sample increased by 10.0°C (which is equivalent to 10.0 K). Then we can calculate the molar heat capacity of  \(C_{3} H_{9}N\) as follows:

Cp = 1834 J / (0.01368 mol x 10.0 K) = 134.0 J/mol·K

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The four polymers that can be used to give the same effect as xanthan gum are guar gum, locust bean gum, carrageenan, and carboxy methyl cellulose. Among these, guar gum could give high viscosity and lower flocculation.

Polymers are the macromolecules made up of monomers bonded together. These polymers are widely used in various applications due to their diverse properties such as high viscosity, high tensile strength, flexibility, transparency, and many more. Xanthan gum is one of the commonly used polymers that are used as a thickener, emulsifier, and stabilizer in various industries such as food, pharmaceuticals, cosmetics, and many more. Xanthan gum is derived from the bacterial fermentation process, but it is relatively expensive.

Carboxymethylcellulose: Carboxymethylcellulose is a synthetic polymer made by reacting cellulose with chloroacetic acid. It is used as a thickener and stabilizer in various food and cosmetic applications. It has high viscosity and excellent water-binding capacity, making it an ideal alternative to xanthan gum.Out of these four polymers, guar gum could give high viscosity and lower flocculation.

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Action potentials B and C are formed due to the conduction of the action potentials along the neurons, even though they were initiated at different distances. Therefore, the correct answer is (D): A=leak channels and B=voltage-gated channels.

An action potential is a short-lived event in which the electrical potential of a neuron, muscle cell, or gland cell increases briefly, subsequently returning to its resting level.

Their occurrences may be caused by various signals, including changes in voltage, pressure, mechanical stretch, or neurotransmitter chemicals, and they may propagate rapidly across long distances.

The opening and closing of specific ion channels are responsible for action potential generation and propagation. Voltage-gated ion channels, such as those for sodium and potassium ions, are the most significant of these channels, but other channels, such as leak channels, are also essential.

Leaks channels are ion channels that, when open, allow ions to move through them at a constant, passive rate. When voltage-gated channels are activated, they allow ions to pass through the cell membrane by opening the gates.

Therefore, statement D is correct, where A represents leak channels and B represents voltage-gated channels.

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Answer:

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Answer:

all of the above

Explanation:

chlorophyll in found in virtually all photosynthetic organisms

The answers are given below as ,

a. There are 12 moles of oxygen are in one mole of iron (III) sulfate .

b. There are three atoms of sulfur are in on formula unit of iron (III) sulfate .

c. There are  two iron atoms are in one mole of iron (III) sulfate .

d. The average mass in amu's of one formula unit of iron (III) sulfate one formula unit of iron (III) sulfate .

e. The molecular mass of one mole of iron (III) sulfate is 399.88 g/mol

The average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore,  the other ions that are not attracted to the electrodes form salt.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Positive ions are attracted towards negative electrode and negative ions are attracted toward positive electrodes. the ions which are not attracted to either of the electrode, these form salt with the other ion remaining in the electrolyte.

Therefore,  the other ions that are not attracted to the electrodes form salt.

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In the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.

Bicarbonate is an excellent buffering system because this compound can bind free hydrogen ions (H+) and thus the system avoids sudden changes in the pH of a solution.

In conclusion, in the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.

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Answer:

boiling point

Explanation:

pls mark brainliest <3

Al + Fe₂O3 → 2 Fe + Al₂O3 is a replacement  balanced equations.

2 Ag+S → Ag₂S - synthesis equation

CaCO3 → CaO + CO2​- decomposition equation

balance equation for the reactants and products are necessary to balance chemical equations.

Because a chemical equation must adhere to the principles of mass conservation and constant ratios, the same amount of atoms of each element must be present on two of the reactant and product sides of the equation.

The reactants and products of a chemical reaction are symbolically expressed in chemical equations using the appropriate chemical formulae. The portion of the chemical equation that is on the reactant side is to the left of the sign "," and to the right of the arrow symbol, respectively.

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Answer:

A. Weathering breaks down rocks; Deposition leaves them in new places.

Explanation:

Weathering is basically the complete process of rocks breaking apart.  In contrast, deposition is when the rocks are moved and carried away from their original place and put in new locations.

Answer:

a

Explanation:

Moles of hydronium (H₃O⁺) : 2.5 x 10⁻⁴

Given

pH = 4.3

V sample = 5 L

Required

moles of H₃O⁺(hydronium)

Solution

pH = - log [H₃O⁺]

4.3 = - log [H₃O⁺]

\(\tt [H_3O^+]=10^{-4.3}~M=10^{-4.3}mol/L\)

Moles of hydronium for 5 L sample :

\(\tt 5~L\times 10^{-4.3}mol/L=5.10^{-4.3}moles=2.5\times 10^{-4}~moles\)

Answer:

chemical stability is important to consider in the comprehensive assessment of pharmaceutical properties, activity, and selectivity during drug discovery.

Answer:

In general, molecules are stable because all their constituent atoms have sufficient "valence" electrons-that is, electrons that participate in chemical bonding. Such electrons reside in the outer, or valence, "shell," which must fill up with the appropriate number of electrons for the bound atoms to be come stable.

Explanation:

C, A, A, B, D. Hope this is correct! Have an awesome day!

Answer:

Do you need help still.........

Explanation:

Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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The gas with the highest root mean square (rms) velocity among the given options is H2 at 398 K. At higher temperatures, the rms velocity of gas molecules increases due to the greater thermal energy they possess.

The root mean square velocity of gas molecules is directly proportional to the square root of their temperature. As the temperature of a gas increases, the kinetic energy of the molecules also increases. This results in higher molecular speeds and greater rms velocities. Since H2 at 398 K has a higher temperature compared to H2 at 298 K and He at both temperatures, it will have the highest rms velocity among the options provided.

It's important to note that the rms velocity is influenced by the mass and temperature of the gas. Lighter molecules like H2 will generally have higher rms velocities compared to heavier molecules at the same temperature.

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The mass of Be(NO₃)₂ needed to have precisely 0.670 mole of the compound is 89.11 grams

0.670 moles of beryllium nitrate, Be(NO₃)₂ is needed for the chemical reaction. The mass of Be(NO₃)₂ needed to have precisely 0.670 moles of the compound can be calculated as follows:

Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.

molecular mass of Be(NO₃)₂  = 9 + 14(2) + 16(6) = 9 + 28 + 96 = 133 grams per mole

Therefore,

1 mole of Be(NO₃)₂ = 133 grams

0.670 moles = ?

cross multiply

mass required = 0.670 × 133

mass of Be(NO₃)₂ required = 89.11 grams

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Answer:

Weather is the state in which a certain part inside the atmosphere is hot or cold.Climate is the usual weather in a certain place in the world or atmosphere.One way weather can affect climate is global warming,which is when the world gets hotter and the ice in the world melts and water rises.

Explanation:

climate can be defined as the long-term weather.

The question gives us the reaction to produce sodium sulfide (Na2S) from sodium sulfate (Na2SO4) and carbon (C) and provides the amount of reactants used (15.0 g of Na2SO4 and 7.50 g of C), asking the limiting reactant, the excess reactant and the amount of Na2S produced.

I) The first step for this type of question is checking if the given equation is balanced. For this case, we don't need to adjust the coefficients as the equation is already balanced.

II) Next, we need to calculate the molar mass of the compounds we'll be using. To calculate the molar mass, I'll be using the following atomic masses and considering the number of each atom in the molecules:

Na: 22.99 u

S: 32.07 u

O: 15.99 u

C: 12.01 u

Now, we can calculate the molar mass of Na2SO4, C and Na2S:

Na2SO4: molar mass = (2 * 22.99) + (1 * 32.07) + (4 * 15.99) = 142.01 g/mol

C: molar mass = (1 * 12.01) = 12.01 g/mol

Na2S: molar mass = (2 * 22.99) + (1 * 32.07) = 78.05 g/mol

iii) The third step is to convert the masses given for Na2SO4 and C into the correspondent number of moles using the molar mass of these compounds:

IV) On the forth step, we must define the limiting reactant for this reaction considering the amounts used of each one and the stoichiometric coefficients:

1 mol Na2SO4 reacts with 1 mol C

0.106 mol Na2SO4 reacts with...?

Solving this calculation, we have that we would need 0.106 mol of C to react with 15.0 g of Na2SO4. Since we there are 0.624 mol of C available to react, we can conclude that carbon is the reactant in excess (there is an excess of 0.518 mol) and sodium sulfate is the limiting reactant.

V) At last, we can calculate the amount of Na2S produced from the limiting reactant amount used (0.106 mol of Na2SO4) and the stoichiometric coefficients:

1 mol Na2SO4 ----------1 mol Na2S

0.106 mol Na2SO4 ---- y

Solving for y, we have that 0.106 mol of Na2S will be produced.

vWe can convert this amount into mass of Na2S using its molar mass:

In summary:

Na2SO4 is the limiting reactant and there is an excess of 0.518 mol or 6.22 g of C;

8.27 g of Na2S will be produced from 15.0 g of Na2SO4.

Answer:

A Dendrologist! They are the type of Scientist that studie trees.

Answer:

1 grams Hydrogen is equal to 0.992122546977 mole.

Explanation:

Hydrogen is equal to 0.992122546977 mole.

Answer:

Chopping wood logs

A pot of water o a grate over a burning fire

Explanation:

Physical change is easily reversible. Burning/combustion is a chemical process where substances react rapidly with oxygen: this is usually irreversible.

The marshmallow, roasted food and burned wood all undergo combustion and hence are tagged chemical changes.

Explanation:

Answer:

Chopping Wood and Heating Water

Explanation:

Edgen

The rate of diffusion mainly depends upon several factors like, pressure, and molecular weight. Both nitrogen gas and carbon monoxide are almost identical because of their diatomic molecules.

The molecular weight and atomic structure are almost identical in nitrogen gas and carbon monoxide at the same temperature. They also behave similarly properties at that particular temperature.

Due to their diatomic molecular structure, the rate of dispersal of gas is proportionate to the square root of its molecular mass.  Nitrogen has two nitrogen atoms in the valence shell and carbon monoxide consists of one carbon atom and one oxygen atom.

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