An analytical chemist has determined by measurements that there are 81. moles of silicon in a sample of talc. how many moles of hydrogen are in the sample? round your answer to 2 significant digits.

After valves are opened and enough time has passed for net movement of particles between containers to stop, pressure of gas in middle container will be closest to 3 atmospheres as pressure will be halved after opening valves.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

Pressure will be halved after opening valves as it will be bifurcated ,thus, 9/2=4.5 which is closest 3 atmospheres.

Thus,the pressure of gas in the middle container will be closest to 3 atmospheres.

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The H3O+ concentration to the correct number of significant figures for solutions with the following pH values is given below:

A) pH = 9.0  [H3O+] = 10^-9.0 = 1.00 x 10^-9B) pH = 7.00  [H3O+] = 10^-7.00 = 1.00 x 10^-7C) pH = -0.30  [H3O+] = 10^0.30 = 1.99 x 10^(-1)D) pH = 15.18  [H3O+] = 10^(-15.18) = 5.46 x 10^(-16)E) pH = 2.63  [H3O+] = 10^(-2.63) = 4.23 x 10^(-3)F) pH = 10.75  [H3O+] = 10^(-10.75) = 1.78 x 10^(-11)

Concentration: In chemistry, the concentration of a solution refers to the amount of solute that is dissolved in a given volume of solvent. It is usually expressed in terms of moles per liter or molarity (M).pH

The pH scale is a measure of the acidity or basicity of a solution. It ranges from 0 to 14, with 7 being neutral, less than 7 being acidic, and greater than 7 being basic. The pH of a solution can be determined using the equation: pH = -log[H3O+].

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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The element whose isotope is represented as  \(_{6}^{14}X\) is carbon -14. The atomic number of carbon is 6 and the mass number for the given isotope is 14 amu.

Isotopes are atoms of same element with different  mass numbers. Isotopes slightly changes in chemical and physical properties between each other.

Almost elements in the periodic table are having isotopes. However not all of them are stable. Some of them for heavy metals are radioactive isotopes and are not stable.

The isotope is represented by showing mass number in top of the symbol and atomic number at the bottom. The atomic number 6 corresponds to carbon. Hence, option A is correct. Carbon -14 isotope is given here.

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Answer:

nucleotides

Explanation:

Hope this helps :D

Answer:

dna is made up of nucleotides!

Explanation:

hope this helped

The question is incomplete, the complete question is:

Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?

Answer: The concentration of borax solution is 0.069 M.

Explanation:

To calculate the concentration of borax solution, the formula used is:

\(n_1C_1V_1=n_2C_2V_2\) ....(1)

where,

\(n_1, C_1\text{ and }V_1\) are the n-factor, concentration and volume of sulfuric acid

\(n_2,C_2\text{ and }V_2\) are the n-factor, concentration and volume of borax solution.

We are given:

\(n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL\)

Putting values in equation 1, we get:

\(1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M\)

Hence, the concentration of borax solution is 0.069 M.

The pOH of the given solution of hydrochloric acid is 3.87.

The given solution of hydrochloric acid has a concentration of 1.34 x 10⁻⁴M.

Now, we are supposed to find the pOH of the given solution.

In order to find the pOH of a given solution, we need to use the following formula:

pOH = -log [OH⁻]

We know that in pure water at 25°C:[OH⁻] = 1.0 x 10⁻⁷ M

Now, in order to find the pOH of a solution, we must first find the concentration of [OH⁻] in the solution.

Let's use the dissociation reaction of HCl to find the [OH-] in the solution:

HCl → H⁺ + Cl-[H⁺] = 1.34 x 10⁻⁴ MOH- + H⁺ → H2₂O

[OH⁻] = 1.0 x 10⁻¹⁴ / [H+]

pOH = -log [OH⁻]

pOH = -log [1.0 x 10⁻¹⁴ / 1.34 x 10⁻⁴]

pOH = -(-3.87)

pOH = 3.87

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A chemical reaction is one in which the bonds are broken within the reactant molecules and new bonds are formed within the product molecules in order to produce a new substance.

The reaction of silver nitrate with hydrochloric acid forms a thick curdy white precipitate of silver chloride. The white precipitate is insoluble in nitric acid but soluble in ammonium hydroxide solution and forms diamine silver (I) chloride.

a) AgNO₃ + HCl → AgCl + HNO₃

b) Complete ionic equation: Ag⁺ (aq) + NO₃⁻ (aq) + H⁺ (aq) + Cl⁻ (aq) = AgCl (s) + H⁺ (aq) + NO₃⁻ (aq)

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The activation energy of the reaction is 40 Kj/mol

Activation energy is the amount of energy required for a chemical reaction to occur. In other words, it's the minimum energy that molecules must possess in order to react with one another. The activation energy can be thought of as the height of a hill that the reactants must climb in order to reach the other side.

The activation energy is a key factor in determining the rate of a chemical reaction. Generally, reactions with higher activation energies occur more slowly than those with lower activation energies.

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Answer:

9.5

Explanation:

that the answer I hope am correct

Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.

For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;

According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode

Phosphoanhydride bond hydrolysis: \(ATP + H2O → ADP + Pi\)

The hydrolysis of a phosphoanhydride bond typically refers to the breaking of the bond in a phosphate group. Here is the balanced equation for the hydrolysis of a phosphoanhydride bond in ATP (adenosine triphosphate):

\(ATP + H2O ⟶  ADP  + Pi\)

In this equation, ATP (adenosine triphosphate) reacts with water (\(H2O\)) to form ADP (adenosine diphosphate) and inorganic phosphate (Pi). The hydrolysis of the phosphoanhydride bond in ATP releases energy that can be used by cells for various biological processes.

Reactants:

Adenosine triphosphate (ATP): \(C10H16N5O13P3\)and Water (\(H2O\))

Products:

adenosine diphosphate and Inorganic phosphate (Pi): \(H3PO4\)

In the reactants, ATP consists of an adenosine molecule (adenine and ribose) linked to three phosphate groups. After hydrolysis, one of the phosphate groups is removed, forming ADP, and releasing inorganic phosphate (Pi).

Overall, the hydrolysis of the phosphoanhydride bond in ATP allows the transfer of energy and conversion of ATP to ADP, which is an essential process in cellular energy metabolism.

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The mass of the water that was formed is 20 g

The law of conservation of mass states that the total mass of substances in a closed system remains constant during a chemical reaction. This means that the mass of the reactants must be equal to the mass of the products.

The law of conservation of mass is a fundamental principle of chemistry and is a cornerstone of our understanding of the behavior of matter and energy in chemical reactions.

The total mass that exploded is 30 grams hence the mass of the water that was formed is;

30 - (15 + 5)

= 20 g

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Answer:

Explanation:

Driving a car (burning gas is a chemical change) and almost all the plastics we use are made by chemical reactions of different components.

The correct net ionic equation for the reaction that takes place between hydrocyanic acid (HCN) and sodium hydroxide (NaOH) is:

HCN (aq) + NaOH (aq) -> NaCN (aq) + H2O (l)

In this equation, HCN acts as a weak acid and donates a proton (H+) to the hydroxide ion (OH-) from NaOH. This results in the formation of water (H2O) and the conjugate base of HCN, which is the cyanide ion (CN-). The sodium ion (Na+) from NaOH combines with the cyanide ion (CN-) to form the soluble salt sodium cyanide (NaCN).

The temperature rise in the mixture indicates an exothermic reaction, which confirms the formation of water as a product. The colorimeter measures the change in light absorbance as a result of the reaction. This can be used to determine the concentration of the reactants and products and their respective molar absorptivities.

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In SO2F2, sulfur forms two bonds with fluorine and two bonds with oxygen, resulting in a tetrahedral shape. Therefore, the linearly connected structure F−O−S−O−F is not found in nature.

Lewis structures of SO2F2:

Sulphur dioxide difluoride (SO2F2) can be represented by several Lewis structures, and resonance structures of SO2F2 must be considered to establish the bond order, molecular geometry, and hybridization.

Sulfur is the central atom in the SO2F2 Lewis structure. The resonance structures of SO2F2 are:

S-O bond in SO2F2The bond angle of SO2F2 is around 120 degrees, which is consistent with the tetrahedral electron pair geometry for the SO2F2 molecule. In SO2F2, the sulfur atom has a hybridization of sp3;

this indicates that sulfur has four hybridized orbitals, which allows sulfur to form four sigma bonds with fluorine (F) and oxygen (O).

SO2F2 Molecule Shape

The linearly connected structure F−O−S−O−F is not found in nature because it is chemically unsound. Although it may appear that the S-O bond length should be greater than the S-F bond length, which should be shorter, experimental evidence shows that this is not the case. The molecule's F and O atoms,

for example, are highly electronegative, making it difficult for sulfur to form a bond with them. Because the electronegativity of fluorine is greater than the electronegativity of oxygen, the sulfur atom is more likely to form a bond with fluorine atoms than with oxygen atoms.

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Answer:

Temperature, mass, and the type of material are factors that affect the thermal energy of an object.

Material with the higher specific heat will have more thermal energy than material with lower specific heat if they both have the same mass and temperature.

The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.

If two materials have the same mass and temperature, the material with the greater specific heat will have more thermal energy than the material with the lower specific heat.

How does thermal energy transfer depend on the kind of material?

The speed at which thermal energy moves from one end of a substance to another determines thermal conductivity. Insulators transport thermal energy slowly while conductors transfer thermal energy quickly.

The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.

Conduction, convection, or radiation are all ways that thermal energy can be moved from one location to another.

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The variables in the ideal gas constant has V as the unit of liters and T has the unit of Kelvin. Thus, option C is correct.

The gas constant in an ideal gas equation has been the value of the energy absorbed by 1 mole of an ideal gas at standard temperature and pressure.

The value of R has been dependent on the units of volume, temperature and pressure of the ideal gas.

The given value of R has been 0.0821 L.atm/mol.K

The unit in gas constant has been L (Liter) for volume (V).

The unit of pressure (P) has been atm.

The unit of temperature (T) has been Kelvin  (K).

Thus the gas law constant used by student has V has the unit of liters and T has the unit of Kelvin. Thus, option C is correct.

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Answer:

a

i just had this

Answer:

A. water entering the plant. thats the one

Explanation:

Answer:

Explanation:

isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

Protons are subatomic particles found within the nucleus of an atom and carry a positive charge. They are fundamental to determining the identity of an element as number of protons uniquely defines an element's atomic number. Different isot element contain the same number of protons.

Isotopes of an element have the same atomic number, which means they possess the same number of protons. This is a fundamental characteristic of all isotopes of a given element. For example, carbon-12, carbon-13, and carbon-14 are isotopes of carbon. They all have 6 protons because carbon's atomic number is 6.

However, isotopes differ in their number of neutrons. Neutrons are electrically neutral subatomic particles also found in the nucleus of an atom. The varying number of neutrons in isotopes results in differences in atomic mass. For example, carbon-12 has 6 neutrons, carbon-13 has 7 neutrons, and carbon-14 has 8 neutrons.

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Answer:

6=100  

Explanation:

Answer:

18 grams of water

Explanation:

The Balance Chemical Reaction is as follow,

                     2 NH₄NO₃    →    2 N₂  +  O₂  +  4 H₂O

According to Equation,

                     160 g (2 moles) NH₄NO₃ produces  =  72 g (4 moles) of H₂O

So,

                     40 g of NH₄NO₃ will produce  =  X g of H₂O

Solving for X,

                     X =  (40 g × 72 g) ÷ 160 g

                     X  =  18 g of H₂O

Hope This Helps!

The formula for the ideal gas law is P*V = n*R*T, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

In this case, we are assuming that the number of moles and temperature are constant. Therefore, we can write:

P1*V1 = P2*V2, where P1 is the original pressure, V1 is the original volume, P2 is the new pressure, and V2 is the new volume.

We can solve for \(P2:P1*V1 = P2*V2P2\)

= P1*V1/V2Now we can substitute in the given values:

\(P1 = 100 psigV1 = 1200 mm³V2 = 2250 mm³P2 = 100 psig * 1200 mm³ / 2250 mm³P2 = 53.33 psig\)

Therefore, the new pressure is 53.33 psig.

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Answer:

10kg

Explanation:

because matter can not be created or destroyed

The mass of the logs were 10 kg before the fire, the mass of the ash, carbon dioxide and water be after the fire is 10 kg because it follows law of conservation of mass.

The law of conservation of mass has given a statement that mass in a isolated system can neither be created nor destroyed in a chemical reaction or by physical transformation.

It can also be stated the mass can neither be created nor destroyed but it can transformed from one form to another form.

Thus, the mass of the logs were 10 kg before the fire, the mass of the ash, carbon dioxide and water be after the fire is 10 kg because it follows law of conservation of mass.

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Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.

The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.

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The rate of effusion of ammonia (NH₃) in the same apparatus is 63.3 cm/min

This states that the rate of diffusion of a gas is inversely proportional to the square root of the molar mass i.e

R ∝ 1/ √M

R₁/R₂ = √(M₂/M₁)

R₁/R₂ = √(M₂/M₁)

43.2 / R₂ = √(17 / 36.5)

Cross multiply

43.2 = R₂ × √(17 / 36.5)

Divide both side by √(17 / 36.5)

R₂ = 43.2 / √(17 / 36.5)

R₂ = 63.3 cm/min

Thus, the rate of effusion of ammonia is 63.3 cm/min

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{2.4 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.398671096...\)

We have the final answer as

Hope this helps you

The statement which accounts for the change in potential energy going from Point B to Point A is that as the atoms get closer together, the attraction of the nucleus of each atom for the electron(s) of the other gets stronger and stronger and is denoted as option B.

This is referred to as the energy possessed by a body by virtue of its position.

The change in the potential energy is as a result of the atoms getting closer which leads to the attraction of the nucleus of the electron of the other getting stronger.

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