What is different about atoms after a redox reaction has happened?
A. They have changed physical states.
B. Their oxidation states have changed.
C. The number of protons has changed.
D. They have higher electronegativities.
SUBMIT

Answer:

35.54g/mole

Explanation:

using the formula PV=nRT will allow you to solve for n which is the number of moles.  R is a constant and you should use 62.3637 L mmhg/mol K.

In order to make sure your units match you have to convert the 118ml of gas to .118L and temperature needs to be converted to Kelvin.  32C + 273=305K

now you can use the formula to solve for n = number of moles  once you get that number you will need to divide that by .161g.  Molar mass is g/moles

Answer:

When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. The production of a gas is also an indication that a chemical reaction is occurring.

Explanation:

Answer:

Cl2 (aq) + 2H2 O HOCl(aq) + Cl-(aq) + H2O Equation 1 The hypochlorous acid dissociates almost immediately into hydrogen and hypochlorite ions (OCl-).

Explanation:

Answer:

Formula of water:H2O

Formula of potassium chloride:KCl

Answer:

5.0 L

Explanation:

We must recall that pressure is only held constant when referring to Charles law. We then put down the parameters given in the question.

Initial volume V1= 10.0 L

Initial temperature T1= 546 K

Final temperature T2= 273 K

Final volume V2= the unknown

From the statement of Charles law;

V1/T1 = V2/T2

V1T2= V2T1

V2= V1T2/T1

V2= 10.0 × 273/ 546

V2= 5.0 L

Therefore, the new (final) volume is 5.0 L

Answer:

Since the temperature is halved, the volume will also be halved.

The final volume is 5.0 L

Explanation:

Step 1: Data given

The pressure is constant

The initial volume of the gas = 10.0 L

The initial temperature = 546 K

The temperature is cooled to 273 K

Step 2: Calculate the final volume

V1/T1 = V2/T2

⇒with V1 = the initial volume = 10.0L

⇒with T1 = the initial temperature = 546 K

⇒with V2 = the final volume = TO BE DETERMINED

⇒with T2 = the final temperature = 273 K

10.0 L / 546 K = V2 / 273 K

V2 = (10.0 L * 273 K) / 546 K

V2 = 5.0 L

Since the temperature is halved, the volume will also be halved.

The final volume is 5.0 L

Answer:

6.022 x 10²³

Explanation:

602,200,000,000,000,000,000,000

start counting spots from right to left till you get 6.022

you counted 23 spots and that's the power of 10

finally 6.022 x10²³

Avogadro's number is the number of units in one mole of any given substance.

The concentration of the solution is 0.05 M

the molecular mass of HNO3 = 1 + 14+ 16 X 3 = 63g

we know the formula mass = number of moles X molecular mass the compound

the concentration of solution nothing but moles of compound in solution thus moles of solution = 3.15/63 = 0.05 M

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The most prevalent molarity unit in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.

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In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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Chemical reactions cause the bonds between the atoms in the reactants to rearrange to create new compounds , but no atoms vanish or are created.

Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.

A molecule changes into a different chemical species when light causes it to rearrange its structure, losing atoms in the process. The transformation of 7-dehydrocholesterol to vitamin D in the skin is one biologically significant photorearrangement event.

In a chemical reaction, reactants combine to generate products (new substances). The molecules' bonds break when energy is absorbed in the process, and they then reorganize to make new bonds.

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Answer:

MARK AS THE BRAINLIEST ANSWER

Explanation:

BRAINLIEST

Air is a mixture and carbon is a compound

Explanation:

I'm pretty sure it is right, if it's wrong then my second answer would be A.

Answer:

Q = 5254.39 J

Explanation:

Given that,

Mass of ethanol, m = 68.8 g

The temperature increases from 40.0°C to 71.3°C.

The specific heat of ethanol is 2.44 j/g°C

We need to find the heat absorbed by the ethanol. We know that the heat absorbed due to the change in temperature is given by :

\(Q=mc\Delta T\)

Put all the values,

\(Q=68.8\times 2.44\times (71.3-40)\\\\Q=5254.39\ J\)

So, 5254.39 J of heat is absorbed by Ethanol.

Answer:

A. 1.50

Explanation:

9.01 x 1023 molecules* 1 mol/ 6.022×1023 molecules= 1.49618067087 moles

Rounded would be 1.50

Answer:

A molecule of oxygen can have atoms of carbon in it.

Explanation: For CO2 there is one atom of carbon and two atoms of oxygen.

hope this help

plz mark brainliest

The first one appear to be a pan with some liquid heating up.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The second one seems to be a ice cube melting.

Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.

The third one is water, or other liquid, making clouds.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.

Answer:

I found this!

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa. An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample. Additionally, by applying an external voltage to the cell, chemical reactions can be forced to occur, and this is the basis of electro-synthesis, the production of chemical compounds.

In summary, electrochemical methods rely on the use of electrochemical cells because they allow for the conversion of chemical energy into electrical energy, and this electrical energy can be measured and used to determine the amount of a substance present in a sample or to generate chemical compounds.

Explanation:

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa.

An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample.

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The molecular equation for the reaction between hydrochloric acid and calcium carbonate can be written as:

HCl + CaCO3 → CaCl2 + CO2 + H2O

Hard water is water that contains a high concentration of dissolved minerals, specifically calcium and magnesium ions. These minerals are picked up by the water as it flows through soil and rocks, such as limestone, chalk, or gypsum.

The degree of water hardness is usually measured in parts per million (ppm) of calcium carbonate. Water with a concentration of calcium carbonate between 60-120 ppm is considered moderately hard, while water with a concentration above 120 ppm is considered hard.

The molecular equation for the reaction between hydrochloric acid and calcium carbonate can be written as:

HCl + CaCO3 → CaCl2 + CO2 + H2O

In this reaction, the hydrochloric acid (HCl) reacts with the calcium carbonate (CaCO3) to produce calcium chloride (CaCl2), carbon dioxide (CO2) gas, and water (H2O). The bubbling and fizzing observed during the reaction is due to the release of carbon dioxide gas.

Therefore, base on the equation HCl + CaCO3 → CaCl2 + CO2 + H2O  calcium chloride and water produced are both soluble in water and do not contribute to the hard water deposit.

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106.6Kg are in a banana containing 410 kJ of energy. Energy is always classified according to its type once it has been transmitted.

In physics, energy is the capacity to accomplish work. It can be potential, kinetic, thermal, electrical, chemical, radioactive, or in other forms. There is also heat and work—energy in the act of being transferred through one body to the other.

Energy is always classified according to its type once it has been transmitted. As a result, heat transported could become thermal energy, whereas labor done may emerge as mechanical energy.

One medium banana (∼118 g) contains 439.5kJ of energy.

1KJ = 118 g/439.5=0.26g

410 kJ =0.26g×410 =106.6Kg

Therefore, 106.6Kg  are in a banana containing 410 kJ of energy.

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The money and the metals did not rust after putting them in water and vegetable oil respectively as money is made up of alloy and oil on metals prevented the process of corrosion.

Corrosion is defined as a natural process where in the metal reacts with oxygen to form a stable oxide and thus leading to the deterioration of the metal, on exposure of the metal to the environment.

Most common form of corrosion is electrochemical oxidation or rusting wherein iron oxides are formed.Rusting usually produces a metallic oxide and a distinct change in color.Corrosion can also take place in ceramics,polymers but in this case the term degradation of ceramics or polymers is more common.

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Amines are organic substances that have a lone pair of nitrogen atoms in them.

Alkylamines and arylamines respectively, are essentially derivatives of ammonia (NH3) in which one or more hydrogen atoms have been swapped out for a group from the alkyl or aryl family.

An important class of chemical compounds known as amines is created by substituting one or more hydrogen atoms in the ammonia molecule with an alkyl/aryl group (s). They coexist in nature with proteins, vitamins, alkaloids, and hormones. Polymers, dyes, and pharmaceuticals are examples of synthetic materials.

A nitrogen atom that is creating a total of three bonds makes up the functional group known as the amine: One connection to the organic chain's parent. Two distinct bonds, either involving an alkyl group R or a hydrogen atom

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Answer:

The correct option is;

Waves that move through the Earth

Explanation:

In attempting to unravel the nature and arrangements of the rocks beneath the Earths surface, Geologist apply numerous methodologies including seismological field survey and analysis whereby the time of travel of natural (due to events such as earthquakes) or man made (during geological exploration) seismic wave are analysed to image the nature, composition and dynamism of the Earth's interior to find out the presence of geological faults or liquid layers as well as to predict the possible occurrence of future events within the Earth's crust in detail.

A type of evidence that geologists usually study is: B. waves that move through Earth.

Geology can be defined as the scientific study of the substances (both solid and liquid) and physical structure of planet Earth, including the processes through which they change over time.

A geologist refers to an expert or professional that studies geology. Some of the various type of evidence that geologists usually study are:

The different rock samples that are existing on the surface of planet Earth.

The mineral composition of the different layers of planet Earth.

The waves that move through planet Earth such as electromagnetic waves.

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The reason behind the lower yield of 4-acetamidobenzenesulfonamide (9) in absence of amonia is the formation extra elements in product.

In chemistry, yield, also defined as a reaction yield, which is measure of the quantity of moles of a product formed in relation to the reactant consumed in a chemical reaction. Generally, expressed as a percentage.

We have a chemical reaction, in which reactant is reacts and produce product as 4-acetamidobenzenesulfonamide (9). When crude sulfonyl chloride (8) was allowed to sit for a week and not combined with ammonia until the next laboratory period, the yield of product becomes lowered. It is because if amonia is not added and reacted with 4-acetamidobenzene-sulfonamide. As sulfonyl chloride (8) will hydrolyzed and form acid. With the formation of extra products the quantity of main products decreases.

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2..5 grams of platinum will be there at the end of the reaction, because Platinum is the catalyst here.

Catalyst is a substance that can be added to a chemical reaction to increase the rate of reaction without getting itself consumed in the reaction. It just acts as a driving force for the reaction and it itself does not take part in the chemical reaction.

Catalysts basically speeds up a reaction by reducing the activation energy or also by changing the reaction mechanism. Enzymes are proteins that act as catalysts in the biological systems.

In the above given question if 2.5 grams of platinum is added to the reaction vessel then at the end of the reaction 2.5 grams of platinum itself will be remaining because it acts as a catalyst here.

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Answer:

initiated the comprehensive discovery and cataloguing of a 'parts list' of most human genes 

Explanation:

To answer this question, we need to use the equilibrium constant expression for the reaction between solid CaF2 and NaF in solution:

CaF₂(s) ⇌ Ca₂+(aq) + 2F-(aq)

The equilibrium constant expression is:

Ksp = [Ca²⁺][F⁻]²

where Ksp is the solubility product constant for CaF₂.

Given that the Ksp for CaF₂ is 4.0 × 10–11, we can calculate the concentration of Ca²⁺ ion in the resultant solution:

Ksp = [Ca²⁺][F⁻]²
4.0 × 10–11 = x(0.010)²   (where x is the concentration of Ca²⁺ ion in mol/L)
x = 4.0 × 10–9 mol/L

Therefore, the concentration of Ca²⁺ ion in the resultant solution is 4.0 × 10–9 mol/L.

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The density of the sample : 0.827 g/L

In general, the gas equation can be written  

\(\large {\boxed {\bold {PV = nRT}}}\)

where  

P = pressure, atm , N/m²

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)

T = temperature, Kelvin  

n= 1 mol

MW Neon = 20,1797 g/mol

mass of Neon :

\(\tt mass=mol\times MW\\\\mass=1\times 20,1797 =20.1797~g\)

The density of the sample :

\(\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{20,1797}{24.4}=0.827~g/L\)

or We can use the ideal gas formula ta find density :

\(\tt \rho=\dfrac{P\times MW}{RT}\\\\\rho=\dfrac{1\times 20.1797}{0.082\times 298}\\\\\rho=0.826~g/L\)

The moles of number can be calculated by making use of the ideal gas law, which is given by PV = nRT.

The pressure of the gas, P = 7.51 x 10^7 PaThe volume of the gas, Where:P is the pressure of the gas.V is the volume of the gas.n is the number of moles of the gas. R is the universal gas constant, which has a value of 8.314 J/(mol*K).T is the temperature of the gas in Kelvin.

The pressure of the gas, P = 7.51 x 10^7 PaThe volume of the gas, V = 2.05 LThe temperature of the gas in Celsius, T = 34 °C = 307 KNote: Kelvin = Celsius + 273Substituting the values into the ideal gas law,PV = nRT7.51 x 10^7 Pa × 2.05 L = n × 8.314 J/(mol*K) × 307 Kn = (7.51 x 10^7 × 2.05) ÷ (8.314 × 307)n = 601.3/2548.5n = 0.236 moles of gasThere are 0.236 moles of gas in the given system.

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1)  The concentration of the first solution = 0.007625 M.

    The concentration of the second solution = 0.0003813 M.

    The concentration of the third solution = 0.00001906 M.

The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little amount of dissolved solute.

1. For the first solution:

Initial concentration = n₁ = 0.1525 M

Volume taken = v₁ = 5 ml

Final concentration = n₂ = ?

Final volume = v₂ = 100 ml

We know,

n₁ v₁ = n₂ v₂

n₂ = n₁v₁/ v₂ = ( 0.1525 M × 5ml) / 100 ml

n₂ = 0.007625 M

The first solution's concentration is 0.007625 M.

For the second solution:

Initial concentration = n₁ = 0.007625 M

Volume taken = v₂ = 5 ml

Final concentration = n₂ = ?

Final volume = v₂ = 100 ml

We know,

n₁ v₁ = n₂ v₂

n₂ = n₁v₁/ v₂ = ( 0. 007625 M × 5ml) / 100 ml

n₂ = 0.0003813 M

The second solution's concentration is 0.0003813 M.

For the third solution:

Initial concentration = n₁ = 0.0003813 M

Volume taken = v₁ = 5 ml

Final concentration = n₂ = ?

Final volume = v₂ = 100 ml

We know,

n₁ v₁ = n₂ v₂

n₂ = n₁v₁/ v₂ = ( 0.0003813 M × 5ml) / 100 ml

n₂ = 0.00001906 M

The third solution's concentration is 0.00001906 M.

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The glycolysis reaction is the process of the breakdown of glucose by enzymes. In this process, glucose is broken down into pyruvate, which results in the release of energy in the form of ATP (Adenosine Triphosphate) molecules. The process of glycolysis involves ten different enzymes, each of which catalyzes a specific step in the reaction.

Glycolysis reactions occur in the cytoplasm of cells. The reaction is a sequence of ten steps, with the first five being an energy-consuming process while the second five steps are energy-generating. During the first five steps, two molecules of ATP are consumed, while during the second five steps, four molecules of ATP are generated along with two molecules of NADH (Nicotinamide Adenine Dinucleotide).

The glycolysis reaction results in a net gain of two ATP molecules. The overall reaction can be represented as follows: Glucose + 2NAD+ + 2ADP + 2Pi → 2 pyruvate + 2NADH + 2ATP + 2H2O + 2H+.

The glycolysis reaction occurs in almost all living organisms and is the first step in both aerobic and anaerobic respiration.

Glycolysis is a complex process consisting of a series of ten reactions that occur in the cytoplasm of cells. The first five reactions are energy-consuming while the second five reactions are energy-generating. In the first five reactions, two ATP molecules are used up, while in the second five reactions, four ATP molecules are produced.

The reaction sequence results in the breakdown of glucose into pyruvate, with the release of energy in the form of ATP. This is why the process of glycolysis is considered to be a form of energy metabolism. Glycolysis is a vital process that occurs in almost all living organisms. It is the first step in both aerobic and anaerobic respiration.

The overall reaction can be represented as Glucose + 2NAD+ + 2ADP + 2Pi → 2 pyruvate + 2NADH + 2ATP + 2H2O + 2H+. Thus, it can be concluded that the process of glycolysis plays an important role in the energy metabolism of cells.

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