predict whether the following process results in an increase or decrease in the entropy of the system. explain. (a) crystalline table salt (nacl) is dissolved in water. entropy ---select--- because the number of particles increases. (b) gaseous argon condenses into liquid argon. entropy ---select--- because the phase of the substance changes from a highly disordered phase to a more orderly phase. (c) a rubber band at room temperature is cooled using liquid nitrogen. entropy ---select--- because the temperature decreases. (d) carbon monoxide gas is oxidized to carbon dioxide gas by molecular oxygen in the gas phase. entropy ---select--- because the number of gas phase particles decreases as a result of the reaction. need help?

Answer:

≈ 112.65 kmh

Explanation:

Formula

for an approximate result, divide the speed value by 37.282

hope this helped :)

Explanation:

1 mile = 1.609344... km

1 hour = 60 minutes

70 mph = 70 × 1.609344 / 60 =

= 1.877568... km/minute

When figuring out whether to place a double or triple bond you should always look at the number of valence electrons present as well as the number of bonds a central atom is likely to form. Another good way to know whether to use double or single bonds is to calculate the formal charge on each atom in the molecule.

What is Lewis structure of molecules?

Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that depict the interactions of atoms inside molecules as well as any lone pairs of electrons that may be present. Any molecule with a covalent link, as well as coordination compounds, can have a Lewis structure. Gilbert N. Lewis, who first described it in his 1916 article The Atom and the Molecule, gave the Lewis structure its name. Lewis structures add lines between atoms to represent shared pairs in a chemical bond, extending the idea of the electron dot diagram.

Hence, when figuring out whether to place a double or triple bond you should always look at the number of valence electrons present as well as the number of bonds a central atom is likely to form. Another good way to know whether to use double or single bonds is to calculate the formal charge on each atom in the molecule.

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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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The bond formed between two nonmetals, which are usually very similar in their tendency to lose or gain electrons, is the covalent bond. This bond involves the sharing of one or more electron pairs between the two atoms.

What is covalent bond?

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

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Observing particles moving against the concentration gradient in a lab investigation. this type of transport are they observing is active transport.

The active transport can be as the movement of the particles from lower concentration to the higher concentration are on the opposite in the direction of the concentration gradient. in the given condition the particles are moving in the against the concentration gradient in an investigation so, this is an active transport. The active transport are of two types : the primary active transport and the secondary active transport.

Thus, Observing particles moving against the concentration gradient in a lab investigation. this type of transport are they observing is active transport.

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If mass spectrometry data give its molecular mass of the compound as 410 u, then the empirical formula units in the molecular formula will be 10.

% mass of C in vitamin D present in the human body = 87.73 %

% mass of H in vitamin D present in the human body = 12.27 %

Molecular mass of the compound = 410 u

Empirical formula units in the molecular formula = ?

Calculate the empirical units of C and H

    empirical units = percentage / atomic weight

    empirical units of C = 87.73 / 12

    empirical units of C = 7.3

    empirical units of H = 12.27 / 1

    empirical units of C = 12.27

Divide the formula units by the least value and multiply by 3

    empirical formula units of C = 7.3 / 7.3 × 3

    empirical formula units of C = 3

    empirical formula units of H = 12.27 / 7.3 × 3

    empirical formula units of H = 5

So empirical formula units = C₃H₅

Calculate the empirical formula mass

    emperical formula mass = 3 × 12 + 5 × 1

    emperical formula mass = 41

Calculate the empirical formula units

    empirical formula units = molecular mass / empirical mass

    empirical formula units = 410 / 41

    empirical formula units = 10

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Result is Chlorine has an oxidation number of +5 in the ion ClO3-.

A chemical process that occurs when an object comes in contact with carbon or another oxidizer. Rust and an apple's brown color are examples of oxidation.

Antoine Lavoisier coined the term "oxidation" in order to describe a substance's reaction with oxygen. Much later, it was understood that the substance loses electrons when it is oxidized, and the term was expanded to cover other processes in which electron are lost, whether or not oxygen was present.

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If pressure is held constant, the combined gas law would become [tex]v_1/t_1 = v_2/t_2[/tex]

If the volume is held constant, the combined gas law would become [tex]p_1/t_1 = p_2/t_2[/tex]

The combined gas law is a law that relates Boyle's law, Charle's law, and Gay-Lussac's law together in a single equation. The equation is expressed below:

[tex]p_1v_1/t_1 = p_2v_2/t_2[/tex]

Where [tex]p_1[/tex] is the initial pressure of gases, [tex]v_1[/tex] is the initial volume of gases, [tex]t_1[/tex] is the initial temperature of gases, [tex]p_2[/tex] is the final pressure, [tex]v_2[/tex] is the final volume, and [tex]t_1[/tex] is the final temperature.

If pressure is held constant, it means [tex]p_1 = p_2[/tex], the equation becomes:

[tex]v_1/t_1 = v_2/t_2[/tex]

If the volume is held constant, it means [tex]v_1 = v_2[/tex], the equation becomes"

[tex]p_1/t_1 = p_2/t_2[/tex]

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When more moles of gas are introduced into a rigid container the deviation from ideal behavior decreases.

According to ideal gas equation,

pV=nRT

n = number of moles of gas

P = pressure of the gas

V = volume of the gas

R = gas constant

T = temperature

Then,  

pV/nRT = 1

Therefore, compressibility factor is,

Z = pV/nRT = 1

For an ideal gas Z = 1 and for real gas, Z may be either greater than one or less than one.

From the equation of deviation from ideal gas behavior it is clear that,

n ∝ 1 / Z

Hence, When more moles of gas are introduced into a rigid container the deviation from ideal behavior decreases.

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P = 3.67 atm is the total pressure in the flask assuming that the initial pressure was 0 atm .

What is Ideal gas law ?

The ideal gas law (also called the perfect gas law), the relationship between the pressure P, volume V, and temperature T of a gas in the boundary region between low pressure and high temperature. Gas molecules move almost independently. each other .

PV = nRT, where n is the number of moles of gas and R is the universal (or perfect) gas constant, 8.31446261815324 joules/kelvin/mol (the universal gas constant is defined as Avogadro's number NA multiplied by Boltzmann's constant k) . ) In the International System of Units, energy is measured in joules, volume in cubic meters (m3), force in newtons (N), and pressure in pascals (Pa). where 1 Pa = 1 N/m2. A force of 1 Newton moving a distance of 1 meter does 1 Joule of work. Therefore, the product of both PV and nRT has the dimension of work (energy).

For He:  PV = nRT and n = PV/RT

n = (5.6 atm)(3.0 L)/(0.0821 Latm/Kmol)(298K) = 0.687 moles He

For Ne:  PV = nRT and n = PV/RT

n = (3.6 atm)(4.5 L)/(0.0821 Latm/Kmol)(298K) = 0.662 moles Ne

Total moles = 0.687 + 0.662 = 1.349 moles

PV = nRT

P = nRT/V

P = (1.349 mol)(0.0821 Latm/Kmol)(298 K)/9.0 L

P = 3.67 atm

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The following statements is correct about the comparative first ionization energies of the atoms in the following set: Mg, P, Sr , Sb, Ga is that P has largest ionization energy than Sr.

The trend of ionization energy in the periodic table is when we move from left to right in the periodic in the period ionization energy increases. when we move down the group in the periodic table then the ionization energy decreases.

Thus, The following statements is correct about the comparative first ionization energies of the atoms in the following set: Mg, P, Sr , Sb , Ga is that P has largest ionization energy than Sr.

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The plant most likely absorb from the water for the process that produces the oxygen gas is Carbon Dioxide .

What is photosynthesis ?

Photosynthesis is defined as the processes that bring about the manufacturing of food by green plants.

Food is complex energy-rich organic matter which living organisms feed on to obtain nutrients, substances necessary for life. Green plants which are known as autotrophs has the ability to produce their own food through the process of photosynthesis.

The main features of photosynthesis include:

It takes place in the chloroplasts of plants, in the presence of sunlight.

The energy needed for the process is gotten from sunlight which is absorbed by chlorophyll found in the chloroplasts.

The raw materials used are low-energy containing inorganic compounds, example: carbon dioxide and water.

The final products are high-energy containing sugars. oxygen is given off as a waste product.

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Using the formula v=3RTM, the RMS velocity of the a gas may be calculated as R=8.314J.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit & Celsius. Temperature shows the direction of the spontaneous movement of heat energy, i.e., from a hotter body to a cooler object (one at a lower temperature).

Based on the International Unit of Measure, K, represented by the symbol K, is the Si derived unit of heat. However, the Celsius and Centigrade scale is used to determine temperature throughout the majority of the world.

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Answer: make it paragraph form lol

Explanation: i really want 30 points

In this process, the systems undergo phase and temperature changes.

Hence , option C is correct.

How does this happens?

In this process, ice is melted to water thus, it's phase changes.

After mixing ice temperature of the tea goes down. Thus, temperature of the system also changes.

Therefore, in the process both phase and temperature change.

Phase Change = There are three types of phases  solid, liquid, or gas. Melting, freezing, evaporating, condensing, sublimation, and deposition are the six ways a substance can transition between these three phases.

Temperature Change = Temperature change on the other hand can be defined as sudden increase or decrease in the temperature.

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36.72 g water vapor, in grams, is produced when H₂S reacts completely at 2.0 atm and 290 K,

2H₂S(g) + O₂(g) → 2H₂O(g) + 2S(s)

volume=6.5 l

pressure= 2.0 atm

Temp=290 K

Gas constant, R= 0.0821 atm•L/mol•K T

Molar mass 2H₂S= 68

n= moles

PV=nRT

n=PV/RT

n= 2.0 atm ×6.5 l÷ 0.0821×290 K

n=13/23.78

n=0.54

n= given mass/molar mass

given mass=n × molar mass

given mass=36.72

Water that is gaseous rather than liquid is known as water vapour. Evaporation or sublimation are two processes that can be used to create it. Unlike clouds, fog, or mist, which are only suspended drops of liquid water in the atmosphere, water vapour is a gas and cannot be seen.

In the atmosphere, water vapor frequently exists below the boiling point. Boiling water causes the water to evaporate significantly more quickly and produce steam. Since water is boiling, steam frequently contains water droplets. This is known as wet steam because both water droplets and water vapor are present (also called wet vapor).

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The equilibrium constant for reaction 3 is K3 = K2K1.

The equilibrium constant is equal to the forward reaction rate constant divided by the reverse reaction rate constant. A mathematical ratio indicating product concentration divided by reactant concentration. Kp and Kc are the equilibrium constants of an ideal gas mixture.

Kp is the equilibrium constant used to express equilibrium concentrations at atmospheric pressure and Kc is the equilibrium constant used to express equilibrium concentrations in molar terms. The specific rate constant is a constant of proportionality that relates reaction rate to reactant concentration. So here both reactants and products are gases so only one reaction occurs with the same number of reactants and products.

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In locations one mile above sea level such as Denver, Colorado, the atmospheric pressure is less than 1 atm because the air is less dense. This means that it takes 95 °C thermal energy to get a liquid to boil in these locations

There are small molecule of air in the atmosphere and these molecules combine and form different layer in the atmosphere which create some kind of pressure and the pressure create by the air molecule layer is known to be the atmospheric pressure which is exerted by everything in the atmosphere and less pressure will decreases the temprature for water boiling point

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Answer:

Oxygen reacts with the carbon anode to form carbon dioxide. Therefore, the anode gradually oxidizes. They must be replaced frequently, which increases the cost of aluminum production.

The expected CO2 concentration will be around 400 ppm in 2100.

What do you mean by RCP?

RCP's can be defined as the Representative concentration pathway which is usually a  climate model to describe the different radiative forcing depending on the CO2 concentrations.

The above case studies states that:

The RCP 2.6 scenario is "rise and fall" scenario in which the radiative forcings will rise up to about 3.1W/m2 by 2050 and then decline to 2.6W/m2 by 2100. The CO2 concentrations are expected to be within 400 ppm in this model. Oceans will warm at a slower pace and most of the sea level rise is expected from melting of ice sheets.

Hence, The expected CO2 concentration will be around 400 ppm in 2100.

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The vapor escapes from the storage vessel it will mix with air and become flammable.

Inert is different from flushing. flushing ensures that no ignitable mixture is formed. Inerting makes flammable mixtures safe by introducing an inert gas. Exhaust gas generated from a ship's boiler into a scrubber by a fan cleaned and cooled to generate inert gas, which is sent to the ship's cargo tank as an inert gas.

Inert gas is an asphyxiating agent. Asphyxiating gases replace the oxygen in the air and reduce the oxygen you breathe. Without oxygen, you will die. Before entering a room with large amounts of inert gas, make sure there is enough oxygen in the room or have a self-contained breathing apparatus. They are said to adopt the noble gas configuration or the perfect electronic configuration.

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The molarity of the HCl, if the solution has a density of 1. 20 g/ml will be  12.83 M

% of HCL in the solution = 39.0 %

Density of the solution = 1.20 g/ml

Molarity of HCL = ?

Volume of the solution is not given so we take it as 1.0 L

Calculate the mass of silution

   mass = density × volume

    mass of solution = 1.20 g/ml × 1000 ml/L × 1.0 L

    mass of solution = 1200 g

Calculate the mass of HCl

38 %  = 38 g / 100 g

    mass of HCl = 1200 g (39 g / 100 g)

    mass of HCl = 1200g × 0.39 g

    mass of HCl = 468 g

Now calculate the number of moles of HCl

    number of moles = mass / molar mass

    number of moles of HCl = 468 g / 36.46 g

    number of moles of HCl = 12.83 mol

Calculate molarity

    molarity = number of moles of solute / volume L

    molraty HCl = 12.83 mol / 1 L

    molarity of HCl = 12.83 mol/L or 12.83 M

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In obtaining the rate of reaction for the reaction of sodium metal and water;

a) -0.005 g/s

b) 0.000217 mol/s

c) 0.00025 g/s

d) 0.0001084  mol/s

The term rate of reaction has to do with the rate at which the reactants are changed to become products or the rate at which the products are seen to appear.

a)  The average rate of decrease of the sodium in g/s is;

Mass of sodium/ time taken

= -(0.075 g / 15  s) = -0.005 g/s

b) The average rate of decrease of the sodium in mol/s;

Number of moles of sodium = 0.075 g/23 g/mol = 0.00326 moles

Given that;

Number of moles/ time taken

= 0.00326 moles/15 s

= 0.000217 mol/s

Given that the reaction equation is;

[tex]2Na(s) + 2H_{2} O(l) ---- > 2NaOH(aq) + H_{2}(g)[/tex]

c) The average rate of production of hydrogen in g/s = 1/2 * 0.005 g/s

= 0.00025 g/s

d) The average rate of production of hydrogen in mol/s;

1/2 * 0.000217 mol/s

= 0.0001084  mol/s

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To prepare a 1.72 m solution of nano3, the volume (in liters) which would you have to dilute 31.9 ml of 3.45 m NaNO3 is 63.9 ml.

This problem can be solved by using the concept of molarity.

Molarity is defined as the ratio of moles of solute to the volume of solution.

Mathematically,

Molarity = moles of solute / volume of solution

Given,

Concentration of NaNO3 = 3.45 m

Volume of NaNO3 = 31.9 ml

As we know that,

Concentration = mole / volume

By substituting all the values, we get

3.45 m = mole / 31.9

Mole = 3.45 × 31.9

Moles of NaNO3 = 110.05 mol

Moles of NaNO3 = 110.05 mol

Molarity of NaNO3 = 1.72 m

By substituting all the values, we get

1.72 m = 110.05 / volume

Volume = 110.05 / 1.72 = 63.9 ml

Thus, we concluded that to prepare a 1.72 m solution of nano3, the volume (in liters) which would you have to dilute 31.9 ml of 3.45 m NaNO3 is 63.9 ml.

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199,257.6 J of heat energy is required to raise the temperature of a 16.8 g block of silver from 600.°C to its melting point,961.8°C, and fully melt the sample at this temperature.

The heat required to raise the temperature of a 16.8 g block of silver from 600°C to its melting point, 961.8°C, can be calculated using the equation:  

Q₁ = mcΔT  

where Q is the heat required (in joules), m is the mass of the silver (in grams), c is the specific heat of silver (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).  

The heat required would be:  

Q₁ = (16.8 g)(0.240 J/g°C)(961.8°C - 600°C)  

Q₁ = 158,608 J  

The heat required to fully melt the sample at this temperature can be calculated using the equation:  

Q₂ = mΔHf  

where Q is the heat required (in joules), m is the mass of the silver (in grams), and ΔHf is the heat of fusion of silver (in joules per gram).  The heat required would be:  

Q₂ = (16.8 g)(88 J/g)  

Q₂ = 1,472 J  

To determine the heat energy with vaporization,

Q₃ = mΔHv

Q₃ = 16.8x2332

Q₃ = 39.1776 J

Therefore, the total heat required to raise the temperature of a 16.8 g block of silver from 600°C to its melting point, 961.8°C, and fully melt the sample at this temperature would be:  

Qtotal = Q₁ + Q₂ + Q₃

Qtotal = 158,608 J + 1,472 J + 39.1776

Qtotal = 199,257.6 J

Therefore, the heat energy required is 199,257.6J

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It helps Bromination of the Grignard reagent because it helps solvate and stabilize the reagent as it forms.

The very simple reason is that in ether, there is no acidic Hydrogen present on which the Grignard reagent RMgX can attack and get itself converted to R−H .

This reaction is treasured for its capacity to form carbon-carbon bonds. The Grignard reagents are formed from the response of an alkyl halide with magnesium metal in anhydrous ether. The carbon atom of the Grignard reagent can characteristic as both a sturdy base and a strong nucleophile.

Grignard reagents are used synthetically to form new carbon–carbon bonds. A Grignard reagent has a very polar carbon–magnesium bond wherein the carbon atom has a partial bad fee and the metallic a partial wonderful rate.

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Grams of Ca2+ present in solution is 0.24

What do you mean by replacement solution?

A replacement reaction can be defined as a reaction in which one element.

It can be expressed in the following manner

A+BC→AC+B.

In this  reaction, element A is a metal and replaces element B (also a metal) in the compound. For example when iron is added to a copper sulphate solution, it displaces the copper metal.

A double-replacement reaction exchanges the cations or the anions of the two ionic compounds.

2NaCl(aq)+F2(g)→2NaF(s)+Cl2(g).

Moles = 2 milli

= 2/1000*3 = 0.006

Grams of Ca2+ present in solution= 0.006*40 = 0.24

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Answer:

average kinetic energy

Explanation:

Answer:

this one is 1

Explanation:

The bond order of Br2 is 1.

What is bond order?

Bond order defines the number of chemical bonds between a pair of atoms and is a measure of a bond's stability.

Since bromine only needs one more electron to complete an octet, it will work tirelessly to acquire it. A bromine atom joins with another bromine atom to do this through a covalent connection.

Hence bond order of Br2 is 1

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Learn about the physical and chemical changes.

What is chemical change?

One material changing into another, creating new materials with unique properties, or creating one or more new substances are all examples of chemical changes. As a result, it occurs when two substances combine to form a new substance.

What is physical change?

When a physical change occurs, the material affected by the change retains its structural integrity both before and after the change. Types of physical changes include those in texture, shape, temperature, and the state of the matter. A substance's texture can change without also changing how it feels.

Therefore, the demonstration is chemical change.

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