How many grams of KBr are contained in 150. mL of a 0.154 M solution of potassium bromide?

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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It's a chemical change.

Explanation:-

Formation of crystals of sugar from a sugary syrup is a chemical change. Because, we cannot get sugary syrup back from the sugar crystals. Yet, it is chemical change.

its True

Yes, burning of wood is an example of oxidation-reduction reaction.

hope it helps

The diagram is correct because electrons are present in distinct energy levels around the nucleus. Option D

Let nus just take a minute to be able to remind ourselves that when we look at the atom that there are several subatomic particles that can be shown to be able to make up the atom. We know that the electron is the particle that can be shown to be arranged in shells.

What we saw in the inner or the core of the atom is the nucleus and the six grey spheres  that we can see there would have to do with the nucleus of the atom that is in the question.

As we now look up at the shells, we can see the electrons as they have been arranged into the respective shells were they can be found in the atom on the basis of the energy that they possess.

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Answer:

99°C

Explanation:

asking questions is Best in life of education

The kinetic theory of matter states the movement of the particles in matter. The water sample at 99°C will vibrate at the fastest speed. Thus, option B is correct.

The kinetic theory of matter states the properties of the particles including the effect of factors like temperature, volume, and pressure on the various phases of matter.

The temperature of the water sample at 99°C is the highest and hottest that increasing the kinetic energy exhibited by the particles. This event in turn increases the collision and the speed of the particles and molecules.

The temperature has a direct relation to kinetic energy, collision, and speed. As the temperature increases, the random movement causes an increase in the kinetics.

Therefore, option B. water sample at 99°C has the molecules with the fastest speed.

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Answer:

\(Molec_{\ H_{tot}}=1.206x10^{25}molec\)

Explanation:

Hello.

In this case, taking into account that HCl has one molecule of hydrogen per mole of compound which weights 36.45 g/mol, we compute the number of molecules of hydrogen in hydrochloric acid by considering the given mass and the Avogadro's number:

\(molec_{\ H}=3.65gHCl*\frac{1molHCl}{36.45gHCl} *\frac{1molH}{1molHCl}*\frac{6.022x10^{23}molec_\ H}{1molH} =6.03x10^{22}molec\)

Now, from the 180 g of water, we see two hydrogen molecules per molecule of water, thus, by also using the Avogadro's number we compute the molecules of hydrogen in water:

\(molec_{\ H}=180gH_2O*\frac{1molH_2O}{18gH_2O} *\frac{2molH}{1molH_2O}*\frac{6.022x10^{23}molec_\ H}{1molH} =1.20x10^{25}molec\)

Thus, the total number of molecules turns out:

\(Molec_{\ H_{tot}}=6.03x10^{22}+1.20x10^{25}\\\\Molec_{\ H_{tot}}=1.206x10^{25}molec\)

Regards.

Answer:

Explanation:

same thing as normal plane. just replace normal metal with this new sick metal :cool:

also make sure it weighs a good amount and won't fall from weight... im confused was this already answered???

Answer:

Collaborate with other engineers in the design of a plane made from this metal

Explanation:

<3

Answer:

correct will be from back to the start:

grass-grasshopper-toad-snake-hawk

Explanation

ood chain begin with plant-life and end with animal-life.

Answer:

is 5509.12

Explanation:

creo que es eso no se lo siento

Answer:

586 kpa(kilopascal/1000 pascals)

Explanation:

given 1.24 atm(standard atmosphere), and 66.7 psi(pound force per square inch).

To find the total pressure we should use dalton's law of partial pressures which is the sum of the pressures of each individual gas.

then we convert them to pascals and divide by 1000 to get the measurement in kilopascal.

knowing that 1 atmosphere is proportional to around 14.696 psi. We can multiply our given measure of atm by that and sum it by psi like so. 1.24×14.6959 = 18.22298.

Then,

18.22298+ 66.7 = 84.92298

psi.

Since 1 psi is proportional to around 6894.76 pascals. 1 psi will be 68.9476 kilopascal. 84.92298 * 6.89476 = 585.523336 ≈ 586

Answer:

I would go with

B. Surface water at the poles is dense because of low temperatures and high salinity.

i could be wrong tho.

Explanation:

Answer:

474 nm or 4.74 x 10^2 nm

Explanation:

c = λv

c (speed of light) = 2.998 x 10^8 m/s

λ = ?

v = 6.32 × 1014 Hz = 6.32 × 1014 1/s

2.998 x 10^8 m/s = (λ)(6.32 × 10^14 1/s)

λ = (2.998 x 10^8 m/s) / (6.32 × 10^14 1/s)

λ = 4.74 x 10^-7 m

λ = 4.74 x 10^-7 m x (1 x 10^9 nm/1 m) = 474 nm

The enthalpy (in kJ/mol) of the reaction, given that 0.026 moles of H₂O₂ at 25.0 °C is placed in a coffee cup calorimeter is 95.98 KJ/mol

First, we shall determine the heat energy of the reaction. Details below:

Q = MCΔT

Q = 30 × 4.18 × 19.9

Q = 2495.46 J

Finally, we shall determine the enthalpy of the reaction. Details below:

Q = n × ΔH

2.49546 = 0.026 × ΔH

Divide both sides by 0.026

ΔH = 2.49546 / 0.026

ΔH = 95.98 KJ/mol

Thus, the enthalpy of reaction is 95.98 KJ/mol

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Answer:

Retention factor or \(R_f\) value is defined as the ratio of distance traveled by the unknown to the distance traveled by the solvent front.

\(R_f=\frac{\text{ distance by unknown}}{\text {distance by solvent}}\)

Putting in the values we get:

\(R_f_{X}=\frac{0.50cm}{3.0cm}=0.16\)

\(R_f_{Y}=\frac{1.0cm}{3.0cm}=0.33\)

As the \(R_f\) value of Y is more than X , it follows that Y compound will be retained less strongly than the compound X. Thus Y is more polar than X.

Answer:

One atom of sulfur has a mass of 32.07 AMU; one mole of S atoms has a mass of 32.07 g.

Explanation:

Therefore, the answer should be 32.07 g

Answer:

Oxygen-16 has 8 protons and 8 neutrons, and a mass number of 16. Oxygen-17 has 8 protons and 9 neutrons, and a mass number of 17. Oxygen-18 has 8 protons and 10 neutrons, and a mass number of 18.

Explanation:

To determine the original pressure of a 750 ml sample of helium (He) at 0 degrees Celsius, we can use the combined gas law, which relates the initial and final conditions of a gas sample. The combined gas law equation is:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively.

V1 and V2 are the initial and final volumes, respectively.

T1 and T2 are the initial and final temperatures, respectively.

Let's assign the given values:

P1 = unknown (original pressure)

V1 = 750 ml (initial volume)

T1 = 0 degrees Celsius (initial temperature)

P2 = 2 atm (final pressure)

V2 = 500 ml (final volume)

T2 = 25 degrees Celsius (final temperature)

Before using the combined gas law equation, we need to convert the temperatures to Kelvin scale by adding 273.15 to both T1 and T2:

T1 = 0 + 273.15 = 273.15 K

T2 = 25 + 273.15 = 298.15 K

Now we can plug in the values into the combined gas law equation:

(P1 × 750 ml) / (273.15 K) = (2 atm × 500 ml) / (298.15 K)

To solve for P1, we can cross multiply and rearrange the equation:

P1 = (2 atm × 500 ml × 273.15 K) / (750 ml × 298.15 K)

P1 = 0.924 atm

Therefore, the original pressure of the 750 ml sample of helium at 0 degrees Celsius is approximately 0.924 atm.

Answer:

1. alpha -  decreased mass by 4  - decrease atomic number by 2

2. beta electron - no change - increase by 1

3 - beta positron - no change - decrease by 1

4. gamma - no change - no change

5. electron capture - no change - decrease by 1

Explanation:

There are five main types of radioactive decay, a process where the nucleus loses energy by emitting radiation, these radiation or type of radioactive decay are alpha particles, beta particles, positron or beta positron, gamma particles and electron capture.

The effect of these particles causes a change in the number of subatomic which leads to different atomic mass and atomic numbers after the decay -

1. alpha -  decreased mass by 4  - decrease the atomic number by 2

2. beta electron - no change - increase by 1

3 - beta positron - no change - decrease by 1

4. gamma - no change - no change

5. electron capture - no change - decrease by 1

Answer:

matter are anything that has space

Answer:

Explanation:

The Reaction Rate for a given chemical reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time. Let's see the following reaction:

The rate can be measured in terms of either reactant (A or B) or either product (C or D), like this:

The problem is asking for the rate of the reaction in terms of the change of nitrogen dioxide (NO2) concentration, so we can apply the formula of rate.

As NO2 are in the reactants, the rate is negative because it is consuming and the coefficient which is 14 is in the denominator:

The answer would be that the rate of NO2 concentration in the reaction is -1/14*(Δ[NO2])/Δt).

Answer:

\(V=6.54L\)

Explanation:

Hello!

In this case, since we are given the density in g/mL, the first step is to compute the mass in grams as shown below:

\(m=50.0lb*\frac{454g}{1lb} =22700g\)

Now, we use the density to compute the volume as follows:

\(V=22700g*\frac{1mL}{0.917g} =24.755mL\)

Finally, we convert to gallons:

\(V=24755mL*\frac{1L}{1000mL} *\frac{1gal}{3.7854L}=6.54L\)

Best regards!

Enzymes speed up the process while being unaffected by the one they catalyze. Enzyme properties are being researched.

The vital function of enzymes is to reduce the activation energy of a reaction, or the number of calories necessary for the process to start. In order to facilitate the chemical bond-forming and bond-breaking processes, enzymes bind to reactant components and hold them in place.

As biological catalysts, enzymes quicken the pace of biological reactions. Enzymes change one energy form into a more useful one. Cofactors are elements that help enzymes function. There is a great degree of selectivity in enzymes.

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Answer:

Al2(CO3)3 (A)

Explanation:

i think thats the answer

Aluminum carbonate is indeed a carbonate solution of aluminum that is intended for oral intake. It should be the carbonate salt type of aluminum that's also intended for oral consumption.

Therefore, the answer is "\(\bold{Al_2(CO_3)_3}\) ".

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Answer: The answer is both diseases and availability of resources can limit the growth of a population of organisms which is A

Explanation:

Answer:

A

Explanation:

it has a methyl group, ethyl group and amine group

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms.

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms. According to the IUPAC naming rules, the longest carbon chain is selected as the parent chain, which in this case consists of two carbon atoms. The substituent attached to the parent chain is an ethyl group, denoted as "C2H5". The amine functional group, which consists of the nitrogen atom, is named as "amine". Since there is only one amine group attached to the carbon chain, it is referred to as "ethylamine." Therefore, option C) "ethylamine" is the correct IUPAC name for the given structure.
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The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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Answer:

The answer is 1385 x10∧ -3

Explanation:

Scientific notation is a quick way to represent a number using notation in exponential form or powers of base ten.

This notation allows us to express too large or small numbers easily.

For example:

500 is written as 5x10∧2; Where the power 2 represents the number of 0's that follow 5.

0.0093 is written as 9.3x10∧-3; Where the power -3 represents the number of times the comma was moved to the right.

Explanation and Answer:

a) We use [H3O+] to find pH:

b) We use pOH to find pH: