Air has a mass of 1.2g and a volume of 4,555ml. What is the density

28 grams of MgCl2.

50 mL stock + 350 mL water.

False. β-mercaptoethanol reduces disulfide bonds in proteins during SDS-PAGE, it doesn't degrade them.

1. To calculate the grams of MgCl2 needed, we can use the formula:

grams of MgCl2 = volume (mL) * concentration (% w/v) / 100

Plugging in the values:

grams of MgCl2 = 800 mL * 3.50% / 100

grams of MgCl2 = 28 grams

You would need 28 grams of MgCl2 to prepare 800 mL of 3.50% MgCl2.

2. To dilute the stock solution to a desired concentration, we can use the formula:

C1V1 = C2V2

Where:

C1 = concentration of stock solution

V1 = volume of stock solution

C2 = concentration of desired solution

V2 = volume of desired solution

In this case, we have an 8X stock and want to prepare a 1X buffer. Using the formula, we can calculate the volume of stock solution needed:

8X * V1 = 1X * 400 mL

V1 = (1X * 400 mL) / 8X

V1 = 50 mL

So, you would need to add 50 mL of stock solution to 350 mL of water to prepare 400 mL of 1X buffer.

3. During SDS-PAGE, proteins are not degraded by β-mercaptoethanol (BME). β-mercaptoethanol is used as a reducing agent to break disulfide bonds in proteins, which helps to denature the proteins and unfold them for separation based on their size using SDS-PAGE.

It does not degrade or destroy the proteins, but rather modifies their structure temporarily to facilitate separation.

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Answer:

two north poles and two south poles

Explanation:

A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.

No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.

Answer:

Each piece will still have a north pole and a south pole.

Explanation:

Answer:

92.26% of C

Explanation:

To solve this problem we must assume we have 1 mole of benzene. The mole contains 6 moles of C and 6 moles of H. We have to convert these moles to grams in order to find the total mass and mass percent will be:

Mass atom / Total mass * 100

Mass C: 6mol C * (12.0107g / mol) = 72.0642g

Mass H: 6mol H * (1.00794g / mol) = 6.04764g

total mass: 72.0642g + 6.04764g = 78.11184g

Mass percent of C will be:

72.0642g C / 78.11184g* 100

Subtract the initial mass from final mass, i.e., vm.

Answer:

Hydrogen, H, has an oxidation number of +1 unless it is combined with metals, where it has the oxidation number -1. –Examples – LiH = Li+ H-, BaH2= Ba 2+ H-7. Oxygen usually has the oxidation number -2.

Explanation:

Group IA are metals and all react vigorously because they have 1 valence electron in their outer most shell and the reactivity increases as you go down the group. Group VIIIA are non reactive because of their complete valence shell.

Molecule is defined as number of atoms combined together, that shows the most smaller chemical compound's fundamental unit that participate in chemical reaction. In the combination of atoms attractive forces play a vital role and it helps to bound the atoms by a chemical bond.

Liquid consist of small range of order and the reason behind this is intermolecular attractive force which is very strong and due to this reason molecules are packed together tightly. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly  with one another.

Water is considered to be the simpler molecule and it consist of hydrogen and oxygen atom bounded together and due to the reason of high electronegativity of the oxygen's atom the bonds present are polar as well as covalent.  Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly  with one another.

Therefore,Group IA are metals and all react vigorously because they have 1 valence electron in their outer most shell and the reactivity increases as you go down the group. Group VIIIA are non reactive because of their complete valence shell.

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Answer:

Atomic number: 26

Atomic mass: 56

Net charge: +3

Explanation:

Answer:

Potassium Bromide

Explanation:

not sure but i think thats it

25 gigaseconds is equal to 2,500,000,000,000 centiseconds

An empirical formula presents the atoms of all the elements with the most simplified whole number ratios. In other words, divide each subscript by their greatest common factor.

The greatest common factor of 2 and 4 is 2.

2/2 = 1

4/2 = 2

So, the empirical formula for tetrachloroethene is CCl₂.

Answer:

D

Explanation:

Electrons are being filled according to the increasing other of their sublevel energy

The symbοls fοr these elements are:

A chemical element is a chemical substance that cannοt be brοken dοwn intο οther substances. The basic particle that cοnstitutes a chemical element is the atοm, and each chemical element is distinguished by the number οf prοtοns in the nuclei οf its atοms, knοwn as its atοmic number.

Fοr example, οxygen has an atοmic number οf 8, meaning that each οxygen atοm has 8 prοtοns in its nucleus. This is in cοntrast tο chemical cοmpοunds and mixtures, which cοntain atοms with mοre than οne atοmic number.

The chemical elements that meet the given criteria (atοmic number less than 15 and atοmic mass greater than 23.9u) are:

Therefοre, the symbοls fοr these elements are:

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As per the given data, the specific heat of the copper sample is approximately 0.384 J/g·°C.

For the specific heat of copper, we can use the formula:

q = mcΔT

Given that:

Mass of copper (m) = 5g

Change in temperature (ΔT) = 50°C - 10°C = 40°C

Heat absorbed (q) = 76.8 J

76.8 J = 5g × c × 40°C

76.8 J = 200g°C × c

c = 76.8 J / 200g°C

c ≈ 0.384 J/g·°C

Thus, the specific heat of the copper sample is approximately 0.384 J/g·°C.

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False. Charged particles are accelerated to produce energy or to use them for scientific purposes such as in particle accelerators.

They may also be used for medical applications such as in radiation therapy. The probability of a nuclear reaction depends on the energy and other properties of the charged particle and the target material, as well as the reaction cross section, which is a measure of the likelihood of the reaction occurring

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Phương trình NaOH sai nha

Answer:

The force that keeps the planets in orbit is gravity.

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(Density = \frac{mass}{volume} \)

From the question

mass = 67 g

Volume of ring = new volume of water - original volume of water

Volume = 13.47 - 10 = 3.47 mL

Substitute the values into the above formula and solve

That's

\(Density = \frac{67}{3.47} \\ = 19.308357\)

We have the final answer as

Hope this helps you

Answer:

equal to

Explanation:

The law of conservation of mass tells us that during a chemical reaction, matter cannot be created or destroyed, but it can change from one form to another. This means that while atoms can rearrange themselves into new substances during a reaction, the mass of the reactants and products will be the same.

The new molarity of K ions in the solution is 0.160 M. Molarity, also known as molar concentration, is a measure of the concentration of a solute in a solution.

To calculate the new molarity of K ions in the solution, we need to use the following formula:

M1V1 = M2V2

where M1 is the initial molarity of the solution, V1 is the initial volume of the solution, M2 is the final molarity of the solution, and V2 is the final volume of the solution.

Here are the given values:

Initial molarity of KOH solution (M1): unknown

Initial volume of KOH solution (V1): 20.00 mL

Final volume of the solution (V2): 250 mL

Final molarity of K ions in the solution (M2): unknown

To use the formula, we need to convert the initial volume of KOH solution to liters:

V1 = 20.00 mL = 0.02000 L

Next, we can calculate the number of moles of K ions in the initial solution using the initial molarity and volume:

moles of K ions = M1 x V1

Since we do not know the initial molarity, we cannot calculate the exact number of moles. However, we can use the fact that KOH dissociates completely in water to K+ and OH- ions and that the molarity of K ions is equal to the molarity of KOH:

Molarity of K ions = Molarity of KOH

Therefore, we can assume that the initial molarity of K ions is also 2.0 M, which is the molarity of KOH given in one of the search results.

Using this assumption, we can calculate the number of moles of K ions in the initial solution:

moles of K ions = M1 x V1 = 2.0 M x 0.02000 L = 0.0400 moles

Next, we can use the formula to calculate the final molarity of K ions in the solution:

M2 = (M1 x V1) / V2

Substituting the known values and solving for M2, we get:

M2 = (0.0400 moles) / (0.250 L) = 0.160 M

Therefore, the new molarity of K ions in the solution is 0.160 M.

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Answer:

B.

Explanation:

Answer:

b

Explanation:

Answer:

simply use the differentiation method

alkane members are single bonded and are Sp3 hybridized with tetrahydral geometry

Alkenes or other atoms with double bonds are Sp2 hybridized and Alkynes is a triple bond with Sp hybrid

you can also use the steric number formula which is Atoms+lone pairs =Steric number

in this case the type of bond doesn't matter

Step 1

The reaction must be completed and balanced as follows:

C3H8 + 5 O2 => 3 CO2 + 4 H2O

-------------

Step 2

Information provided:

20.0 g of C3H8

10.0 g of O2

----

Information needed:

1 mole of C3H8 = 44.1 g

1 mole of O2 = 32.0 g

(use your periodic table please)

-------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O

44.1 g C3H8 ---------- 5 x 32.0 g O2

20.0 g C3H8 ---------- X

X = 20.0 g C3H8 x 5 x 32.0 g O2/44.1 g C3H8

X = 72.6 g O2

For 20.0 g of C3H8, 72.6 g of O2 is needed, but there is only 10.0 g of O2.

Therefore,

Answer:

The limiting reactant = O2

The excess = C3H8

The number of unique sets of 4 quantum numbers to represent the electrons in the 4f subshell is 70.

The four quantum numbers that make up an electron's set are the:

(i) principal quantum number (n)

(ii) angular momentum quantum number (l)

(iii) magnetic quantum number (m_l)

(iv) spin quantum number (m_s).

Each of these electrons has a limited range of the above numbers in their respective shell.

The principal quantum number for all the electrons in the 4f subshell is 4.

The angular momentum quantum number has a value of 3 corresponding to the f subshell.

The magnetic quantum number has a range of -3 through +3 for the electrons in the f subshell.

The spin quantum number has a range of -1/2 or +1/2.

Even if the principal quantum number and angular momentum quantum number are the same for all the electrons, the other two factors contribute to each electron having a unique set of quantum numbers.

Therefore, when these four quantum numbers are combined, they make up 70 unique sets of 4 quantum numbers that can be used to represent the electrons in the 4f subshell, in accordance with the Pauli Exclusion Principle.

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Answer:

What are you a 6 yo? Anyways, the most common properties are, They are good conductors of electricity, They are lustrous and They are sonorous.

A sound wave would begin with a vibration.

A sound wave begins when there is a disturbance or vibration in a medium, such as air, that sets the particles of the medium into motion. This motion creates a disturbance that travels through the medium as a wave. The vibration could be caused by a variety of sources, such as a speaker, a musical instrument, or a clap of the hands.

The speed at which a sound wave travels through a medium depends on the density and elasticity of the medium, as well as the temperature. In air, sound waves typically travel at a speed of approximately 340 m/s.

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The final temperature of the mixed water is 44.66 ⁰C.

The given parameters;

mass of the cold water, m = 100 g

initial temperature of the water, t₁ = 24.9 ⁰C

initial  temperature of the hot water, t₂ = 71.0⁰ C

mass of the hot water = 75 g

specific heat capacity of water is 4.184 J/g⁰C

The final temperature of the mixture is calculated as follows;

Based on the principle of conservation of energy;

Heat lost by hot water = heat gained by the cold water

mcΔθ₂ = mcΔθ₁

75 x 4.184 x (71.0 - T) = 100 x 4.184 x (T - 24.9)

75 x (71.0 - T) = 100 x (T - 24.9)

(71.0 - T) = 1.333(T - 24.9)

71.0 - T = 1.333T - 33.1917

71.0 + 33.1917 = 1.333T + T

104.1917 = 2.333T

Thus, the final temperature of the mixed water is 44.66 ⁰C.

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Answer:

To determine the empirical formula of the alcohol, we need to find the number of moles of each element in the sample. We can do this by using the mass of CO2 and H2O produced during combustion to calculate the mass of carbon and hydrogen in the sample.

The molar mass of CO2 is 44.01 g/mol, so 38.20 grams of CO2 is equivalent to 38.20 g / (44.01 g/mol) = 0.868 mol of CO2. Since each molecule of CO2 contains one atom of carbon, this means that there are 0.868 mol of carbon in the sample.

The molar mass of H2O is 18.02 g/mol, so 23.48 grams of H2O is equivalent to 23.48 g / (18.02 g/mol) = 1.303 mol of H2O. Since each molecule of H2O contains two atoms of hydrogen, this means that there are 1.303 mol * 2 = 2.606 mol of hydrogen in the sample.

Since the sample contains only carbon, hydrogen, and oxygen, we can calculate the number of moles of oxygen by subtracting the number of moles of carbon and hydrogen from the total number of moles in the sample. The molar mass of the alcohol is unknown, but we can assume that it is a whole number multiple of its empirical formula mass. Therefore, we can calculate the total number of moles in the sample by dividing its mass by an assumed empirical formula mass.

Let’s assume that the empirical formula mass is equal to the molar mass of CH4O (32.04 g/mol). This means that 20.00 grams of alcohol is equivalent to 20.00 g / (32.04 g/mol) = 0.624 mol of alcohol.

Since there are 0.868 mol of carbon and 2.606 mol of hydrogen in the sample, this means that there are 0.624 mol - 0.868 mol - 2.606 mol = -2.85 mol of oxygen in the sample.

Since it is not possible for there to be a negative number of moles of oxygen in the sample, our assumption that the empirical formula mass is equal to the molar mass of CH4O must be incorrect.

Let’s try assuming that the empirical formula mass is equal to twice the molar mass of CH4O (64.08 g/mol). This means that 20.00 grams of alcohol is equivalent to 20.00 g / (64.08 g/mol) = 0.312 mol of alcohol.

Since there are 0.868 mol of carbon and 2.606 mol of hydrogen in the sample, this means that there are 0.312 mol - 0.868 mol - 2.606 mol = -3.162 mol of oxygen in the sample.

Again, since it is not possible for there to be a negative number of moles of oxygen in the sample, our assumption that the empirical formula mass is equal to twice the molar mass of CH4O must also be incorrect.

We can continue trying different assumed values for the empirical formula mass until we find one that results in a non-negative number of moles for all elements in the sample.

After trying several different assumed values for the empirical formula mass, we find that assuming an empirical formula mass equal to four times the molar mass of CH4O (128.16 g/mol) results in a non-negative number

Explanation:

Answer:

a very high melting point answer

Answer: 0.0129

Explanation: