this method of acquiring mw differs from sec and gives dosy nmr many advantages over sec. as stated before, molecules of specific sizes produce indi-vidual diffusion coefficients. due to low sample con-centration, the purity of polymer is not as essential compared to sec; thus, reducing preparation time. dosy also requires minimum amounts of solvent

Answer:

Yes the reaction occur when aqueous solutions happened

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

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Answer:

1.67

Explanation:

Mass÷mr=moles

3÷18=1.67

0.5 mL of serum with 1/20 dilution will be equivalent to 10 mL of the diluted serum.

A 1/20 dilution means 1 part of the original solution and 19 parts of the solvent that is being used to dilute.

Now, a 1/20 dilution of a 0.5 mL serum means that the 1 part of the stock solution is 0.5 mL. The remaining 19 parts would be in multiples of 0.5 mL.

         19 x 0.5 = 9.5 mL.

This means that 9.5 mL of the diluting solvent will be added to 0.5 mL of the stock solution resulting in a total of 10 mL.

In order words, 1/20 dilution of 0.5 mL of serum will make a total volume of 10 mL.

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digestion

does that answer it?

The relationship between the rate of diffusion r, and d is r ∝ 1/√d.

The relationship between the rate of diffusion (r) and the density of a gas (d) can be explained using Graham's law of diffusion. According to this law, the rate of diffusion of a gas is inversely proportional to the square root of its density. Mathematically, it can be expressed as:

r ∝ 1/√d

where the symbol '∝' represents 'proportional to'. The constant of proportionality (k) can be introduced to this equation as:

r = k/√d

This equation shows that as the density of a gas increases, its rate of diffusion decreases. This is because denser gases have more molecules per unit volume and thus, they experience greater intermolecular collisions that hinder their movement. Therefore, it requires more energy for them to diffuse through a medium compared to less dense gases.

The relationship between the rate of diffusion and density is particularly important in understanding the behavior of gases in different environments. For instance, in a gas chromatography column, the rate of diffusion of a gas determines how quickly it moves through the column and separates from other components. Similarly, in the Earth's atmosphere, the rate of diffusion of greenhouse gases such as carbon dioxide affects their concentration and hence, their impact on climate change.

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To solve such this we must know the concept of combination reaction. Therefore, the given reaction CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr is a combination reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr

The above reaction is a combination reaction. In combination reaction, more than one reactant combine to form a product. Because new chemicals are created during combination reactions, they are often referred to as synthesis.

Therefore, the given reaction is a combination reaction.

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The two functional groups that the aminoacid has according to the picture are amine and carboxyl.

In chemistry and related areas, a functional group can be defined as a group of atoms bonded in a specific molecule that can affect the was the molecule reacts or the specific behavior of it.

In the case of the molecule presented, which is an amino acid, two functional groups can be identified:

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plot(density(x),col = "blue") #As we can see the distribution is fairly Normal

q q line(x, col = "blue") #In Q Q P Lot the straight blue line should pass through maximum number of point at 45 degree (x, col = "blue", freq = FALSE)

lines(density(x), col = "red", lwd = 2) #We can also check distribution of Normal by Histrogram and superimpose red line

ad .test(x) #Anderson Darling test gives p value 0.1424 that mean there is 14.24 percent chance that his data is coming from Normal

t(x) Cramer-von Mises test gives p value 0.2147 that mean there is 21.47 percent chance that his data is coming from Normal

Llliefors (Kolmogorov-Smirnov) test gives p value 0.2355 that mean there is 23.55 percent chance that his data is coming from Normal

Pearson chi-square test gives p value 0.7301 that mean there is 73.01 percent chance that his data is coming from Normal

Shapiro- Francia test gives p value 0.03482 that mean there is 3.48 percent chance that his data is coming from Normal

Shapiro-Wilks test gives p value 0.07154 that mean there is 7.15 percent chance that his data is coming from Normal

#If p-value <= Alpha(=0.05) reject null hypothesis(i.e sample points comes from Normal Population) but we take Shapiro-Wilks test into account because it is distribution free and regarded as best test for Normality hence we accept the null hypothesis and conclude that the sample comes from Normal Distribution but it is not very much likely.

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Answer

Explanation

Given

number of moles = 4.00 moles

Volume = 3.00 L

Required: Molarity

Solution

C = n/V C is the molarity/concentration, n is the moles and V is the volume

C

Answer:

D. -80m/s^2

Explanation:

V = u + at

5 = 65 + a (0.75)

0.75a = -60

a = -60/0.75

a = -80m/s^2

Therefore, is decelerating at 80m/s^2

Answer:

\(\boxed {\boxed {\sf D. \ 80 \ m/s^2 \ down}}\)

Explanation:

We are asked to find the acceleration of a skydiver. Acceleration is the change in velocity over the change in time, so the formula for calculating acceleration is:

\(a= \frac{v_f-v_i}{t}\)

The skydiver was initially traveling 65 meters per second, then he slowed down to a final velocity of 5 meters per second. He slowed down in 0.75 seconds.

\(\bullet \ v_f = 5 \ m/s \\\bullet \ v_i= 65 \ m/s \\\bullet \ t= 0.75 \ s\)

Substitute the values into the formula.

\(a= \frac{ 5 \ m/s - 65 \ m/s}{0.75 \ s}\)

Solve the numerator.

\(a= \frac{-60 \ m/s}{0.75 \ s}\)

Divide.

\(a= -80 \ m/s^2\)

The acceleration of the skydiver is -80 meters per second squared or 80 meters per second squared down. The skydiver is slowing down or decelerating, so the acceleration is negative or down.

Answer:I think its hydrogen dioxide, but I'm not sure

Explanation:

I don't know if that is correct though

Answer:

To find the mass of the solute in the solution, we first need to convert the percent to a decimal by dividing by 100. Since the percent is 4%, we can divide by 100 to get 0.04.

Next, we can multiply the decimal value by the total mass of the solute to find the mass of the solute in the solution. In this case, the total mass of the solute is 200g, so we can multiply 0.04 by 200g to get:

0.04 * 200g = 8g

Therefore, the mass of the solute in the solution is 8g.

Answer:

used by plants to make protein

Explanation:

so B

Answer:

C dispersion , dipole and hydrogen bond

Explanation:

Answer:

C dispersion , dipole and hydrogen bond

Explanation:

Give the other guy brainliest!

The container's building bricks are a type of material known as a mixture since it consists of two different components.

A mixture of two chemicals would be the kind of substance represented in the diagram. This is so because the first brick is made of two separate elements, one of which is yellow and the other of which is black. The other block has a red and blue color scheme to indicate that it is also a composite made up of two separate elements.

Chemical reactions between two or more elements can result in the formation of compounds. Physical mixing of two or more substances results in the formation of mixtures. 2. Types. Three categories of compounds are possible.

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The volume of carbon dioxide produced is approximately (d) 11.9 liters.

To determine the amount of carbon dioxide (C\(O_2\)) produced when 37.8 grams of carbon disulfide (C\(S_2\)) reacts with excess oxygen gas (\(O_2\)), we need to use stoichiometry and the given balanced chemical equation:

C\(S_2\)(l) + 3\(O_2\)(g) → C\(O_2\)(g) + 2S\(O_2\)(g)

First, we calculate the number of moles of C\(S_2\) using its molar mass:

Molar mass of (C\(S_2\)) = 12.01 g/mol (C) + 32.07 g/mol (S) × 2 = 76.14 g/mol

Number of moles of (C\(S_2\)) = mass / molar mass = 37.8 g / 76.14 g/mol ≈ 0.496 mol

From the balanced equation, we can see that the stoichiometric ratio between (C\(S_2\)) and C\(O_2\) is 1:1. Therefore, the number of moles of C\(O_2\) produced will also be 0.496 mol.

Now we can use the ideal gas law to calculate the volume of C\(O_2\) at the given temperature and pressure. The ideal gas law equation is:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

Converting the temperature from Celsius to Kelvin:

T(K) = 28.85°C + 273.15 = 302 K

Using the ideal gas law:

V = nRT / P = (0.496 mol) × (0.0821 L·atm/mol·K) × (302 K) / (1.02 atm) ≈ 11.9 L

The correct answer is 11.9 liters.

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Answer:

Decreases

Explanation:

To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.

Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).

If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.

The purpose of the cotton wool plug on the conical flask is to permit the free passage of air over the edge of the flask and prevent the establishment of semi-anaerobic conditions in the culture. It can also be used to allow gases produced during a reaction to escape while preventing contaminants from entering the flask.

Answer:

1.29

Explanation:

You have to find the equation which is d=m/v. d is 9.43=12.2/v. You have to solve for v which you get 1.29

1.29 \(cm^3\) is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

Density is the measurement of how tightly a material is packed together.

Density =Mass ÷ volume

9.43=12.2 ÷  V

V = 1.29 \(cm^3\)

Hence, 1.29 \(cm^3\) is the volume of a 12.2 g piece of metal with a density of 9.43 g/cm.

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The density, in g/L, of an ideal gas when it is at 1.48 atm and 94.06 °C is 6.67g/L.

The density of an ideal gas can be calculated by dividing the mass of the substance by its volume in litres.

According to this question, the pressure and temperature of the ideal gas is given. The number of moles occupied by the gas can be calculated as follows;

PV = nRT

1.48 × 22.4 = n × 0.0821 × 367.06

33.152 = 30.14n

n = 1.1 moles

mass of gas = 1.1 mol × 145.63g/mol = 160.18g

Density = 160.18g ÷ 22.4L = 6.67g/L

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Answer:

Atoms can be neither created nor destroyed in chemical reactions.

Answer:

D.) State the question, form a hypothesis, conduct an experiment

Explanation:

https://www.colorincolorado.org/article/steps-scientific-process

Answer:

The reaction that takes place in a nuclear fission reactor is answer D.

Explanation:

Step-by-step explanation:

Nuclear fission reactions involves the process by which large atomic nuclei are bombarded with energetic particles and release of an enormous amount of nuclear energy, which  mainly ends up as heat energy.

So now, consider the nuclear reaction from D, after the uranium nucleus absorbs the neutron its split into two smaller nuclei (often radioactive themselves), Krypton and Barium and releases more neutrons (or energy).

Assuming it is Pb(NO3)2, in this case, in order to name this compound, we need to know what each element are named separately, this is usually 90% of the work when we have to name compounds. Pb is the element Lead, and NO3 is the nitrogen oxoanion Nitrate, now because Pb is a transition metal, it has a few possible oxidation numbers (the charge when it bonds with another element), and because of these multiple possibilities, we need to identify the charge of Pb when we name it, since we have NO3, and nitrate has a charge of -1, and we have 2 Nitrates, the charge of Pb, in order to counterbalance it, is +2, now, naming the compound, we will have:

Lead (II) nitrate

The bond type it will be an Ionic bond, since we have different charges

Answer:

0.5g/cm^3

Explanation:

Density = Mass / Volume

Density = 20g / 42cm^3

Density = 0.476g/cm^3

note*: round to the nearest sigfig

Answer is: 0.5g/cm^3

The box's volume is 42cm³ and the mass is 20g then the density is 0.5g/cm³.

The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however the Latin letter D may also be used. Density is calculated mathematically by dividing mass by volume.

How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au).

Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. As long as an object's density is lower than the liquid's density, it will often float.

Density = Mass ÷ Volume

Density = 20g ÷ 42cm³

Density = 0.476g/cm³

= 0.5g/cm³

Thus, the density is  0.5g/cm³.

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The half-life of a reaction is the time it takes for the concentration of a reactant to decrease to half its initial value. In a first-order reaction, the rate of the reaction is directly proportional to the concentration of the reactant. This means that the rate of the reaction depends on the concentration of compound A.

To calculate the half-life of compound A, you can use the equation:

half-life = (ln(2)) / k

where k is the rate constant for the reaction.

Plugging in the values given in the question, we get:

half-life = (ln(2)) / 0.45

This simplifies to:

half-life = 1.44 / 0.45

Which gives us a final result of:

half-life = 3.2 hours

So the half-life of compound A at 250°C is approximately 3.2 hours.

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Answer:

2NaF + 1Br2 -> 2NaBr + 1F2

Explanation:

2NaF + 1Br2 -> 2NaBr + 1F2

I simply looked at both the left side and right side and saw there was only 1 F on the left side while there were 2 on the right side.

This means we have to make the left side have 2 F by multiplying NaF by 2.

However, this means there are now 2 Na as well. Going back to the right side, I multiplied NaBr by 2 so that there are 2 Na on both sides.

Now there are 2 Br on the right side. Checking back to the left side, there are also 2 Br, meaning this equation is now balanced.