2. Calculate the molality of a water solution if the freezing point is: (a)-9. 3°C (b)-27. 9 °C

Density function: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

Mean: μ = 115.

Variance: σ^2 = 25/3.

Probability: P(112 < X < 115) = 0.3.

Given that the melting point X is uniformly distributed over the interval [110, 120], we can find the density function, mean, variance, and probability as follows:

1. Density function:

Since X is uniformly distributed, the density function f(x) is constant within the interval [110, 120] and zero outside that interval. To find the density function, we need to determine the height of the constant density.

The total length of the interval is 120 - 110 = 10.

Since the density function is constant, the area under the density function curve must be equal to 1.

Therefore, the height of the constant density is 1 divided by the length of the interval: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

2. Mean:

The mean (μ) of a uniform distribution is the average of the endpoints of the interval. In this case, the mean is (110 + 120) / 2 = 115.

3. Variance:

The variance (σ^2) of a uniform distribution is calculated using the formula: σ^2 = (b - a)^2 / 12, where a and b are the endpoints of the interval. In this case, the variance is (120 - 110)^2 / 12 = 10^2 / 12 = 100/12 = 25/3.

4. Probability:

To find P(112 < X < 115), we need to calculate the area under the density function curve between the points 112 and 115.

Since the density function is constant within the interval [110, 120], the probability is equal to the ratio of the length of the interval [112, 115] to the length of the entire interval [110, 120].

The length of the interval [112, 115] is 115 - 112 = 3.

The length of the entire interval [110, 120] is 120 - 110 = 10.

Therefore, P(112 < X < 115) = (3 / 10) = 0.3.

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Answer:

0.069 moles of glucose

Explanation:

(0.138 mol/L)(0.5 L) = 0.069 moles of glucose

Answer:

\(\boxed {\boxed {\sf 0.069 \ mol \ C_6H_12O_6}}\)

Explanation:

Molarity is the moles per liter of a solution. It is found by dividing the moles of solute (glucose) by the liters of solution (water).

\(M= \frac {moles}{liters}\)

We know the molarity is 0.138 M. 1 M is equal to 1 mole per liter, so we can rewrite the molarity as 0.138 moles per liter.

There are 0.5 liters of solution.

We are solving for the moles, so we can use x.

\(0.138 \ mol/L= \frac {x }{0.5 \ L}\)

We must isolate the variable (x) to solve for the moles. It is being divided by 0.5 liters. The inverse operation of division is multiplication. Multiply both sides of the equation by 0.5 L.

\(0.5 \ L *0.138 \ mol/L= \frac {x }{0.5 \ L}* 0.5 \ L\)

The liters on both sides cancel.

\(0.5 *0.138 \ mol= {x }\)

\(0.069 \ mol =x\)

\(0.069 \ mol \ C_6H_12O_6\)

Ther are 0.069 moles of glucose in a 0.138 M solution with 0.5 liters of water.

If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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The mass of CO2 produced from the combustion of 14.7 kg of the hydrocarbon mixture is: 1.40 kg

Hydrocarbons are organic compounds that only contain hydrogen and carbon atoms. The given hydrocarbon mixture contains 31.4% hexane (C6H14), 14.6% octane (C8H18), and 54.0% heptane (C7H16). When combusted in the presence of excess oxygen, they generate carbon dioxide (CO2) and water (H2O).

In order to calculate the mass of CO2 produced from the combustion of 14.7 kg of the hydrocarbon mixture, we need to first determine the number of moles of each hydrocarbon present. Then, we will use the balanced chemical equation for the combustion of hydrocarbons to determine the moles of CO2 produced, and finally, convert the moles of CO2 to its mass.

Let's start by finding the number of moles of each hydrocarbon present in the mixture: Moles of hexane (\(C6H14) = 0.314 x 14.7 kg / 86.18 g/mol = 6.51 moles\)

Moles of octane \((C8H18) = 0.146 x 14.7 kg / 114.23 g/mol = 1.17 moles\)

Moles of heptane\((C7H16) = 0.54 x 14.7 kg / 100.21 g/mol = 8.17 moles\)

Now, we can use the balanced chemical equation for the combustion of hydrocarbons to determine the number of moles of CO2 produced: \(2CnH2n+2 + (3n+1)O2 → 2nCO2 + (n+1)H2O\)

For each mole of hydrocarbon combusted, 2 moles of CO2 are produced.

Therefore, the total number of moles of CO2 produced can be calculated as:

Moles of \(CO2 = 2 x (6.51 + 1.17 + 8.17) = 31.7 moles\)

Finally, we can use the molar mass of CO2 (44.01 g/mol) to convert the moles of CO2 to its mass: Mass of \(CO2 = 31.7 moles x 44.01 g/mol = 1396 g or 1.40 kg\). Therefore, the mass of CO2 produced from the combustion of 14.7 kg of the hydrocarbon mixture is 1.40 kg.

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Question:

If butane had a volume of 500 ml. at a pressure of 1.5 atm and a temperature of 20 °C, what would the new volume of the gas be at a temperature of 30 °C and a pressure of 500 Torr?

Solution Given:

Let P be the pressure V be volume and and T be temperature.

Volume of Butane [\(V_1\)] = 500 ml

Pressure of Butane [\(P_1\)] = 1.5 atm

Temperature [\(T_1\)] =20°C=20+273=293K

New Volume of Butane [\(V_2\)] = ?

New Pressure of Butane [\(V_2\)] =500 Torr=500*0.00131579=0.657895 atm

Note: 1 Torr= 0.00131579 atm

New Temperature of Butane [\(V_2\)] =30°C=30+273=303K

Now

By using combined gas law equation:

\(V_2=V_2*\frac{P_1*T_2}{P_2*T_1}\)

\(V_2=500*\frac{1.5*303}{0.657895*293}=1178.9 ml\)

The new volume of Butane is 1178.9 ml

To make a buffer with pH 4.76 from 500 mL of 0.1 M solution of sodium acetate, you can add 25 mL of the 1 M solution of HCl to it.

According to the Henderson-Hasselbalch equation used for the calculation of buffer pH:

\(pH = pK_{a} + log\frac{[base]}{[acid]}\)
when the pH = pKa (as is here) then:

\(log\frac{[base]}{[acid]} = 0\)
so:
\(\frac{[base]}{[acid]}=1\)

This means that [base]=[acid]. The easiest way to generate acid here (because sodium acetate is the basic component), is to add strong acid to the solution, which will effectively transform sodium acetate into acetic acid.

The amount of acid needed is equal to half of the starting amount of sodium acetate:

c = n/V, so n = c * V = 0.1 M * 0.5 L = 0.05 mol of NaOAc

0.05 mol / 2 = 0.025 mol of HCl

In order to add the smallest volume of acid possible (so as to not reduce buffer capacity), we can use 1 M solution of HCl.

c = n/V, so V = n/c = 0.025 mol / 1 M = 0.025 L = 25 mL of 1 M HCl

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Answer:

Explanation:

Proteins have two main secondary structures: alpha helices, which are spirals formed by hydrogen bonds between amino acids, and beta pleated sheets, [ which are formed by a bend in the amino acid with alternating hydrogen bonding between amino acids.

Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

Agroecology refer to an approach that use ecological processes in agricultural production systems.

The benefits of Agroecology is that it help to protect, restore and also improve agriculture and food systems when there is climate shocks and unfavorable weather conditions.

Therefore, Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

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If there are 0.505 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the concentration of the original solution is  0.673 M.

The correct answer is option e. 0.673 M.

The concentration of the original solution, we need to use the formula:  concentration = amount of solute / volume of solution. First, we need to convert the mass of NaCl to moles. The molar mass of NaCl is 58.44 g/mol.
0.505 g NaCl x (1 mol NaCl/58.44 g NaCl) = 0.00863 mol NaCl.

First, we need to find the number of moles of NaCl. To do this, we will use the molar mass of NaCl (58.44 g/mol). Moles of NaCl = mass (g) / molar mass (g/mol) = 0.505 g / 58.44 g/mol ≈ 0.00864 mol, 2. Next, we will convert the original volume of the solution from mL to L. 75.0 mL = 75.0 / 1000 L = 0.075 L, 3. Finally, we will find the concentration (molarity) of the original solution. Concentration (M) = moles of solute / volume of solution (L) = 0.00864 mol / 0.075 L ≈ 0.115 M
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Answer:

8.3

Explanation:

Answer:

Magma

Explanation:

If you’re talking about what erupts from a volcano then lava but the lava turns into magma when it hardens

Answer:

Lava

Explanation:

When magma erupts from the volcano it becomes lava

The molarity of copper sulfate in the diluted solution if 4 ml of 0.0250 m cuso4 is diluted to 10.0 ml with pure water is 0.02M.

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

Mathematically,

Molarity = moles of solute / volume of solution

Given,

Initial volume of CuSO4 = 4 ml = 4/1000 = 0.004 l

Molarity of CuSO4 = 0.0250 m

By substituting all the values, we get

0.025 = moles/ 0.004

moles = 0.025 × 0.004 = 0.000100 mol

Moles = 0.0001 mol.

Total volume = 0.004 l + 10 ml

= 0.004 + 0.001 = 0.005 l

Moles of CuSO4 = 0.0001 mol

Molarity = 0.0001 / 0.005 = 0.02 M

Thus, we concluded that the molarity of copper sulfate in the diluted solution if 4 ml of 0.0250 m cuso4 is diluted to 10.0 ml with pure water is 0.02M.

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Answer: The Molecules that make up maple syrup have a harder time moving past one another because they are larger than the molecules that make up orange juice

Explanation:Ap3x

The correct statement about the viscocity of the maple syrup is that the Molecules that make up maple syrup have a harder time moving past one another because they are larger than the molecules that make up orange juice.

The resistance of a fluid (liquid or gas) to a change in shape or movement of adjacent sections relative to one another is called viscosity. Viscosity indicates resistance to flow.

Hence the correct statement is that the Molecules that make up maple syrup have a harder time moving past one another because they are larger than the molecules that make up orange juice.

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Answer:

=0.475M

Explanation:

Molarity=(moles of solute))/(litres of solution)

So, molarity in this question:

=(0.19 moles of sodium carbonate)/(0.4 L of solution)

=0.475M

~Hope this helps:)

The oxidizing agent are the substance that is reduced because it gains electrons.

An oxidizing agent is defined as the agent that is capable of undergoing oxidation reaction by losing an electron.

The following are the characteristics of an oxidizing agent:

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Answer:

D: the substance that is reduced because it gains electrons.

Explanation:

Answer:

To solve this problem, we can use the dilution formula: M1V1 = M2V2 Where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume. We are given that the initial molarity is 0.99M and the initial volume is 3.4 L. We can use this information to find M2: M1V1 = M2V2 (0.99M)(3.4 L) = M2(6.3 L) M2 = (0.99M)(3.4 L) / (6.3 L) M2 = 0.5357 M Therefore, the molarity of a 6.3 L dilution of a 0.99M solution with an initial volume of

Answer:

0.534 M.

Explanation:

Molarity is a measure of the concentration of a solution, defined as the number of moles of solute per liter of solution. When a solution is diluted by adding more solvent, the number of moles of solute remains the same, but the volume of the solution increases, resulting in lower molarity.

In this case, you have a 3.4 L solution with a molarity of 0.99 M. This means that the number of moles of solute in this solution is 3.4 L * 0.99 mol/L = 3.366 moles.

If you dilute this solution to a final volume of 6.3 L by adding more solvent, the number of moles of solute remains the same (3.366 moles), but the volume has increased to 6.3 L. So the molarity of the diluted solution is 3.366 moles / 6.3 L = 0.534 M.

Answer:

it would ether be gray to black or silver to gray and black

Explanation:

because of my calculation ekasillicon would be that color because of the eyes and because of your color seeing .

Yes, Oxygen and sodium have an ionic bond.

Ionic bonding, a type of chemical bonding that involves the electrostatic attraction between two atoms or ions with radically different electronegativities, is the primary interaction occurring in ionic compounds.

Since sodium is a component of an alkali and oxygen is merely a non-metal and a gas, an ionic connection is created. As an example, the reaction between sodium and oxygen can produce sodium oxide. Sodium atoms are converted into sodium ions to produce the ionic compound sodium oxide. Atoms of sodium undergo oxidation, which results in the loss of electrons.

Na + O2 → NaO2 or 4Na + O2 → 2Na2O (s).

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The mass of sodium chloride at the two parts are mathematically given as

Generally, the equation for ideal gas is mathematically given as

PV=nRT

Where the chemical equation is

F2 + 2NaCl → Cl2 + 2NaF

Therefore

1.50x15=m/M *(1.50*0.0821)

1-50 x 15=m/58.5 *(1.50*0.0821)

m=10,688.18g

Part 2

PV=m'/MRT

1*15=m'/58.5*0.0821*273

m'=39.15g

mass of Nacl(m)=m'=39.15g

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Answer:

The conventional oven and the convection oven are confused with each other due to their similar look and style, and a lot of their functioning is quite the same as well.

The conventional ovens have existed for over half a century, and have derived their functioning from traditional ovens that are over 4,000 years. They function with a bottom-up heat transfer from a fixed burner source.

The convection ovens were made recently as a way to get better heating results for all types of dishes and recipes, with the introduction of a fan system along with an exhaust which allows the circulation of hot air around the cavity of the oven.

Explanation:

1. a

2. a

3. b

4. b

5. c

6. a

7. c

Answer:

imma say A and C

Explanation:

bc that's the formula    for speed, sorry if it's wrong

Answer:

Sexual and Asexual Reproduction

Explanation:

LOL

Answer:

oppositely charged ions in a chemical compound

Explanation:

Answer:

Between ions

Explanation:

The concentration of the solution that results from mixing 40.0 mL of 0.200M HCl with 60.0 mL  of 0.100M NaOH is: NaCl=0.06m, HCl=0.02m

To find the concentration of the resulting solution, we need to determine the moles of the substances involved and then calculate the new concentration based on the total volume of the solution.

Given:

Volume of HCl (V1) = 40.0 mL

Concentration of HCl (C1) = 0.200 M

Volume of NaOH (V2) = 60.0 mL

Concentration of NaOH (C2) = 0.100 M

HCl+NaOH→NaCl+H2O

Moles ⇒(40×0.2)(60×0.1)                  

                8                    6

\(\[ [NaCl] = \frac{6 \times 10^{-3}}{100 \times 10^{-3}} \, \text{l} \]\)

\(\[ [HCl] = \frac{2 \times 10^{-3}}{100 \times 10^{-3}} \, \text{l} \]\)

NaCl=0.06m

HCl=0.02m

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The correct answer is

1,4-dichloro-2-pentanone

The name of the given molecule will be "1,4-dichloro-2-pentanone".

A molecule represents the tiniest unit of a material that keeps its content and properties. It must be made up of two or more atoms that have been joined together by chemical bonds.

This molecule will be made by carbon, oxygen , hydrogen and oxygen molecule.

It can be seen that given molecule has 5 carbon atom in which 1 and 4 position of carbon atom chlorine atom is present and at 2 carbon oxygen atom is presence. that's why the name of the given molecule will be "1,4-dichloro-2-pentanone".

In this molecule one ketone and two halogen (Cl) groups are present that's why it can be consider as keto halogen compound.

The molecular formula of this compound can be written as \(C_{5} H_{10} Cl_{2} O\). Presence of oxygen molecule indicate that keto group should be present in the given molecule . So the name of the compound should be  1,4-dichloro-2-pentanone

Therefore, the correct answer will be option (C).

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