Benzoic acid is in the process of being recrystallized. Your lab partner is in a hurry and after the impure benzoic acid is dissolved, they quickly submerge the flask in an ice bath and see crystals. Besides possibly breaking the flask, what would be the problem with this technique

Answer:

Simply carry out the mixed melting point procedure

1 here grind the two substances mix them

2.take note of the melting point of the mixture this is P

3 also get the original product from a different source okay this is Q

4.so I the melting point of P = Q then they represent a similar compound

5. But if melting point of P is not equal to Q then one of the compounds is P is acting as an impurity so they are not the same

The compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

The melting point can be defined as the temperature of the substance when it has been converted from the solid state to the liquid state.

The two substances were found to have the same melting point. The compounds have been determined whether they are similar or not by the determination of the melting point of the combined mixtures.

The compounds A and B have been mixed together, and the melting point has been determined. The similar compounds in mixing will give the same melting point. While if the compounds are different, there has been a shift in the melting point of the mixture.

Thus, the compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

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Answer:

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Answer:

72.45 mmol K⁺ and 36.225 mmol Cr₂O₇²⁻

Explanation:

It is possible to obtain millimoles of a substantce by the multiplication of molarity times milliliters of the solution.

In the solution that is 0.0750M K₂Cr₂O₇:

K⁺ = 0.0750M * 2 = 0.150M

Cr₂O₇²⁻ = 0.0750M

The millimoles of these ions are:

Millimoles K⁺:

483mL * 0.150M = 72.45 mmol K⁺

Millimoles Cr₂O₇²⁻:

483mL * 0.075M  = 36.225 mmol Cr₂O₇²⁻

Answer:

i dont have much detail, but im pretty sure it would be at a boil/vaporizing phase.

Answer:

The value is [tex]U =1.3908 *10^{11} \ kg [/tex]

Explanation:

From the question we are told that

mass of carbon dioxide produced by one gallon of gasoline is [tex]m = 9.50 \ kg[/tex]

The number of cars is [tex]N = 40 \ million = 40 *10^{6} \ cars[/tex]

The distance covered by each car is [tex]d = 7930 \ mi[/tex]

The rate is [tex]R = 23.6 \ mi/ gallon[/tex]

Generally the amount of gasoline used by one car is mathematically represented as

[tex]G = \frac{d}{R}[/tex]

=> [tex]G = \frac{7930}{23.6}[/tex]

=> [tex]G = 366 \ gallons [/tex]

Generally the amount of gasoline used by N cars is

[tex]H = N * G[/tex]

=> [tex]H = 40*10^{6} * 366[/tex]

=> [tex]H = 1.464*10^{10} \ gallons [/tex]

Generally the annual production of carbon dioxide is mathematically represented as

[tex]U = m * H[/tex]

=> [tex]U =9.50 * 1.464*10^{10}[/tex]

=> [tex]U =1.3908 *10^{11} \ kg [/tex]

Explanation:

kg = Ibs/2.2046 (from internet)

kg = 295/2.2046

= 133.81 kg

Answer:

[tex]\°C=5.8x10^3\°C[/tex]

[tex]\°F=1.1x10^4\°F[/tex]

Explanation:

Hello,

In this case, for the calculation of the temperature in degree Celsius we subtract 273.15 to the given temperature in kelvins:

[tex]\°C=6100-273.15\\\\\°C=5.8x10^3\°C[/tex]

Next, by applying the following equation we compute it in degree Fahrenheit:

[tex]\°F=(5.8x10^{3}*9/5) + 32\\\\\°F=1.1x10^4\°F[/tex]

Clearly, since the initial unit has two significant figures the computed units also show two significant figures.

Regards.

Answer:

225 for both answers

Explanation:

The only reason i know this is because i got it wrong. 225

Answer:

225J on both of the questions.

Answer:

Explanation:

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

From the question

mass of metal = 54.52 g

Volume of metal = new volume - original volume of water in the cylinder

That's

new volume = 28.85 mL

original volume of water = 23.44 mL

Volume of metal

= 28.85 - 23.44 = 5.41 mL

Next we convert the volume from mL to cm³

1 mL = 1 cm³

5.41 mL = 5.41 cm³

Substitute the values into the above formula and solve

That's

We have the final answer as

Hope this helps you

Answer:

A) H2O > HCCH > NH3 > CH3CH3

Explanation:

H2O is known as a neural compound which a pH close to 7.0. This however makes it more acidic due to it having the lowest pH when compared to the others in the option.

The other options however have their acidic strength as follows: HCCH > NH3 > CH3CH3. This explains why the pattern of decreasing acidic strength is H2O > HCCH > NH3 > CH3CH3

Answer:

The correct answer is B. Transport water.

Explanation:

I did this quiz. :)

Xylem transport water. Therefore, the correct option is option B among all the given options. The vascular tissue of plants called xylem.

The vascular tissue of plants called xylem transports water plus dissolving minerals from the roots towards the rest of the plant while also offering structural support. The tracheary components, a collection of specialized, water-conducting cells, make up xylem tissue.

All vascular plants, along with the seedless club mosses, fern, horsetails, all angiosperms (flowering plants), and gymnosperms, include xylem in addition to phloem (tissue that transports glucose from the leaves to the rest of the plant) (plants with seeds unenclosed in an ovary). Xylem transport water.

Therefore, the correct option is option B.

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Answer:

manganese has greater ionization energy than Selenium

Answer:

scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis. The process of the scientific method involves making conjectures.

Answer:

a) the element belongs to group 2

b) see image attached

c) Magnesium

d) X3N2

Explanation:

Any ion with the formula X^2+ was derived from group 2 elements. The group two element found in period 3 is magnesium alone.

Since the nitride ion has a valency of -3 and X^2+ has a valency of +2 , then a compound formed between X^2+ and the nitride ion will have the formula X3N2.

a. The group number of the element can be determined by knowing the charge of the ion. In the ion X2+ has a charge of 2+. Since representative elements typically form ions with charges equal to their group numbers, we can conclude that the group number of the element X is 2.

b. The electron-dot symbol, also known as Lewis dot symbol, represents the valence electrons of an element. Since X is a representative element in Group 2, it has two valence electrons.

c. If X is in Period 3, it could be one of the elements from Group 2 in that period. The most likely element would be Magnesium (Mg), as it is the representative element in Group 2 of Period 3.

d. The nitride ion has a charge of 3-. To form a neutral compound, the charges of X and the nitride ion must balance out. Since X has a charge of 2+ and the nitride ion has a charge of 3-, we need two X ions to balance the charge of three nitride ions. Therefore, the formula of the compound formed from X and the nitride ion is X3N2.

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Answer:

1) The overlap of the p orbitals of the carbon-carbon π bond would be lost

Explanation:

Unlike simple bonds, a double bond can not rotate, since it is not possible to twist the ends of the molecule without breaking the π bond.

In the structure of but-2-ene present in the attachment, we can see the two isomers, cis and trans. These isomers cannot be interconverted by rotation around the carbon-carbon double bond without breaking the π bond.

Answer:

Living Space get food or nutrients, water, and shelter. No matter where an organism lives, it must provide what it needs to survive.

Explanation:All organisms need a place to live, and store energy to take care of itself.

Answer:

pH=3.40

Explanation:

For this question, we can start with the general ionization reaction of a general acid:

[tex]HA~<->~A^-~+~H^+[/tex]

The acids can produce the hydronium ion ([tex]H^+[/tex]). If we can to calculate the pH we have to use the equation:

[tex]pH=-Log[H^+][/tex]

So, if we want to calculate the pH value we have to know the concentration of the hydronium ion. For this, we can check the percentage of ionization. If we have 0.2 % of ionization, we will have only  0.2 % of hydronium ions from the initial concentration. In other words, we can calculate the concentration of [tex]H^+[/tex], if we do the 0.2% of the initial concentration, so:

[tex]0.2~M*\frac{0.2}{100}~=~0.0004~M[/tex]

With the concentration we can calculate the pH:

[tex]pH=-Log[0.0004~M]~=~3.40[/tex]

The pH value is 3.40

I hope it helps!

Answer:

y = 35.06 %.

Explanation:

The reaction of fermentation is:

C₆H₁₂O₆  →  2C₂H₅OH + 2CO₂      (1)        

From the reaction (1) we have that 1 mol of C₆H₁₂O₆ produces 2 moles of C₂H₅OH, then the number of moles of C₂H₅OH is:

[tex]n = \frac{2 moles C_{2}H_{5}OH}{1 mol C_{6}H_{12}O_{6}}*1 mol C_{6}H_{12}O_{6} = 2 moles C_{2}H_{5}OH[/tex]

Now, we need to find the mass of C₂H₅OH:

[tex]m = n*M = 2 moles*46.07 g/mol = 92.14 g[/tex]  

Finally, the percent yield of C₂H₅OH is:

[tex] \% = \frac{32.3 g}{92.14 g}*100 = 35.06 \% [/tex]

Therefore, the percent yield of C₂H₅OH is 35.06 %.

I hope it helps you!

The percent yield of C2H5OH should be 35.06% also it have the 1.00 moles.

Since

The reaction of fermentation should be

C₆H₁₂O₆  →  2C₂H₅OH + 2CO₂      (1)        

Here  1 mol of C₆H₁₂O₆ generated 2 moles of C₂H₅OH, so the number of moles of C₂H₅OH should be

= 2 moles / 1mole * 1 mole

= 2 moles C₂H₅OH

So here the percent yield should be

= 32.3 / (2 * 4607)

= 32.3 / 92.14

= 35.06%

Hence, The percent yield of C2H5OH should be 35.06% also it have the 1.00 moles.

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Answer:

Please find the detailed explanation below

Explanation:

A scientific method is a sequence of steps that is used to solve a problem. Every scientific method begins with a problem that needs to be solved.

Hence, in order to determine whether water really does take longer to boil if you are watching it, we employ the steps involved in a scientific method.

1) Ask a question/Make observation: This must initiate the process. The observation/question made here is that DOES WATER TAKE LONGER TIME TO BOIL WHEN WATCHED?

2. Formulating hypothesis; an hypothesis is a testable prediction of a possible solution to the stated problem. In this case, an hypothesis could read: IF water is watched while boiling, THEN it will take a longer time to boil. A hypothesis must be tested for it to be proved or disproved.

3. Test hypothesis: The formulated hypothesis is tested via conducting an experiment. The set up of the experiment can involve one group where water is boiled while watching it and another where water is boiled without watching. The former group is called Experimental group, while the latter group is called Control group. The time it takes for each group of water to boil will be recorded.

The independent variable (manipulated variable) will be the WATCHING, while the dependent variable (tested/responding variable) will be the TIME IT TAKES FOR WATER TO BOIL

4. Analyse the data; the data refers to the recorded time for each group of water. This will be analysed and compared.

5. Make conclusion; the conclusion depends on the result, which is the recorded time for each group of boiled water. Based on the result, the hypothesis can either be rejected or accepted. For example, if the control group boils faster than the experimental group, our hypothesis will be accepted but if otherwise, the hypothesis will be rejected.

Therefore, via the scientific method, it can be determined if it really takes longer time for water to boil while watched.

Answer:

0.01981 gallons.

Explanation:

In this problem, we need to convert 75 mL of water to gallons.

We know that, 1 gallon = 3785.41 mL

To convert 75 mL to gallons, we must use to the unitary method such that,

1 mL = (1/3785.41) gallon

So,

[tex]75\ mL=75\times \dfrac{1}{3785.41}\\\\=0.01981\ \text{gallons}[/tex]

So, there are 0.01981 gallons in 75 mL of water.

Answer: As altitude increases, there is less air pushing down from above, which decreases the pressure.

Explanation:

Atmospheric pressure is the result of air particles being pulled to the surface of the Earth by gravity. As they are pulled, they will exert more pressure on the Earth and this is what atmospheric pressure is.

It makes sense therefore that as we move higher into the atmosphere, the atmospheric pressure will decrease because less air particles are exerting pressure as we go further off the ground.

Another way to look at it is that there is air in the earth's atmosphere and all that air has weight that is pushing down on us. As we go higher into the atmosphere, there'll be less air pushing down on us so the weight will be less.

Answer:

A as te altitude increases

Explanation:

Answer:

5. A. Shape and volume

6. A. Solid to liquid

7. C. Gas

Answer:

Because the enthalpy change of the reaction depends on the states of matter of the substances, they must be shown for each substance in the equation.

Explanation:

The enthalpy of a substance depends on the particular state of matter in which it occurs.

Therefore, in a thermo chemical equation, all the states of matters for all the chemical species in the equation must be accurately written so that the thermo chemical equation can be meaningful.

The correct statement about thermochemical equations is  the enthalpy

change of the reaction depends on the states of matter of the substances,

they must be shown for each substance in the equation.

Enthalpy is defined as the heat change that occurs in a reaction or the sum

of the internal energy present. It is associated with change in matter and  is

dependent on the physical states of the reactants and products.

This is the reason why the physical states such as solid, liquid, gas etc have

to be shown in a thermochemical equation.

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Answer:

Bond order of O22- = 1

Bond order of O22+ = 3

Explanation:

The bond order is given by;

1/2(number of bonding - number of anti bonding electrons).

In O22- , there are ten bonding and eight anti bonding electrons giving a bond order of 1 from; 1/2 (10 - 8) = 1

Similarly, for O22+ , we have ten bonding and four antibonding electrons, hence;

1/2 (10 - 4) = 3

Answer:

E

Explanation:

Here in this question, what we will do is to select which of the pairs that do not correlate.

A. Enthalpy and heat content

This two terms are at par with each other. By definition, the enthalpy of a system simply is the total amount of heat content it has.

B. Endothermic reaction and +H

These two terms are at par with each other. An endothermic reaction is one in which heat is absorbed from the surroundings. It has a positive value for the heat content i.e the enthalpy is positive and thus H is positive.

C. Exothermic reaction and -H

An exothermic reaction is one in which heat is released to the environment. It usually has a negative value for the enthalpy and thus the value of H is negative.

D. High energy and High Stability

These two terms are not at par. When an entity has or is of high energy, it is usually unstable. An entity at a higher energy level will not be stable until it goes to a lower level of energy.

Thus higher energy level is associated with lesser stability while lower energy levels are associated with higher stability. The lesser the energy of an entity, the higher its stability.

This makes the option our answer.

Answer:

A particular kind of matter

Explanation: