Separation by Distillation Are you completing this experiment online? Yes
Data Entry
Enter the volume of the solution in mL 3.35 Vapor temperature when distillation of cyclohexane started (°C) 80.51 Vapor temperature when distillation of cyclohexane finished (°C) 82.67 Volume of cyclohexane collected in mL 1.87 Vapor temperature when distillation of toluene started (°C) 111.47 Vapor temperature when distillation of toluene finished (°C) 112.54 Volume of toluene collected in mL 1.48
(5pts) Amount of cyclohexane collected in grams (5pts) Amount of toluene collected in grams (10pts) Post Lab Questions (10pts) What is the mass percentage of cyclohexane in the mixture?

To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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We need 120 grams of the 60% alloy and 80 grams of the 40% alloy to obtain 200 grams of an alloy containing 52% silver.

To solve this problem, we can use the following formula:

(amount of 60% alloy) + (amount of 40% alloy) = 200 grams

Let's represent the amount of 60% alloy as "x" and the amount of 40% alloy as "y". We can then set up two equations based on the amount of silver in each alloy:

0.6x + 0.4y = 0.52(200)   (since we want to end up with an alloy that is 52% silver)
x + y = 200

We now have two equations with two variables, which we can solve using substitution or elimination. Let's use substitution:

x + y = 200  --> y = 200 - x

0.6x + 0.4y = 0.52(200)
0.6x + 0.4(200 - x) = 104
0.6x + 80 - 0.4x = 104
0.2x = 24
x = 120

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Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Answer:

Galileo: "Father of Modern Science."

Aristotle: Geocentric theory." (The planests revolves around the earth.)

Torricelli: Invented the barometer. (An instrument which measures pressure.)

Copernicus: Heliocentric theory. (Aka, the planets revolves around the sun.)

Vesalius: Examined the inner workings of the human body

Newton: Developed law of universal gravitation.

Nightingale: Founded nursing profession.

Celsius: Developed metric temperature scale

I hope this helps! Thanks:)

Answer:

\(the \: nucleus \:\)

Explanation:

\(the \: nucleus \: is \: organelle \: that \: controls \\ \:a ll \: cellular \: activities.\)

Answer:

4.05/28=0.144g/ml

Explanation:

Answer:

160 g

Explanation:

5 x 32 = 160g, but if according to the periodic table u provided it would be 5 x 32.06

Answer:

160.3 g S

Explanation:

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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Answer:

A neutron in the nucleus converts to a proton and a beta particle. The nucleus ejects the beta particle and some gamma radiation. The new atom retains the same mass number, but the number of protons increases to 44.

Explanation:

mark me the Brainliest pls..

Explanation:

This is most likely a trick question as oxygen do not react with CO2.

Answer:

1100L.

Explanation:

d) the volume of 0.350 M NaOH required to neutralize the HCl produced when solvolysis of 1.00 mL of t-BuCl is 75% complete is 4.3 mL.

To calculate the quantities, we need to know the molar mass of t-BuCl, which is 92.57 g/mol.

(a) The number of moles of t-BuCl used can be calculated using the formula:

moles = volume (in liters) x concentration (in mol/L)

Given that the volume is 1.00 mL (which is equal to 0.001 L), and we have 2-chloro-2-methylpropane (t-BuCl), we can calculate the number of moles:

moles = 0.001 L x (2 mol/L) = 0.002 mol

Therefore, the number of moles of t-BuCl used is 0.002 mol.

(b) The complete solvolysis of 1.00 mL of t-BuCl produces 1 mole of HCl since t-BuCl undergoes a one-to-one reaction with HCl. Therefore, the number of moles of HCl produced is also 0.002 mol.

(c) To calculate the volume of 0.350 M NaOH required to neutralize the HCl, we can use the mole ratio between HCl and NaOH. The balanced equation for the neutralization reaction is:

HCl + NaOH -> NaCl + H₂O

The mole ratio between HCl and NaOH is 1:1. Therefore, the number of moles of NaOH required is also 0.002 mol.

We can use the formula:

volume (in liters) = moles / concentration (in mol/L)

volume = 0.002 mol / 0.350 mol/L = 0.0057 L

Converting this to milliliters:

volume = 0.0057 L x 1000 mL/L = 5.7 mL

Therefore, the volume of 0.350 M NaOH required to neutralize the HCl produced by complete solvolysis of 1.00 mL of t-BuCl is 5.7 mL.

(d) If solvolysis of 1.00 mL of t-BuCl is 75% complete, it means that only 75% of the t-BuCl has reacted to form HCl. Therefore, the amount of HCl produced would be 75% of 0.002 mol.

mol of HCl produced = 0.75 x 0.002 mol = 0.0015 mol

Using the same mole ratio of 1:1 between HCl and NaOH, we can calculate the volume of 0.350 M NaOH required:

volume = 0.0015 mol / 0.350 mol/L = 0.0043 L

Converting this to milliliters:

volume = 0.0043 L x 1000 mL/L = 4.3 mL

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The correct choice is A) −5Δ[Br−]/Δt. The rate expressed as Δ[Br2]/Δt is proportional to -5 times the rate of change of Br−.

In the given reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq), the stoichiometric coefficients provide information about the relationship between the reactants and products. To determine the rate expressed as Δ[Br2]/Δt, we need to compare it with the rate of change of the other species.

Based on the balanced equation, for every 5 moles of Br− consumed, 3 moles of Br2 are produced. Therefore, the rate of change of Br−, Δ[Br−]/Δt, is related to the rate of change of Br2, Δ[Br2]/Δt, by a factor of -5/3.

The other choices, B) −0.6Δ[Br−]/Δt, C) 3Δ[BrO3−]/Δt, and D) −Δ[H2O]/Δt, do not correspond to the correct relationship based on the stoichiometric coefficients of the reaction. Therefore, the correct answer is A) −5Δ[Br−]/Δt.

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Natural formation of lead occurs by radioactive decay of uranium and thorium through radon (222Rn). Four stable isotopes are known, 204Pb, 206Pb, 207Pb and 208Pb, the first three of which are used for estimating the ages of rocks. Lead compounds exist mainly in +2 or +4 oxidation states, the former being more common.

Answer: the molar mass will be too high

Explanation:

Answer:

I think its alike.... Pretty sure actually

According to the law of conservation of mass, it is considered a mistake to add calcium to the product side if it is not in the reactant side of a particular chemical equation because the masses of the products and reactants must be the same.

This is referred to as the symbolic representation of a chemical reaction in the form of symbols and formulae and depicts the compounds and states of matter involved.

According to the law of conservation of mass, the masses and elements of the products and reactants must be the same. Therefore, adding calcium to the product side is considered a mistake if it is not in the reactant side of a particular chemical equation because it is impossible to produce calcium from nowhere.

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The full question is:

According to the law of conservation of mass,why is it considered a mistake to add calcium to the product side if it is not in the reactant side of a particular chemical equation

The question requires us to choose the best option to explain why bubbles rise faster from a warm can of soda than a cold can, based on the solubility of gases in liquids.

Adding heat to a solution composed of a liquid and a gas (i.e., increasing its temperature) provides thermal energy to the gas that makes it possible to overcome the forces that maintain molecules of solvent (liquid) and solute (gas) together. In this way, the molecules of solvent and solute tend to separate, therefore decreasing the solubility of the gas. Based on this, we can say that the solubility of gases in liquids increase with increasing temperature.

Therefore, the best option to answer the question is the first one, "gases become less soluble in liquids at higher temperatures".

The Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction; it can only be changed from one form to another.

This means that the total mass of substances before the reaction is the same as the total mass of substances after the reaction. Balancing a chemical equation ensures that the Law of Conservation of Mass is observed. It ensures that the same amount of each element that was present before the reaction is also present after the reaction.
Coefficients are used to balance chemical equations. They are placed in front of the reactants and products in a reaction to ensure that the number of atoms of each element on the left side of the equation is equal to the number of atoms of each element on the right side.
In a physical or chemical change, the mass of the reactants is equal to the mass of the products. This is because mass is conserved according to the Law of Conservation of Mass, and so no matter what form a substance takes, the same amount of mass will remain.

However , In a chemical change, the mass of the reactants is equal to the mass of the products obtained from the reaction. Thus, mass is always conserved during a physical or chemical change.

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The amount of sugar in 100 ml of the solution is 10 g.

To calculate the concentration of the sugar solution in g/100 ml, we need to determine the amount of sugar present per 100 ml of the solution.

Given:

Mass of sugar = 5 g

Volume of water = 50 ml

First, we convert the volume of water to 100 ml:

(100 ml / 50 ml) * 5 g = 10 g

Therefore, the amount of sugar in 100 ml of the solution is 10 g.

Hence, the concentration of the sugar solution is 10 g/100 ml or simply 10 g/100 ml, which means there are 10 grams of sugar in every 100 ml of the solution.

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Best describes a mole is it contains 6.02×10²³ particles of a given substance

Mole is the amount of substance that contain the same number of elementary entities and according to the Avogadro's law number of elementary entities in the substance is 6.02×10²³ and these elementary entities could be atoms, ions, molecules etc and we use the mole to express the amount of substances and one mole of any substance is the equal to its atomic mass and molecular mass which is expressed in gram and the number of particles present in one mole of any substance is 6.02×10²³

Therefore the statement which is correct for mole is  it contains 6.02×10²³ particles of a given substance

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Answer:

Jelani Jones

Explanation:

But I thought it was 2 not three

The complete question is as follows: I want to make a homemade cake recipe you need 100 grams of sugar, calculate the moles to which it is equivalent and the number of molecules of sucrose.

Answer: In 100 grams of sugar there are 0.292 moles and the number of molecules of sucrose are \(1.76 \times 10^{23}\).

Explanation:

Given: Mass = 100 g

Molar mass of sugar = 342.3 g/mol

As number of moles is the mass of substance divided by its molar mass.

Hence, moles of sucrose are calculated as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{100 g}{342.3 g/mol}\\= 0.292 mol\)

According to mole concept, 1 mole of every substance contains \(6.022 \times 10^{23}\) molecules.

Hence, the number of molecules present in 0.292 mol are calculated as follows.

\(0.292 mol \times 6.022 \times 10^{23}\\= 1.76 \times 10^{23}\)

Thus, we can conclude that in 100 grams of sugar there are 0.292 moles and the number of molecules of sucrose are \(1.76 \times 10^{23}\).

we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

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Heat transfers from object A to object B, because molecules from A collide with those from B. Option 1.

Heat always flows from an object at a higher temperature to an object at a lower temperature. When two objects at different temperatures are in contact with each other, their molecules collide, and this collision transfers energy from the hotter object to the colder object.

As a result, the hotter object loses heat, and the colder object gains heat. This process will continue until the two objects reach thermal equilibrium, meaning that they have the same temperature and there is no more net heat transfer between them.

Therefore, in the given scenario, object A, which is hotter, will transfer heat to object B, which is colder, as the molecules from object A collide with those from object B.

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Answer:

Heat transfers from object A to object B, because molecules from A collide with those from B.

Explanation:

The Kelvin scale temperature. As a result, at 411 K, the reaction's entropy change equals the surroundings' entropy change.

Temperature has an indicator of the mean kinetic energy in the system's atoms or molecules. Water particles in a cup in hot coffee contain a higher average velocity than water molecules in to cup of chilled tea, which means they move faster.

The Celsius or Kelvin scales are employed. Temperatures are measured in laboratories using Celsius thermometers. The previously Celsius measurements are changed to Kelvin for some calculations. That kelvin is the SI unit about temperature.

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4) The temperature went up by 3 degrees

5) The reaction is exothermic

6) The burning of hydrocarbons is an exothermic reaction

One of the characteristics of a chemical change is that there could be a change in the temperature of the system. The temperature of the system could be found to have been increased or decreased as the case may be.

In any case, the change in the temperature of the system is what is going to tell is whether the reaction was exothermic or endothermic. If the reaction is endothermic, there is going to be a drop in temperature but if the reaction is exothermic, there is going to be an increase in temperature.

Now we can see from the table that the temperature is increasing by a factor of about three degrees so we can say that the reaction is exothermic.

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The following things could happen : Activation of DNA damage response, DNA repair, Activation of cell cycle checkpoints and Accumulation of mutations

Activation of DNA damage response: The cell has mechanisms to detect DNA damage and activate a DNA damage response (DDR). Proteins such as ATM and ATR sense the damage and initiate signaling cascades. This response can halt the cell cycle progression to allow time for DNA repair.

DNA repair: The cell may initiate DNA repair processes to fix the damage. Depending on the type and extent of the damage, the cell can employ different repair mechanisms such as base excision repair, nucleotide excision repair, or homologous recombination. If the damage is repairable, the cell will pause in the G2 phase to allow the repair processes to occur.

Activation of cell cycle checkpoints: If the DNA damage is severe and cannot be repaired, the cell cycle checkpoints may be triggered to prevent cell division. The G2/M checkpoint ensures that damaged DNA is not passed on to daughter cells.

Accumulation of mutations: If the cell fails to repair the DNA damage and bypasses the checkpoints, it can lead to the propagation of mutations. These mutations can be deleterious and contribute to genetic instability, potentially leading to the development of cancer or other diseases.

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The correct statement about the element oxygen (O) based on the Periodic Table is: It has 6 protons and 8 neutrons. So, option (C) none of these choices are correct is the answer.

The element oxygen has an atomic number of 8, which indicates that it has 8 protons in its nucleus. The number of protons determines the element's identity. Additionally, the atomic mass of oxygen is approximately 16, and since the atomic mass is the sum of protons and neutrons, subtracting the number of protons (8) from the atomic mass (16) gives us the number of neutrons, which is 8.

Regarding the electron configuration, oxygen has 2 electrons in the innermost shell and 6 electrons in the second shell, making a total of 8 electrons. The outermost shell, also known as the valence shell, contains 6 electrons. This electron configuration enables oxygen to readily form bonds with other elements.

Therefore, the statement "It has 6 protons and 8 neutrons" is correct for the element oxygen (O) based on the information from the Periodic Table.

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