A log is burned in a fireplace until only ashes remain. The mass of the ashes in the fireplace is less than the mass of the log. Explain this in ralation to the conservation of matter ​

The percent yield of the product = 64.88 %

one mole of acetophenone  equals to one mole of benzoic acid

therefore ,

number of  mole of acetophenone = number of mole of benzoic acid

number of moles of acetophenone = mass / molar mass

                                                           = 1.03 × 87 × 10⁻⁶ moles

                                                           = 89.61 × 10⁻⁶ moles

now tactual yield :

number of moles of benzoic acid  = mass / molar mass

                                                        = 0.071 / 122.12

                                                        = 58.14 × 10⁻⁶ moles

the percent yield = (actual yield / theoretical yield ) × 100 %          

                            =    (58.14 × 10⁻⁶ / 89.61 × 10⁻⁶)  × 100 %        

                            = 64.88 %

Thus, The percent yield of the product = 64.88 %

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It is critical to ensure that the power supply is suitable and reliable in order for the light to switch on and stay on as planned. This may be accomplished by employing a good electrical wiring system, connecting the light to a stable and dependable source of power.

As per the question given,  

The electrical system is regularly maintained and updated to avoid difficulties such as voltage dips or electrical shorts.

The source of electricity is very important in ensuring that the light turns on because without a proper source of electricity, the light will not receive the required electrical energy to produce light.

Different sources of electricity may have different characteristics, such as voltage, frequency, and current capacity. For example, a light bulb that is designed to operate at a certain voltage may not work properly if it is connected to a source that provides a different voltage. Similarly, if the frequency of the electricity is not within the acceptable range for the light, it may not turn on or may flicker.

Moreover, the source of electricity needs to be reliable and stable to ensure that the light turns on consistently and stays on for the desired duration. If the electricity supply is intermittent or unstable, the light may turn on and off or not turn on at all.

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Chemical changes involve a rearrangement of atoms, resulting in new substances with different properties, while physical changes only alter the state or appearance of a substance without changing its composition. By examining the composition and properties of substances before and after a change, we can distinguish between chemical and physical changes.

One reliable way to distinguish a chemical change from a physical change is by examining the composition of the substances involved before and after the change. Chemical changes involve a rearrangement of atoms and result in the formation of new substances with different chemical properties, while physical changes involve a change in the state or appearance of a substance without altering its chemical composition.

During a chemical change, the bonds between atoms are broken and new bonds are formed, leading to the creation of different molecules or compounds. This alteration in chemical composition often results in significant changes in properties such as odor, taste, reactivity, and toxicity. For example, when iron rusts, it undergoes a chemical change as it reacts with oxygen in the air to form iron oxide, resulting in a distinct reddish-brown color and different chemical properties compared to pure iron.

In contrast, physical changes do not involve a change in the fundamental chemical composition of substances. Instead, physical changes typically involve alterations in the physical state, such as changes in temperature, pressure, or phase. These changes can be reversed without forming new substances. For instance, melting ice into water or freezing water into ice are physical changes because the molecular composition of H₂O remains the same.

By carefully observing and analyzing the properties and composition of substances before and after a change, it is possible to distinguish between chemical and physical changes. This understanding is crucial in various fields, including chemistry, materials science, and biology, to identify and characterize different types of transformations.

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The key intermediate containing a chiral center of the alanine racemase catalyzed reaction can be represented as a structure containing the alpha-carbon of the alanine bound to the PLP moiety.

The conversion of L-alanine to D-alanine catalyzed by alanine racemase is an essential biological process as D-alanine is an important constituent of bacterial cell walls. Alanine racemase catalyzes the interconversion of the two stereoisomers of alanine and is also known to be a member of the pyridoxal phosphate (PLP) dependent enzyme family. In the process of catalyzing the reaction, the enzyme uses the coenzyme pyridoxal phosphate (PLP), which acts as an electrophile and an electron sink. PLP acts as an electrophile by forming a Schiff base with the alpha-amino group of L-alanine, which is followed by proton abstraction from the alpha-carbon to generate a carbanion that is stabilized by PLP. The carbanion intermediate is then report at the opposite face to give D-alanine.

Therefore, PLP is a crucial co-factor that is required for the function of alanine racemase, as it provides the key intermediate containing a chiral center that is essential for the conversion of L-alanine to D-alanine. The key intermediate can be represented as a structure containing the alpha-carbon of the alanine bound to the PLP moiety, which plays an important role in stabilizing the carbanion intermediate formed during the reaction.

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Answer:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

Explanation:

Write the reaction of HF (a weak acid) with water:
\(\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}\)

Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.

The equilibrium constant expression for this equation will hence be:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

Note that pure solids and liquids are not included in the equilibrium expression.

In conclusion:

\(\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}\)

The new pressure on the Tank is 31.3 atm.

To find the new pressure, we can use the formula derived from the Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its temperature when the volume remains constant. The formula is:

P1/T1 = P2/T2

where P1 is the initial pressure, T1 is the initial temperature in Kelvin, P2 is the final pressure, and T2 is the final temperature in Kelvin. First, convert the temperatures from Celsius to Kelvin:

T1 = 22.0°C + 273.15 = 295.15 K
T2 = 35.0°C + 273.15 = 308.15 K

Now, plug in the given values and solve for P2:

(30.0 atm) / (295.15 K) = P2 / (308.15 K)

P2 = (30.0 atm) × (308.15 K) / (295.15 K) ≈ 31.3 atm

The new pressure after heating is approximately 31.3 atm.

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A process in which a large nucleus splits into two or more parts is called nuclear fission. That is option B

A nuclear fission is the process by which the unstable nucleus of heavy atoms splits into two or more smaller nuclei which are usually called the fission products.

Example of elements that can undergo nuclear fission reaction include the following:

Nuclear fusion is the combination of two or more lighter nuclei to form a single heavy nucleus with the release of energy. This is the direct opposite of a nuclear fission reaction.

Therefore, a process in which a large nucleus splits into two or more parts is called nuclear fission.

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Magnesium has 3 stable isotopes: majority Mg-24 with 78'6%, Mg-25 with 10'1%, and Mg-26 with 11'3%.  24.31 u​ will be its atomic mass.

A chemical element's isotope is one of more than one species of atoms that share the same atomic number, spot on the periodic table, and almost identical chemical activity, but differ in atomic mass and physical characteristics. There are a number of isotopes for each chemical element. The first step in identifying and labelling an atom is to count the protons within its nucleus.

Average atomic mass = (M1P1 + M2P2 + M3P3 +….) / 100​

                     ​= (23.98504 x 78.70 + 24.98584 x 10.13 +25.95259 x 11.17)/100 ​                       = 24.31 u​

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Answer:

The correct answer is - option 1. the solution is acidic.

Explanation:

The pH is a scale to measure or check the acidity or basicity of an aqueous solution. The lower values on the pH scale indicate the acidity of the solution as on the pH bar 0 indicating the highest acidic value and the higher value indicates the alkaline or basic value of the solution and 14 indicating the highest alkaline. The pH of water is 7 which is a neutral condition.

Therefore, the pH of a solution with 5.5 on pH solution represents the acidic property of the solution, however, it is slightly acidic as it is near the neutral value.

Answer:

The solution is acidic

Explanation:

The lower the number, the more acidic the solution is

The resulting value will be in joules (J), representing the amount of heat released during the dissolution of KNO3 in water.To calculate the heat released by the solution, we can use the equation Q = mcΔT, where Q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature.

First, we need to calculate the mass of the solution. This can be done by adding the mass of water (275 g) to the mass of KNO3 (26.7 g), giving us a total mass of 301.7 g.

Next, we calculate the change in temperature by subtracting the final temperature (17.70 °C) from the initial temperature (23.00 °C), which gives us ΔT = -5.30 °C (note that the negative sign indicates a decrease in temperature).

Since the specific heat capacity of the resulting solution is assumed to be the same as water (4.184 J/(g·°C)), we can substitute the values into the equation Q = mcΔT. The mass (m) is 301.7 g, the specific heat capacity (c) is 4.184 J/(g·°C), and ΔT is -5.30 °C.

By plugging in these values, we can calculate the heat released by the solution. The resulting value will be in joules (J), representing the amount of heat released during the dissolution of KNO3 in water.

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Answer:

4 yards/second is the answer

Answer:

the answer is 4 yards per second

Explanation:

80 yards in 20 seconds

20+20+20+20=80

there are 4, 20s to make 80

in other words...

80÷4=20

Therefore, the approximate pH at the half-equivalence point is 4.00.

The correct answer is b) 4.00.

Chemistry uses a quantitative scale known as pH to categorize substances as acidic, basic, or neutral. Acidic substances are those that have a pH value lower than 7. For instance, acidic foods like vinegar, tamarind, lemon, etc. More than 7 means that the substance is fundamental in nature.

The half-equivalence point of a weak acid-strong base titration occurs when half of the weak acid has been neutralized by the strong base. At this point, we have an equal concentration of the weak acid and its conjugate base.

Since the Ka value is known for the weak acid, we can use the Henderson-Hasselbalch equation to calculate the approximate pH at the half-equivalence point:

pH = pKa + log ([A-]/[HA])

At the half-equivalence point, [A-] = [HA], so the logarithm term becomes log(1) = 0. Therefore, the pH at the half-equivalence point is approximately equal to the pKa of the weak acid.

Given that the Ka value is 1.0 × 10⁽⁻⁴⁾, the pKa is equal to -log(1.0 × 10⁽⁻⁴⁾) = 4.

Therefore, the approximate pH at the half-equivalence point is 4.00.

The correct answer is b) 4.00.

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Answer:

No they are not identical.

Explanation:

They are not identical because there are many ranges of states that the electrons could have.

I hope it helps! Have a great day!

Muffin ^^

Answer:

No.

Explanation:

It could vary so it wouldn’t be identical.

I hope it helps! Have a great day!

bren~

The molar solubility of the salt is approximately 2 x 10^(-10) mol/g.

To determine the molar solubility of the salt, we need to calculate the number of moles of the salt that have dissolved in the saturated solution.

Given:

Ionic concentration of the salt = 5.3 x 10^(-5) M

Molecular weight of the salt = 265.2 g/mol

The molar solubility (S) is defined as the number of moles of solute dissolved in one liter of solution. We can calculate it using the following equation:

S = ionic concentration / 1000

Converting the ionic concentration to moles per liter:

S = (5.3 x 10^(-5) M) / 1000

S = 5.3 x 10^(-8) mol/L

Since the molar solubility is given per liter, we don't need to convert it further.

To find the molar solubility in terms of the number of moles per gram of the salt, we can use the molecular weight of the salt:

Molar solubility (mol/g) = S / molecular weight

Substituting the values:

Molar solubility (mol/g) = (5.3 x 10^(-8) mol/L) / 265.2 g/mol

Molar solubility (mol/g) ≈ 2 x 10^(-10) mol/g

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Answer:

d. The acid is likely to eat through the can.

Explanation:

Aluminium is a metallic element found in group 3 of the periodic table. Aluminum is a very reactive metal owing to the fact that it reacts with almost every substance it comes in contact with e.g air, acids, bases etc.

In this question where Derek stores his Hydrochloric acid (HCl) remnant, after an experiment, into a can made of aluminum. What will happen is that the acid is likely going to eat through the can. This might occur gradually but will eventually. Aluminum protects itself from further reactions by forming a layer of Aluminum oxide (Al2O3) when it reacts with air.

This is what keeps the reaction with HCl gradual but the acid will eventually permeate the layer and corrode the aluminum can by reacting with the aluminum.

Answer:

they ate lelo pudina hahahha

11.87 g of CO(g) is required to completely react with 22.55 g Fe₂O₃(s) to produce 15.32 g Fe(s). The percent yield of the reaction is 97.15%.

The balanced equation for the reaction between CO(g) and Fe₂O₃(s) is:

Fe₂O₃(s) + 3 CO(g) -> 2 Fe(s) + 3 CO₂( g)

To determine how much CO is required to completely react with 22.55 g of Fe2O3, we need to use the stoichiometry of the reaction.

From the balanced equation, we know that for every 1 mole of Fe₂O₃(s) that reacts, 3 moles of CO(g) are consumed. To convert mass to moles, we use the molar mass of Fe₂O₃(s), which is 159.69 g/mol.

22.55 g Fe2O3 / 159.69 g/mol = 0.1412 moles of Fe2O3

From the balanced equation we know that for every 1 mole of Fe₂O₃(s), 3 moles of CO(g) is required, so we can calculate the moles of CO(g) needed for the reaction:

0.1412 moles Fe₂O₃(s) (3 moles of CO(g) / 1 mole of Fe₂O₃(s)) = 0.4236 moles of CO(g)

To get the mass of CO(g), we can convert the moles to grams using the molar mass of CO(g), which is 28.01 g/mol.

0.4236 moles of CO(g)(28.01 g/mol) = 11.8660 = 11.87 g of CO(g)

To find the % yield, we divide the actual yield (15.32 g Fe(s)) by the theoretical yield (mass of Fe(s) produced from all the Fe₂O₃(s) consumed) and multiply by 100.

Theoretical yield of Fe(s) = mass of Fe₂O₃(s)  consumed(mass of Fe(s) produced from 1 mol Fe₂O₃(s)  / mol of Fe₂O₃(s)  consumed)

= 22.55 g Fe₂O₃(s) (55.85 g Fe(s) / mol Fe(s)) (2 mol Fe(s) / 1 mol Fe₂O₃(s)) (1 mol Fe₂O₃(s) / 159.69 g Fe₂O₃(s)) = 15.77 g Fe(s)

% yield = (15.32 g Fe(s) / 15.77 g Fe(s)) x 100 = 97.15%

So, 11.87 g of CO(g) is required to completely react with 22.55 g Fe₂O₃(s) to produce 15.32 g Fe(s) and the % yield of the reaction is 97.15%.

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Answer:

molerat

Explanation:

Answer:

3.28 mol

Explanation:

2 mol FeCl3 forms from 2mol of FeCl2

therefore 3.28 mol of FeCl3 forms from=2/2×3.28 mol=3.28 mol

Heat is related to energy as it is referred to a form of energy which is denoted as option A.

This is also known as thermal energy and it is referred to as the ability to do work and there are different types which include the following below:

It is also referred to as the form of the energy which is transferred from one body or surface to another as a result of the differences in temperature so as to reach an equilibrium.

Heat energy has various functions such as heating water and electricity generation. It is also lost when energy is transferred from one trophic level to another which is the reason why the energy efficiency is not 100 percent  which is therefore the reason why option A was chosen.

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Answer:

The distance covered by the body per unit time is called speed.

A distance travelled by the body per unit time in a fixed direction is called velocity

I hope this help u:)

Answer:

Force is an external agency that changes or tends to change the state of a body from rest to motion or from motion to rest is called force

Explanation:

The distance covered by a body in a unit time is called speed

Answer:

D

Explanation:

Answer:

C) gold - zinc - magnesium - lithium

Carbon dioxide would be absorbed by the water, lowering air pressure, resulting in evaporation or freezing of the water.

The early atmosphere of Mars and its early, universal magnetic field both had a direct and indirect impact on the presence of liquid water on the planet. The atmosphere of Mars was much thicker than it is now about 4 billion years ago. And there was a lot more carbon dioxide in there (and other gases). A greenhouse gas called carbon dioxide contributes to the planet's warming. According to two researchers from Caltech's Jet Propulsion Laboratory, a sizable store of carbon dioxide trapped in the soil of Mars may be responsible for the apparent abrupt shifts in the red planet's temperature over billions of years.

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Answer:

The sun

Explanation:

Because plants use sunlight to conduct photosynthesis which is the process the need to create energy

The rate of production of P₄ in the experiment is 0.014 M/s

The rate of a reaction is the rate at which reactants molecules are used up or the rate at which product molecules are formed.

The rate of a reaction is given mathematically as follows:

The average rate of production of P₄ in given by the change in concentration, Δ[P₄], divided by the corresponding change in time, Δt.

Rate of production of P₄ = (0.8 M - 0.3 M) / (54 - 19)

Rate of production of P₄ = 0.014 M/s

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Answer:

inphysics electromagnetic radiation refers to the waves of the electromagnetic field propagating through space carrying electromagnetic radiant energy it includes radio waves microwaves infrared light ultraviolet X-rays and gamma rays

The average kinetic energy (avg ke) of an ideal gas varies inversely with the molar mass of the gas.

The formula for average kinetic energy is KE=3/2 kT, where k is the Boltzmann constant and T is the temperature in Kelvin.

According to this formula, the average kinetic energy of gas molecules is proportional to temperature.

The ideal gas law is a combination of Boyle's Law, Charles' Law, and Avogadro's Law, which are the three laws governing the behavior of ideal gases.

The ideal gas law can be expressed as PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.



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Answer:

each element gains one proton as you move from left to right across a period, atomic number is the number of protons

careful not to confuse it with the mass number which is the number of protons and neutrons.

also remember that in any given element, the proton number is always equal to electron number as they have opposite charges that cancel off, this is why elements are neutral.

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The cross-section that best represents the fronts and air movements in the lower atmosphere along line xy is C.

Air fronts are boundaries between two air masses of different temperatures, humidity, and pressure.

There are four types of air fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts.

A cold front occurs when a cold air mass moves into an area occupied by a warmer air mass.

A warm front occurs when a warm air mass moves into an area occupied by a colder air mass.

A stationary front occurs when neither air mass is advancing

An occluded front occurs when a cold front overtakes a warm front.

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