tolerability of photodynamic therapy using 10% 5-aminolevulinic acid hydrochloride gel for treating actinic keratoses on surface areas larger than 75cm2

Atoms of particles are so small that they cannot be divided further by any physical means.

According to John Dalton, atoms are the smallest, indivisible particles of elements.

However, it was later found out that chemically, atoms consist of protons, neutrons, and electrons.

Thus, the indivisibility of atoms that John Dalton was referring to must be that of physical division.

In other words, the particles of atoms are so small that dividing them further using physical means is absolutely impossible.

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Answer:

police officer

Explanation:

the officer who responds first to the scene has the responsibility to protect the public and the crime scene.

The heat transfer rate to the cold water is 167.51 kW, and the logarithmic mean temperature difference for this heat exchanger is 28°C.

We know that, Q = m × Cp × ΔT

Where

m = mass flow rate

Cp = specific heat capacity

ΔT = Temperature difference

Q = (1.5 kg/s) × 4.25 kJ/kg °C × (80 - 45)°CQ = 172.69 kW

As per the problem, 3% of the heat given off by the hot fluid is lost through the heat exchanger.

Thus, heat loss is 0.03 × 172.69 kW = 5.18 kW

The heat transfer rate to the cold water is given as Q1 = Q - heat loss = 172.69 kW - 5.18 kW= 167.51 kW

To find the logarithmic mean temperature difference for this heat exchanger:

The formula for LMTD is,∆Tlm = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

where

ΔT1 = hot side temperature difference = Th1 - Tc2

ΔT2 = cold side temperature difference = Th2 - Tc1

Tc1 = inlet temperature of cold water = 20°C

Tc2 = outlet temperature of cold water = ?

Th1 = inlet temperature of hot water = 80°C

Th2 = outlet temperature of hot water = 45°C

∆T1 = Th1 - Tc2 = 80°C - Tc2

∆T2 = Th2 - Tc1 = 45°C - 20°C = 25°C

Thus,∆Tlm = (80°C - Tc2 - 45°C) / ln[(80°C - Tc2) / (45°C - 20°C)]

∆Tlm = (35°C - Tc2) / ln(2.67[(80 - Tc2) / 25])

Now, the heat exchanger is a double pipe parallel flow heat exchanger. Thus, both hot and cold fluids have the same value of LMTD.∆Tlm = 35°C - Tc2 / ln(2.67[(80 - Tc2) / 25]) = 35°C - (47.81/ln(2.67[42.79/25]))

∆Tlm = 27.81°C which is approximately equal to 28°C

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The freezing point of the solution will be - 0.952 °C can be calculated by the molality of the solution.

Molality of the solution can be calculated as follows by :

Molality= Number of the moles of the solute / weight of the solvent in Kg

= 27.3 ×100/ 83.0 × 46.07

= 0.7m

Since the molar mass of the ethanol is 46.07g/mol

So by the formula,

The molal freezing point depression constant KF and the solute's molality, m, are used to calculate the freezing point depression, which is given by T = KFm. Rearranging results in the formula: mol solute = (m) x (kg solvent).

ΔTf​ = Kf  ×Molality

=1.86×0.7

= 0.952

Thus, freezing point = 0−0.952

                                 =−0.952

Hence the freezing point of the resulting solution is calculated .

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Answer:

89.1 N

Explanation:

W = m gm = 55.0 x 1.62 = 89.1 N

Answer: B) Sperm

Explanation:  For lazy gang wya Lol

Answer: D. negative

Explanation:

The volume of the fruit drink comes out to be 0.712 L which is calculated in the below section.

Using the dilution law,

M1 V1 = M2 V2......(1)

Here, M represents the molarity and V represents the volume.

The given parameters are as follows-

M1 = 0.2 M

V1 = 2.5 L

M2  = 0.7 M

To calculate the volume of the fruit drink after dilution, substitute the known values in equation (1) as follows-

0.2 M x 2.5 L = 0.7 M x V2

V2 = (0.2 M x 2.5 L) / 0.7 M

    = 0.5 / 0.7 L

     = 0.7142 L

The volume comes out to be 0.712 L.

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Answer: Chloride and Chromate ions

Explanation:

Two anions used in this lab to perform selective precipitation of the unknowns are chloride and chromate ions.

Anions such as  Cl− ,  Br− ,  SO2−4 ,  CO2−3 ,  S2− ,  Cr2O2−4 ,  PO2−4 ,  OH−  etc., forms a mixture of metal ions in a solution which can be separated by precipitation. If a metal ion or a group of metal ions forms insoluble salts with a particular anion, then they can be separated from others by the precipitation.

Anions can also be separated by the precipitation with appropriate metal ions. There are no separation lines between insoluble salts, sparingly soluble, and soluble salts, but their concentrations of saturated solutions are small, medium, and large. For insoluble and sparingly soluble salts, solubility products are usually listed. But for soluble salts they are not given.

Solubility products for soluble salts are very large.

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Answer:8

842.46 or to the next whole number

Explanation:

just multiply the mass of iron with the volume mL you have.

The mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

The product of density and volume of a substance represents its mass. Mathematically -

M = V x ρ

where -

ρ - density

M - mass

V - volume

Given is iron in liquid form. It occupies a total volume of 111 ml.

The mass of liquid iron can be calculated using -

M = V x ρ

Volume of iron [V] = 111 ml = 111 cm³.

Density of iron [ρ] = 7.847 g/cm³

Therefore, we can write -

M = 7.847 x 111

M = 871.01 grams

Therefore, the mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

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Answer: please make the question more understandable

Explanation:

Answer:

The patented TRUE-TECH Self-Heating Technology is a simple combination of food grade iron and magnesium powder, salt, and water. When the contents of the water pouch are poured over the heater pad, the Food Heater releases enough heat to warm-up a pre-cooked meal 100 degrees Fahrenheit in approximately 10 minutes.

Explanation:

Answer: It is a molecular compound. (2) It contains a metal. (3) It can conduct electricity as a solid.

Answer:

A

Explanation:

I hope this is correct and have a great day

The approximate bond angles around each carbon atom in a molecule depend on its molecular geometry.

For example, in a tetrahedral geometry, the bond angles are approximately 109.5 degrees. In a trigonal planar geometry, the bond angles are approximately 120 degrees. In a linear geometry, the bond angles are approximately 180 degrees. These angles arise due to the repulsion between electron pairs in the valence shell of the carbon atom, which results in a geometric arrangement that maximizes the distance between these electron pairs. These bond angles provide important information about the shape and stability of the molecule and influence its reactivity and properties.

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3 moles of NaOH reacts with 1 mole of phosphoric acid.

The moles ratio of the reaction between NaOH and Phosphoric acid is given by the equation of the reaction below:

\(3\:NaOH + H_{3}PO_{4} \rightarrow Na_{3}PO_{4} + 3\:H_{2}O \\ \)

Based on the equation of the reaction, 3 moles of NaOH reacts with 1 mole of phosphoric acid.

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Answer:

11 electrons

Explanation:

The atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).

Explanation:

there was any anything to help with

did you attach the picture

Stirring the solution vigorously, grinding the solute down into tiny particles, and gently heating the solution are expected to speed up a dissolution process.

Based on your question, the factors that can speed up the dissolution process are:

1. Stirring the solution vigorously
2. Grinding the solute down into tiny particles
3. Gently heating the solution

These actions increase the contact between solute and solvent, promote kinetic energy, and enhance the overall dissolution process. Sweeping the solute particles into a pile within the solvent would not be effective, as it would not increase the surface area or interaction between solute and solvent.

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The frequency of the infrared wave at the given speed and wavelength is \(5.5 \times 10^{13} \ Hz\).

The given parameters;

The frequency of the infrared wave is calculated by using wave equation as shown below;

v = fλ

where;

\(f = \frac{v}{\lambda} \\\\f = \frac{3\times 10^8}{5.5 \times 10^{-6}} \\\\f = 5.5 \times 10^{13} \ Hz\)

Thus, the frequency of the infrared wave at the given speed and wavelength is \(5.5 \times 10^{13} \ Hz\).

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The curve's horizontal lines or plateaus can be used to determine the substance's melting and boiling points .

The heat required to raise a substance's temperature (without changing its phase) is provided by the equation: q = m c T (see previous chapter on thermochemistry). The equation q = n H states how much heat is required to cause a specific phase transition.

By drawing two straight lines across the data points above and below the solution's freezing point, the freezing point may be calculated from the graph. The freezing point of the solution is the temperature that results from the junction of the two lines.

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By summing up the number of protons and neutrons in an element's atoms, one may get the Ar (atomic mass) of that particular element.

The number of protons and neutrons in an atom's nucleus is added to determine the atomic mass of an element. The mass number is a frequent name for this figure. The weighted average of the masses of all the naturally occurring isotopes of an element is used to determine its atomic mass. Each isotope's proportional abundance in nature is taken into consideration while calculating its weight. The periodic table, which provides the atomic number, symbol, name, and atomic mass for each element, may be used to determine an element's atomic mass, which is often represented in atomic mass units (amu).

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The competing substitution product that could possibly form in the synthesis reaction of cyclohexanol to cyclohexene is cyclohexyl methyl ether (CH3OCH2C6H11).

The mechanism for its formation involves the protonation of cyclohexanol to form the oxonium ion, followed by a nucleophilic attack of methanol (CH3OH) on the oxonium ion to form cyclohexyl methyl ether and water as a byproduct.
However, this competing substitution product is the minor product because the dehydration reaction that forms cyclohexene is thermodynamically favored due to the formation of a more stable pi bond in the product. The mechanism for the dehydration reaction involves the deprotonation of cyclohexanol to form a cyclohexoxide intermediate, which then undergoes an E1 elimination to form cyclohexene and water as a byproduct.
Overall, although the formation of cyclohexyl methyl ether is possible in the synthesis reaction of cyclohexanol to cyclohexene, it is the minor product due to the thermodynamic favorability of the dehydration reaction that forms cyclohexene.

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Answer:

Explanation:

The pressure at a depth of 5000 meters in the ocean is approximately 50,225,000 Pascal (Pa), which is equivalent to 502.25 atmospheres (atm) or 4946.89 meters of water column (mwc).

The pressure at a depth of 5000 meters in the ocean can be calculated using the hydrostatic pressure formula, which states that the pressure increases with depth due to the weight of the overlying water. The formula is:

Pressure = Density × Gravity × Depth

The density of seawater can vary, but we can use an approximate value of 1025 kg/m³. The acceleration due to gravity is approximately 9.8 m/s².

Using these values, we can calculate the pressure at a depth of 5000 meters:

Pressure = 1025 kg/m³ × 9.8 m/s² × 5000 m

Pressure ≈ 50,225,000 Pa

Therefore, the pressure at a depth of 5000 meters in the ocean is approximately 50,225,000 Pascal (Pa), which is equivalent to 502.25 atmospheres (atm) or 4946.89 meters of water column (mwc).

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Answer:

I believe its A. Mass

Explanation:

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.

Answer:

B. Magnetism

Explanation:

Hope this helps! :))
Sorry for late answer

Climate is the name for the long-term temperature, wind, clouds, and precipitation patterns in an area, hence option C is correct.

Climate is the area's long-term weather pattern, whereas weather defines the area's short-term meteorological conditions. Climate specifically refers to the yearly averages for temperature, precipitation, wind, and clouds.

The long-term pattern of the weather in a place is called the climate. Hour by hour, day by day, month by month, or even year by year, the weather might vary. The climates in different places of the world vary.

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Answer:

22.9atm

Explanation:

Partial pressures should add to the total pressure. Knowing that we can use the ideal gas law PV=nRT where

P = pressure

V = volume

n = moles of gas

R = gas constant (0.08206 \(\frac{(L)(atm) }{(mol)(K)}\))

T = temp in Kelvin (Celcius + 273)

rearranging this formula for pressure we get

P = (nRT)/V

P = ((5.25+4.10)x0.08206x298)/(10.00)

P = 22.9atm

Answer:

5m/s

Explanation:

3600m ÷ 720s

= 5m/s

The final result is approximately 12.53%, indicating that KNO3 constitutes about 12.53% of the total mass of the solution.

Given:

Mass of K3PO4 = 43 g

Mass of water = 900 g

To calculate the percent by mass of KNO3 in the solution, we need to determine the mass of KNO3 and then divide it by the total mass of the solution, and finally multiply by 100.

First, let's calculate the mass of KNO3:

Molar mass of KNO3 = (39.10 g/mol for K) + (14.01 g/mol for N) + (16.00 g/mol for O) × 3

= 101.10 g/mol

To find the mass of KNO3, we need to convert the mass of K3PO4 to moles and then use the stoichiometric ratio between K3PO4 and KNO3.

Number of moles of K3PO4 = Mass of K3PO4 / Molar mass of K3PO4

= 43 g / 101.10 g/mol

≈ 0.425 moles

Since the stoichiometric ratio between K3PO4 and KNO3 is 1:3 (3 moles of KNO3 are equivalent to 1 mole of K3PO4), the number of moles of KNO3 is three times the number of moles of K3PO4:

Number of moles of KNO3 = 3 × Number of moles of K3PO4

= 3 × 0.425 moles

≈ 1.275 moles

Now, we can calculate the mass of KNO3:

Mass of KNO3 = Number of moles of KNO3 × Molar mass of KNO3

= 1.275 moles × 101.10 g/mol

≈ 128.78 g

Next, we calculate the percent by mass of KNO3:

Percent by mass of KNO3 = (Mass of KNO3 / Total mass of the solution) × 100

Total mass of the solution = Mass of KNO3 + Mass of water

= 128.78 g + 900 g

= 1028.78 g

Percent by mass of KNO3 = (128.78 g / 1028.78 g) × 100

≈ 12.53%

Therefore, the percent by mass of KNO3 in the solution containing 43 g of K3PO4 dissolved in 900 g of water is approximately 12.53%.

Now, let's provide an explanation:

To calculate the percent by mass of KNO3, we need to determine the mass of KNO3 and then divide it by the total mass of the solution (which is the sum of the mass of KNO3 and the mass of water), and finally multiply by 100 to express it as a percentage.

First, we calculate the molar mass of KNO3 by summing up the atomic masses of its constituent elements: potassium (K), nitrogen (N), and oxygen (O). This gives us a molar mass of 101.10 g/mol.

Next, we convert the mass of K3PO4 to moles by dividing it by the molar mass of K3PO4. This gives us the number of moles of K3PO4 present in the solution.

Since the stoichiometric ratio between K3PO4 and KNO3 is 1:3, we can determine the number of moles of KNO3 by multiplying the number of moles of K3PO4 by 3.

Using the number of moles of KNO3, we calculate the mass of KNO3 by multiplying it by the molar mass of KNO3.

To calculate the percent by mass of KNO3, we divide the mass of KNO3 by the total mass of the solution (which is the sum of the mass of KNO3 and the mass of water) and then multiply by 100 to express it as a percentage.

The final result is approximately 12.53%, indicating that KNO3 constitutes about 12.53% of the total mass of the solution.

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