2) a plate has 259 colonies, with a sample volume of 10-6 ml. what was the original concentration in the sample? (1 pt)

A heat exchanger is to be designed to concentrate a solution flowing at 4000 L/h containing 4% solute to a solution of 4% solute. The feed solution is at a temperature of 30°C.

The evaporation occurs at atmospheric pressure. The process uses saturated steam at a pressure of 145 kPa. The heat transfer coefficient is taken as 2550 W/m²K. Let us determine the size of the heat exchanger. SolutionThe overall heat transfer coefficient isU = 1/h₁ + ∆x/k + 1/h₂

The evaporation temperature can be determined using steam tables: From the saturated steam tables, at a pressure of 145 kPa, the corresponding saturation temperature is 104.3°C.The overall heat transfer coefficient for the heat exchangerU = 1/h₁ + ∆x/k + 1/h₂

Where h₁ = heat transfer coefficient for hot fluid (saturated steam)h₂ = heat transfer coefficient for cold fluid∆x = thickness of the tubek = thermal conductivity of the tubeU = 1/h₁ + ∆x/k + 1/h₂ = 1/2550 + ∆x/237 + 1/350where ∆x = thickness of the tube

To determine the thickness of the tube, we have to calculate the LMTD.The initial and final temperatures for the hot fluid are t₁ and t₂ respectively. Similarly, the initial and final temperatures for the cold fluid are T₁ and T₂.LMTD = (t₁ - T₂) - (t₂ - T₁) / ln (t₁ - T₂) / (t₂ - T₁)

For the present problem, both the inlet and outlet temperatures of the cold fluid (feed solution) are known. However, for the hot fluid (saturated steam), only the inlet temperature is known. We can calculate the outlet temperature of the steam from the heat balance.Q = m₁Cp₁(t₁ - t₂) = m₂Cp₂(T₂ - T₁)

Q = Heat transferred

m₁ = mass flow rate of the steam

Cp₁ = Specific heat of steam

t₁ = Inlet temperature of steam

t₂ = Outlet temperature of steam

m₂ = mass flow rate of the feed solution

Cp₂ = Specific heat of the feed solution

T₁ = Inlet temperature of the feed solution

T₂ = Outlet temperature of the feed solution.

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To calculate the number of grams of NH3 produced from 2.40g of hydrogen with an excess of nitrogen: 3 H2 + N2 = 2 NH3.  The molar mass of ammonia (NH3) is 17.03 g/mol. Using the formula: mass = moles * molar mass, we find that mass of NH3 = 0.79 mol * 17.03 g/mol = 13.45g.

we can see that 3 moles of hydrogen react with 1 mole of nitrogen to produce 2 moles of ammonia. with 2.40g of hydrogen and an excess of nitrogen, approximately 13.45 grams of NH3 will be produced.

First, we need to determine the number of moles of hydrogen present in 2.40g. The molar mass of hydrogen (H2) is 2.02 g/mol, so we can calculate the number of moles using the formula: moles = mass/molar mass. Therefore, moles of hydrogen = 2.40g / 2.02 g/mol = 1.19 mol.Since there is an excess of nitrogen, it means that nitrogen is not the limiting reactant. Thus, all the hydrogen will react completely. According to the balanced equation, 3 moles of hydrogen produce 2 moles of ammonia. So, 1.19 moles of hydrogen will produce (1.19 mol * 2 mol NH3) / 3 mol H2 = 0.79 mol of NH3.Now, we need to calculate the mass of NH3 produced. The molar mass of ammonia (NH3) is 17.03 g/mol. Using the formula: mass = moles * molar mass, we find that mass of NH3 = 0.79 mol * 17.03 g/mol = 13.45g.

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To differentiate between the ETC being blocked at the first step and the second step, the compound that can help differentiate between the two steps is cytochrome c. The correct option is c.

If the ETC is blocked at the first step (ubiquinone ⇒ Complex III), cytochrome c would be in its reduced state.

On the other hand, if the ETC is blocked at the second step (Complex III ⇒ cytochrome c), cytochrome c would be in its oxidized state.

Therefore, the correct option is c

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Complete question:

We have established that an inhibitor causing the accumulation of reduced ubiquinone could block the ETC at any of three possible steps.

1. ubiquinone⇒ Complex III

2. Complex III ⇒cytochrome c

3. cytochrome c⇒ Complex IV

What would be different if the ETC were blocked at the first step listed compared with the second step listed? You would find that ubiquinone was reduced in both cases, but there would be a differentiating factor.

You can differentiate between the first step listed and the second step listed by knowing the oxidation state of which compound.

a. Complex III

b. Complex IV

c. ubiquinone

d. Complex I

e. Complex II

f. cytochrome c

Answer:

based on texture/ feel, oder/smell, melting/boiling point

Explanation:

Answer:

Smell it, drink it, throw it at someone.

Explanation:

If none of that hurts or kills anyone, you can mark everything that would off the list.

The two carbon-sequestering methods that could reduce the impact of deforestation are afforestation and agriculture.

Carbon sequestering

Afforestation

Agriculture

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If ∆H is positive, indicating an endothermic reaction, the higher temperature would further favor the products. On the other hand, if ∆H is negative, indicating an exothermic reaction, the higher temperature would favor the reactants.

a) The stoichiometric table for the reaction is as follows:

Initial (mol) Change (mol) Final (mol)

A A₀ -3X A₀ - 3X

B 0 X X

C 0 2X 2X

Here, A₀ represents the initial moles of A, X represents the conversion of A.

b) To determine the concentration of A, B, and C at 95% conversion, we need to calculate the final moles of A, B, and C using the stoichiometric table.

At 95% conversion, X = 0.95. Substituting this value into the stoichiometric table, we get:

Final moles of A = A₀ - 3X = A₀ - 3(0.95) = A₀ - 2.85

Final moles of B = X = 0.95

Final moles of C = 2X = 2(0.95) = 1.9

c) If the reaction is conducted at a higher temperature while maintaining the same pressure, it will affect the reaction rate and equilibrium position. In general, increasing the temperature increases the reaction rate, leading to higher conversions in a given time. At the same time, it can also affect the equilibrium position by shifting it towards the products or reactants, depending on the reaction's enthalpy change.

In this case, if the reaction is conducted at a higher temperature, the concentration of B and C at 95% conversion may increase compared to the previous experiment conducted at 75°C. The increased temperature would favor the forward reaction, resulting in a higher yield of products B and C at equilibrium.

However, the exact effect on the concentrations of B and C would depend on the specific thermodynamics of the reaction, including the enthalpy change (∆H).

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2 Na ( s ) + 2 H2O ( l ) = 2 NaOH ( aq ) + H2 ( g )

Here's the balanced equation

One mole of NaOH = 40g NaOH

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in water

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,

One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,we have 6 moles of NaOH so we need 6 litres of Water olto prepare 1M Solution

Answer:

The energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

Explanation:

There's no diagram....but I kinda figured it from the description.

The best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

During aerobic cellular respiration, glucose reacts with oxygen, forming ATP ( Adenosine triphosphate) that can be used by the cell. Carbon dioxide and water are created as byproducts. The overall equation for aerobic cellular respiration is: In cellular respiration, glucose and oxygen react to form ATP ( Adenosine triphosphate)

Adenosine triphosphate is an organic compound which gives energy to living organisms to drive many operations in living cells such as muscle contraction, muscle pumps, nerve impulse propagation, condensate dissolution, and chemical synthesis.

Therefore, the best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.

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Answer:

Weak electrolyte

Explanation:

weak bases are ammonia (NH3), methylamine (CH3NH2), and ethylamine (C2H5NH2)

The term that describes the electrolyte capacity of methylamine (CH₃NH₂) which partially dissociates in water is Weak electrolyte.

Because it dissolves in water only partially into ions, methylamine (CH₃NH₂)  is a weak electrolyte. A small amount of electrical current can conduct when certain methylamine molecules split apart into ions CH₃NH₃⁺ and OH⁻ in a solution. Weak electrolytes have a moderate level of electrical conductivity compared to strong electrolytes which almost entirely dissociate into ions and non-electrolytes which do not dissociate.

This is because weak electrolytes exhibit intermediate conductivity due to their partial ionization. Understanding this behavior is crucial for understanding how solutions behave and how weak acids and bases like methylamine, affect chemical reactions.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

2.358

Explanation:

Answer: 2.538

Explanation: You have to round the fourth figure from the left, you eliminate the one

Answer:

1. H2O is a covalent bond, NaCl is an ionic bond

2. H2O uses hydrogen bonding (H-bonds), NaCl does not

3. H2O is liquid at room temperature. NaCl is solid.

Explanation:

Answer:

B) 27.94

Explanation:

All other last digits are wrong except b

Answer:

\( \frac{39.25 + 150.}{6.773} = 27.94182\)

Explanation:

\(1. \: (39.25 + 150.) \div (6.60 + 0.173) \\ 2. \: (39.25 + 150.) \div 6.773 \\ 3. \: (39.25 + 150.) \times \frac{1}{6.773} \\ 4. \: \frac{(39.25 + 150.) \times 1}{6.773} \\ 5. \: \frac{39.25 + 150.}{6.773} = 27.94182\)

The way in which temperature leads to weathering of rocks is as follows: Rocks expand and contract when they are heated and cooled which cause them to break (option C).

Rock weathering is the mechanical or chemical breaking down of rocks in situ by weather or other causes.

Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, the rock crumbles.

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Josef Loschmidt and Amedeo Avogadro both made important contributions to our understanding of basic molecular numbers, which are essential concepts in chemistry.

Amedeo Avogadro is credited with Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain the same number of particles, regardless of their chemical nature and physical properties. This law allowed Avogadro to propose that the volume of a gas is directly proportional to the number of gas molecules present, leading to the development of the Avogadro constant, which is the number of particles (atoms, molecules, or ions) in one mole of a substance.

Josef Loschmidt, on the other hand, is known for his contributions to our understanding of molecular sizes and numbers. He was the first to calculate the number of molecules in a cubic centimeter of gas using kinetic theory, which is now known as the Loschmidt constant or the Avogadro number. This constant is defined as the number of particles in one mole of a gas at standard temperature and pressure .

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Answer:

4.5 times 10 = 45

Explanation:

"Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."

Answer:

???????????

Explanation:

Answer:

Oxgen- cannot be separated

Water - chemical change

Gold - cannot be separated

Carbon Dioxide - chemical change

Carbon​ - cannot be separated

Explanation:

A pure substance, which can either be an element or a compound, contains only one type of such element or compound. In opposition to a mixture, pure substances cannot be separated by physical means.

- Elements as a pure substance cannot be separated because it contains only one type of atom. However, compounds contain two or more types of atoms, and hence, can only be separated into its individual atoms via chemical means.

In this question, oxygen (O2), Gold (Au) and carbon (C) are all elements and hence cannot be separated. Carbon dioxide (CO2) and water (H2O) are compounds because they contain two different atoms respectively, hence, can be separated into individual atoms.

Temperature, pressure, and the original type of rock is the correct answer i PROMISE :)

When you buy a municipal bond for $10,000 with a 4% interest rate and hold it until maturity in 10 years, you would typically receive interest payments semiannually.

Municipal bonds usually pay interest on a semiannual basis, meaning you receive two payments each year. To calculate the interest payment amount, you would divide the annual interest rate by 2, as you receive payments every six months. In this case, the annual interest rate is 4%, so the semiannual interest rate would be 2% (4% divided by 2). To determine the interest payment amount, you would multiply the bond's face value ($10,000) by the semiannual interest rate (2%). Thus, each interest payment would amount to $200 ($10,000 multiplied by 2%).

Over the course of 10 years, you would receive a total of 20 interest payments (2 payments per year for 10 years). Therefore, the cumulative interest payments would amount to $4,000 ($200 per payment multiplied by 20 payments). It's important to note that municipal bond interest payments and terms can vary, so it's essential to review the specific details of the bond before making any investment decisions.

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The correct option is C. They exist at specific energy levels.

Each electron has a set velocity in each energy level, hence an electron cannot adopt an endless number of velocities. Only a limited number of discrete energy levels may be obtained for the electrons in unbound atoms.

These distinct energy levels are linked to the electron orbits or shells in an atom, such as a hydrogen atom. The fact that only specific photon frequencies are permitted when electrons jump down from higher levels to lower levels, creating the hydrogen spectrum, is one consequence of these quantized energy states.

The Schrodinger equation for the hydrogen atom was used to fill in large gaps in the Bohr model's predictions of the hydrogen atom's energies.

Therefore, The correct option is C. They exist at specific energy levels.

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the wire would be damaged! oil damage to cables can be severe and will ultimately result in cable failure, downtime, and replacement costs.

:) hope this helps

Answer:

the answer is flowering plant.

Explanation:

i hope it helps. later.

There are a few methods that can be used to determine the volume of hydrogen produced during the electrolysis of sodium chloride. Here is one method:

1. Set up the electrolysis cell with the sodium chloride solution as the electrolyte and the electrodes in place. Make sure the cell is sealed and that the hydrogen and oxygen produced during the reaction can be collected.

2. Turn on the power supply and start the electrolysis reaction. Make sure to monitor the reaction and record any relevant data, such as current, voltage, and time.

3. When the reaction is complete, turn off the power supply and carefully remove the hydrogen and oxygen gas collectors from the cell.

4. Measure the volume of the hydrogen gas collected using a gas displacement method. This can be done by measuring the volume of water displaced by the gas in a graduated cylinder or by using a gas pressure gauge to measure the pressure of the gas and converting the pressure to volume using the ideal gas law.

5. Calculate the volume of hydrogen produced by subtracting the volume of oxygen produced from the total volume of gas produced. This value represents the volume of hydrogen produced during the electrolysis reaction.

6. If desired, the mass of the hydrogen produced can be calculated by multiplying the volume of hydrogen by its density. The density of hydrogen gas at standard temperature and pressure (STP) is 0.08988 g/L.

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I would first gather the required materials before using the appropriate method to analyse the volume of hydrogen generated during the electrolysis of sodium chloride.

This would consist of a gas syringe, electrodes, a power source, a beaker, and a sodium chloride solution. I would then get started on the solution. To make the necessary amount of sodium chloride, I would measure it out and mix it with distilled water.

After that, I would add the solution to the beaker. I would then prepare the experiment. The electrodes would be connected to the power source, and then placed inside the beaker. The power supply would then be turned on, and I would wait for the electrolysis to begin.

To collect the generated gas, I would use the gas syringe. I would keep track of the amount of gas created before figuring out the amount of hydrogen produced. I would be able to precisely gauge the volume of hydrogen generated during the electrolysis of sodium chloride using this technique.

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The total of all protons and neutrons is Option D, which is the right response. Protons, neutrons, and electrons are the three fundamental particles that make up an atom.

The nucleus of an atom is made up of protons and neutrons, which are collectively referred to as nucleons and are primarily responsible for an atom's mass. Neutrons weigh 1.6749 x 10-27 kg, whereas protons weigh 1.6726 x 10-27 kg.

Protons and neutrons make up the majority of an atom's mass when added together. However, electrons contribute very little to the mass of the atom due to their much smaller mass of 9.11 x 10-31 kg. As a result, Option D is the right response.

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Answer:

After the reaction, the total mass of the products must be D. Less than 10.0 grams