to make a 4ormalin aqueous solution, which should you dissolve the formaldehyde in

The statement that best describes the main function of the digestive system is to break down and absorb food, option (D) is correct.

When we eat, our food must be broken down into smaller molecules so that our bodies can absorb the nutrients we need for energy, growth, and repair. The digestive system is responsible for this process, which begins in the mouth with chewing and continues through the esophagus, stomach, small intestine, and large intestine.

In addition to breaking down food, the digestive system also plays a role in eliminating waste products from the body. The large intestine absorbs water and electrolytes from undigested food, while the rectum and anus eliminate solid waste from the body, option (D) is correct.

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The complete question is:

Which of the following best describes the main function of the digestive system?

A To provide an external boundary for the body

B To transport oxygen to body cells while removing waste

C To send and receive chemical messages

D To break down and absorb food

Answer:

Malachite

Explanation:

Malachite is the only listed compound that must contain copper and oxygen.

Copper and oxygen are both elements found on the periodic table. They have the following symbols;

         Copper  = Cu

         Oxygen  = O

From the given choices, only option 1 has the symbol Cu and O.

So only malachite contains both copper and oxygen.

Concentrations are defined as the amount of a material divided by the volume that it is dissolved. A concentrated solution contains a significant amount of dissolved solute. A dilute solution is one with a small amount of dissolved solute.

When sugar dissolves in water, the weak bonds between the individual sucrose molecules are broken, and these C12H22O11 molecules are released into solution. It also requires energy to disrupt this same hydrogen bonds in water that have to be broken in order to insert one of these disaccharides into solution.

Positive and negative ions are held together in ionic solids (or salts) by the strong attraction between particles to opposite charges. When any of these solids dissolves in the water, the ions that make up the solid are published into solution and become entangled with the polar solvent molecules. When salts dissolve in water, they dissociate into their ions. Ionic compounds dissolve if the energy released by the ions when they interact to water molecules needs to compensate for the required to break this same ionic bonds inside the solid and also to separate the water so that the ions could be inserted into solution.

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Answer:scientists finished deciding the human genome in 2001. This research helped genetics analyze and islote sections of DNA for investigation. Without this information and the technology invented during the Human Genome Project, Hugh would not have been able to extract portions of his daughters DNA. Also, he wouldn’t have been able to see the genes that did not function properly in his daughters DNA.

Explanation: this is a right answer for PLATO.

The change in temperature of the metal is 6.1°C. Details about change in temperature can be found below.

The change in temperature of a substance can be calculated by subtracting the initial temperature of the substance from the final temperature.

According to this question, a 25.0 g sample of metal at 16.0 °C is warmed to 22.1 °C by 259J of energy.

This means that the change in temperature of the metal can be calculated as:

∆T = 22.1°C - 16°C

∆T = 6.1°C

Therefore, the change in temperature of the metal is 6.1°C.

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Answer: 6.1°C.

Explanation: just for some extra verification, the answer is indeed 6.1°C. Hope this helps and have a great day!

The increased distance across the cell will result in an increase absorbance reading.

The concentration of \([Fescn]_2\) would be affected if the cuvette had a 1.5 cm path length rather than the 1.0 cm value used.Since the absorbance of a sample is proportional to the concentration of a sample (as described by the Beer-Lambert law), increasing the path length of the cuvette would result in a decrease in absorbance. This means that the concentration of the sample would be lower than if the 1 cm path length was used. In other words, the concentration of \([Fescn]_2\)would be lower if the cuvette had a 1.5 cm path length than if it had a 1.0 cm path length.

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The chirality or handedness character of most standard amino acids causes solutions of amino acids to rotate the plane of polarized light.


The chirality of an amino acid refers to the fact that it has a central carbon atom (alpha carbon) bonded to four different groups: an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (-H), and a side chain (R group). This asymmetric arrangement creates a mirror image of the molecule, resulting in two possible configurations called enantiomers: L and D forms.  

When a beam of polarized light passes through a solution of amino acids, the molecules interact with the light and rotate the plane of polarization. This phenomenon is known as optical activity. The direction and degree of rotation depend on the specific amino acid and its concentration in the solution.  

In summary, the chirality or handedness character of most standard amino acids causes solutions of amino acids to rotate the plane of polarized light due to their asymmetric structure.

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The total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

Using the steam tables, we can determine the specific volume of water at the given pressure and temperature. The specific volume of water is 0.01658 \(ft^3/lbm\).

The mass of water in the container is 0.92 lbm, so the total volume of the water is:

V = m/v = 0.92 lbm / 0.01658 \(ft^3/lbm\)  = \(55.539 ft^3\)

Assuming the water is at saturation, we can find the total internal energy and enthalpy by using the values in the steam tables for saturated water at 100 psia.

From the steam tables, the total internal energy of saturated water at 100 psia is 358.05 Btu/lbm, so the total internal energy in the container is:

U = m * u = 0.92 lbm * 358.05 Btu/lbm = 329.77 Btu

From the steam tables, the enthalpy of saturated water at 100 psia is 419.02 Btu/lbm, so the enthalpy in the container is:

H = m * h = 0.92 lbm * 419.02 Btu/lbm = 385.14 Btu

Therefore, the total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

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Answer:

a) 74842.7 g

b) 0.1201 m

Explanation:

1 pound is 453.592 g  

165 pound = 74842.7 g

12.01 / 100 = 0.1201 m

Answer:

f2 4 answer. GG its right.

Explanation:

Answer:

hey the answer is in box f2 gg

Explanation:

The correct answer is 0.15.

We are aware that there is 0.05 mol of an unidentified hydrocarbon we will refer to as "X" and that its burning produces 6.6 g of carbon dioxide and 3.6 g of water.

These quantities might be converted to moles by applying the following formula:

amount= mass/ relative atomic mass

Thus, the following equation may be written for H2O: moles = 3.6 / 18 = 0.2 and for CO2: moles = 6.6 / 44 = 0.15.

0.05X + x'O2 = 0.15CO2 + 0.2H2O

This may be made simpler by dividing through by 0.05 (this step is likely to be the most helpful to you), resulting in:

1 x + x O2 = 3 co2 + 4 H2O

The hydrocarbon must have been the source of all the carbon in the carbon dioxide and all the hydrogen in the water.

Accordingly, 4 x 2 = 8 moles of H and 3 x 1 = 3 moles of C.

There are 3/1 = 3 Cs and 8/1 = 8 Hs in one X molecule.

This clearly identifies C3H8 or propane as the hydrocarbon X (dividing by 1 seems unnecessary, but it illustrates the process to use if there were more than one mol of X in the first equation).

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Explanation:

We can assume that room temperature is 25 °C.

The melting point of a pure substance is the temperature at which it changes state from solid to liquid. The metling point of our substance is -187 °C. Since the room temperature is 25 °C we can say that it won't be solid. At least it will be liquid.

The boiling point of a pure substance is the temperature at which it changes state from liquid to gas. The boiling point of our substance is 42 °C. At room temperature we are under that temperature, so it won't convert into a gas. It will remain as a liquid also.

Since room temperature is between the boiling and melting point of our substance, the physical state is liquid.

Answer: liquid

Net balanced equation is- 2Al(s) + 3Ni²⁺(aq) →  2Al³⁺(aq) + 3Ni(s)

In chemistry, a cell notation or cell representation is a simplified way to express an electrochemical cell reaction.

By omitting all other common ions and inactive substances, the two half-cells are represented in cell notation by writing the formula of each unique chemical species involved in the redox reaction across the cell. The species in each half-cell are grouped together and each species is divided by a vertical bar. A salt bridge is represented by two vertical bars or slashes separating the two half-cells (which generally contains an electrolyte solution such as possasium nitrate or sodium chloride that is left unwritten). It is customary to place the aqueous species closest to the double bar and to represent the anode to the left and the cathode to the right of the double bar.

Aluminium acts as anode while nickel act as a cathode.

Oxidation -  Al(s) → Al³⁺(aq) + 3e⁻   x2

Reduction - Ni²⁺(aq) + 2e⁻ → Ni(s)   x3

Thus, Net balanced equation- 2Al(s) + 3Ni²⁺(aq) →  2Al³⁺(aq) + 3Ni(s)

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Your question is incomplete please find the complete question over the internet.

The percentage composition of each enantiomer is r = 70% and s = 30%.

To determine the percent composition of each enantiomer in the mixture, we need to use the specific rotation values and apply mathematical calculations. Let's assume that the mixture consists of a certain percentage of the R enantiomer and the remaining percentage of the S enantiomer.

The specific rotation of the S enantiomer = +10.0

The specific rotation of the mixture = +3.0

We can use the following equation to calculate the percent composition:

The specific rotation of the mixture = (Percent composition of R * Specific rotation of R) + (Percent composition of S * Specific rotation of S)

Substituting the given values:

+3.0 = (Percent composition of R * 0) + (Percent composition of S * +10.0)

Since the specific rotation of the R enantiomer is not given, we assume it to be 0 (or it cancels out in the equation).

Simplifying the equation:

3.0 = 10.0 * (Percent composition of S)

Dividing both sides by 10.0:

(Percent composition of S) = 3.0 / 10.0 = 0.3

The percent composition of the S enantiomer is 0.3, or 30%.

To determine the percent composition of the R enantiomer, subtract the percent composition of S from 100%:

Percent composition of R = 100% - 30% = 70%

Therefore, the percent composition of the R enantiomer is 70%.

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Answer:

Sn, Sb, Te, Ga, As

Explanation:

Answer:

A loan pair is when you borrow something but then give it back after a set amount of time.

Explanation:

The equation that may be used to find the flood peaks in linear form (y=mx+c) is: β * ln(-ln(G)) + 655

y represents the flood peak values (in this case, the 20-year flood peak design values),

k is a constant related to the shape of the Gumbel distribution,

P is the probability of exceedance (in this case, the probability of a flood peak being exceeded in a given year),

ln denotes the natural logarithm, and

c is the intercept of the linear equation.

The equation for the Gumbel distribution is:

G = exp(-exp(-(y - μ) / β))

where G is the probability of exceedance, y is the flood peak value, μ is the location parameter (mean), and β is the scale parameter.

The average (mean) value for the data is 655 m³/s, we can substitute this value into the equation as μ.

The equation then becomes:

G = exp(-exp(-(y - 655) / β))

To convert this equation to linear form (y=mx+c), we need to take the natural logarithm of both sides:

ln(G) = -exp(-(y - 655) / β)

Rearranging the equation, we get:

exp(-(y - 655) / β) = -ln(G)

Taking the exponential of both sides, we have:

-(y - 655) / β = ln(-ln(G))

Multiplying both sides by -β, we get:

(y - 655) = -β * ln(-ln(G))

Finally, rearranging the equation, we have:

y = -β * ln(-ln(G)) + 655

This is the equation in linear form (y=mx+c) for the 20-year flood peak design, where m = -β and c = 655.

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Answer:

I agree

Explanation:

For scientists working in classified areas, collaboration with university programs and researchers provides opportunities to expand and strengthen their science through the conduct of peer-reviewed, open literature research.

HEY!

Mayonnaise is an oil in water (O/W) emulsion; ingre- dients are primarily vegetable oil, egg yolk, sodium chloride, water and vinegar. Its relative stability towards microbial spoil- age has been attributed to the high salt content (in the water phase) and low pH, due to the vinegar.

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Chemical weathering is an example of Airborne oxygen reacts with the iron content of rocks, causing them to change color.

Chemical weathering is a process in which things disintegrate due to chemical reactions, mostly with water and compounds dissolved in it, rather than mechanical processes.

A) Freezing water widens fissures in rocks is a physical phenomenon in which water stuck inside crevices in rocks expands when frozen at lower temperatures. In this method, no chemical changes are seen.

B) Plant roots force their way into cracks in rocks and finally shatter them. This is a physical process in which plant roots search for water and nutrients in fissures in rocks and eventually break them. There are no chemical changes visible here.

C) Oxygen in the air reacts with iron content in rocks, causing them to change color; as we can see, the color of rocks is changing as a result of a chemical reaction between oxygen in the air and iron content in the rocks. This process is also characterized by rock disintegration. As a result, this is referred to as chemical weathering.

D) Strong winds physically peel soft rock away, leaving harder rock behind There is no visible chemical change.

As a result, the correct solution is Option C), which provides completely adequate modifications to be classified as chemical weathering.

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A heat sensing resistor that changes its value as its temperature changes is known as a Thermistor.

The Thermistor is a special type of variable resistive detail that adjustments its physical resistance while uncovered to modifications in temperature. The Thermistor is a solid kingdom temperature sensing device which acts a chunk like an electrical resistor however is temperature touchy. A thermistor is a temperature sensitive resistor. they may be regularly used as a temperature sensor.

Thermocouples are the maximum generally used form of temperature sensor. they are used in business, automotive, and purchaser programs. Thermocouples are self-powered, require no excitation, can function over a extensive temperature variety, and feature brief response times.

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Answer:

Grey school buses would likely get in more accidents because other drivers are expecting a yellow bus to make frequent stops and the lights and stop sign are noticeable on a brighter color.

Explanation:

yellow buses are easier to see in fog than a grey bus

Answer:

4 mol FeCl3

Explanation:

\(6molCl_{2} *\frac{2mol FeCl_3}{3molCl_2}\) = 4 mol FeCl3

Use the train-track method shown up above. We are simply setting up molar ratios derived from balanced equation to solve this.

Taking into account the reaction stoichiometry, 165 moles of Al are required to produce 495.0 grams of H₂.

In first place, the balanced reaction is:

6 NaOH + 2 Al  → 2 Na₃AlO₃ + 3 H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 6 grams of H₂ are produced by 2 moles of Al, 495 grams of H₂ are produced by how many moles of Al?

moles al Al= (495 grams of H₂×2 moles of Al) ÷6 grams of H₂

moles of Al= 165 moles

Finally, 165 moles of Al are required.

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Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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Answer:

(SrSe) | SeSr - PubChem.

Explanation:

Answer:

Decomposition reaction

Explanation:

When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.

Option B is correct