Why would scientists use a control sample that is known to be from a
specific species in an eDNA surveillance for that species?
A. So they can have a negative control against samples
B. So they can cut sample DNA into fragments
C. So they can amplify the DNA in small samples
D. So they can identify samples that contain the target DNA

Answer:

Since the tape has extra electrons, it has a negative charge. When you move your finger close to the tape, electrons in your skin are repelled and move away. This makes the skin on your finger tip have a slight positive charge. Since positive and negative attract, the tape moves toward your finger.

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

Hydrogen fuel typically reacts with oxygen in a chemical reaction to produce water (H2O) as the main product. The chemical equation for this reaction is:

2H2 + O2 → 2H2O

The reaction releases energy, which can be harnessed to power engines or generate electricity. When hydrogen fuel is burned in an engine or fuel cell, the only byproduct is water vapor, which is harmless to the atmosphere.

However, the production of hydrogen fuel can have environmental impacts if it is not produced using renewable energy sources. The most common method of producing hydrogen involves using natural gas, which releases carbon dioxide and other greenhouse gases into the atmosphere. Therefore, it is important to consider the source of the hydrogen fuel and the environmental impact of its production when evaluating its benefits for reducing emissions and improving air quality.

The chemical equation for the combustion of hydrogen can be represented as follows: 2H₂ + O₂ → 2H₂O

In this reaction, two molecules of hydrogen gas (H₂) combine with one molecule of oxygen gas (O₂) to form two molecules of water vapor (H₂O). The reaction releases a significant amount of energy in the form of heat.

The products of the combustion of hydrogen, which are water molecules, do not have significant adverse effects on the atmosphere. Water vapor is a natural component of the Earth's atmosphere, and its presence is essential for various natural processes, such as the water cycle.

However, it is important to note that the combustion of hydrogen as a fuel can indirectly affect the atmosphere in certain scenarios. One consideration is the generation of the primary energy used to produce the hydrogen fuel.

Additionally, the transportation and storage of hydrogen as a fuel may present challenges. If there are any leaks or improper handling, hydrogen gas can contribute to the formation of local air pollution. However, these issues can be managed through appropriate safety measures and technology advancements.

Overall, the combustion of hydrogen fuel with oxygen produces water as a product, and the water vapor does not have direct adverse effects on the atmosphere.

However, the environmental impact associated with hydrogen as a fuel depends on the methods used for its production and transportation. Sustainable production methods, such as electrolysis using renewable energy sources, can minimize the environmental impact of hydrogen fuel.

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Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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Answer:

\(m_{H_2O}=9.24gH_2O\)

Explanation:

Hello there!

In this case, since there is a 2:2 mole ratio between sodium peroxide and water according to the given reaction, it is possible to apply the following stoichiometric setup for the calculation of the required mass of water:

\(m_{H_2O}=40.0gNa_O_2*\frac{1molNa_O_2}{78gNa_O_2}*\frac{2molH_2O}{2molNa_O_2} *\frac{18.02gH_2O}{1molH_2O} \\\\m_{H_2O}=9.24gH_2O\)

Best regards!

Answer:

Is like for solving for the solution for both equations??

The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.

This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.

In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.

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If we triple the number of moles in the gas vessel at constant pressure, the new volume will be three times the initial volume.

According to Avogadro's law, the volume of a gas is directly proportional to the number of moles of gas present at constant temperature and pressure. Therefore, if we triple the number of moles in the gas vessel while keeping the pressure constant, the new volume will also triple.

More specifically, we can use the following formula to calculate the new volume (V2):

n1/V1 = n2/V2

Rearranging this formula to solve for V2 gives:

V2 = n2 * V1 / n1

Substituting the given values, we have:

n1 = initial number of moles

n2 = 3 * n1 (since we triple the number of moles)

V1 = initial volume

V2 = (3 * n1) * V1 / n1

Simplifying the equation, we have:

V2 = 3 * V1

Therefore, the new volume (V2) will be three times the initial volume (V1) if we triple the number of moles in the gas vessel while keeping the pressure constant.

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The concentration of lead in the solution is 4.8 ppm.

The ppm (parts per million) is a unit used to express the concentration of a solution. It is defined as the number of parts (by mass) of a solute per million parts (by mass) of the solution. To convert from grams per 100 grams to ppm, we can use the following formula:

ppm = (mass of solute/mass of solution) x 10^6

In this case, the mass of solute (lead) is 0.00048 g, and the mass of solution is 100. g. Plugging these values into the formula, we get:

ppm = (0.00048/100) x 10^6

ppm = 4.8

Therefore, the concentration of lead in the solution is 4.8 ppm.

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Phosphorus triiodide is a nonpolar molecule.

We have to note that the polarity of a molecule would have a lot to do with the shape of the molecule. In other words, the arrangement of the atoms in the molecules tell us if the molecule would be polar or not.

The three iodine atoms are symmetrically positioned around the center phosphorus atom because the molecule has a trigonal pyramidal structure. As a result, the three P-I bonds' respective dipole moments cancel out and provide a net dipole moment of zero.

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Answer:

1 a

2 b

3 c

4 d

5 e

Explanation:

i know is corret

Answer:

The time taken is  \(t = 1.11 *10^{-9} \ s\)

Explanation:

From the question we are told that

    The  rate constant is  \(k = 1.50 *10^{10} \ L /mol \cdot s\)

    The initial concentration of iodine atom  is  \([I] = 2.0*10^{-2} \ M\)

Generally the integrated  rate law for a second order reaction is  mathematically represented as

        \(\frac{1 }{[I_r]} = \frac{1}{[I]} * k * t\)

Where \([I_r]\) is the concentration of the remaining iodine atom  after the recombination which is mathematically evaluated as

      \([I_r ] = [I_o ] *\)[100%  - 94%]

The reason for the 94%  is that we are told from the question that only 94% of the iodine atom recombined

=>  \([I_r ] = [I_o ] *\)[6%]

=>  \([I_r ] = [I_o ] *0.06\)

substituting values

    \([I_r ] = 2.0 *10^{-2}*0.06\)

    \([I_r ] = 1.2 *10^{-3}\)

So

    \(\frac{1 }{1.2 *10^{-3}} = \frac{1}{2.0 *10^{-2}} * 1.50*10^{10} * t\)

  \(t = 1.11 *10^{-9} \ s\)

It will take "1.11 × 10⁻⁹ s".

A process wherein the two or even more compounds collide with both the proper orientation as well as enough effort to generate a new substance or the outcomes, is considered as Chemical reaction. This process involves the breaking as well as formation of atom connections.

According to the question,

Rate constant, k = 1.5 × 10¹⁰ L/mol.s

Initial concentration, [I] = 2.0 × 10⁻² M

By using the integrated rate law,

→ \(\frac{1}{[I]_r} = \frac{1}{[I]}\) × k × t ...(Equation 1)

Now,

The concentration of remaining Iodine atom,

[\(I_r\)] = [\(I_o\)] × [100% - 94%]  

     = [\(I_o\)] × 6%

     =  [\(I_o\)] × 0.06

By substituting the values is above equation,

[\(I_r\)] = 2.0 × 10⁻² × 0.06

     = 1.2 × 10⁻³

hence,

The time taken will be:

\(\frac{1}{[I]_r} = \frac{1}{[I]}\) × k × t

By substituting the values,

\(\frac{1}{1.2\times 10^{-3}} = \frac{1}{2.0\times 10^{-2}}\) × 1.50 × 10 × t

           t = 1.11 × 10⁻⁹ s

Thus the above answer is correct.

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Answer:

Mg3N2

Explanation:

divide 50 by 6 (molar ratio) and you get something more than 8

since Mg3N2 is less it is the limiting reactant

Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

Answer:

1.904 ppm

Explanation:

Concentration of drug in units of ppm = mass of solute / (mass of solution ) × 1000000

mass of blood = density of blood × volume = 1.05 g / ml × 5000 ml = 5250  g

mass of solution = mass of blood + mass of solute ( statin) = 5250 + 0.01 g  = 5250.01 g

Concentration of drug in units of ppm = (0.01 g / 5250.01 g) × 1000000 = 1.904 ppm

I hope this helps!!

The volume of acid we will require in this situation is 27000 mL.

We are aware that understanding the reaction equation is necessary because it is the first step in resolving the issue at hand;

Having said that,

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Acid molarity = antilog (-1.55).

The number of base moles;

38 g/100 g/mol

= 0.38 moles

If 2 moles of acid and 1 mole of base combine;

The base responds with 0.38 * 2/1 moles.

= 0.76 moles

Volume = n/M

= 0.76/ 0.028

= 27 L or 27000 mL

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According to the placement of elements in the periodic table and the atomic structure, protons from atom on right will attract electrons from atom on left.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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There are vacant orbitals on the phosphorus atom that allows it to expand its octet.

There is a concept that we would need to consider as we are answering the question that we here and that is the idea of the octet rule. The octet rule states that it is only about eight electrons that can be found on the outermost shell of an atom and as such all of the compounds can be formed in obedience to this rule.

Now we should know that there are no vacant d orbitals that are present on the nitrogen atom and this stems from the fact that it does not have a 3d level as such there are no orbitals that can be able to help the Nitrogen atom so as to be able to expand its octet. This is the reason why its pentafluoride can be easily formed.

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Convert 63 ng/L to fg/cm³ is 63 × 10³ fg/cm³.

In this given question , we have to convert ng to fg that is nanogram to femtogram

and L to cm³ that is liter to cubic centimeter.

1 nanogram (ng) = 1000000 femtograms (fg) or 10⁶ fg

1 nanogram  (ng) = 10⁶ fg  

1 liter = 1000 cubic centimeter (cm³)

1 L = 1000 cm³

to convert 63 ng/L to fg/cm³,

63 ng/L = (63 × 1000000 ) fg / 1000 cm³

             = 63000000 fg / 1000 cm³

             = 63000 fg/cm³

             = 63 × 10³ fg/cm³

Thus, the conversion , 63ng/L to fg/cm³ is 63 × 10³ fg/cm³.

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Answer:

b = 56.67 m

Explanation:

It is given that,

Area of the triangular field is 255 m²

We need to find the base of the field if its height is 9 m.

The area of a triangle is given by :

\(A=\dfrac{1}{2}\times b\times h\\\\b=\dfrac{2A}{h}\\\\b=\dfrac{2\times 255}{9}\\\\b=56.67\ m\)

So, the base of a triangle is 56.67 m.

Answer:

im not sure

Explanation:

i went on here looking nobody answered yet

Pressure and volume have an indirectly proportional relationship

Ideal gas laws can help us describe the relationship between different values for gases.

Boyle's Law

The ideal gas law that connects pressure and volume given a constant temperature is Boyle's law. Boyle's law is represented as:

This equation shows that pressure and volume have an indirectly proportional relationship. This means that as pressure increases, volume decreases and vice versa. So, pressure and increase opposite of each other.

Indirect Relationships

Indirect relationships occur when one value and the reciprocal of another are proportional. For example, pressure and 1/volume are directly proportional. This function looks like a decreasing exponential function. Attached is an example of a volume vs. pressure graph.

Answer: c – Reactant 1

Explanation:

Since HNO3, (Nitric Acid), is an acid, that leaves Mg(OH)2 to be the Base in the reaction.

Hence the answer is Reactant 1

Answer:

it's c

Explanation:

maybe...I don't know how I works it out but it is c

Physical change example: Melting of ice: When ice melts, it undergoes a physical change as its state changes from solid to liquid. The chemical composition of water molecules remains the same.

Chemical change example: Burning of wood: When wood burns, it undergoes a chemical change as it reacts with oxygen in the air to produce carbon dioxide, water vapor, and ash. The chemical composition of the wood changes during the burning process.

Sport example: Basketball - Friction, gravity, and inertia affect the movement of the ball and the players during the game. Friction between the ball and the court surface allows players to dribble the ball and make cuts and stops.

Gravity affects the arc of the ball when it's shot and how high it bounces. Inertia affects the movement of players when they run, jump, or change directions.

Electromagnetic energy in order of longest to shortest wavelength: Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

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Cite one specific example each of a physical change and a chemical change.

Choose a sport, and then describe how friction, gravity, and inertia affect the action.

List these forms of electromagnetic energy in order from longest to shortest wavelength:

Answer:

3 electrons more

explanation

minus sign in chemistry means more

homeworkstudycom

Answer

0.0779 g SO₃

Procedure

To solve this question, you will need to use the Avogadro's number equivalent to 6.02214 x 10^23 molecules/ mol, and then the molecular weight in grams per mole for the SO₃.

The reaction has a first order in Cl 2 and a second order in NO. The general order of reactions is 2+1 = 3.

We must ascertain the values of the exponents n, m, and p as well as the rate constant, k, in order to derive a rate law. The values of the coefficients required to formulate the rate law are available to us if the reaction orders for a reaction are provided.

The reaction's rate law is rate, starting from the slow step

k'[NOCl2][NO] - (1).

Fast step is used to determine the concentration of NOCl 2, which is an intermediate.

[NOCl 2]=K[NO][Cl2] - (2)

Substitute (2) in (1)

rate=k'K[NO][Cl2][NO]

Hence, rate =k[NO]2[Cl]

The reaction has a first order in Cl 2 and a second order in NO. The general order of reactions is 2+1=3

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Alleles and traits related as D. Alleles are distinct versions of genes, and they code for traits, which are distinct forms of characteristics.

Alleles and traits are closely related in terms of genetics and inheritance. Alleles are alternative forms of a gene that occupy the same locus on a chromosome. They represent different variations of a specific gene. Traits, on the other hand, are the observable characteristics or features of an organism that are determined by the combination of alleles.

Each individual inherits two alleles for a particular gene, one from each parent. These alleles can be the same (homozygous) or different (heterozygous). The combination of alleles determines the expression of traits in an organism. For example, in the case of eye color, the gene may have alleles for blue and brown eye color. An individual may inherit two blue alleles (homozygous), resulting in the trait of blue eyes, or they may inherit one blue and one brown allele (heterozygous), resulting in the trait of brown eyes. In summary, alleles are distinct versions of genes, and they code for the different variations of traits or characteristics that are observed in organisms. The correct answer is D. Alleles are distinct versions of genes, and they code for traits, which are distinct forms of characteristics.

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Answer:

C = 107.97 mol/L

Explanation:

Given data:

Volume of solution = 1.38 mL (1.38 mL× 1 L /1000 mL = 0.00138 L)

Mass of ammonium sulfite = 17.36 g

Concentration of solution =?

Solution:

We will calculate the number of moles of ammonium sulfite.

Number of moles = mass/molar mass

Number of moles = 17.36 g / 116.15 g/mol

Number of moles = 0.149 mol

Concentration:

C = n/V

C = concentration

n = number of moles of solute

v = volume in L

C = 0.149 mol / 0.00138 L

C = 107.97 mol/L