would you expect the dissolved oxygen levels in water sampled from a stream entering a lake to be higher or lower than the dissolved oxygen levels in water sampled from the lake itself? explain why.

D.) CI

Hi and Bye, have a good one. '^'

Empirical formula of the anhydrous salt is  CuSiF₆

The formula of the hydrate is CuSiF₆.6H₂O

The molecular formula of a compound is the simplest integer ratio of the atoms present in the compound. As a simple example of this concept, the empirical formula for sulfur monoxide (SO) is simply SO, as is the empirical formula for Di-sulfur dioxide S₂O₂

Consider mass of Cu = 30.9 g

mass of Si = 13.6 g

mass of F = 55.5 g

Now for empirical formula, let's calculate the moles of each element:

Moles of Cu = 30.9/63.5=.49 moles

Moles of Si = 13.6/28.0=.49 moles

Moles of F = 55.5/19=2.92 moles

As you can see the moles of Cu and Si are almost 6 times the moles of F, which result in the empirical formula of salt as;  CuSiF₆

Now, for the formula of  hydrate:

Moles of CuSiF₆ = 1/205.62

= 0 .00486 moles

weight of H₂O = 1.53-1

= 0.53 g

Moles of H₂O = .53/18

= 0.029 moles

CuSiF₆ : H₂O = 0.00486 : 0.029

= 0.029/0.00486

= 1:6

So the molecular formula of hydrate is CuSiF₆.6H₂O

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The partial pressure of N₂ = 0.158 atm

The partial pressure of H₂ = 3.6 atm

The partial pressure of NH₃ = 0.22 atm

Mass of N2₂ = 4.97 g

Molar mass of N₂ = 28 g/mol

Mass of H₂ = 8.80 g

Molar mass of H₂ = 2 g/mol

Mass of NH₃ = 4.2 g

Molar mass of NH₃ = 17 g/mol

Total pressure (Pt) = 3.97 atm

Partial pressure of N₂ = ?

Partial pressure of H₂ = ?

Partial pressure of NH₃ = ?

First, we will find out the number of moles of each component

    Number of moles = mass / molar mass

    Number of moles of N₂ = 4.97 g / 28 g/mol

    Number of moles of N₂ = 0.1775 mol

    Number of moles of H₂ = 8.08 g / 2 g/mol

    Number of moles of H₂ = 4.04 mol

    Number of moles of NH₃ = 4.22 g / 17 g/mol

    Number of moles of NH₃ = 0.2482 mol

Total number of moles = 0.1775 mol + 4.04 mol + 0.2482 mol

Total number of moles = 4.4657 mol

Now find out the partial pressure for each component

partial pressure = number of moles of each / total number of moles × total pressure

    partial pressure of N₂ = (0.1775 mol / 4.4657 mol) 3.97 atm

    partial pressure of N₂ = (0.0397 mol) 3.97 atm

    partial pressure of N₂ =  0.158 atm

    partial pressure of H₂ = (4.04 mol / 4.4657 mol) 3.97 atm

    partial pressure of H₂ = (0.9047 mol) 3.97 atm

    partial pressure of H₂ = 3.6 atm

    partial pressure of NH₃ = (0.2482 mol / 4.4657 mol) 3.97 atm

    partial pressure of NH₃ = (0.0556 mol) 3.97 atm

    partial pressure of NH₃ = 0.22 atm

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Sodium acetate will form the basic salt when dissolved in water.

Water turns basic when a salt made from a strong base and a weak acid dissolves in it. Sodium ions and acetate ions are created when sodium acetate dissociates in water. There are no acidic or basic characteristics in the sodium ion. The conjugate base of acetic acid, the acetate ion, has a high affinity for H+ ions.

The solution turns acidic when a salt made from a potent acid and a feeble base dissolves in water. Chloride ions and ammonium ions are created when ammonium chloride dissociates. No affinity exists between the chloride ion and H+ ions.

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viral symmetry that is both icosahedral and helical and possibly other symmetry is collectively referred as complex.

what is symmetry?

Chemistry terms like "molecular symmetry" refer to the symmetry that exists in molecules as well as how they are categorised. As it may be used to predict or explain many of a molecule's chemical characteristics, including its dipole moment and its permitted spectroscopic transitions, molecular symmetry is a key concept in chemistry.

An action that results in an object's appearance remaining unchanged is known as a symmetry operation. For instance, a water molecule will retain its original appearance if it is rotated by 180 degrees around an axis that runs through the centre O atom (located in the middle of the two H atoms). Each symmetry operation has a corresponding symmetry element, which can be an axis, a plane (2 dimensions), a line (1 dimensions), or a point (0 dimensions), with regard to which the symmetry operation is performed

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the human activities like coal tar minings, foctory out let releasing the carbon gases out with out filtering, air polluting activities, over using personal vehicles for unnecessary activities,  and many other reasons that are briefly explained below

what is global warming?

a steady rise in atmospheric temperature often attributed to the greenhouse effect brought on by higher quantities of carbon dioxide, chlorofluorocarbons, and other pollutants.

The quantity of carbon dioxide emitted by human activity each year is at least 60 times greater than that produced by volcanoes. Large, ferocious eruptions may, for a few hours, match the pace of human emissions, but they are too uncommon and brief to come close to the yearly emissions of humans. In fact, the annual carbon dioxide emissions from a few specific U.S. states exceed those of the planet's entire active volcanoes.

In 2015, around 40 billion metric tonnes of carbon dioxide were released into the atmosphere as a result of human activity, mostly the burning of coal and other fossil fuels, but also cement manufacture, deforestation, and other landscape changes. The Global Carbon Project estimates that since the beginning of the Industrial Revolution, human activities have contributed more than 2,000 billion metric tonnes of carbon dioxide to the atmosphere.

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The half life of the radioactive isotope is 25 million years.

The half life of the substance - The half life of the substance is the time taken by the substance to decay to its half concentration of the initial value.

All the radioactive reaction follows first order kinetics,

So, it means that,

If in 200 million years, only 1/16 of the original amount of the radio active atoms in a sample.

It means before 100 million years, the amount of the radioactive atoms were 1/8.

similarly, 50 million years, the amount of the radio active atoms were 1/4.

Continuing the pattern, 25 million years, the amount of the radio active atoms were 1/2.

So, after 25 million years, the amount of radioactive atoms in the sample left are 1/2 of the original amount.

So, the half life of the sample is 25 million years.

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C2HBrClF3 and O2 have partial pressures of 84 torr and 778 torr, respectively.

Given,

C2HBrClF3 mass = 15.0 g

O2 mass is 22.6 g.

C2HBrClF3's molar mass is 197.4 g/mole.

O2's molar mass is 32 g per mole.

Raoult's Rule

Xsolvent = Psolution

P0solvent

P solution is the solution's vapour pressure.

"solvent" is the solvent's mole fraction.

P0solvent = the pure solvent's vapour pressure

Raoult's Law-

Raoult's law states that the partial vapour pressure of a solvent in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction of the solvent in the solution.

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2 liters of chlorine gas react to produce 2 l of hydrogen chloride gas

We may think about STP.

Gaseous hydrogen chloride in 2 L

PV = nRT

P = 1 atm

V = 2L

n = ?

R = Gas Constant, or 0.0821 L atm K-1 Mol-1.

T = 273

enter and find n in the equation

1 x 2 = n x 0.0821 x 273

n = 08923 mole

An comparable amount of Cl2 gas is required for every 0.08923 mole of hydrogen chloride gas (0.08923 = 0.044615 mole).

as a result, volume of 0.044615 mole of Cl2

P = 1 atm V =?n = 0.044615" T = 273

1 x V = 0.044615 x 0.0821 x 273

V = 1 Lit

Hence Chlorine gas must react to create hydrogen chloride gas, which requires a reaction volume of 2 L.

provide the same amount of 2 Liter

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The rate constant increase by the factor of 4 when temperature is increased from 25C to 37C and activation energy is 85.6KJ. This can be solved using Arrhenius equation.

What is Arrhenius equation?

Arrhenius equation explains the relation between temperature and rate of the reaction for many chemical and physical reactions. It is given by,

k = A x e^(-Ea/RT)

where k = rate of the reaction, Ea = activation energy, R = gas constant, T = temperature.

The increase in the rate of the reaction can be calculated by Arrhenius reaction when the 2 different temperatures are given.

log k2/k1 = Ea / 2.303R [T2-T1 / T2T1] = 85.6 / 2.303 x 8.314 [ 310 - 298 / 310 x 298] = 4.

Therefore, by using Arrhenius equation, the increase in the rate of the reaction when the temperature increased from 25C to 37C is by a factor of 4.

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Answer:

draw conclusions and analyze results

Chemists employ the mole, a very significant unit of measurement. The initial SO3 concentration is 0.28 M.

A mole is defined as 6.02214076 1023 of a particular chemical unit, such as atoms, molecules, ions, or others. Because there are so many atoms, molecules, or other components in any compound, the mole is a useful quantity to utilize.

When an element's standard relative atomic mass is multiplied by the molar mass constant, 1 103 kg/mol = 1 g/mol, the result is the molar mass of its atoms.

An object's mass that comprises 6.023 x 1023 of that object's particles is referred to as a mole. The SI unit used to measure substance amounts is the mole. Molecule is its symbol. According to the definition, 1 mole of carbon-12 weighs 12 grams and has a carbon atom count of 6.022140857 x 1023.

2.50 L is the container's volume.

Initially, there were 0.700 moles.

first concentration of SO3 =0.700 moles /2.50 L

SO3 = 0.28 M

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The best description of the relationship between emerging scientific ideas and open-mindedness is: Open-mindedness often leads to emerging scientific ideas.

The correct answer choice is option b

It follows that scientific skills emanate faster when a scientist is very open-minded and open to corrections as well. The simple reason why our open-mindedness often results in emerging scientific ideas is simply because it is one of the major keys to investigating scientific problems.

In conclusion, it can be deduced when when we work with transparency, our scientific skills brings positive results.

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The total outer atoms present in a molecule with planar shape are four and total lone pairs are 2.

Square planar shape is formed when there are four bonds and two lone pairs on the central atom.

The four atoms that are attached to the central atom are known as the four outer atoms. These atoms are arranged in such a way that it makes the square shape. The outer atoms are not always fours. They can be 2,3 or four.

The lone pairs are present on the central atom.

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Answer: B

Explanation:

B is the correct answer, but this is only because there is no other data to go off of to answer said question. It says "Other potentially dangerous asteroids" meaning that is what they intend to do.

The reflux of the micro-scale reaction should be gentle because since solvents are present in small quantities, the reaction might dry up and burn.

What is reflux?

Reflux can be analogous to distillation. The condenser is present in reflux. The solvent boils and gets condensed back to the same flask. The equipment for reflux are RB flask, heat source, condenser and a water bath.

In reflux reactions, the micro-scale reactions use very small amount of solvents and reagents as the name suggests. During the reaction some solvent might boil and leave the reaction vessel. Then the solvent molecules condense below. Higher the condensation ring, lesser solvent present in the reaction.

Therefore, during reflux reactions, the reaction might dry up and burn since the solvent condenses and only few molecules of solvent are present in the reaction mixture. So, the reaction needs to be gently done.

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The actual yield is 9.9, which is 92 percent of the theoretical yield of 10.7. As a result, since the reaction only produces 92 gas because it is only 92 percent efficient, obtain 9.9 gas of the product instead of 10.7 milligrams.

You can increase your body's natural release of nitric oxide by eating a diet rich in nitrate-rich foods and antioxidants, taking supplements like L-arginine or L-citrulline, or both. Other effective methods include reducing mouthwash use and engaging in regular exercise.

Methemoglobinemia can be quickly and powerfully induced by nitric oxide. In addition to pulmonary edema, pneumothorax, bronchitis, bronchial asthma, emphysema, and perhaps methemoglobinemia, radiation to nitrogen oxides can alter the pulmonary system. After some time, a cough, hyperpnea, and distress may be observed.

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The Equilibrium concentrations :

[XY]  = 0.268 M

[X] = 0.232 M

[Y]  = 0.232 M

Solution:

XY  ⇔ X + Y

0.2 + x                        0.3-x      0.3 - x

Kc  = [X][Y]/[XY]

0.200  = (0.3-x)^2 / 0.2 + x

0.04  + 0.2 x = 0.09  + x^2 - 0.6 x

x^2   - 0.8 x + 0.05 = 0

x   = 0.732  or x = 0.0683

Equilibrium concentrations :

[XY]  = 0.268 M

[X] = 0.232 M

[Y]  = 0.232 M

When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate. A chemical is said to have equilibrium concentrations when the products and reactants do not change with time.

In other words, chemical equilibrium or equilibrium concentration is the state in which the rate of the forward reaction in a chemical reaction equals the rate of the reverse reaction. Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All extract and product concentrations are constant at equilibrium.

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1s²2s²2p⁷3s²3p⁴ two of the following electronic configurations (in quantum mechanical notation) are not reasonable.

The correct option is B.

Using subshell labels, the electronic structure of an atom is described. These labels include the subshell name, which is determined by the azimuth and elevation quantum number, the shell number, which is determined by the main quantum number, and the total quantity of electrons in the subshell, which is indicated in superscript.

An atom's electron configuration describes how its electrons are dispersed across its orbits (shells) and subshells. An atom's electron configuration is crucial because it aids in predicting a substance's chemical, physiological, electrical, and magnetic characteristics.

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The component of colloid solutions that is helpful in managing hypovolemic shock through the intravenous route is option 3 Starches.

A colloid is an aggregate wherein one substance inclusive of microscopically dispersed insoluble debris is suspended throughout another substance. some definitions specify that the debris needs to be dispersed in a liquid, even as others expand the definition to encompass substances like aerosols and gels.

Colloids and crystalloids are two types of solutions used to replace lost blood fluid (plasma). They encompass blood and artificial products. each colloid and crystalloids seem like in addition powerful at resuscitation. There are one-of-a-kind varieties of colloids and those may have exceptional consequences.

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Disclaimer:- your question is incomplete, please see below for the complete question.

what is the component of colloid solutions that is helpful in managing hypovolemic shock through the intravenous route?

1. Salts

2. Sugars

3. Starches

4. Minerals

Initially, the Flack is the flask filled with water and weighed to find may of water + flask Afla that the Flask is empty flack in noted. emptied and mars ofMass of water in the beaker. calculated by is mars of the flask from. subtracting from this volume of a mass of water + flask.

Flask is calculated using the standard density of water at that ten pleasure. If the flask is not a day from outside at that time, the mass of water will be More than the actual. This results. the higher calculated volume of the flask. As Molar mass. M- MRT PV mass of volatile where Mina's liquid.

Analysis of total nitrogen in organic matrices can be performed using the Dumas method. This ensures the complete combustion of the matrix under oxygen. The resulting gas is reduced with copper and dried with CO2 trapped. Next, quantify nitrogen using a universal detector. Use a thin glass flask with a long neck.

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The percent by mass of carbon in the chemical is 30.20%.

Solution:

Molar mass of C4H8SCl2 = (4×12.01) + ( 8 ×1.0078) + (1×32.065) + ( 2×35.45) = 48.04 + 8.0624 + 32.065 + 70.9 = 159.0674 g/mol

% of Carbon = = Mass of carbon ÷ Mass of the compound)×100 Mass carbon = 4 × 12.01 g/mol = 48.04 g/mol Mass of compound = 159.0674 g/mol

% of Carbon = ( 48.04 ÷ 159.0674 ) × 100 = 0.30201 × 100 = 30.20%.

Sulfur mustard is a type of chemical weapon. These drugs cause blisters on the skin and mucous membranes on contact. They are called vesicants or bubblers. Sulfur mustard is also known as mustard gas or mustard agent under the H, HD, and HT military designations. Sulfur mustard is commonly known as mustard gas.

The name mustard gas was first used when the chemical was sprayed during World War I attacks. Sulfur mustard is not related to mustard, but when mixed with other chemicals It got its name from its yellow color and mustard smell.

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The function of propylene glycol and methyl oleate in a hand cream is as a thickening agent and as an emulsifier and skin softener used in cosmetics.

Propylene Glycol

Propylene glycol is a petroleum derivative product that has no odor and is colorless. This product is one of the products used as a raw material for making cosmetics. The function of propylene glycol is as a thickener for cosmetics such as facial moisturizers, facial cleansers, and other cosmetics that are liquid.

Methyl Oleate

Methyl Oleate is a long-chain saturated fatty acid found naturally in various animal and plant fats. Methyl oleate is solid and white in color, and has a mild aroma and is sometimes crystalline. The content contained in this product is often used as raw material for cosmetic products. The function of methyl oleate is as an emulsifier and lubricant that can soften the skin, and help keep cosmetic products from separating. One important function of methyl oleate in cosmetic products is to create a moist, slippery and unbreakable texture.

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If Ka1 and Ka2 are sufficiently distinct and a polyprotic acid is titrated with a strong base, the pH curve will contain two equivalence points because the two acidic protons will be titrated sequentially.

Titration is a method of chemical analysis in which the amount of a sample's constituents is determined by adding a precise amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—to the sample being tested.

The titrating reagent, or titrant, is gradually added to the process using a standard solution (i.e., a solution of known concentration), which is administered using a burette, which is essentially a long, graduated measurement tube with a stopcock and a delivery tube at its bottom end. The addition comes to an end at the comparable point.

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Viscosity of polystyrene is determined to know the size of polystyrene its compression, and molding capacity.

To obtain the perfect shape and size the configuration of polystyrene should be maintained under different conditions.

So, to deduce the confirmation of the polystyrene under viscosity determination  we can apply 2 methods;

1. By adding excess diluents to the polystyrene which reduces its viscosity.

2. By introducing or adding small linear chains by addition method to the molecular chains of polystyrene molecular structure to reduce chain entanglement.

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At this point, helium is exerting 1270 torr of pressure against its container.

Boyle's Law, a cornerstone of chemistry, describes the behavior of a gas sustained at a constant temperature. Robert A. Boyle discovered this law in 1662: at a certain temperature, the volume of a gas is inversely proportional to the pressure it exerts. To put it another way, if a gas is driven into a closed place, it will condense to fit the area but raise the pressure on the container.

Boyle's law, which is arguably a clearer way to put it, is the relationship between pressure and volume. Mathematically, Boyle's law can be written as pV=k, where p stands for the pressure, volume, and mass of the gas and k is a constant.

The solution is straightforward when temperature and moles are constant,

P₁V₁ = P₂V₂

Given,

P₁ = 760 torr

P₂ = ?

V₁ = 5.00 I

V₂ = 3.00 I

(760)(5.00) = (3.00)(P₂),

P2 = 1270 torr.

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The total entropy change is 1.036 JK/K

Entropy means the unavailable energy associated with the system. The entropy generation for the reversible cycle is zero and for irreversible cycle, it is positive. We can also understand entropy to be randomness of a system, Randomness is maximum in gaseous state and least in solid state.

The given data; the amount of heat transferred by the thermal reservoir is Q = 100KJ. Temperature of the high thermal reservoir is [tex]T_{h}[/tex] = 1150k.

The temperature of the low thermal reservoir is [tex]T_l[/tex] = 600K.

[tex]d_{s}[/tex] = -Q + Q

        [tex]T_{h}[/tex]   [tex]T_{l}[/tex]

Substituting the formula we get

[tex]d_{s}[/tex] = - 100KJ   +  1OOKJ

        1150K         600K

= 1.036 KJ/K

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Metals will tend to form ions that are larger than their parent atom.

Do metals become smaller or larger when they become ions?

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Answer:

4

Explanation: