Hexane is more likely to dissolve in octane rather than ethanol.
A. true
B. false

Answer:

(0,1)

Explanation:

Endpoints (-3, 7) and (3,-5)

The midpoints will be the average of the x and y coordinates:

Midpoint for x = (-3+3)/2 = 0

Midpoint for y = (7-5)/2 = 1

(0,1)

the heat of the water

Explanation:

water heat boils and starts to mske water vapor.

The radioactive half-life of a material is the time for both of these. Option C.

The half-life of a radioisotope is the time it takes for half of the radioisotope to decay. Certain radioisotopes have a constant half-life. It is unaffected by conditions and is independent of the initial amount of its isotope. Half-life is the time it takes for half of the radioactive atoms of a particular radionuclide to decay.

As a rule of thumb after 7 half-lives, the radiation dose is less than 1% of the original dose. The half-life is then determined from the basic definition of radioactivity as the product of the decay constant λ of the radionuclide and the number of radioactive atoms N present. Half-life is defined as The time required for half of an existing radioactive nucleus to decay. That's what it means to have a short half-life. Activity declines rapidly because many nuclei decay in a short time.

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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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When 42 grams of potassium chloride (kcl) are dissolved in 3.6 kilogram of water, the resulting solution has a molality of 0.156 m.

The term "molal concentration" is another word for molality. It measures the solute concentration in a solution. There are a variety of terminology that can be used to describe a solution's concentration, including molarity, molality, normality, formality, volume percentage, weight percentage, and parts per million. The term must determine the molecular weight of the solute and the mass of the solvent.

Molality is the best method for transferring concentration since the mass of the solute and solvent in the solution is constant.

Molality = moles of solute/ liters of solution

Moles of KCl = (42g KCl) x (1 mole KCl/74.5513 g) = 0.5633 moles KCl

Water in kg = 3.6 kg

m = 0.5633/3.6

m = 0.156

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Explanation:

for reactions to occur, the reactants must've reach a certain amount of energy for collisions to occur. hence, if a reaction has a lower activation energy, this energy can be reached sooner therefore, reaction would occur faster.

the formulas of the compounds that correspond to the names carbon tetrabromide cobalt(ii) CBr4 co(ii), calcium nitrate Ca(NO3)2(H2O)x.

Tetrabromoethane, commonly called carbon tetrabromide or CBr4, is a kind of carbon tetrabromide. It is used as a sedative, an intermediate in the production of agrochemicals, a solvent for greases, waxes, and oils, and in the blowing and vulcanization processes in the plastic and rubber industries. It is a component of compounds that are fire-resistant since it is not flammable. Because of its high density, it is also employed in the separation of minerals. An inorganic substance having the formula Ca(NO3)2(H2O)x is calcium nitrate, popularly known as norgessalpeter (Norwegian Salpeter). The infrequently encountered anhydrous chemical turns into the tetrahydrate by absorbing moisture from the atmosphere. Salts come in both colorless anhydrous and hydrated forms. There are other uses for calcium nitrate besides being a component of fertilizers.

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The melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

What is melting point?

Melting point is the temperature at which substance changes state from solid to liquid. Different solids have different melting points. This depends on the pressure which is usually taken as standard pressure that is 1 atmosphere or 100kPa.

The melting point for the given solution can be calculated as,

Number moles of ethylene glycol is calculated as,

n = m / M = 130 g / 62 gmol^-1 = 2.096 mol.

m is mass, M is molecular mass.

Then the molality of the solution is calculated,

Molality = n / mass of solvent in Kg = 2.096 mol / 1 kg = 2.096 mol/kg

The Kf of ethylene glycol = -3.11

Melting point = Kf x molality = -3.11 x 2.096 = -6.518C.

Therefore, the melting point of a solution that is formed when 130 g of ethylene glycol (C2H6O2) dissolved in 1.00 kg of water is -6.518C.

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The approximate degree of dissociation is 4.45%.

Degree of dissociation:

The degree of dissociation is the phenomenon of generating current-carrying free ions, which are dissociated from the fraction of solute at a given concentration.

The degree of dissociation is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.

The formula for degree of dissociation:

α λ λ α λ λ α = λ c λ 0

where λ λ λ c is the molar conductivity of weak electrolyte at “C” (concentration)

λ λ λ 0 is the molar conductivity of weak electrolyte at "0".

Ka = C∝²

∝ = [tex]\sqrt{\frac{Ka}{C} }[/tex]

Ka = [tex]10^{-3.08}[/tex] = 8.32×[tex]10^{-4}[/tex]

C = 0.42

Putting these values in the equation we have:

∝ = [tex]\sqrt{\frac{8.32 * 10^{-4} }{0.42} }[/tex]

   = 4.449 ×[tex]10^{-2}[/tex]

   = 0.04449

The degree of dissociation is 4.45%

Therefore the degree of dissociation is 4.45%.

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The volume of distilled water they must add to the initial solution to achieve this lower concentration is 35.5 l.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample = 18.0 m

V₁ = initial volume of sample = 5.00 x 10² ml

C₂ = final concentration after dilution = 0.25 m

V₂ = total final volume after dilution

Plug in the values to the formula and solve for the final volume.

C₁V₁ = C₂V₂

(18.0 m)(5.00 x 10² ml) = (0.25 m)V₂

V₂ = 36000 ml

Subtract the initial volume from the final volume to determine the volume of water needed to add.

V of water = V₂ - V₁

V of water = 36000 ml - 5.00 x 10² ml

V of water = 35500ml = 35.5 l

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At room temperature 15 grams of zinc will occupy 2.10 cm3

What is density of an element?

When atoms occupy a specific volume of space, their mass and number are measured by the periodic table's element densities. The quantity of mass in a particular volume, commonly expressed as grams per cm3 or g/cm3, is the density, which is a measurement of the number of particles in a certain volume of a substance.

Given the mass of zinc is 15 grams.

The density of zinc in room temperature is 7.14 g/cm^3

Density = mass/ volume

Volume =  mass / density

Volume = 15/ 7.14 = 2.10 cm3

Hence, at room temperature 15 grams of zinc will occupy 2.10 cm3.

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If a 10.0 ml sample of this buffer is diluted to 1000 ml with water,the ph of the diluted buffer is 9.26.

pH of Buffer Solution can be calculated as :

pH = pKa  - log ( [ Salt ] / [ Base ] )

Since Kb = 1.8 x 10-5  

then , pKb = 4.74

Since , pKa  +  pKb = 14  \Rightarrow pKa = 9.26

Initial concentration of NH3  and (NH4)+  is 1 M.

Now 10 mL of the sample is taken and diluted to 1000 mL

Since , M1V1 = M2V2

Where M1 is the Molarity of the solution before dilution and V1 is the volume taken  ( M1 = 1 M ; V1 = 10 mL)

M2 is the Molarity of the solution after dilution and V2 ( V2 =1000 mL ) is the Final volume  of the solution.

M2 = M1V1 / V2    \Rightarrow  M2 = ( 1 x 10 ) / 1000 = 0.01 M .

Final concentration of NH3  and (NH4)+  in the sample is 0.01 M.

then , [ Salt ] / [ Base ]  = 1

Since ,   log( 1 ) =0

Then pH = pKa = 9.26

The pH of the Buffer solution is 9.26.

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Boron and beryllium sometimes have less than 8 electrons around them, Sulphur sometimes has more than 8 electrons around it and odd electron species are reactive because of their instability and their examples ate NO, NO₂ and ClO₂.

a. The example of the atoms which sometimes have fewer than 8 electrons around them are Boron and beryllium.

b. The example of the atom with sometimes have more than 8 electrons around them is Sulphur.

c. The odd electrons species generally are very reactive and uncommon because there highly unstable.

To achieve stability the readily reacts with other compounds in order to complete their octet and achieves stability. They are very uncommon because when they are formed, they tend to break the octet rule which is not very frequently observed in the atoms. The example of odd electrons species are NO, NO₂ and ClO₂.

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Both models are useful to describe the reactvity of potassium because each shows an electron in the outermost shell.

Valence electrons can be described as the s and p electrons in the outermost shell while the electrons present in the inner shell are called core electrons.

Valence electrons can be all arranged in different shells and are negatively charged particles. These electrons are responsible for chemical interaction between atoms and the formation of chemical bonds.

Only the electrons present in the outermost shell can contribute in the formation of a chemical bond and decide the reactvity of atom such type of electrons is called valence electrons.

The reactivity in potassium can be seen due to one electron present in the valence shell.

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If the relative molecular mass of CH₂O is 60, the molecular formula of the compound would be  [tex]C_3 H_6O_3[/tex].

The empirical formula of a compound is the formula based on the simplest whole number ratio of the component atoms. The molecular formula could be in multiples of the empirical formula.

The empirical and the molecular formulas of a compound are related by the following equation:

[empirical formula]n = molecular formula

Where n = molecular formula mass/empirical formula mass

In this case, the relative molecular mass is 60. The empirical formula mass can be calculated as:

CH₂O = (12) + (2x1) + (16)

          = 40 g/mol

Thus:

n = 60/40

 = 1.5

Therefore, the molecular formula would be: [CH₂O]1.5 which is equivalent to [tex]C_3 H_6O_3[/tex]. This is because atoms combine in simple whole number ratios.

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Since the density of rubbing alcohol is lower than the density of baby oil, rubbing alcohol will float on top of the baby oil.

The density of a substance is the ratio of the mass of the substance and its volume. It is mathematically expressed as:

Density = mass/volume

It is the property that measures how densely packed the molecules of a substance are.

The density of water is approximately 1 g/mL. Substances whose densities are lower than that of water will float on while those whose densities are higher than that of water will sink in it.

Two immiscible liquid substances will either float over or sink under one another depending on their densities. The liquid with the lower density will float while the one with the higher density will sink.

Thus, if the density of rubbing alchohol is 0.79 g/mL and that of baby oil is 0.83 g/mL, it means that the rubbing alcohol will float over the baby oil.

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The correct answer is 25%. Option A.

Solution:

mass of NaCl (solute) = 50 g

mass of H2O (solvent) = 150 g

Mass of solution = mass of solute + mass of solvent

= (50 + 150) g

= 200 g

Concentration of mass% (m/m) = (mass of solute / mass of solution) x 100 %

= (50/200) x 100 %

= (0.25) x 100 %

= 25.0%

Therefore answer is 25.0% (m/m)

The mass percentage is calculated by dividing the mass of one component by the total mass of the mixture and multiplying by 100%. A mole fraction is a unit of concentration defined as the number of moles of a component divided by the total number of moles in the solution. Solution mass percent is defined as the mass of solute present per 100 grams of solution.

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The picture shows the balancing of chemical equations. The balanced chemical equation of the reaction is:

Balanced chemical equations are equations in which the number of moles of atoms of elements that are reacting is equal to the number of moles of atoms of the elements that are produced.

The balancing of chemical reactions follows the law of conservation of mass which states that matter cannot be created nor destroyed but can change from one form to another.

Hence, in a balanced chemical equation, the mass of the reactants is equal to the sum of the mass of the products.

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Option 4. nutrients (nitrate, phosphate, silica) are non-conservative properties of a deep water mass.

The non-conservative factors like phosphorous (P), iron (Fe), and carbon (C) or dissolved inorganic carbon found in seawater are chemically or biologically reactive. Conservative elements have longer residence instances. that is the purpose these factors make up the majority of the sea's dissolved materials.

Sodium and chloride are nonconservative constituents of seawater. Non-conservative pollutants approach pollutants that are presumed to be destroyed, biodegraded, chemically converted, or volatilized within the POTW to some diploma.

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Answer:

Explanation:

Numerous, controlled studies have demonstrated that people who exercise regularly have greater bone density than those who are more sedentary.

Any type of exercise will stimulate the deposition of more bone tissue, but resistance training has a greater effect than cardiovascular activities.

Hope this helps

1)The bond between silicon and chlorine will be covalent bond.

2) The mass and amount of atoms are same . bonds between atom  will change.

3) the balanced reaction is :

4NO   +   6H₂O    ---->   4NH₃  +   5O₂

1) The valence electron in silicon is 4 and the valance electron in chlorine is 7 . there is not much difference in their electronegativity . so, they do not form ionic bond they will form covalent bond.

2) In a chemical reaction the 2 things that are always same is the amount of atoms and the mass . the one thing that will change is the bonding between the atoms.

3) the reaction is :

NO   +   H₂O    ---->   NH₃  +   O₂

            reactants           products

N                  1                         1

O                  2                       2

H                   2                    3

hydrogen is not balanced . so multipy 3 in H₂O and 2 in   NH₃ and 2 in NO 5/2 in O₂

2NO   +   3H₂O    ---->   2NH₃  +   5/2O₂

now the reaction is balance . to make it whole number multiply thae whole equation with 2, we get:

4NO   +   6H₂O    ---->   4NH₃  +   5O₂

Thus, 1)The bond between silicon and chlorine will be covalent bond.

2) The mass and amount of atoms are same . bonds between atom  will change.

3) the balanced reaction is :

4NO   +   6H₂O    ---->   4NH₃  +   5O₂

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Super saturated solution is a term used to describe a solution that contains more solute than the saturated solution at a particular temperature.

Your solution is referred to as unsaturated if you can continue to add solute while it still dissolves. Your solution is saturated when it can no longer dissolve any more solute at a particular temperature.

A solution that, under the same circumstances, contains more dissolved solute than a saturated solution is said to be supersaturated. The link between temperature and a substance's solubility is displayed by a solubility curve.

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Nucleus 2: ¹⁸₈F

Nucleus 4: ¹⁹₈F

(Isotopic notation are similar as nuclear notation, or the atomic mass, symbol, and atomic number.)

The serine proteases use combination of the given strategies catalysis by approximation, non-covalent, covalent and metal ion

Serine proteases catalyze non-covalent bond is a sort of chemical link, generally between macromolecules, that doesn't entail the exchanging of electron pairs but instead involves more diffused types of electromagnetic interactions. In supermolecular chemistry, non-covalent bonds between supermolecules predominate over other types of bonds. The exchange of one or more pairs of electrons between two atoms forms a covalent connection. The two atomic nuclei are drawing these electrons in unison. When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed.

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The maximum power output of this heat engine is 39,165.75 kJ/min. The result is obtained by using the value of Carnot Efficiency.

The efficiency of a heat engine is generally expressed as

[tex]\eta = \frac{W}{Q_{h}}[/tex]

Where

The Carnot Efficiency is the maximum efficiency of heat engine that is dependent on the temperatures of the hot source (Th) and the cold sink (Tc). The Carnot Efficiency can be expressed as

[tex]\eta = 1 - \frac{T_{c} }{T_{h}}[/tex]

Where

Given the temperature of the hot source at 477°C and the cold sink at 25°C. The heat is supplied at a steady rate of 65,000 kJ/min.

What is maximum power output of this heat engine?

First, we convert temperature unit from Celsius to Kelvin.

[tex]T_{h} = 477 + 273.15 = 750.15 K[/tex]

[tex]T_{c} = 25 + 273.15 = 298.15 K[/tex]

The Carnot Efficiency is

[tex]\eta = 1 - \frac{T_{c} }{T_{h}}[/tex]

[tex]\eta = 1 - \frac{298.15 }{750.15}[/tex]

[tex]\eta = 1 - 0.39745[/tex]

[tex]\eta = 0.60255[/tex]

The power equals work divided by time. By using the value of Carnot efficiency, the maximum power output is

[tex]\eta = \frac{\frac{W}{t} }{\frac{Q_{h}}{t} }[/tex]

[tex]0.60255 = \frac{\frac{W}{t} }{65.000}[/tex]

[tex]\frac{W}{t} = 65.000 \times 0.60255[/tex]

[tex]\frac{W}{t} = 39,165.75 kJ/min[/tex]

Hence, the maximum power output of this heat engine is 39,165.75 kJ/min.

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Move the decimal so there is a non-zero digit to the left of the decimal point. The number of decimals you move will be the exhibitor on the 1010. If the decimal has been moved to the right, the exponent will be negative. If the decimal has been moved to the left, the exponent will be positive.

[tex]1.8 \times 10 { }^{1} [/tex]

Based o the nature of the reactants and products:

A chemical reaction is a reaction that results in changes in the chemical properties of substances.

A chemical reaction results in the formation of new products.

There are several types of chemical reactions such as:

This is illustrated as follows: AB + C ---> AC + B

This is illustrated as follows: AB + CD ---> AC + BD

Hence, two ionic compounds react to produce two iob=nic compounds.

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Answer:

B

Explanation:

Ozone (O3) is a gas which is present naturally within Earth's atmosphere. It is formed of three oxygen atoms (giving it the chemical formula, O3).

Answer:vaporization

Explanation:

A shorter, easier way to show chemical reactions, using symbols instead of words, is called a Chemical equation.

All the elements in chemistry have specific name and properties. Along with this, they all have a particular sign like Na for sodium, Ar for Argon and K for potassium.

Rather than writing the full name in words of the elements, we write only the symbols of the element along with the products and the reactants separated by using a arrow pointing towards products side.

For example,

Chemical reaction: Sodium hydroxide reacts with Hydrogen chloride to form Sodium chloride and water.

Chemical equation: NaOH + HCl → NaCl + H₂O.

So, as we can see from the example, the chemical equation is much more easier to understands and shorter.

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