Convert 2.8 pounds to kg

Answer:

E. glycogenolysis

Explanation:

Glycogenolysis is the process whereby excess glucose stored by the body in the form of glycogen is then converted back/broken down into glucose molecules to serve as a source of energy

Glucagon secretion is stimulated when blood glucose concentration decreases and is secreted by the pancreas. The liver then converts the glycogen into glucose for use by the body

Answer:

NaBr

Explanation:

When AgBr is dissolved in water, the following equilibrium is set up in solution;

AgBr(s)⇄Ag^+(aq) + Br^- (aq)

If we dissolve NaBr in the water, a common ion (Br^-) is now introduced into the system. This increases the concentration of Br^- and favours the reverse reaction hence more AgBr is precipitated. This is known as common ion effect.

The amount of protons in the nucleus multiplied by the atomic number of an atom results in a constant value.

a fundamental unit of matter that shares the same structure as the hydrogen atom's nucleus, makes up all other atomic nuclei together with the neutron, has a mass of 1.673 1027 kilograms, and carries a positive charge that is numerically equal to the charge of an electron.

Two up quarks as well as a down quark combine to form protons. One up quark with two down quarks make up neutrons. The nucleus is kept together by one of the four basic forces known as the "strong nuclear force."

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Answer:

Cl2,Ne, CCl4

Explanation:

Dispersion forces are quite significant as the predominant intermolecular forces in nonpolar substances. For Cl2,Ne and CCl4, dispersion forces are the primary kind of intermolecular interaction present in the compound.

Hence, the boiling point of these substances will be determined solely by the dispersion forces between the molecules.

Cl2, Ne, CCl4 are the group of substances in which dispersion forces would

help determine the boiling point.

Dispersion force  is a type of Van der waals force and is also regarded as

London forces. This type of force occur between the atoms and molecules

when electrons are symmetrically distributed in the nucleus.

This force is a weak intermolecular force and is present in non polar

compounds such as Cl2, Ne, CCl4 . KNO2 is polar and hence doesn't

determine its boiling point.

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Answer:

Mass

Explanation:

Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). Volume measures the amount of space that a substance or an object takes up.

The amount of matter in an object is given in terms of it's mass.

Mass is defined as the combination of physical properties of an object  and the resistance which object undergoes when force is applied to it.It contains total number of protons,electrons and neutrons present in the atom of an object.

Mass does not change according to location but weight does change according to location as the amount of gravity varies from one location to another.Mass can be measured using any kind of balance but weight is measured by using spring balance only.

The SI unit of mass is kilograms.Weight is defined as force exerted on an object due to the gravitational force.Weight and mass are directly proportional to each other.Their relation is based on Newton's second law of motion .Formula of weight is

                    w=m×g

where, w=weight of object

m=mass of an object

g=gravity acting on the object

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Answer:

Option A) CO(g) + 1/2O2(g) <=> CO2(g).

Explanation:

A background knowledge of reaction rates shows that pressure will only affect gaseous reactant.

Further more, we understood that for pressure to effectively affect gaseous molecules, the total volume of the gaseous reactant must be different from the total volume of the gaseous products.

Now, let us consider the equation given in the question:

A) CO(g) + 1/2O2(g) <=> CO2(g).

B) CaCO3(s) <=> CaO(s) + CO2(g).

C) 2H2(g) + O2(g) <=> 2H2O(l).

D) 2Hg(l) + O2(g) <=> 2HgO(s).

E) CO2(g) + H2(g) <=> CO(g) + H2O(g).

From the above, only option A and E has gaseous reactant and product.

For option A:

CO(g) + 1/2O2(g) <=> CO2(g).

Total volume of reactant = 1 + 1/2 = 3/2 L

Total volume of product = 1 L

Since the volume of the reactant and that of the product are different, therefore, a change in pressure will affect the reaction.

For option E:

CO2(g) + H2(g) <=> CO(g) + H2O(g).

Total volume of reactant = 1 + 1 = 2 L

Total volume of product = 1 + 1 = 2 L

Since the volume of the reactant and that of the product are the same, therefore, a change in pressure will have no effect in the reaction.

The equilibrium equation, CO2(g) + H2(g) ⇄ CO(g) + H2O(g), is not affected by pressure changes at constant temperature because there are equal volumes of reactants and products on both sides of reaction equation.

For a gas phase reaction, changes in pressure would affect the direction in which the reaction moves. When the pressure is increased, the reaction moves in the direction of lesser volumes. When the pressure is decreased, the reaction moves in the direction of greater volumes.

For the reaction; CO2(g) + H2(g) ⇄ CO(g) + H2O(g), there are equal volumes of reactants and products on either side of the reaction equation. Therefore, the equilibria would not be affected by pressure changes at constant temperature.

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Answer:

Ionized molecules will be found in the aqueous layer

Explanation:

The principle of solvent extraction involves the partitioning of a substance between an aqueous layer and an organic layer. The aqueous layer is polar in nature while the organic layer is nonpolar in nature.

All nonpolar substances are found in the organic layer while all polar substances are found in the aqueous layer. Hence, in the aqueous phase, the following species can be found; positive ions, negative ions and neutral polar molecules or ionic substances.

Answer:

Its concentration remains constant

Explanation:

The concentration of a pure solid is left out of the expression for the equilibrium solubility of a salt because the concentration of a pure solid remains constant. Therefore, the activity of a pure solid is 1.

Being of a constant concentration, the pure solid is not included in equilibrium expression for the solubility of a salt.

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number

(Z). The number of electrons in a neutral atom is equal to the number of protons .

The mass number of the atom (M) is equal to the sum of the number of protons

and neutrons in the nucleus.

Answer:

13.2 g of gold

Explanation:

We'll begin by converting 5.25 L to ft³.

This can be obtained as follow:

Recall:

1 L = 0.0353 ft³

Therefore,

5.25 L = 5.25 × 0.0353

5.25 L = 1.85×10¯¹ ft³

From the question given above,

2.45 g of gold is present in 5.25 L ( i.e 1.85×10¯¹ ft³) of soil.

Therefore, Xg of gold will be present in 1 ft³ of soil i.e

Xg of gold = 2.45/1.85×10¯¹

Xg of gold = 13.2 g

Therefore, 13.2 g of gold is present in 1 ft³ of the soil.

Answer:

[tex]\mathbf{E_1 = -40.8 \ eV}[/tex]

[tex]\mathbf{E_2= -10.2 \ eV}[/tex]

[tex]\mathbf{E_3=-4.533 \e V}[/tex]

Explanation:

In an  hydrogen like atoms, the formula related to the  energy of an  nth quantum number is:

[tex]E_n =\dfrac{ -13.6 \times Z}{n^2}[/tex]

where;

lithium Z = 3

therefore,  the energy levels for Li²⁺ are

n=1 , n=2, n= 3

[tex]E_1 =\dfrac{ -13.6 \times 3}{1^2}[/tex]

[tex]E_1 = -13.6 \times 3[/tex]

[tex]\mathbf{E_1 = -40.8 \ eV}[/tex]

[tex]E_2=\dfrac{ -13.6 \times 3}{2^2}[/tex]

[tex]E_2=\dfrac{ -13.6 \times 3}{4}[/tex]

[tex]\mathbf{E_2= -10.2 \ eV}[/tex]

[tex]E_3=\dfrac{ -13.6 \times 3}{3^2}[/tex]

[tex]E_3=\dfrac{ -13.6 \times 3}{9}[/tex]

[tex]\mathbf{E_3=-4.533 \e V}[/tex]

Answer:

Kc for this equilibrium is 2.30*10⁻⁶

Explanation:

Equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction and the concentrations of reactants and products are held constant.

Being:

aA + bB ⇔ cC + dD

the equilibrium constant Kc is defined as:

[tex]Kc=\frac{[C]^{c}*[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]

In other words, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients. Kc is constant for a given temperature, that is to say that as the reaction temperature varies, its value varies.

In this case, being:

2 NH₃(g) ⇔ N₂(g) + 3 H₂(g)

the equilibrium constant Kc is:

[tex]Kc=\frac{[N_{2} ]*[H_{2} ]^{3} }{[NH_{3} ]^{2} }[/tex]

Being:

and replacing:

[tex]Kc=\frac{0.0551*0.0183^{3} }{0.383^{2} }[/tex]

you get:

Kc= 2.30*10⁻⁶

Kc for this equilibrium is 2.30*10⁻⁶

Answer:

Protein

Explanation:

Answer:

Water, fat, proteins, lactose, and minerals. Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids, and gases.

Answer: CH3COO- & CH3COOH are conjugate

NH2- & NH3 are conjugate

Explanation:

Answer:

(a) Enantiomers

(b) Diastereomers

Explanation:

In the first pair of molecules, we have an opposite configuration. That is, in the first molecule we have an R and S configuration and in the second an S and R configuration. Therefore we have a mirror image, if this is true, we will have a mirror image and we will have "enantiomers". (See figure 1)

In the second pair of molecules, we do not have a mirror image. Since the first molecule has an R, S configuration (the mirror image would be S, R). In the second molecule, we have an R, R configuration (the mirror image would be S, S). Therefore, the relationship between these molecules is "diastereoisomers". (See figure 2)

Answer:

See explanation

Explanation:

The degree of movement of molecules in each not the three different states of matter depends on the arrangement of the molecules.

In a solid, molecules are packed closely together and are held in fixed positions by strong intermolecular forces such that they can only vibrate or rotate about a fixed point.

In liquids, molecules are less closely packed hence they can flow around each other but possess only little kinetic energy. Intermolecular forces in liquids are much lesser than that of solids.

In gases, intermolecular forces are negligible and gas molecules move with a very high velocity and possess high kinetic energy. There are large spaces between gas molecules and they are always in motion.

Answer:

4.5 multiplied by 10, to the -10th power.

[tex](4.5 \times 10 { - }^{10} )[/tex]

Answer:

the concentration of the nucleophile

Explanation:

In an SN1 mechanism, the rate determining step is the formation of the carbocation. The nucleophile does not appear in the rate equation because the rate determining step is unimolecular and entirely depends on the concentration of the alkyl halide.

Hence, the concentration of the nucleophile has no effect on the rate of an SN1 reaction because the rate determining step involves only the alkyl halide.

The factor which has no effect on the rate of SN¹ reaction is the concentration of the nucleophile.

SN¹ reaction is known as unimolecular nucleophilic reaction, which is completed in two steps.

First step in the SN¹ reaction is the rate determining step i.e. that step determines the rate of reaction. And in this step formation of carbocation takes place because of the loss of leaving group from the reactant. So, rate of reaction is not depends on the concentration of attacking nucleophile.

Hence, option (d) is correct.

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Answer:

H2O- hydrogen bonding

CaCl2- ion-ion interaction

CH3CH(CH3)OH- hydrogen bonding

CH4- dispersion forces

NH3- hydrogen bonding

Explanation:

Intermolecular forces are secondary bond forces that hold the molecules of a substance together in a given state of matter.

Intermolecular forces account for quite a number of the observed physical properties of a substance such as the boiling and melting point.

If a compound contains hydrogen atom bonded to a highly electronegative element, hydrogen bonding becomes the most dominant intermolecular force, e.g in water and ammonia.

For nonpolar molecules, dispersion forces are the most dominant intermolecular forces. In ionic substance, ion-ion interaction becomes quite prominent.

Answer:

The answer would be 75,416 feet / minute.

And the conversion would be: 857 miles / 1 h = (1h / 60 minutes) (5280 feet / 1 mile)

Explanation:

Conversion factors are mathematical operations used to make unit changes of the same magnitude, in magnitudes of weight, time, or length. etc.

It consists of multiplying one or more fractions several times in which the numerator and the denominator are equal quantities expressed in different ways.

For example: 1 hour = 60 minutes = 3600 seconds.

857 miles / 1 hr = (1h / 60 minutes) (5280 feet / 1 mile)

Answer:

C. 4 × 6.02 × 10²³ potassium atoms.

Explanation:

In 1.00 mol of potassium zirconium sulfate trihydrate, K₄Zr(SO₄)₄.3 H₂O, there are

A . 3 × 6.02 × 10²³ hydrogen atoms. NO. There are 3 × 2 moles of hydrogen atoms = 6 moles of hydrogen atoms = 6 × 6.02 x 10²³ hydrogen atoms

B. 6.02 × 10²³ sulfur atoms. NO. There are 4 moles of sulfur atoms = 4 × 6.02 × 10²³ sulfur atoms

C. 4 × 6.02 × 10²³ potassium atoms. YES. There are 4 moles of potassium atoms =  4 × 6.02 × 10²³ potassium atoms

D . 4 moles of oxygen atoms. NO. There are 4 × 4 moles of oxygen atoms = 16 moles of oxygen atoms

E . 4 moles of zirconium atoms NO. There is 1 mole of zirconium atoms

Answer:

Sum.

Explanation:

Hello,

In this case, the Dalton's law states that the SUM of the partial pressures of each gas in a mixture must equal the total pressure of the entire gas mixture, considering its mathematical definition for a i-containing gas mixture:

[tex]P_t=P_1+P_2+...+P_i[/tex]

Regards.

Answer:

a) volume₁ = 444.6 L  

b) Volume₂ = 306 L  and percentage Error = 31.2%

Explanation:      

Given that;

the solution contains 35.0 wt% H₂SO₄

A quantity of the 35% solution is needed that contains 195.5 kg of H₂SO₄

Lets say mass of solution containing 195.5 kg H₂SO₄ is 'A' kg

Now since the question saysm it is a 35% wt solution,

so

(35/ 100) × Akg = 195.5kg

0.35A = 195.5

A = 558.6kg

So A = 558.6 kg

therefore mass of the  solution is 558.6kg

a)

also Specific gravity is 1.2563

since density of water = 1kg/ L

density of solution = SG of H₂SO₄ × density of water

therefore density of solution = 1.2563 ×1kg/ L  = 1.2563 kg/ L

Now to calculate the required volume (L) of the solution

we say;

Volume of solution = mass / density

Volume = 558.6kg / 1.2563kg/L

Volume₁ = 444.6 L  

b)

Now If pure-component specific gravity is to be used,

Specific Gravity = 1.8255

which means Density will be  = 1.8255 kg/ L

Therefore will be

Volume = 558.6kg / 1.8255kg/L

Volume₂ = 306 L

To calculate the error

we say volume₁ - volume₂

Error = 444.6L - 306L = 138.6

So

Percent error = ( 138.6L / 444.6L) × 100

percentage Error = 31.2%

Answer:

Below

Explanation:

Combination of Calcium(Ca) and Chlorine(Cl); Calcium chloride

[tex]Ca+Cl_2 -> CaCl_2[/tex]

Combination of Sodium(Na) and Chlorine(Cl); Sodium chloride(salt)

[tex]Na+Cl_2 -> NaCl[/tex]

Combination of Hydrogen(H) and Oxygen(O);(water)

[tex]H_2 +O_2-> H_2O[/tex]

Combination of Potassium (K) and Fluorine(f) ; Potassium fluoride

[tex]K+F ->KF[/tex]

Answer:

[tex]pH=2.88[/tex]

Explanation:

Hello,

In this case, since dissociation of acetic acid is:

[tex]CH_3COOH\rightleftharpoons CH_3COO^-+H^+[/tex]

The equilibrium expression in terms of the acid dissociation constant is:

[tex]Ka=\frac{[CH_3COO^-][H^+]}{[CH_3COOH]}[/tex]

In such a way, in terms of the reaction extent, we write:

[tex]Ka=\frac{x*x}{0.1-x}[/tex]

And Ka is computed from the pKa:

[tex]Ka=10^{-pKa}=10^{-4.75}=1.78x10^{-5}[/tex]

[tex]1.78x10^{-5}=\frac{x*x}{0.1-x}[/tex]

Thus, solving for [tex]x[/tex] we obtain:

[tex]x=0.001325M[/tex]

Which is also equal to the concentration of H⁺ so the pH is:

[tex]pH=-log(0.001325)\\\\pH=2.88[/tex]

Regards.

Answer:

Power, [tex]P=1.176\times 10^9\ W[/tex]

No of bulbs = 78400000

Explanation:

We have,

Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, it mean it is mass per unit time i.e. m/t.

It falls from a height of 50 m

The gravitational potential energy of falling water is given by :

P = mgh

Power is equal to the work done divided by time taken. So,

[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{m}{t}\times gh[/tex]

So,

[tex]P=2400000\times 9.8\times 50\\\\P=1.176\times 10^9\ W[/tex]

Let there are n bulbs that could power 15 W LED. It can be calculated by dividing the power by 15. So,

[tex]n=\dfrac{1.176\times 10^9}{15}\\\\n=78400000\ \text{bulbs}[/tex]

It means that the number of bulbs are 78400000.

Answer:

Option (B) 7

Explanation:

C3H6O2(l) + O2(g) → CO2(g) + H2O(l)

To know the coefficient of O2 in the above equation, let us balance the equation.

The above equation can be balance as follow:

C3H6O2(l) + O2(g) → CO2(g) + H2O(l)

There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 3 in front of CO2 as shown below:

C3H6O2(l) + O2(g) → 3CO2(g) + H2O(l)

There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2O as shown below:

C3H6O2(l) + O2(g) → 3CO2(g) + 3H2O(l)

There are a total of 4 atoms of O on the left side and a total of 9 atoms on the right side. It can be balance by putting 7/2 in front of O2 as show below:

C3H6O2(l) + 7/2O2(g) → 3CO2(g) + 3H2O(l)

Multiply through by 2

2C3H6O2(l) + 7O2(g) → 6CO2(g) + 6H2O(l)

Now, the equation is balanced.

From the balanced equation above, the coefficient of O2 is 7.

Answer:

60% and 52%

Explanation:

At Standard temperature and volume (STP)

Volume of gas = 22.4L

Density = mass/volume

⇒ 1.186 = [tex]\frac{mass}{22.4}[/tex]

= 26.566g

Molar mass of O2 = 16g/mole

Molar mass of N2 = 14g/mol

% mass of O2 = 16/26.566 × 100

= 60.23 %

% mass of N2 = 14/26.566 × 100

= 52.70 %

(Check: totl composition of gas is 100% i.e 60 + 52 %)

Answer:

Should the government invest more money in nuclear energy than

in solar energy

Explanation:

This is because some people might think government should invest in nuclear energy while others might want the government to invest in solar energy.

Answer:

B. "Should the government..."; the answer to this relies on subjective input (what the audience thinks the government should do).

Explanation:

Think about the differences between statements that are subjective and objective. If you look at A, C, or D, these results of these experiments are all objective:

A) The amount of electricity generated by a power plant isn't "arguable"; it's a definite value that I can't just "make up" or "think" is correct/valid.

C) The byproducts generated by manufacture aren't "arguable" either; if a byproduct is heat, there's no subjective input.

D) Try to use the above reasoning for D!

Answer: A

Explanation: The other options are opinions and can vary in the way that people respond

The valid piece of scientific evidence among the options provided is:

a. The amount of snow pack in the mountains

Scientific evidence refers to observations or data that can be objectively measured, tested, and analyzed. The amount of snow pack in the mountains can be quantitatively measured and observed, making it a valid piece of scientific evidence. It can be used to study climate patterns, water availability, and various other scientific phenomena related to snow and mountain ecosystems.

The other options, b. The way a piece of music makes you feel, c. How many people like brownies more than cake, and d. The color blue being called a calming color, involve subjective experiences, personal preferences, and cultural associations rather than empirical observations that can be tested and measured in a scientific context.

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