The _____________________on Earth is constantly changing from one form to another in a ___________________________________that occurs over and over again.

The alkoxide group responsible for the nucleophilic attack on the carbonyl group (more precisely the carbon atom) during peptide bond cleavage in chymotrypsin belongs to the serine 195 side-chain.

Because only serine and threonine of all the amino acids contain hydroxy-groups, only they qualify as possible answers. When we look at the structure of the chymotrypsin, we can see that there is a serine 195, so it must be it. Indeed, during peptide bond cleavage, histidine 57 side-chain deprotonates the serine 195 side chain, turning into a nucleophilic hydroxy-group, which can then attack the carbonyl group, held in place by the glycine 193's residue.

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Gravitational force between the moon and the astronaut change are decrease

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them

We can visualize the effect mathematically via the equation for newton's law of gravitation

Fgrav = Gm₁m₂/r₂

From this relationship, we can see that force Fgrav and square of the distance rare inversely proportional as one increases the other decreases

Therefore, as the distance between the astronaut and earth increases, the magnitude of the gravitational force will decrease

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Answer: 63.6166 amu (atomic mass units)

Explanation: When an element X is written in the form of X-N, N will the atomic mass of that element. So we have copper with a mass of 63 and 65. We are given percentages of each one. 69.17/100 of the copper atoms will be of weight 63 while 30.83/100 will be of weight 65. Keep in mind that amu does not actually mean weight but I'm just using it as a tool to help explain the general concept. Assume you have 100 copper atoms, and you need to find the average atomic mass for them, if you do this you will solve the problem. Due to the fractions, 69.17 of them will be 63 amu and the rest will be 65. So do 69.17*63+65*30.83 and divide by one hundred. By doing this you will get 63.6166. If my answer doesn't make sense, search up how to calculate weighted averages

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vaporization's enthalpy is 40.88 kJ/mol.

The amount of energy (enthalpy) required to turn a portion of a liquid into a gas is known as the enthalpy of vaporization (symbol Hvap), also known as the (latent) heat of vaporization or heat of evaporation.

Enthalpy of vaporization  ∆Hvap

T1 = 25 + 273 = 298 K

T2 = 100 + 273 = 373 K

Cp(1) = 0.07529 kJ/K.mol

Cp(2) = 0.03358 kJ/K.mol

So dHvap at 100 oC would be,

dHvap = dHvap at 25 oC + (Cp(2) - Cp(1)(T2-T1)

= 44.01 + (0.03358 - 0.07529)(373-298)

= 40.88 kJ/mol

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The volume of O₂ produced at STP after 5.0g of KCIO3 is decomposed is 1.317L.

For experimental measurements to be established under standard conditions that allow for comparisons between various sets of data, standard temperature and pressure must be met. The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). STP, or Standard Temperature and Pressure, refers. 2. The STP value of gas temperature, according to IUPAC, is 15 K. 2. According to IUPAC, gas is at 15 K in the STP. VSTP is equal to V* (273.15/T)* (P/760) Kelvins, Torrs, and Liters are used in the STP formula. The number of gas molecules at a standard temperature and pressure, or STP, has been calculated using this law. STP is measured in Kelvin and atmospheres.

39.01 g [tex]mol^{-1}[/tex]  +  35.45 g[tex]mol^{-1}[/tex]   + 3.1600 g[tex]mol^{-1}[/tex]

= 122.46 g[tex]mol^{-1}[/tex]

To get the material's molecular weight, divide the overall mass of the substance by its relative mass.

5g/ 122.46g[tex]mol^{-1}[/tex]  = 0.041mol

There are two moles of KLC[tex]CO_{3}[/tex]  for every 3 moles of [tex]O_{2}[/tex] , that can be seen from the equation. Using the ratio 2:3 and inserting 0.048 mol we find that there must be 0.0612 mol [tex]O_{2}[/tex].

At STP (standard temperature and pressure), a mole of an ideal gas takes up 22.4 liters.

Hence

22.4 l[tex]mol^{-1}[/tex] × 0.0612 mol

= 1.317 L

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Answer:

Breaking the bread

Explanation:

Because you're just breaking the bread into pieces.

Answer:

basic neural acid neural acid basic

The balanced chemical reaction for this process looks like this:
[tex]Pb(NO_{3} )_{2} (aq) + 2 KCl (aq)[/tex] → [tex]PbCl_{2} (s) + 2KNO_{3} (aq)[/tex]
The reaction includes forming a precipitate.

The exact grams of the salts are unnecessary, because the chemical reaction will happen no matter the ratio, and the precipitate formed will not dissolve in excess of either reagent.

Both lead(II) nitrate and potassium chloride are salts that are very soluble in water. However, halogenides of lead (chloride, bromide, iodide) are insoluble in water (solubility decreases from chloride to iodide) and so, upon mixing of the two solution, a precipitate of lead(II) chloride will form. Potassium nitrate remains soluble, as most of potassium salts are very soluble in water.

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The density of the metal cube is  7.874 kg/m³

Density is a word we use to describe how much space an object or substance takes up means its volume in relation to the amount of matter in that object or substance means its mass and another way to put it is that density is the amount of mass per unit of volume and if an object is heavy and compact it has a high density

Here given data is metal cube with a volume = 20 cubic centimeters and mass = 157.48 gram so we have to find density of the metal cube = ?

So, density = mass/volume means ρ = m/V

Density = 157.48 gram/20 cubic centimeters

Density = 7.874 kg/m³

The density of the metal cube is  7.874 kg/m³

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( a ) The pH of 5.9 × [tex]10^{-8}[/tex]  M hydronium-ion concentrations is 7.22 .

( b ) The pH of 3.5 × [tex]10^{-12}[/tex]  M hydronium-ion concentrations is 11.45

( c ) The pH of 7.0 × [tex]10^{-3}[/tex]  M hydronium-ion concentrations is 2.14 .

( d ) The pH of 6.66× [tex]10^{-9}[/tex]  M hydronium-ion concentrations is 8.17

( a )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 5.9 × [tex]10^{-8}[/tex]  M ]

pH = 7.22

Therefore , the pH of 5.9 × [tex]10^{-8}[/tex]  M hydronium-ion concentrations is 7.22 .

( b )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 3.5 × [tex]10^{-12}[/tex]  M ]

pH = 11.45

Therefore , the pH of 3.5 × [tex]10^{-12}[/tex]  M hydronium-ion concentrations is 11.45 .

( c )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 7.0 × [tex]10^{-3}[/tex]  M ]

pH = 2.14

Therefore , the pH of 7.0 × [tex]10^{-3}[/tex]  M hydronium-ion concentrations is 2.14 .

( d )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 6.66× [tex]10^{-9}[/tex]  M ]

pH = 8.17

Therefore , the pH of 6.66× [tex]10^{-9}[/tex]  M hydronium-ion concentrations is 8.17

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i do not know much about that

A reference value is provided by the control, which can then be compared to the samples in which the value of a variable was altered.

This is further explained below.

Generally, Control is a management function that aids in mistake detection and the implementation of remedial measures.

This is done to reduce departure from standards and make that the organization's stated objectives are met in the desired way.

In conclusion, The control offers a standard against which samples with varying changes may be measured.

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The kinetic energy of the liberated electron is 1.73 x 10⁻¹⁹ J.

The total energy of the light is the sum of the kinetic energy of the electron and work function of the metal.

E = K.E + Ф

where;

The total energy of the photons of light is calculated as follows;

E = hf

where;

E = (6.626 x 10⁻³⁴) x (9.62 x 10¹⁴)

E = 6.37 x 10⁻¹⁹ J

1 eV = 1.6 x 10⁻¹⁹ J

E = 6.37 x 10⁻¹⁹ J = 3.98 eV

The kinetic energy of the liberated electron is calculated as;

E = K.E + Ф

K.E = E - Ф

K.E = 3.98 eV - 2.9 eV

K.E = 1.08 eV = 1.73 x 10⁻¹⁹ J

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Ryan calculates that he requires 4 ice cubes for 250mL of hot tea to reach the optimal drinking temperature by using the specific heat capacity of tea.

A substance's potential to hold heat is indicated by its specific heat capacity. This substance size reflects the amount of heat required to raise a certain volume of a material's temperature by one Kelvin. Specific heat capacity is a distinguishing feature of every substance and is useful for material identification.

Given:

Final temperature of system is 57.8℃

dT1 = 79.1 - 57.8 = 21.3℃

dT2 = 0 - (-8.33) = 8.33℃

dT3 = 57.8 - 0 = 57.8℃

Mass of tea, m1 = 250.0mL = 250.0g = 0.250kg

Specific heat capacity of tea, C1 = 4186 J/kg℃ = Specific heat capacity of water

Specific heat capacity of ice, Ci = 2090 J/kg℃

Mass of each ice cubes, m of i = 18.8g

Latent heat of fusion of ice, Lf = 334 kJ/kg

To find:

No. of ice cubes required = ?

Calculations:

Suppose equilibrium temperature is T, then

Heat released by Tea = Heat gained by Ice

Q1 = Q2

m1x C1x dT1 = mi x Ci x dT2 + mi x Lf + mi x Cw x dT3

0.250x 4186 x 21.3 = mi x (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)

mi = 0.250 x 4186 x 21.3 / (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)

mi = 0.0761kg = 76.1g

Mass of ice required = 76.1g

Number of ice cube required will be:

n = Total mass of ice/mass of each ice cube

n = 76.1/18.8

n = 4.04 ice cubes = 4.0 ice cubes

Result:

Ryan requires 4 ice cubes to bring 250mL of hot tea to the optimal drinking temperature.

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Based on the cryoscopic constant and the ebullioscopic constant of benzene, we can calculate that the boiling point of this solution will be 82.33 °C.

For this calculation, we require both the cryoscopic constant (Cf = 5.12 °Ckg/mol) and the ebullioscopic constant (Cb = 2.52 °Ckg/mol) for benzene. These describe the shifts in benzene's freezing and boiling points based on the molality of the solution (with benzene as the solvent).

Because we know that the change in benzene's freezing point is 5.53 °C - 1.00 °C = 4.53 °C, we can now calculate the molality of the solution and use it to calculate the boiling point of the same solution.

Δt(freezing) = m * Cf ⇒ m = Δt / Cf = 4.53 °C / 5.12 °Ckg/mol = 0.885 mol/kg

Δt(boiling) = m * Cb = 0.885 mol/kg * 2.52 °Ckg/mol = 2.23 °C

t (boiling) = 80.10 °C + 2.23 °C = 82.33 °C

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The threat to living things increases with decreasing wavelength. While there are risks associated with longer wavelengths as well, live tissue is easily harmed by very short wavelengths like X-rays and gamma rays.

The DNA within a living cell can be harmed by some types of electromagnetic radiation, which is radiation present in several types of light waves, including ultraviolet light as well as X-rays. Radiation-induced DNA damage can cause cell death or cancer.

Higher-frequency waves have greater energy, and they come in a variety of wavelengths and frequencies. The atmosphere of Earth absorbs gamma rays that come from space. They can obliterate living cells, bring about mutations, and result in cancer. Ironically, gamma rays can be employed to treat cancer despite their lethal effects.

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The molar mass of the triprotic acid used is 186.4 g/mol.

To calculate the amount of triprotic acid, we must first calculate the number of moles (n) of sodium hydroxide (NaOH) expended during the titration. To do this, we can use its molarity (c = 0.1063 M) and volume (V = 19.74 mL = 0.01974 L):

c = n/V ⇒ n = c*V

n(NaOH) = 0.1063 M * 0.01974 L

n(NaOH) = 0.0021 mol

Because 1 mol of a triprotic acid requires 3 moles of sodium hydroxide to be neutralized, the amount of the acid in the 20.00 mL sample will be:

n(acid) = n(NaOH) / 3

n(acid) = 0.0021 mol / 3

n(acid) = 0.0007 mol

Now we use a proportion to calculate the amount of acid present in a 250.0 mL sample:

0.0007 mol : 20.00 mL = X : 250 mL

X = 0.0007 mol * 250.0 mL / 20.00 mL

X = 0.00875 mol

Finally, we use the mass (m) and the number of moles to calculate the molar mass (M):

n = m/M ⇒ M = m/n

M = 1.631 g / 0.00875 mol

M = 186.4 g/mol

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Answer:

need They need water, nutrients and sun

Both need to capture certain substances from the environment, with the only difference being the method they use. Thus, while animals ingest them with food, plants absorb them from the soil. This is the case of water and nutrients.

Answer:

Explanation: its cold, so energy is being released to try to reach equal temp with the outside area of the cold pack

The amine will remain in the upper organic (ethyl acetate) layer, while the phenol and the carboxylic acid will be in the lower aqueous layer. Effectively, a separation of amine will be achieved using basic extraction technique.

Sodium hydroxide (NaOH) makes a basic solution when dissolved in water. It will react with the acidic components of the analyzed mixture during extraction. Amine is also basic, so it will not interact with sodium hydroxide and will remain in the organic layer. Carboxylic acid is, as the name implies, acidic, and thus will be neutralized by sodium hydroxide, forming a water-soluble sodium carboxylate salt, which means that it will be removed from the organic layer. Phenol is also acidic enough to be neutralized by sodium hydroxide, so it will also form a water-soluble salt (sodium phenoxide) and be removed from the organic layer.

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Answer: the speed of something in a given direction

Explanation:

yuuuuuuh

Answer:

Velocity defines the direction of the movement of the body or the object.

Explanation:

velocity is the speed of motion, action, or operation

The products of the chemical reaction are sodium hydroxide and acetone. This is because acetone undergoes aldol condensation. Synthetic reactions occur when two or more reactants combine to form a single product.

Sodium hydroxide is completely ionic and contains sodium and hydroxide ions. The hydroxide ion makes sodium hydroxide a strong base and reacts with acids to form the corresponding salts with water. The chemical formula for acetone is CH32CO. Also known as propanone or dimethyl ketone, it is the smallest and simplest ketone. It forms an iodoform when it reacts with iodine in the presence of NaOH. Thus it can be seen that iodoform is formed in the presence of NaOH.

Hydrochloric acid and caustic soda interact to form salts and release heat. As you can see table salt and water are the results of the interaction of two highly aggressive compounds. These compounds are ultimately harmless and even beneficial to humans. The reaction between benzaldehyde and acetophenone undergoes cross-aldol condensation in the presence of di-I. Sodium hydroxide. In this reaction, benzaldehyde has no alpha hydrogen.

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Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.

The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.

Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.

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Answer:

Balancing a chemical equation involves a certain amount of trial and error. In general, however, you should follow these steps:

Count each type of atom in reactants and products. Does the same number of each atom appear on both sides of the arrow? If not, the equation is not balanced, and you need to go to step 2.

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. Use the smallest coefficients possible. Warning! Never change the subscripts in chemical formulas. Changing subscripts changes the substances involved in the reaction. Change only the coefficients.

Repeat steps 1 and 2 until the equation is balanced.

Explanation:

Mass can neither be created nor destroyed.

Mass is described as the quantity of matter in a physical body. It can also be a measure of the body's inertia, the resistance to acceleration when a net force is applied.

The law of conservation of mass helps us to understand that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form.

According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.

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Jupiter have the force of gravity 2.54 times that of earth

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Gases are most ideal at high temperature and low pressure.

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By using the no. of moles, the mass of AgCl formed is determined to be 23.50g.

The mass of a material that includes the substance's particles is referred to as a mole.

The number of moles of a material equals to the ratio of its given mass to the mass of one mole of that substance in a chemical reaction. A mole / the no. of moles of any substance is equal to Avogadro's number, which is 6.023 x [tex]10^{23}[/tex]. Additionally, no. of moles is employed to represent concentration measurements like mole per liter and molecular weight.

[tex]2AgNO_3 (aq) + CaCl_2 (aq) \rightarrow 2AgCl (s) + Ca(NO_3)_2 (aq)[/tex]

Since [tex]AgNO_3[/tex] is in excess, the amount of product formed will be decided by the quantity of [tex]CaCl_2[/tex], which is the limiting reagent.

1 mole of [tex]CaCl_2[/tex] produces 2 moles of AgCl

No. of moles of [tex]CaCl_2[/tex] = mass of [tex]CaCl_2[/tex] / molar mass of [tex]CaCl_2[/tex]

No. of moles of [tex]CaCl_2[/tex] = 9.11 / 110.98 = 0.0820 moles

No. of moles of AgCl formed = 2 x 0.0820 = 0.164 moles

Mass of AgCl formed = No. of moles x molar mass

Mass of AgCl formed = 0.164 x 143.3 = 23.5012g

Result:

23.50g of AgCl is formed.

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Answer: Cubic meters: .01176

Liters: 11.76

Cubic inches: 717.639231

Cubic feet: 0.415300481

Explanation:

The kinetic energy that the liberated electron has in eV based on the given values is :

10.28 eV.

A photoelectron's maximum kinetic energy is given by

                     Emax = hf - W

here given,

f = 3.62 x 10¹⁵ Hz

W = 4.70 eV

 by recalling the equation for a photoelectron's maximum kinetic energy with given values,

  Emax = hf - W

             = ((4.14 × 10⁻¹⁵eV.s)(3.62 x 10¹⁵ Hz)) - (4.70 eV)

             = 10.28 eV

As a result, we discovered that the maximum kinetic energy of electrons is 10.28eV.

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Answer:

Solid

Explanation:

Solid state because carbon dioxide can go sublimation so generally at relatively lower temperature it is found in solid form but at room temperature,ie, 25 to 30°C it is found in gaseous state.