Dolomite is very similar to calcite, but some of the calcium in its structure has been replaced with ______.

Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.

The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.

The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.

Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.

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Answer:

Explanation:

intermolecular forces mediated by hydrogen bonding are disrupted when ice melts.

Body temperature is controlled by a negative feedback control system.

What is negative feedback?

In biological systems, a type of control known as negative feedback occurs when a process's output lowers its own stimulus. A common regulation mechanism in many biological responses is feedback. The body may regulate numerous aspects of its internal environment by permitting particular routes to be switched on and off. This is like turning a switch. Feedback enables a pathway's output to operate a switch. Negative feedback, often known as a "negative feedback loop," happens when a pathway's end product disables the corresponding metabolic step.

In order to maintain body temperature, the hypothalamus reacts to this information by directing nerve impulses to effectors. For instance, the hair erector muscles tighten up if we get too cold. As a result, a layer of air is trapped near to the skin, raising the skin hairs. Systematic negative feedback regulates body temperature.

Thus the hypothalamus is the vital organ for this system.

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Answer:

They are called inert gases because they are stable and non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.

Explanation:

They are also know as the "noble" gases.

Control Experiment: Those experiment where a control is taken as a reference to notice the changes in same reaction in the presence of external stress.

Need for a control in a experiment: The control is required to analyse the effect of stress applied to reaction. For e.g. If there are two compounds AB and XY & they are undergoing displacement reaction to form AX & BY, But all sudden another salt let MN is added into the reaction then there are possibilities of formation of different products depending upon the reactivity of initial reactants and external compound. The product can be same as our Control i.e. AB & XY if MN remains inert in the reaction. That's why control is important to compare the results.

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The ion is sodium ion.

An ion is obtained by the removal of an electron from an atom. An ion could be positively charged or negatively charged. If the ion contains more electrons than protons then it is positively charged and vice versa.

An ion is positive when electrons are lost and the ion is negative when electrons are gained. In a negative charge, the electron cloud spreads out and the ion becomes larger. When we have a positive ion, the ion is smaller than the neutral atom.

Now, we can see that neon has an atomic number of 20 thus it has 10 electrons. If the ion contains one more proton then the atomic number of the element is 11. We are told that it contains two more neutrons hence the mass number is 22.

Given that the both species have the same number of electrons thus the ion must be sodium ion.

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The answer to this question is

0.0037 ml is the measurement which has only non-significant figures.

The basic rules of significant figures are:

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The composition, in atom percent, of an alloy that consists 90.5 wt Ag and 9.5 wt Cu is 84.5% and 15.2%.

Here, the lever rule is used to determine the composition of co-existing phases which are, Ag and Cu, of an alloy.

The given data is :

To calculate composition of silver, expression used is,

  C(Ag) =                W(Ag) × M(Cu)                 x 100

                ( W(Ag) × M(Cu) + W(Cu) × M(Ag) )

Substituting the values in the above expression,

  C(Ag) =                ( 90.5 × 63.55 )                x 100

                    ( 90.5 × 63.55 + 9.5 × 107.87 )

        C(Ag) = 84.5%

To calculate composition of copper, expression used is,

  C(Cu) =                W(Cu) × M(Ag)                  x 100

                ( W(Ag) × M(Cu) + W(Cu) × M(Ag) )

Substituting the values in above expression,

  C(Cu) =             (9.5 × 107.87)              x 100

                ( 90.5 × 63.55 + 9.5 × 107.87 )    

        C(Cu) = 15.2%

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6 vibrational degrees of freedom in dichloromethane (ch2cl2)

No of independent way in which a molecule or an atom can exhibit motion is called degree of freedom Here, dicloromethane is a non linear molecule that's why degree of freedom for non linear molecule is 3N-6. here N= no of atom involved in that molecule so in dicloromethane 3N-6=3×4-6=12-6=6

Therefore in dichloromethane 6 vibrational degree of freedom

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True, the specific heat capacity of an object depends only on the substance from which the object is made.

Specific heat capacity is defined as the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

The SI unit of specific heat capacity is joule per kelvin per kilogram.

The specific heat capacity at constant volume is written as,

[tex]C_{V} = (du/dt)_{V}[/tex]

The specific heat capacity at constant pressure is written as,

[tex]C_{P} = (dh/dT)_{P}[/tex]

here, u is the internal energy of system in kJ/kmol and h is the enthalpy of system in kJ/kmol.

For an Ideal gas the relation between heat capacity at constant volume and at constant pressure can be written as ,

[tex]C_{P} - C_{V} = R[/tex]

Specific heat capacity is an intensive property i.e., independent of quantity. No matter how much substance we have, its ability to absorb heat energy at a particular temperature is the same.

So, we can say that the specific heat capacity of an object depends only on the substance from which the object is made and not on its quantity.

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Answer:

3 Significant Figures.

Explanation:

The zeros to the left of non-zero numbers are Leading Zeros. These zeros are NOT significant. They serve as placeholders to locate the decimal point.

Answer:

3

Explanation:

To determine the number of significant figures in a number use the following 3 rules:

Non-zero digits are always significant

Any zeros between two significant digits are significant

A final zero or trailing zeros in the decimal portion ONLY are significant

Example:  .500 or .632000 the zeros are significant

                .006  or .000968 the zeros are NOT significant

Answer:

It regulates metabolic activity of a cell

It promotes the growth of new cell and cell multiplication.

It produce energy

Answer:

As mitochondria is known as powerhouse of cell,its functions are:

It produces energy required for the cell.

It stores the energy.

It promotes cell growth and cell multiplication.

If 0.141 MOL of Lauric acid has a mass of 28.2 g, the empirical formula of lauric acid is C₁H₂O₁.  And the molecular formula of lauric acid is C₁₂H₂₄O₂.

The empirical formula is the simplest whole number ratios of the moles of the compounds. They are the atoms present in the compound.

The molecular formula tells the total number of atoms present in the element of a compound.

The empirical formula of lauric acid is C₁H₂O₁. if 0.141 MOL of lauric acid weighs 28.2 g. Lauric acid's chemical formula is C₁₂H₂₄O₂.

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The melting point and the normal boiling point of water in respective temperatures in kelvins are 273 and 373. The correct option is 5.

The boiling point is the point of water when the water vapor of the water is equal to the water vapor of the atmosphere.

The melting point is the point when a solid-state converts into liquid, and changes its physical state.

In Celsius, the boiling point is 100⁰C

In Kelvin, 273 + 100 = 373 K

The melting point is ice is 0⁰C

273 + 0 = 273 K

Thus, the correct option is 5. 273 and 373.

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Microscale reactions involve reaction mixtures with volumes of 5 ml or less than 5 ml.

The benefits of microscale chemistry are as :

Microscale reactions, delay with extremely small amounts of reagents and solvents, which reflects in the name,  the reactions mainly work with 300 mg of compounds and solvent with volumes of 5 ml or less than 5 ml.

The benefits of such kind of chemistry are such as the first there is the involvement of less time in conducting the procedure, it allows repetition if something fails, second beacuse of usage of less chemical, lesser use of glassware of it is cost efficient, next there is a reduction in safety hazards such as possible explosions, and it efficient as it leads to minimizing in the quantity of waste.

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The density of water at room temperature is 1.0 g/ml.

Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.

The formula to calculate the density is:

                                        ρ =m/v

where,

ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.

For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.

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Answer:

C. The element that is oxidized loses electrons, and the element that is reduced gains electrons.

Explanation:

When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons

A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l).  this client would have a high serum concentration of cholesterol.

Individuals or groups seeking professional advice or services, such as lawyers, accountants, advertising agencies, and architects. Those who receive benefits or services from social welfare corporations, government agencies, etc. Someone who is under the patronage of someone other than the customer.

An example client is a student teaching at a university writing center. A terminal or computer is connected to the server. A person receiving help or advice from a professional (lawyer, accountant, social worker, psychiatrist, etc.). A client, used in home and business networks, is any computer hardware or software device that requests access to services provided by a server. A client is usually considered a requesting program or user in a client/server architecture.

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One of the hydrogens in the NH3 is replaced in the first reaction by the methyl group, or -CH3. The NH3 can have more than one H substituted for it, therefore the final product frequently comprises a blend of methylamine, dimethylamine, and trimethylamine.

A halogenoalkane and ethanolic ammonia can be used in a nucleophilic substitution process to produce primary aliphatic amines like methylamine (CH3NH2).

NH3 + CH3Cl = HCl + CH3NH2

The process is challenging because any unreacted ammonia can react with the generated HCl:

NH3+HCl yields NH4Cl.

Since the N in CH3NH2 still has a single pair of electrons, it can act as a base and interact with the HCl that is created in one of the following ways:

CH3NH2+HCl becomes CH3NH3+Cl.

or as a nucleophile and react with any chloromethane that hasn't been reacted:

(CH3)2NH + HCl = CH3NH2 + CH3Cl

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As long as the sample has the same number of atoms for both elements, the mass ratio is independent of the sample size.

The arithmetic mean is calculated by adding a set of numbers, dividing by their count, and then taking the result. The molecular masses of different substances vary. Therefore, variable numbers of atoms, molecules, or moles exist in masses of equal mass. On the other hand, equal quantities of moles of different substances have different masses. The result will be disproportionately impacted by the one data point if you attempt to calculate an "average of averages". In essence, the value of the average of 10,000 data points is the same as that of the average of a single data point.

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The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.

Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.

There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.

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The mole is the si unit that expresses the amount of substance

It provides a specific measure of the number of atoms or molecules in a bulk sample of matter. A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions) as the number of atoms in a sample of pure 12C weighing exactly 12 g

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The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹

According to Beer-Lambert law,

"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."

A = εbC ......(i)

Where A ⇒ Absorbance

ε ⇒  Molar absorptivity

b ⇒ Length of the light path

c ⇒ Concentration

Now, A = 86%

b = 1.0cm

C = 0.16M

From (i)

A = εbC

0.86 = ε × 1 × 0.16

0.86 = ε × 0.16

ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹

ε = 5.375 mol L⁻¹ cm⁻¹

Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹

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It is given that volume & density of liquid = 30.0ml = 1.52 g/ml

is read Density is as 1.529  g/ml

mass of Ime of liquid is 1.529.

option A is correct.

So, the mass of 30 ml liquid. = (1.52 x 30 g/ml ml =

1.529 X 30 g

45.69 g

the question is incomplete

A liquid is a nearly incompressible fluid that conforms to the shape of its container but maintains (nearly) constant volume regardless of pressure. As such, it is one of the four fundamental states of matter (the others being solids, gases, and plasmas) and is the only state with a definite volume, but no fixed shape. Liquids are made up of tiny vibrating particles of atom-like matter held together by intermolecular bonds. Like gases, liquids can flow and take the form of containers.

The volume of a liquid is fixed, but the shape is not. Examples of liquids are water, oil, and blood. A liquid is a state of matter that has a fixed volume but no fixed shape. That is, the liquid takes the shape of its container. The matter is something that takes up space and has weight. Solids keep their shape, liquids take the shape of their containers, and gases fill their containers.

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You have to calculate the mass of a 30.0 mL liquid sample with density of 1.52 g/mL, but you have forgotten the formula. Which way of reasoning would help you in finding the correct mass?

Select one:

a. If 1 mL of a liquid has the mass of 1.52 g, then 30.0 mL has the mass of _____ g.

b. If 1.52 mL of a liquid has the mass of 1 g, then 30.0 mL has the mass of _____ g.

Answer:

1. there are 29,000 grams present in 29 kilograms

2. there are 2000 millimeters present in 2 meters.

check out this conversion table if you get stuck again! :)

Answer:

Lu

Hf

Ta

Explanation:

Lu- Lutecium
Atomic Number- 71
Atomic Mass-174.967

Hf- Hafnium
Atomic Number-72
Atomic Mass178.492

Ta- Tantalum
Atomic Number-73
Atomic Mass-180.948

The chemical elements that meet the criteria are Hafnium (Hf) and Tantalum (Ta).

The atomic number represents the number of protons in the nucleus of an atom, while the atomic mass represents the total mass of protons and neutrons in the nucleus of an atom.

Elements with atomic numbers greater than 70 are located in the bottom rows of the periodic table, known as the "lanthanides" and "actinides."

So, Atomic Number > 70 and Atomic Mass < 181.2 u

1. Hafnium (Hf) - Atomic Number: 72, Atomic Mass: 178.49 u

2. Tantalum (Ta) - Atomic Number: 73, Atomic Mass: 180.95 u

3. Tungsten (W) - Atomic Number: 74, Atomic Mass: 183.84 u

4. Rhenium (Re) - Atomic Number: 75, Atomic Mass: 186.21 u

Therefore, the chemical elements are Hafnium (Hf) and Tantalum (Ta).

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Pepsin can begin the digestion of protein in the stomach after it is converted from pepsinogen by Hydrochloric acid (HCl)

Hydrochloric acid (HCl) converts the pepsinogen to pepsin. It breaks down the proteins into the peptides.

                    Pepsinogen ------HCl-----> Pepsin

HCl maintains a pH of 2.0 in the stomach.

Pepsin is a digestive enzyme which breaks down the protein in the stomach.

When pepsinogen and hydrochloric acid are present in the gastric juice together, pepsin takes its active form, because HCl is a very strong acid. It denatures the protein. It degrades the extra polypeptide of pepsinogen. This extra polypeptide covers the active site.

Chief cells of gastric regions secretes the enzyme pepsin in an inactive form called pepsinogen. A low pH of 1.5 to 2 activates pepsin.

Pepsin has many uses as it is used in the treatment of indigestion and pancreatitis. It helps in the digestion of food.

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Start by setting up your materials you would put one plant in mulch and one without. After 2-3 weeks of proper care of the plants you record your findings, did the plant grow more without without the mulch?