what cells form enamel?​

Answer:

113.12 dollars

Explanation:

From the question we are told that you drive 109km/day and your gas milage = 22miles/gallon

Step 1

We convert 109km to miles

1 km = 0.6214 miles

109km =

109km × 0.6214miles/ 1 km

= 67.7326miles

Step 2

Since the gas mileage = 22miles per gallons, we calculated how many gallons of fuel you used in a day

22 miles = 1 gallon

67.7326 miles = x gallon

Cross Multiply

x gallon × 22 miles = 67.7326 × 1 gallon

x gallons = 67.7326 miles × 1 gallon/22 miles

x gallons = 3.0787545455 gallons

Approximately = 3.08 gallons of gas

Hence, in a day you use 3.08 gallons of gas.

Step 3

We are told that has cost 1.10 euros/ liter

Hence, we convert the amount of gas you used in gallons to liters

1 gallon = 3.785 liters

3.08 gallons = y liters

1 gallon × y liters = 3.08 gallons × 3.785 liters

y liters = 3.08 × 3.785/1

y = 11.6578 liters.

So in a day you use 11.6578 liters of gas.

Step 4

Assume that 1euro=1.26dollars.

We are also told that has = 1.10 euros per liters

We convert the amount in Euros to dollars

1 euro = 1.26 dollars

1.10 euros =

1.10 × 1.26

= 1.386 dollars

Hence gas costs 1.386 dollars per liter

Step 5

Since : 1 liter of gas = 1.386 dollars

11.6578 liters of gas =

= 11.6578 liters × 1.386 dollars/ 1 liter

= 16.1577108 dollars

Therefore, in 1 day, you spend approximately = 16.16 dollars on gas

Step 6

The final step:

We are asked to calculate how much you spent on gas in 1 week

1 week = 7 days

Therefore, if

In 1 day you spend = 16.16 dollars on gas

7 days =

= 7 × 16.16 dollars

= 113.12 dollars

Therefore, the amount money you would spend on gas in one week = 113.12 dollars.

Answer:

the proton and the neutron

Explanation:

mass of The proton is approximately  1.6726 × 10^-27 Kg

mass of the electron  is approximately 9.109 × 10^-31 Kg

mass of the neutron  is approximately 1.6749 × 10^-27 Kg

Here we see that mass of proton and neutron is approximately similar.

_____________________________________________

Lets see what is  the mass of these particle IN atm unit

mass of these particles can also be described in form of amu(atomic mass unit)

1 atm is the mass defined as 1/12 th of mass of the carbon-12(c-12) atom.

In terms of unit atm

mass of proton = 1 amu

mass of electron = 5.45 × 10−4 amu

mass of neutron = 1 amu

hence we can say that mass of proton = mass of neutron.

mass of atom is sum of mass of all the neutron and proton in the atom.

Hence, mass of neturon and atom cannot be equal.

This makes option four the neutron and the atom , the wrong choice.

correct answer is the proton and the neutron

therefore, An atom contains one proton , one electron and one neutron then, mass of proton is similar in mass of neutron.

Answer:

proton and neutron

Explanation:

Answer:

Analyte.

Explanation:

Hello,

In this case, in a titration, an analyte is known as the the substance whose quantity or concentration is to be carefully determined (initially unknown) by using a titrant with a controlled volume and an accurately-known concentration which is also called a standard solution.

You can verify this by considering the attached picture.

Regards.

The density of metal will be "0.469 g/mL".

The given values in the question are:

Now,

The density of metal will be:

→ [tex]Density = \frac{Mass}{Volume}[/tex]

By substituting the given values, we get

→               [tex]= \frac{1.5}{3.2}[/tex]

→               [tex]=0.469 \ g/mL[/tex]

Thus the above is the appropriate answer.

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The density of the metal is 0.47 g/mL

The density of an object is defined as the mass of the object per unit volume of the object.

With the above formula, we can obtain the density of the metal. This is illustrated below:

Volume of metal = change in volume of water = 3.2 mL

Mass of metal = 1.5 g

Density = mass / volume

Density = 1.5 / 3.2

Therefore, the density of the metal is 0.47 g/mL

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Answer:

113 km³

Explanation:

Step 1: Given data

Radius of the meteor (r): 3 km

Step 2: Calculate the volume (V) of the meteor

The meteor is spherical. Given the radius (r), we can calculate the volume of a sphere using the following expression.

V = 4/3 × π × r³

V = 4/3 × π × (3 km)³

V = 4/3 × π × 27 km³

V = 113 km³

The volume of the meteor is 113 km³.

Answer:

4-oxopentanoic acid.

Explanation:

In this case, we must remember that the Grignard reaction is a reaction in which carbanions are produced. Carboanions have the ability to react with CO2 to generate a new C-C bond and a carboxylate ion. Finally, the acid medium will protonate the carboxylate to produce the carboxylic acid group.

The molecules that can follow the mechanism described above are the molecules: p-methylbenzoic acid, cyclopentane carboxylic acid and 3-methylbutanoic acid. (See figure 1)

In the case of 4-oxopentanoic acid, the possible carbanion will attack the carbonyl group to generate a cyclic structure and an alcohol group (1-methylcyclopropan-1-ol). Therefore, this molecule cannot be produced by this reaction. (See figure 2)

Answer:

giant covalent structures

Explanation:

Covalent solids are made up of atoms joined to one another by covalent bonds to form a giant lattice. The covalent bonds are very strong, this makes the giant covalent solids to be hard and possess high melting points. Covalent solids are nonconductors of electricity due to the absence of free electrons in the structure.

Diamond, graphite and boron nitride are all examples of giant covalent structures.

Answer and Explanation:

The octet rue  depicts the overall trend of chemical bonding in which atoms of an elements would seek to attain stability by filling out their valence shell with eight (8) electrons, giving it the same electronic configuration as a noble gas (specifically Argon).

Hence Carbon with 4 valence electrons (2, 4 electronic configuration) would take on four bromine atoms with 7 valence electrons (2, 8, 4 electronic configuration) each, giving each Br atom the single electron it needs to achieve octet stability.

Carbon tetrabromide

Chemical formula: [tex]CBr_{4}[/tex]

I  hope this is a clear explanation

Answer:

Explanation:

1.A-

2.B+

3.D2+

4.C2-

Answer:

The molar mass of the unknown is approximate 145g/mol

Explanation:

We can relate the speed of effusion of gases with the molar mass of the 2 compounds using Graham´s law:

[tex]\frac{v_a}{v_b} =\sqrt{ \frac{m_b}{m_a} }[/tex]

Where V is speed of the gas and m molar mass of a and b gases.

Molar mass of helium is 4g/mol. As the distance of the gases is the same, we can replace the speed of effusion with the time the gas takes to travel the distance. The equation will be:

[tex]\frac{t_b}{t_a} =\sqrt{ \frac{m_b}{m_a} }[/tex]

Replacing:

[tex]\frac{10.0min}{1.66} =\sqrt{ \frac{m_b}{4g/mol} }\\6.024 = \sqrt{ \frac{m_b}{4g/mol} }\\36.29 = \frac{m_b}{4g/mol}\\145 g/mol =m_b[/tex]

Answer:

d. tertiary and quaternary

Explanation:

Form or shape of protein can be understood by its structure. The structure of protein encompasses four levels of protein :

Hydrophobic Interactions refers to amino acids with non polar r group structure together on inside of protein, which leaves Hydrophobic amino acids outside to interact with surrounding water molecules.

These help to stabilise : D) Tertiary & Quaternary protein structures.

Answer:

Usually, the substance present in the greatest amount is considered the solvent.

Answer:

D The number of protons

Answer:

iii. both have the same molecular polarity

Explanation:

Both CF4 and CO2 are nonpolar molecules.

CF4 is a tetrahedral molecule, the compound is highly symmetrical hence the individual dipole moments due to the four C-F bonds cancel out thereby making the molecule to be nonpolar.

Similarly, the direction of the two dipoles in CO2 cancel out since they are directed in opposite directions making the molecule nonpolar.

Answer:

[tex]V=2.5x10^{-4}m^3\\\\V=0.25L[/tex]

Explanation:

Hello,

In this case, since the density is defined as the degree of compactness a substance has and is mathematically defined as:

[tex]\rho =\frac{m}{V}[/tex]

Thus, for this problem, as we know both the density and mass of water we can compute the volume as shown below:  

[tex]V=\frac{m}{\rho}=\frac{0.250kg}{1000.0kg/m^3}\\ \\V=2.5x10^{-4}m^3\\\\V=0.25L[/tex]

Best regards.

Answer:

She should bisect from point M and then draw a line from the point where the arcs from M and N meet to point O

Answer:

1.1442 moles| litre,NaCl

Explanation:

RAM:56g|mole

number of moles=36.5g÷58g|mole =0.6293moles

0.6293 is contained in 550ml

                    =1000ml

[1000×0.6293]÷550 =1.1442moles| litre,NaCl

Answer:

It is a step by step process

Explanation:

You cannot do the experiment and lab report without following the steps

Hope this is correct and helpful

HAVE A GOOD DAY!

Answer:

Bigleaf hydrangeas are blue if the pH is between 5.0 and 5.5. The flowers

turn pink when the pH gets around 6.0. The flower color is dependent on

the concentration of aluminum ions (Al+++) in the soil. Aluminum is more

available to the plant when the soil is acidic, less available when the soil is

alkaline.The color of the cultivar called “Endless Summer” of H. macrophylla depends

on soil pH. Red or pink blooms result from neutral or basic soil (pH 7 and

above), whereas blue blooms indicate acidic conditions (pH less than 7).

Answer:

D) 4

Explanation:

If we want to find the asymmetric centers, we must first remember that in an asymmetric center, in the carbon, we will have 4 different types of groups bonded to it.

Therefore we must look for carbons that have 4 different groups. With this in mind, we can look at each carbon.

Carbon 1

In this carbon, we have two bonds with the oxygen, therefore, we dont have 4 different groups. So, this is not an asymmetric center.

Carbon 2

In this carbon, we have an "OH" in the top, an hydrogen in the bottom a carbonyl group in the right, and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

Carbon 3

In this carbon, we have an "OH" at the bottom, an hydrogen in the top, a CHOH group in the right (that is bonded to a carbonyl group), and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

Carbon 4

In this carbon, we have an "OH" at the top, an hydrogen in the bottom a CHOH group in the right (that is bonded to a CHOH group), and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

Carbon 5

In this carbon, we have an "OH" at the bottom, an hydrogen in the top, a CHOH group in the right (that is bonded to a CHOH), and a CH2OH in the left. We have 4 different groups. So, this is an asymmetric center.

Carbon 6

In this carbon, we have two bonds with hydrogens, therefore, we dont have 4 different groups. So, this is not an asymmetric center.

See figure 1

I hope it helps!

Answer:

Positively charged:  Lysine, Histidine

Negatively charged:  Asparagine, Phenylalanine, Glutamatic acid, Alanine, Glycine, Leucine, Aspartic acid

Explanation:

The charge of an amino acid in solution is determined by its isoelectric point, pI, which is the characteristic pH in which the net electric charge of the amino acid is zero. In solutions of pH below the isoelectric point, the amino acid has a net positive charge whereas in solutions with pH above isoelectric point, the net charge on the amino acid is negative.

In a buffer solution of pH 6.5, the following charges are present in the amino acids given:

Positively charged:  Lysine (pI = 9.74), Histidine (pI = 7.59)

Negatively charged:  Asparagine (pI = 5.07), Phenylalanine (pI = 5.48), Glutamatic acid (pI = 3.22), Alanine (pI = 6.01), Glycine (pI = 5.97), Leucine (pI = 5.98), Aspartic acid (pI = 2.77)

Answer:

[tex][A]_{eq}=0.095M[/tex]

Explanation:

Hello,

In this case, for the reaction:

[tex]A+B\rightleftharpoons C+D[/tex]

It is clear that the equilibrium expression is:

[tex]Kc=\frac{[C][D]}{[A][B]}[/tex]

Nevertheless, since the initial concentrations of both A and B are 0 M and C and D 1.6 M, we should invert the reaction:

[tex]C+D\rightleftharpoons A+B[/tex]

Thereby the equilibrium expression is also inverted:

[tex]Kc=\frac{[A][B]}{[C][D]}[/tex]

Which can be written in terms of the reaction extent and initial concentrations as shown below:

[tex]\frac{1}{Kc} =\frac{x*x}{([C]_0-x)([D]_0-x)}\\\\\frac{1}{0.47}= \frac{x*x}{(1.6-x)(1.6-x)}[/tex]

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

[tex]x=0.095M[/tex]

In such a way, the equilibrium concentration of A is:

[tex][A]_{eq}=x=0.095M[/tex]

Best regards.

The equilibrium concentration of A will be "0.095 M". To understand the calculation, check below.

According to the question,

Initial concentration for A and B = 0 M

For C and D = 1.6 M

Kc = 4.7

Here the reaction:

→ A + B [tex]\rightleftharpoons[/tex] C + D

We know the expression,

Kc = [tex]\frac{[C][D]}{[A][B]}[/tex]

By inverting the reaction,

→ C + D [tex]\rightleftharpoons[/tex] A + B

Kc = [tex]\frac{[A][B]}{[C][D]}[/tex]

By substituting the values,

[tex]\frac{1}{Kc}[/tex] = [tex]\frac{x\times x}{([C]_0 -x)([D]_0 -x)}[/tex]

    = [tex]\frac{x\times x}{(1.6 - x)(1.6 -x)}[/tex]

 x = 0.095 M ([tex][A]_{eq}[/tex])

Thus the above approach is correct.

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Answer:

A) MgCO₃ is insoluble

Explanation:

Based on the rules of solubility:

All nitrates are soluble. That means Pb(NO₃)₂ is soluble.

All ammonium ions are soluble. NH₄Br is soluble.

All phosphate are insoluble except when combined with group I ions (Li, Na, K...) K₃PO₄ is soluble.

Also, all carbonates are insoluble except when combined with group I ions. That means Li₂CO₃ is soluble and:

Answer:

c. tertiary.

Explanation:

In this case, we can review the definition of each level of structuration in the proteins:

Primary structure

In the primary structure, the amino acids are linked by peptide bonds. That is, the order of the amino acids is the criterion that defines this type of structure.

Secondary structure

In the secondary structure, we have to look at the way in which the protein is folded. The options are:

  -) Beta-laminar: A structure in which the protein has a planar shape.

  -) Alpha-helix: A structure in which the protein has a cross-strand form.

Tertiary structure

In the tertiary structure, the R groups that the amino acids have in the primary structure can generate interactions with each other. Interactions such as hydrogen bridges, dipole-dipole, hydrophobic interactions. This makes the protein have a very specific three-dimensional structure, on which its function depends.

Quaternary structure

In the quaternary structure, several subunits may be attached, or there may be prostatic groups (metals that can help to attach various protein units).

With all these in mind, the deffinition that fits with the description in the question is the tertiary structure.

I hope it helps!

The specific spatial arrangement of amino acid residues that are close to each other in the polypeptide chain is called the tertiary structure of a protein.

Protein structure is three dimensional in shape, where the atoms are arranged in amino acid chain. The chain is polypeptide containing many amino acid sequences.

The tertiary structure have a single polypeptide chain which is called the backbone.

Therefore, the specific spatial arrangement of amino acid residues that are close to each other in the polypeptide chain is called the tertiary structure of a protein.

Learn more on protein structure here,

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Answer: a. The best-fit line allows us to predict behavior between measured data using its slope.

Explanation:

A line of best fit is drawn through a scatter-plot to determine the direction of an relation between two quantities.

The line of best fit can be used to make prediction for the dependent variables.

Hence, the purpose of the best-fit line on an experimental scatter-plot is to predict behavior between measured data using its slope.

Hence, the correct option is "a."

Answer:

the standard cell potential value

Explanation:

For every cell, we can calculate its standard electrode potential from the table of standard electrode potentials listed in many textbooks.

However, from Nernst's equation;

Ecell= E°cell - 0.0592/n log Q

Hence the standard cell potential (E°cell) affects the value of the calculated cell potential Ecell from Nernst's equation as stated above.

Answer:5.5673

Explanation: I searched it up for you

Explanation:

The exact person is unkown cooper has been around for ages since 9000 BC in the Middle East are the earliest discoveries

Although various copper tools and decorative items dating back as early as 9000 BCE have been discovered, archaeological evidence suggests that it was the early Mesopotamians who, around 5000 to 6000 years ago, were the first to fully harness the ability to extract and work with copper

Answer:

C is the reaction intermediate.

Explanation:

A reaction intermediate is a molecular structure that is formed during the reaction but then is converted in the final products.

Usually, these reaction intermediates are unestable and, for that reason, the lifetime of these structures is low.

In the reaction, you can see in the first step C is produced, but also, in the second step reacts producing D. As is produced and, immediately consumed,