a chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 3.2 mL. If the metal weighs 1.5g, what is the density in g/mL of the metal?

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:

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,

Answer:

117.21g/mol

Explanation:

The reaction of a diprotic acid, H₂X with NaOH occurs as follows:

H₂X + 2NaOH → Na₂X + 2H₂O

Where 2 moles of NaOH reacts per mole of the diprotic acid

Knowing the moles of NaOH and the chemical equation we can determine the moles of the diprotic acid. With the moles and its mass we can find the molar mass of the acid, thus:

Moles of the diprotic acid:

To reach the equivalence point, it requires 13.48mL = 0.01348L of 1.0M NaOH. That is:

0.01348L × (1mol NaOH / L) = 0.01348 moles NaOH

As 2 moles of NaOH reacts per mole of the diprotic acid, moles of the acid are:

0.01348moles NaOH × (1mol H₂X / 2mol NaOH) = 0.00674 moles of H₂X

Molar mass:

The molar mass of a compound is the ratio between the mass you have per mole. As mass is 0.79g and moles are 0.00674moles, molar mass is:

Molar mass: 0.79g / 0.00674mol =

Answer:

Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.

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

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:

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:

The amount is [tex]x = 113.3 \ dollars[/tex]

Explanation:

From the question we are told that

     The  distance traveled per day is  [tex]l = 109\ km = \frac{109}{1.609} = 67.74 \ mi[/tex]

    The  cost of one liter is  [tex]c = 1.10 \ euros/liter = 1.10 * 1.26 = 1.36 \ dollars/liter[/tex]

     The car's  gas mileage is  [tex]b = 22.0 \ mi/gal[/tex]

Generally the amount of distance covered in one week is evaluated as

      [tex]z = 67.74 * 7[/tex]

       [tex]z = 474.18 \ mi[/tex]

The  amount of gas used in one week by the car is mathematically represented as  

       [tex]k = \frac{ z}{ b}[/tex]

=>    [tex]k = \frac{ 474.18}{ 22}[/tex]

=>      [tex]k = 22 \ gal[/tex]

converting to liters

          [tex]k = 22 * 3.78541=83.28 \ liters[/tex]

Thus the amount spent on gas in one week is  

          [tex]x = k * c[/tex]

=>      [tex]x = 83.28 * 1.36[/tex]

=>      [tex]x = 113.3 \ dollars[/tex]

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:

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:

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: 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:

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:

45000 atoms

Explanation:

From the question given above, we were told that a molecule of a sugar is made up of 45 atoms. This implies that:

1 molecule of sugar = 45 atoms

With the above idea in mind, we can obtain the number of atoms present in 1000 molecules of the Sugar as follow:

1 molecule of sugar = 45 atoms

Therefore,

1000 molecules of sugar = 1000 × 45 = 45000 atoms.

Therefore, there are 45000 atoms present in 1000 molecules of the sugar.

im just typing so u can give them brainliest :)

Answer:

[tex]6.43x19^8mg[/tex]

Explanation:

Hello,

In this case, this unit conversion is performed by knowing that 1 kg of mass contains 1000 g and 1 g contains 1000 mg, therefore, the result is:

[tex]643kg*\frac{1000g}{1kg} *\frac{1000mg}{1g}\\ \\=6.43x10^8mg[/tex]

Regards.

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:

Explanation:

1.A-

2.B+

3.D2+

4.C2-

Answer:5.5673

Explanation: I searched it up for you

Answer:

Explanation:

Ba(s) + Mn²⁺ (aq,1M)  →      Ba²⁺ (aq,1M) + Mn(s)

Ba⁺²(aq) +2e →  Ba(s) ,  E° =  −2.90 V  

Mn⁺²(aq) +2e → Mn(s),  E⁰  =0.80 V

Anode reaction :

Ba(s)  →  Ba⁺²(aq) +2e        E° =  −2.90 V  

Cathode reaction :

Mn⁺²(aq) +2e → Mn(s)          E⁰  =0.80 V

Cell potential = Ecathode  - Eanode

Ecell  = .80 - ( - 2.90 )

Ecell = 3.7 V .

equilibrium constant ( K ) :

Ecell = .059 log K  / n

n = 2

3.7  = .059 log K  / 2

log K = 125.42

K = 2.63 x 10¹²⁵ .

Free energy change :

ΔG = - n F Ecell

= - 2 x 96500 x 3.7

= 714100 J

= 7.141 x 10⁵ J .

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.

Find out more information about equilibrium here:

https://brainly.com/question/19340344

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.

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]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:

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:

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:

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 The number of protons

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

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