100 Points! Question in photo

Answer:

When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.

Explanation:

When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.

As every atom consists of three sub-atomic particles which are protons, neutrons, and electrons.

Protons and neutrons reside inside the nucleus of an atom and electrons revolve outside the nucleus of the atom.

A covalent bond is defined as the bond formed by sharing of electrons between the two combining atoms.

Therefore, the given questions are answered as follows.

There are 2 electrons in the n = 1 shell.

There are 5 electrons in its n = 2 shell.

There are 5 electrons in nitrogen's outer shell before sharing electrons.

6 electrons are being shared between the two nitrogen atoms.

Covalent bonds exist between the two nitrogen atoms.

Explanation:

1. In the 1 shell there are 2 electrons

2. in the second shell there are 5 electrons

3. To complete the 2 shell are needed 3 electrons

4. Each of them share 3 elections

5. 3 bonds exist between the two nitrogen atoms

Explanation:

Hi, I think the answers Iodine.

hope it helps

The average molecular weight of bovine cytochrome c = 13800 Da

Explanation:

bovine cytochrome c contains 2 methionine residues

so the 1 mole of bovine cytochrome c will contain 2 moles of methionine residues.

molar mass methionine residue = 149 g/mol

if both residues are present at the terminal, then

'C' terminal eliminates the 'H' group and the 'N' terminal eliminate the 'OH' group

its mass = (2*149) - 1 - 17 = 280 g

mass of methionine residues in 1 mole of bovine cytochrome c = 280 g

mass % of methionine residues in bovine cytochrome c = 2%

mass % = (mass of individual component / total mass of the compound ) *100

mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100

mass of individual methionine residues = 280 g

mass % of methionine residues in bovine cytochrome c = 2%

2 = (mass of individual methionine residues/mass of bovine cytochrome c ) *100

(2/100) = (280 / mass of bovine cytochrome c)

0.02 = (280 / mass of bovine cytochrome c)

mass of bovine cytochrome c = 280 / 0.02 = 14000 g

mass of bovine cytochrome c = 14000 g

since this calculation is done for 1 mole of bovine cytochrome c

so the mass of 1-mole bovine cytochrome c = 14000 g

mass of 1-mole bovine cytochrome c = molecular weight of bovine cytochrome c

The molecular weight of bovine cytochrome c = 14900 g/mol

1 g/mol = 1 Da

the molecular weight of bovine cytochrome c when both residues are terminal  = 14900 Da

when both residues are not present at the terminal, then

non-terminal eliminate H2O group

mass of residues = 2*(149 -18 ) = 262 g

mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100

2 = ( 262 / mass of bovine cytochrome c ) *100

0.02 = 262 / mass of bovine cytochrome c

mass of bovine cytochrome c = 262 / 0.02 = 13100 g/mol

the molecular weight of bovine cytochrome c  = 13100 Da

when one residue is N terminal and one is non-terminal

N- terminal eliminate 'OH' group and non-terminal eliminate H2O group

mass of residues = (2*149) - 18 - 17 = 263 g

mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100

2 = ( 263 / mass of bovine cytochrome c ) *100

0.02 = 263 / mass of bovine cytochrome c

mass of bovine cytochrome c = 263 / 0.02 = 13150 g/mol

the molecular weight of bovine cytochrome c = 13150 Da

when one residue is C terminal and one is non-terminal

C- terminal eliminates the 'H' group and non-terminal eliminates the H2O group

mass of residues = (2*149) - 18 - 1 = 279 g

mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100

2 = ( 279 / mass of bovine cytochrome c ) *100

0.02 = 279 / mass of bovine cytochrome c

mass of bovine cytochrome c = 279 / 0.02 = 13950 g/mol molecular weight of bovine cytochrome c = 13950 Da

taking average all this = (14900 + 13100 + 13150 +13950) / 4 = 55100/4 = 13775 Da

The average molecular weight of bovine cytochrome c = 13775 Da

rounding off to three significant figures

The averages molecular weight of bovine cytochrome c = 13800 Da.

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Answer:

alpha particle

Explanation:

I'm pretty sure it's supposed to be "daughter", but I see that it's not a choice so my second best choice would be alpha particle

The MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).

The expression crime scene refers to all evidence found in a given place after a crime, which is fundamental to solving this type of police case.

In conclusion, the MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).

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The amount in moles of iron (II) oxalate that has a mass of 1.685 grams is 0.01170mol.

The number of moles in a substance can be calculated by dividing the mass of the substance by the molar mass.

According to this question, a student isolates 1.685 grams of iron (II) oxalate (FeC₂O₄).

Molar mass of FeC₂O₄ = 56 + 12(2) + 16(4) = 144g/mol

no of moles = 1.685g ÷ 144g/mol = 0.01170mol

Therefore, the amount in moles of iron (II) oxalate that has a mass of 1.685 grams is 0.01170mol.

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Answer:

0.20

Explanation:

Molarity= no of moles/volume in litre

=5/25

= 0.20M

The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.

Periodic table is defined as a table consist of chemical elements contains a series of atomic number generally in rows due to the reason that elements possesses same atomic number lie in the vertical columns.

Therefore, The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.

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The concentration of this solution is 1.506 mole

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.

Here given data is a solution of 0.250 M NaCl. If you boil away 2/3 of the volume of water  

We have to calculate concentration of this solution = ?

2/3 of the volume of water is 2/3×0.250 = 0.1666

Concentration = mass of solute dissolved/volume

Concentration = 0.250 M/0.1666

Concentration = 1.506mole

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2 moles of sodium hydroxide are required to react with 1 mole of sulfuric acid.

Stoichiometry refers to the relation which exists between quantities of reactant and products.It is based on the law of conservation of mass where the mass of the reactants is equal to the mass of the products.Conclusion which can be made by this statement is that reactants and products form a ratio of positive integers.

Considering the reaction between sodium hydroxide and sulfuric acid given in the question number of moles of sodium hydroxide can be found out that are required to react with 1 mole of sulfuric acid using stoichiometry concept.

H₂SO₄+2 NaOH[tex]\rightarrow[/tex]Na₂SO₄+ 2 H₂O

From the reaction it is clear that 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide

Therefore,1 mole of sulfuric acid would react with

1×2/1=2 moles of sodium hydroxide.

Thus, 2 moles of sodium hydroxide react with 1 mole of sulfuric acid.

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Hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.

Hydrogen is the chemical element with the symbol H and atomic number    of  one (1).

Yes hydrogen is explosive. When hydrogen mixes with oxygen in the air, it forms an explosive mixture.

When molecular hydrogen and oxygen are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.

The reaction equation is given as;

H₂ + O₂ →  H₂O₂ + heat

This reaction is exothermic because it releases large amount of heat to the surrounding.

Thus, hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.

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The number of CT scans that a patient will have to undergo in order to feel mild radiation sickness would be 72 CT scans

The normal dose CT scan delivers 700 mrem.

700 mrem = 700 x [tex]10^{-3}[/tex] rem

700 x [tex]10^{-3}[/tex] rem is equivalent to 0.7 rem.

In order for a patient to feel mild radiation sickness, 50 rem is needed.

If 1 CT scan is equivalent to 0.7 rem, then how many CT scans will give 50 rem?

           = 50 x 1/0.7

                    = 71.429 scans

Since CT scans cannot be a fraction, we then need to approximate to the nearest whole number.

Thus, a total of 72 CT scans will be required for a patient to have a feeling of radiation sickness.

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The density of the sulfuric acid is 1.840 g/ml.

Given,

Mass of sulfuric acid = 6.514 × 10 g

Volume of sulfuric acid = 3.54 × 10 ml

We have to find the density of the sulfuric acid.

The density of any substance is defined as the mass per unit volume of the substance. Or, it is the ratio of mass to volume. The units of density are kg/m³, g/ml, or g/cm³.

It is given by the formula:

Density = Mass/ volume

Density = 6.514 × 10 g/ 3.54 × 10 ml

Density = 1.840 g/ml

Hence, the density of sulfuric acid is 1.840 g/ml

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The volume of the ethanol in quarts is determined as 3.04 quarts.

The mass of the ethanol is calculated as follows;

volume of the ethanol = mass of the ethanol / density of the ethanol

5 pounds = 2267.96 g

volume of the ethanol = (2267.96 g) / (0.789 g/mL)

volume of the ethanol = 2,874.47 mL

1 mL = 0.00105669 quart

2,874.47 mL = ?

=  2,874.47 mL x 0.00105669 quart/mL

= 3.04 quarts

Thus, the volume of the ethanol in quarts is determined as 3.04 quarts.

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Answer:

the answer is d the nucleus

Explanation:

the nucleus is like in the middle of a cell and I think is the most important.

hope this helps :)

how many there are of each element for example H20 is 2 hydrogen atoms plus 1 oxygen atom

The distance between them is 2.5 m.

Now we know that the Newton's law of gravity said that the gravitational force of attraction between two objects is directly proportional to the product masses of the objects and inversely proportional to the distance of separation.

Now, given that;

F = Gm1m2/r^2

F = gravitational force

G = gravitational constant

m1 = mass of the book

m2 = mass of the lamp

r = distance of separation

r = √ Gm1m2//F

r =  √6.67 * 10^-11 * 4 * 7/2.99 10^-10

r =2.5 m

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Missing parts;

A 4 kg book and a 7 kg lamp are both in the living room. If the force of gravity between them is 2.99 10-10 N, how far apart are they?

the relationship between turtles and barnacles is an example of

co-evolution, where each species is continually adapting to changes with  the other.

Barnacles attaches to  turtle's shell due to its hardness. Barnacles needs  a hard surface to bind with so that it can thrive. A single barnacle doesn’t harm a turtle. But excessive barnacles can make a turtle inactive,also impact its vision and make it difficult to eat, and sometimes lead to infection.

.The cyprid larvae of barnacle has a special attachment devices which allow it to hold onto the substrate, e.g. cup-shaped attachment organs on the antennae. Once barnacle is settled, the barnacle develops into an adult and attaches in different  ways as gripping the skin, cementing to the shell or boring into it.

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The property which is least helpful in identifying a sample of matter is option D. Volume.

Property including melting factor, boiling factor, density, solubility, color, odor, and so on. is bodily houses. residences that describe how a substance modifications identity to produce a new substance are chemical houses.

The reactivity of a substance is a chemical property as opposed to physical assets. The purpose qualifies as a chemical property as it is predicated on its electron configuration to decide how it's going to behave around different substances.

A matter is an attribute of depending this is unbiased its chemical composition. Density, color, hardness, melting and boiling points and electric conductivity are all examples of physical properties.

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Answer: D Volume

Explanation:

Electrophoresis can be defined as a molecular biology procedure to separate biomolecules depending on the weight and electrical charges.

Electrophoresis is a molecular biology procedure in which biomolecules such as DNA or proteins can be separated by their electrical charges and weight. For example, DNA has a negative charge thereby it migrates to the positive pole under an electrophoretic field and different DNA molecules can also be separated by their weight in base pairs.

In conclusion, electrophoresis is a technique used in molecular biology laboratories to separate biomolecules depending on the weight and electrical charges.

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The mass, in grams, of oxygen that will be produced from the reaction to two significant figures, will be 0.17 grams.

Mercury oxide decomposes to liquid mercury and oxygen gas. The equation for the decomposition reaction is represented below:

[tex]2HgO + heat --- > 2Hg + O_2[/tex]

Mole of 2.25 g mercury oxide = mass/ molar mass

                = 2.25/216.59

                       = 0.0104 moles

Mole ratio of mercury oxide that decomposes and oxygen gas produced = 2:1.

Equivalent moles of oxygen gas produced = 0.0104/2

                                 = 0.0052 moles

Mass of 0.0052 moles oxygen gas = mole x molar mass

                                 = 0.0052 x 32

                                         = 0.1664 grams

To 2 significant figures, the amount of oxygen gas produced is 0.17 grams.

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The forensic scientist  should collect the hair and place it in a bag as an evidence.

How does a hair help in crime study?

Hair analysis  is used as a tool widely for locating suspects in crime investigations.The hair possesses different characteristics which can be studied under a microscope which help in revealing a person's race, gender and color.

Considering if a person is poisoned, hair analysis can help in identifying the presence of poison in a the body.Although carrying out a blood test  after a certain period of time to detect presence of poison will give a negative result but hair analysis would not,it would definitely reveal the body being poisoned.

Hair samples collected along with hair follicles remaining intact are useful for DNA testing.This is because every cell has a nucleus  and is made up of chromosomes.The hair follicles contain DNA which provides useful information.

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It's true that there may be numerous starting points that a composer could use when writing a piece of music.

The composer may moreover start at a one-of-a-kind figure depending on the thoughts they've at that minute in time. In other expressions, it may be said that a vocalist or a guitarist is alluded to as a performer for that tally number. A composer is that as it may be an individual who sets a track to a song. Musical composition can talk about a unique piece or work of the track, both vocal or instrumental, the structure of a melodic piece, or the strategy of making or composing an unused piece of music. individuals who make modern compositions are alluded to as composers.

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The mass number for a carbon atom which contains 6 neutrons is 12.

Answer:

1 liter = 0.264172 us gallon

Explanation:

A sample of matter with both a definite and unchanging composition and specific chemical properties is referred to as a pure material.

A mixture is a substance comprised of two or more dissimilar chemicals that are not chemically linked.

Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) .

Materials

Pure substances and mixtures are the two broad categories into which matter can be divided. A sort of matter known as a pure substance has qualities and a steady composition throughout the sample. Physically combining two or more elements and/or compounds results in a mixture. The two types of mixtures are homogeneous and heterogeneous. Pure substances include both elements and compounds. Substances made up of multiple atom types are known as compounds. The simplest compounds are called elements because they only contain one kind of atom.

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The elements are organized in the periodic table By increasing the atomic number.

The periodic desk is organized into companies' vertical columns, intervals horizontal rows, and families organizations of factors that might be similar. factors in the identical institution have the same range of valence electrons. Dmitri Mendeleev created the periodic desk by using arranging his factors in order of growing atomic mass. He determined that when they have been organized in this manner they form a repeating sample that is periodically repeated every seven factors.

The chemical factors are organized so as of increasing atomic range. The horizontal rows are called intervals and the vertical columns are called agencies. factors within the equal institution have comparable chemical houses. this is due to the fact they have an identical range of outer electrons and identical valency. The vertical columns on the periodic desk are referred to as corporations or families due to their comparable chemical behavior. all of the participants of a family of elements have an equal number of valence electrons and similar chemical homes.

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