Be sure to answer all parts.
What is the concentration in parts per million of DDT in each of the following?
a. 3 x 10^-4 g in 2.3 kg minnow tissue
Ppm DDT
b. 717 µg in 1.5 kg breast milk
ppm DDT

Answer:

1.25*10^24 atoms with sig figs

Explanation:

To find the number of atoms, an easy way to do this would be to convert the mass to the number of moles, then convert moles to the number of atoms.
There are 40.08 grams of calcium per mole, so 83.4 grams of calcium would have 83.4/40.08 moles of calcium, or about 2.081 moles of calcium
Each mole of something contains about 6.022*10^23 of that something, so 2.081 moles of calcium atoms would equal 2.081 *(6.022*10^23) atoms. 2.081 *(6.022*10^23) equals 1.25*10^24, so there would be 1.25 * 10^24 atoms in 83.4 grams of calcium

Ancient Martian riverbed channels were formed by molten lava rather than by liquid water.

Flowing lava can carve and carve paths like water-eroded riverbeds and canyons, and could explain at least one of the winding channels on Mars' surface. Many waterways on Mars were carved by water, but not all. Lava can also flow, creating features similar to stream channels. However, lava functions in many different ways.

Scientists have known since the Mariner 9 mission in 1972 that volcanic structures cover most of the surface of Mars. These features include vast lava flows, vast lava plains, and the largest known volcanoes in the solar system. Massive torrents of water carry rocks and rocks torn from upstream springs. These scratch and abrade the canal floor, creating long lines that floodwaters can wash away and expand.

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The theoretical mass of NaCl would result from reacting 3.0 moles of NaHCO3 with excess HCI is 175.32 g.

This problem is solved by using the concept of moles:

Mole is a term which is defined as a ratio of theoretical mass of compound to the molar mass of compound.

Mathematically,

Moles = given mass/molar mass

Molar mass of NaCl = 58.44 g/Mol

Now we have to calculate the moles of NaCl

[tex]NaHCO_{3} + HCl = > NaCl + H_{2}O + CO_{2}[/tex]

From the chemical equation, we noticed that moles of NaHCO3 is equal to moles of NaCl.

Since moles of NaHCO3 = 3

Therefore, moles of NaCl = 3

Now, by substituting all the values, we get

Theoretical mass of NaCl = 3 x 58.44 = 175.32 g

Thus we concluded that the theoretical mass of NaCl would result from reacting 3.0 moles of NaHCO3 with excess HCI is 175.32 g

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The net ionic equation of the reaction as it is shown have been given here by the equation; [tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]

The term net ionic equation has to do with the equation that shows the manner in which we are able to convey the information that concerns the ions that do not undergo a change in the reaction.

In this case, we have the reaction that occurs between ammonium chloride and copper II acetate which would produce a copper I chloride and an ammonium acetate product. The net ionic equation would now be;

[tex]Cu^+(aq) + Cl^-(aq) ---- > CuCl(s)[/tex]

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The option that best represent the depiction of the Closeup of a glass windshield is option A: trace evidence

In paper bindles, coin envelopes, pill boxes, or film cans that can be tagged and completely sealed, place the little glass pieces before placing them in the last. Put big glass pieces in boxes. Use cotton or tissue to cushion individual pieces while shipping to avoid breakage and damaged edges.

Note that the field of forensic science known as "trace evidence analysis" focuses on the minute transfers of materials that are invisible to the unassisted eye.

Hence, Trace evidence must be handled carefully and analyzed using specialist methods.

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The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.

Considering the question given above, the following data were obtained:

Empirical formula is CH₂O

Molar mass of compound = 150 g/mol

Scaling factor (n) =?

Empirical formula × n = molar mass

[CH₂O]n = 150

[12 + (2×1) + 16]n = 150

[12 + 2 + 16]n = 150

30n = 150

Divide both sides by 30

n = 5

Therefore, the scaling factor is 5

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Answer:

The scale factor is 5. The formula is CH2O.

Multiply each by 5.

So:

C (there is only one)= 1×5

H (there are 2)= 2×5

O(there is only one)= 1×5

Equalling= C5H10O5

Taking into account the definition of density, the length of each side of the cube is 4 cm.

In other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

2 g/cm³= 128 g÷ volume

Solving:

2 g/cm³× volume= 128 g

volume= 128 g÷ 2 g/cm³

volume= 64 cm³

The volume of a cube is equal to the measure of its side to the cube. That is to say:

Volume = side x side x side = side³

So, the length of each side of the cube can be calculated as:

64 cm³= side³

∛64 cm³= side

4 cm= side

In summary, each side of the cube has a measure of 4 cm.

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The standard potential for the galvanic cell at 25°C is 1.98 V.

A galvanic cell or an electrochemical cell is a cell that converts the chemical energy of the reactions occurring within it to electrical energy.

The galvanic cell is able to convert chemical energy to electrical energy as a result of the redox reactions occurring within the cell.

The standard potential for the given galvanic cell at 25°C is calculated as follows

Standard reduction potentials:

Ti³⁺ + 3e⁻ ---> Ti; E° = − 1.21 V (anode)

Fe³⁺⁺+ e⁻--> Fe²⁺ ; E° = 0.77 volts (cathode)

Eºcell = 0.77 V - (-1.21 V)

Eºcell = 1.98 V

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Answer: Between non-metals

Explanation:

Answer:

Condensation

Explanation:

We can see that H2O is formed when the two molecules join together, which is a characteristic of Condensation polymerization

The ratio of the carbon to other atoms would be 2.49375:3.9901:1.000 and the empirical formula of the compound would be  [tex]C_2H_8O[/tex]

The compound contains C, H, and O according to the following information:

C = 4.9875 mol

H = 7.9802 mol

O = 2.00 mol

In order to obtain the empirical formula of the compound, divide the mol of each atom by the smallest mol. In this case, the smallest mol is 2.00

C = 4.9875/2.00

  = 2.49375

H = 7.9802/2.00

    = 3.9901

O = 2.00/2.00

   = 1.0000

Thus, the ratio of carbon to the rest of the atoms present in the compound is 2.49375:3.9901:1.000

In order to find the empirical formula of the compound, the mole of each atom needs to be approximated to the nearest whole number.

C = 2

H = 8

O = 1

Thus, the empirical formula of the compound is [tex]C_2H_8O[/tex].

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Answer:

V2 = 0.075 L

Explanation:

P1= first pressure 

P2= second pressure 

V1= first volume 

V2= second volume 

P1V1 = P2V2=
(0.20 atmospheres)(15 L) = (40 atmospheres)V2=

V2 = (0.20 atmospheres)(15 L)/(40 atmospheres)=

V2 = 0.075 L

The volume occupied by the given mass of iron is 0.83 [tex]cm^{3}[/tex].

The term specific gravity has to do with the ratio of the density of an object to the density of water. We must note that density of water is the bench mark that have been used to obtain the densities of every other substances hence it was assigned a density of 1.00 g/ [tex]cm^{3}[/tex].

Now we know from the question that;

Density of water =  1.00 g/ [tex]cm^{3}[/tex]

Specific gravity of iron = 7.87

Mass of the iron = 6.50 g

Density of iron = Specific gravity * density of water =  7.87 * 1.00 g/ [tex]cm^{3}[/tex]

=   7.87 g/ [tex]cm^{3}[/tex]

Given that;

Density = mass/volume

volume = mass/Density

volume = 6.50 g/7.87 g/ [tex]cm^{3}[/tex]

Volume = 0.83  [tex]cm^{3}[/tex]

We can see that from the calculations, the density of the iron as is clear in the procedure is 7.87 g/cm3  and it has a volume of 0.83 cm3 .

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Answer:

Surface tension due to cohesion

Explanation:

Water molecules are polar meaning they have dipoles. The hydrogen end is partially positive while the oxygen end is partially negative. This is because oxygen with high atomic mass attracting most of the molecule's electron cloud to its end.

Due to this phenomenon water molecules act like little magnets that attract each other. The attraction of the molecules forms hydrogen bonds with each other. This is called cohesion (attraction of similar molecules).  Due to this, water is able to create a surface tension that acts like a ‘skin’ and can support some weight (including its own weight) without collapsing.

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Answer:

Cohesion of water

Explanation:

cohesion means sticking together so Before it overflows, the water forms a dome-like shape(rounded) above the rim of the glass. This dome-like shape forms due to the water molecules' cohesive properties, or their tendency to stick to one another.

Answer: -207936x>112+2x+83

The nuclear equation for the Alpha decay of a radioactive Radium-226 isotope is ²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He

The sun of the mass numbers of the reactant equal the sum of the mass numbers of the product and radium 226 decay by alpha particles radiation to an inert gas and radon 222 which also decay by alpha particle radiation and due to the short half life of radon 222 there is high probability it will decay in the body and alpha particle is a helium nucleus it contain 2 proton an 2 neutron foe mass number of 4 and during alpha decay an atomic nucleus emit an alpha particles and it transform into an atom with atomic number 2 less and mass number 4 less

And the radium 226 decay through alpha particles emission to form radon 222 according to the equation ²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He

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Thus, radium-226 decays through α-particle emission to form radon-222 according to the equation:

The product of this reaction using inorganic by-products using H2/Lindlar's catalyst is cis-2-butene.

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Taking into account the definition of Ideal Gas Law, the volume of the container, the pressure of the gas, the number of gas particles, and the temperature of the gas are related by the Ideal Gas Law.

An ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law:

P×V = n×R×T

where:

In summary, the volume, the pressure, the number of gas particles, and the temperature are related by the Ideal Gas Law.

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Radiation is produced when unstable or radioactive atoms through the process of becoming stable. We refer to this process as radioactive decay over time. Two protons and two neutrons are lost from the nucleus as a result of alpha decay.

An unstable nucleus releases radiation and changes into the nucleus of one or more additional elements during a nuclear decay process, also known as radioactive decay.

The ensuing offspring nuclei are less energetic and heavier than the parent nucleus that underwent decay, making them more stable.

For example, by producing an alpha particle, the unstable uranium-238 nucleus naturally decays into a thorium-234 nucleus. The most prevalent radioactive decay processes are decay, emission, decay, positron emission, and electron capture.

Thus, Radiation is produced when unstable or radioactive atoms through the process of becoming stable.

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This isn't chemistry but I believe the answer is D, before a suspect in custody is questioned.

Hope this helped.

Answer: D

Explanation:

The electron configuration of O₂ is 1s² 2s² 2p⁴.

Electron configuration can simply be defined as the arrangements of electrons of atoms of elements in the orbitals or electrons shells. In order words, it simply means putting the electrons in order from the smallest orbital or shell to the biggest one.

That being said, from the task given above, the atomic number of oxygen is 8, meaning that if we are put down, the electron configuration of oxygen, we will have to distribute 8 electrons around its orbitals. An atom simply means the smallest particle of an element which can take part in a chemical reaction. An element is a substance which cannot be splitted into simpler forms by ordinary means.

So therefore, we can now confirm and deduce from the explanation above that electron configuration of the oxygen atom or element is the distribution of electrons around its orbitals.

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Answer:

below

Explanation:

From periodic table this is dysprosium

Answer:

True. When chemists experiment with clinical drugs, they may inadvertently create new side effects that were not present in the original drug. Additionally, the new drug may interact with other drugs in unexpected ways, which can also create new side effects.

In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.

In the silicon dioxide the total number of covalent bond is four between the each silicon atom with the oxygen atoms. The covalent bond is form when the two atoms mutually share the electrons and bond together. the compound which form covalent bond is called as covalent bond. the silicon dioxide form covalent bond because the electronegative difference between silicon and the oxygen is not much.

Thus, In silicon dioxide the number of the covalent bonds are there between each silicon atom with oxygen atoms is four.

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The mass of water is consumed by the reaction of 8.86 g of carbon dioxide is 3.62 g.

The balanced chemical equation for photosynthesis is given by:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Therefore, from the above reaction it is clear that 6 moles of carbon dioxide and 6 moles of water combines to produce 1 mole of glucose sugar and 6 moles of oxygen.

The molar mass of carbon dioxide is 44.01 g/mol.

Therefore, the number of moles of carbon dioxide in 8.86 g of CO₂ is :

Number of moles of CO₂ = (8.86 g) ÷ (44.01 g/mol )

                                          =0.201 moles

From the balanced chemical equation 6 moles of water is consumed with CO₂.

Number of moles of water = 6moles H₂O ÷ 6moles CO₂ × 0.201mol CO₂

                                             = 0.201 mol

The molar mass of water is 18.01 g/mol.

Therefore the mass of water consumed is :

Mass of water = Number of moles of water × Molar mass of water

                        = 0.201 mol × 18.01 g/mol

                        = 3.62 g

Hence, the mass of water is consumed by the reaction of 8.86 g of carbon dioxide is 3.62 g.

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The true statement is that 363 kJ of heat is evolved in the process.

We know that a reaction has to do with the combination of the reactants in order to yield the products. We can see the thermochemical balanced reaction equation of the process as it was written in the question. A thermochemical equation is the type of equation that includes the energy that is absorbed or evolved in the reaction equation.

Now we can see that the reaction shows the combination of hydrogen and oxygen to give two molecules of water. This is a gas phase reaction and heat is given out according to the thermochemical reaction equation.

From the reaction equation;

If 2 moles of hydrogen evolves 484 kJ of energy

1.5 moles of oxygen evolves  1.5 moles *  484 kJ /2 moles

= 363 kJ

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Answer:

A). Water

PLEASE GIVE BRAINLIEST THANK YOU!!!

Answer:

water

Explanation:

The element selected is carbon and the isotopes are carbon-12, carbon-13, and carbon-14.

The number of protons, electrons, and neutrons for each isotope of carbon are as follows:

The isotope notation for each is¹²₆C, ¹³₆C, and ¹⁴₆C.

The carbon-14 isotope is used in the radioactive dating of substances.

Isotopes are atoms of the same element that differ from each other in their masses.

Isotopes of the same element have different masses as a result of the difference in the number of neutrons in the nucleus of the atoms of the element.

The existence of isotopes of elements accounts for why the atomic masses of elements are not whole numbers.

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83.246 ounces of silver is required to make the silver figure.

It is given that 10.49 g/cm^3 is the density of silver at Room temperature and the volume of Silver is 225cm^3.

To prepare silver of 225cm^3 of volume, we require the following:

Density = Mass/Volume

Mass = Density x Volume

Amount of silver = 10.49x225

Amount of silver = 2360.25 g

We know that,

100g = 3.5274 ounces

Then,

= 3.5274/100

= 0.035274 ounces of silver.

The mass of silver required in ounces = 2360.25 x 0.035274

The mass of silver in ounces = 83.246 ounces.

Therefore the mass of silver needed in ounces is 83.246 ounces. Through this conversion, the amount of any substance can be converted from kilograms to ounces.

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