Some people rinse their freshly shampooed hair with diluted lemon juice or vinegar. Why is this done?

The chemical element that gives the blood of a lobster a bluish tint is copper.

The blue color of lobster blood is due to a copper-based molecule called hemocyanin. Hemocyanin serves a similar function to hemoglobin in vertebrates, which is to transport oxygen to the tissues.

In vertebrates, hemoglobin contains iron atoms that bind to oxygen, giving the blood a red color when oxygenated. However, crustaceans like lobsters have evolved a different mechanism for oxygen transport. Instead of using iron, they use copper to bind with oxygen molecules.

Hemocyanin molecules consist of protein chains called subunits, each containing copper atoms. When oxygen is present, it binds to the copper atoms in hemocyanin, forming a complex called oxyhemocyanin. This oxyhemocyanin complex gives the lobster blood a blue color.

The blue tint arises because copper absorbs light in the red part of the spectrum and reflects or transmits light in the blue region. This interaction between light and the copper-based molecule results in the characteristic bluish color of lobster blood.

Overall, the presence of copper in the hemocyanin molecule is responsible for the blue tint observed in the blood of lobsters and other crustaceans, allowing them to efficiently transport oxygen throughout their bodies in an oxygen-rich aquatic environment.

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After going through all the details given environment A is a rainforest so the correct option is "Rainforest".

Rainforest is the type of vegetation and it specializes because the amount of rain that it gets is very high as compared to the rest of the vegetation like swamps, deserts, or tundra.

Swamp and desert get some rain but they are not warm throughout the year and the rain that they get is also very less as compared to the rainforest.

Tundra on the other hand are generally cols with very limited rainfall throughout the year.

So in the question, we can see that desert, swamp, and tundra doesn't match the description of environment A which is given in the question that is, it is warm and gets a lot of rain. So the correct option is Rainforest.

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Answer: The mass number tells the number of protons.

Explanation:

The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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Answer:

Flatworms (Platyhelminthes) are acoelomates i.e. they lack a coelom. Molluscs and insects (Arthropoda) are coelomates as they have a true coelom derived from the germ layer mesoderm. Roundworms (Aschelminthes) are pseudocoelomates as the coelom is not derived from the mesoderm.

Earthworm is an invertebrate belongs to phylum Annelid. so it does not belongs to phylum aschelminthes​.

Phylum Aschelminthes is called as roundworms, their bodies appear circular,  approximately 15000 different types of roundworms are present.

These are pseudocoelomate, bilaterally symmetrical, triploblastic,  vermiform organisms having complete digestive system, commonly seen in soil, feed on bacteria.

These are also found in the human intestine, cause a disease called ascariasis, do not have a respiratory or circulatory system.

Some of the unique features are presence of Syncytial epidermis, Muscle layer of body wall, Pseudonym, complete digestive tract, unisexual in nature.

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The vanilla extract can be used in the house to;

Vanilla beans are steeped in ethyl alcohol and water to produce vanilla extract, an aromatic, amber-colored liquid. pure vanilla extract is gotten through macerating and percolating vanilla pods in an ethanol and water mixture, vanilla extract is created.

In many Western sweets, particularly baked goods like cakes, cookies, brownies, and cupcakes, as well as custards, ice creams, and puddings, it is seen as a necessary component.

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To calculate the standard cell potential (Eºcell) for the given electrochemical cell, we need to consider the half-cell reduction potentials for the species involved.

The cell diagram can be represented as follows:
Pt | Cr3+ (aq) || NO3- (aq), HNO2 (aq), H+ (aq) | Pt
We can identify the following half-cell reactions:
Reduction half-reaction at the cathode (left half-cell):
Cr3+ (aq) + 3e- → Cr(s) (Eº = -0.74 V)
Oxidation half-reaction at the anode (right half-cell):
NO3- (aq) + 4H+ (aq) + 3e- → NO(g) + 2H2O (l) (Eº = 0.20 V)
To calculate the overall cell potential, we subtract the reduction potential of the anode reaction from the reduction potential of the cathode reaction:
Eºcell = Eºcathode - Eºanode
Eºcell = -0.74 V - 0.20 V
Eºcell = -0.94 V
Therefore, the standard cell potential (Eºcell) for the given electrochemical cell is -0.94 V.

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Answer:

answer on what no file attached

Explanation:

Answer:

Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there. first question Natural non-living things: They are found in nature and are not made by man. Examples: Sun, moon, stars, sky, clouds, rocks, mountains and many more. Man-made non-living things: They are made by man. Examples: Toys, chairs, tables, beds, houses, buildings, trains and many more. second question Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. The word "metamorphic" comes from Greek and means "To Change Form". third question. Sedimentary. fourth question and sorry I can't answer the last :(

Explanation:

According to the given statement if it started at the surface The ball's new volume is 0.48 L.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, notably Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a higher temperature) to a warmer (body with a lower temperature) (one at a lower temperature)

P1 = 752. 0 mmHg

P2 = 2943 mmHg

V1 = 2.00 L

V2 = X

(change to kelvin)

T1

= 20°c + 273

= 293 K

T2

= 0.245 °c + 273

= 273.245 K

V2, unknown

P1 V1 / T1 = P2 V2 / T2 is the equation.

Solution:

(2943 mmHg) (x) / 273.245 K

= (752.0 mmHg) (2.00 L) / 293 K

(2943 mmHg) (x) / 273.245 K is equal to (1504) / 293 K.

(Cross Multiply)

= (1504)(273.245K)/(293K)(2943mmHg) (x)

= 410 960.48 / 862 299 (x) 

X = 0.4765 L

V2 = 0.48 L

The ball's new volume is 0.48 L.

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The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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If 89.5 grams of silver is produced, 105.45 grams of Cu reacted.

The Chemical equation is

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

The equation is balanced,

89.5 grams of Silver is produced in the reaction.

It is asked that how much Cu will be produced.

The amount of Copper can be calculated by using mole concept,

From the reaction,

When 1 moles of Copper Reacts, 2 moles of Ag are formed.

So, we can say,

Mole of Cu (n) = 2 x Moles of Ag

Mole of a compound can be found by using the formula,

Moles = Given mass of compound/Molar mass of the compound

So,

n = 2 x 89.5/107.87  moles

n = 2 x 0.82 moles

n = 1.64 moles.

Moles of Copper are 1.64.

So, the mass of Cu reacted will be

1 mole Cu = 63.55 grams

1.64 moles Cu = 1.64 x 63.55 grams

1.64 moles of Cu = 105.45 grams.

To produce 89.5 grams of silver, 105.45 grams of Copper would have reacted.

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Answer:

Option A, 66.5

Explanation:

use q (heat) = m(mass) * cp(specific heat) * deltat (change in temp)

q= 1172, m = 45.8, cp = 0.385

1172= (45.8) * (0.385) * Delta T

1172= 17.633 *DeltaT

1172/17.633 =DeltaT

66.5 =DeltaT

The kind of intermolecular forces that act between an ethylene molecule and a neon atom are London dispersion forces.

London dispersion forces are a type of intermolecular force that occur between nonpolar molecules or atoms. These forces are caused by the temporary fluctuations in the electron density of the molecules or atoms, which create temporary dipoles. These temporary dipoles then attract or repel each other, creating the London dispersion forces.

In the case of an ethylene molecule and a neon atom, both are nonpolar, so they will experience London dispersion forces. These forces are relatively weak, but they are the only type of intermolecular force that can act between nonpolar molecules or atoms.

In summary, the intermolecular forces between an ethylene molecule and a neon atom are London dispersion forces, which are caused by temporary fluctuations in the electron density of the molecules or atoms.

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Each chiral center can have two possible configurations, R or S, giving a total of 2^2 = 4 possible stereoisomers for ephedrine. The answer is (d) 03, as there are three stereogenic centers present in ephedrine.

Ephedrine has two chiral centers, one at the carbon atom labeled as 1 in the following structure, and the other at the carbon atom labeled as 2.

       H              H

       |              |

H3C--CH(CH3)--OH--CH2--CH(NH2)CH3

       |              |

       H              OH

          (1)        (2)

Each chiral center can have two possible configurations, R or S, giving a total of 2^2 = 4 possible stereoisomers for ephedrine. Therefore, the answer is (d) 03, as there are three stereogenic centers present in ephedrine.

Ephedrine is a sympathomimetic amine commonly used as a bronchodilator and decongestant. It is a chiral molecule, meaning it has a non-superimposable mirror image. Ephedrine has one stereogenic center, which is the carbon atom attached to the two methyl groups (-CH3) and the hydroxyl group (-OH) in its chemical structure. Therefore, the answer is (b) 1 stereogenic center.

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Answer:

A: dependent variable

B: experimental group

C: independent variable

D: control variables

E: control group

Explanation:

Answer:

Metals are extracted form ores found in the earth's crust. An ore is a rock containing enough metal or a metal compound to make extracting it worthwhile. An example of its use in everyday life are plumbing pipes made of copper used in electrical wiring and heating systems. Copper is a good conductor of heat and electricity and is immune to corrosion.

Answer:

20 drops

Explanation:

Fuel-efficient cars help decrease the global dependency on nonrenewable resources because they use less fuel than other vehicles to travel the same distance.

Nonrenewable resources are natural resources that cannot be readily replaced or regenerated, such as fossil fuels (coal, oil, and natural gas), minerals, and some metals. These resources are finite and once they are used they cannot be replenished. They are formed over millions of years and are essential for the functioning of modern society, but their extraction and use can have negative impacts on the environment.

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All three elements  in the periodic table will for sure have characteristic of mass and volume.

An element  is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom which is characteristic of it's own. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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The given bond is polar covalent bond.

Polar covalent bonds are covalent bonds in which the electrons are shared unequally. Nonpolar covalent bonds are covalent bonds with an equal distribution of electrons. Chemists utilise electronegativity, a relative measurement of how strongly an atom attracts electrons as it forms a covalent connection, to assess the relative polarity of a covalent bond.

Polarity characterises io3-. If a molecule's dipole moment is greater than 0, it is considered to be polar. The three I-O bonds in this combination are polar due to the difference in electronegativity between the I and O atoms. The three I-O bond moments point toward I atom because I is more electronegative than O atom.

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Explanation:

(1) 1 m = 100 cm

1.45 m = 100 × 1.45 cm = 145 cm

(2) 1 kg = 1000 g

325 g = 0.325 kg

(3) 1 L = 1000 mL

0.0024 L= 2.4 mL

(4) 1 km = 1000 m

\(1.55\times 10^4\ m=1.55\times 10^4\times 0.001=15.5\ km\)

(5) 1 mm = 0.001 m

\(4.75\times 10^{-2}\ m=4.75\times 10^{-2}\times 1000\ mm\\\\=47.5\ mm\)

(6) 1 kg = 100000 cg

0.459 kg = 45900 cg

(7) 1 dm = 10⁻⁴ dm

5,995 dm = 5,995 × 10⁻⁴ km

(8) 1 g = 1000 mg

450 g = 450000 mg

(9) 1 dm = 100 m

0.003 dm = 0.3 mm

(10) 1 mL = 0.001 l

4.567 × 10⁴ mL = 45.67 L

Answer:

I believe the answer is A

Explanation:

Work and energy are related because when you work, you cause displacement in the object you are exerting upon. While this happens, you transfer energy between the systems. Both work and energy share the same SI unit, called the joule.

Answer:

The flame will burn out

Explanation:

The oxygen will be kept out of the jar, without oxygen the flame cannot last long. The flame will eventually burn out. Nitrogen gas has no role to play in the burning. Nitrogen slows down the burning rate.

Given that the volume and mass of a substance are not defining properties, it is entirely possible for two samples with different volumes and mass to be the same substance.

Therefore, since the volume and mass of a substance are not defining properties of a substance, we can confirm that it is entirely possible for two samples with different volumes and mass to be the same substance.

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Answer:

243.05 gm of Fe2O3

Explanation:

From periodic table   mole wt of Fe = 55.845 gm

  170 g / 55.845 gm/mole = 3.044 moles  Fe

From equation

 4 Fe ====> 2 Fe2 O3

      so 1/2 as many moles  as Fe    3.044 / 2 = 1.522 moles of Fe2O3

             mole wt of Fe2 O3   from periodic table = 159.687 gm/mole

                       1.522 moles * 159.687 gm/mole = 243.05 gm

How many moles of tungsten atoms are in 4.8 * 10^25 atoms of tungsten?

Avogadro's number is the number of particles that we have in one mol of particles. It is 6.022 *10^23. For example: in 1 mol of atoms there are 6.022*10^23 atoms.

It's like a dozen. When we say a dozen atoms, we mean 12 atoms. So, when we say a mol of tungsten atoms, we mean 6.022 *10^23 atoms of tungsten.

1 mol of atoms of tungsten = 6.022 *10^23 atoms of tungsten

We will use that relationship to find the number of moles of tungsten atoms that we have in 4.8 *10^25 atoms of tungsten.

number of moles of tungsten atoms = 4.8 *10^25 atoms * 1 mol of atoms/(6.022 *10^23 atoms)

number of moles of tungsten atoms = 79.7 moles = 8 *10^1 moles

number of moles of tunsten atoms = 8.10^1 moles

Answer: b) 8*10¹ moles

Answer: False

Explanation:

In a true solution, the particles will not eventually settle to the bottom of the solution due to the fact that it is homogenous. Imagine getting a fountain soda at a restaurant and leaving the drink alone. No matter how long you wait, the sugar in the soda isn't going to settle at the bottom of the cup.

False In a true solution, the particles will not eventually settle to the bottom of the solution due to the fact that it is homogenous. Imagine getting a fountain soda at a restaurant.

and leaving the drink alone. No matter how long you wait, the sugar in the soda isn't going to settle at the bottom of the cup. The solute particles in a genuine solution are equally scattered and do not sink to the bottom of the solution. A genuine solution is a homogenous mixture in which the solute particles are so thoroughly dissolved in the solvent that they cannot be seen or separated mechanically. A genuine solution has equally dispersed solute particles throughout it, giving it a homogeneous appearance and content. ettle at the bottom of the cup. The solute particles in a genuine solution are equally scattered and do not sink to the bottom.

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