Anlamadim yardım edin acil

Answer:

1. Melting

2. Freezing

3. Sublimation

4. Deposition

5. Condensation

6. Evaporation

1, 3, 6 are endothermic processes

O2- Option B is correct

Explanations:

Calcium atom is a group 2 elements that gives out two electrons in order to form a stable configuration and a Ca2+ ion. These two electrons are transferred to an atom that required two electrons to complete its outer shell.

Since oxygen required 2 electron to attain its octet configuration, hence they can easily accepts the two electrons from calcium atoms to form CaO which is composed of Ca2+ and O2- ions in the ratio of one Ca2+ ion to one O2− ions.

Answer:

Yall are coming after that person above me when theres no diagram!!!! HELLO????????????? crazy

Explanation:

Calculating this equation will give us the average translational kinetic energy of one molecule in the given ideal gas at 97.3°C.

To determine the average translational kinetic energy of a molecule in an ideal gas, we can use the equation:

E = (3/2) * k * T

Where:

E is the average translational kinetic energy

k is the Boltzmann constant (k = 1.380649 × 10^−23 J/K)

T is the temperature in Kelvin

First, let's convert the temperature from Celsius to Kelvin by adding 273.15:

T = 97.3°C + 273.15 = 370.45 K

Now we can calculate the average translational kinetic energy:

E = (3/2) * k * T

= (3/2) * (1.380649 × 10^−23 J/K) * (370.45 K)

T = 97.3°C

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The protons in an atomic nucleus are approximately 2.05 picometers apart.

To find the distance between the protons, we can use Coulomb's law, which relates the force between two charged particles to their charges and the distance between them.

Coulomb's law equation:

F = k × (q1 × q2) / r²

where: F is the force between the protons,

k is the electrostatic constant in the atomic nucleus (8.99 x 10⁹ N m²/C²),

q1 and q2 are the charges of the protons (both equal to the charge of a proton, 1.6 x 10⁻¹⁹ C),

r is the distance between the protons (what we want to find).

Rearranging the equation to solve for r:

r = √((k × q1 × q2) / F)

Substituting the given values:

r = √((8.99 x 10⁹ N m²/C² × (1.6 x 10⁻¹⁹ C)²) / 84 N)

r ≈ √(4.19 x 10⁻²⁹ m² / N)

Calculating the square root and converting the result to picometers (1 m = 10¹² pm):

r ≈ √(4.19 x 10⁻⁴¹ m²) ≈ 2.05 x 10⁻²¹ m ≈ 2.05 x 10⁻⁹ pm ≈ 2.05 pm

Therefore, the protons are approximately 2.05 picometers apart.

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Answer:

18.3%

Explanation:

Add the numbers together, and then take the number of grams of the substance, in this case copper, not coppper lol. divide the .45 by 2.45 to get 18.3

The order of cell in the erythrocyte developmental pathway are-

proerythroblast

erythroblast

normoblast

reticulocyte

erythrocyte

An early erythropoiesis cell is known as a proerythroblast. It serves as the erythroblast's progenitor cell (or normoblast). Sometimes, pronormoblast and proerythroblast are used interchangeably. Yet, a definition of a proerythroblast that incorporates both a pronormoblast and a promegaloblast would be more exact.

The most prevalent form of blood cell, also known as red cells, red blood corpuscles, haematids, erythroid cells, or erythrocytes, is a vertebrate that uses blood flow through its circulatory system as its primary method of supplying oxygen to its body tissues.

An early erythropoiesis cell is known as a proerythroblast. It serves as the erythroblast's progenitor cell (or normoblast). Sometimes, pronormoblast and proerythroblast are used interchangeably. A definition of a proerythroblast that incorporates both pronormoblast and promegaloblast would, however, be more exact.

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Explanation:

Speed = Distance/Time

Distance = 36m

Time = 13s

speed = 36/13

= 2.769 m/s

The solubility (in grams per liter) of magnesium fluoride in 0. 013 M sodium fluoride, NaF is 6.5 x 10⁻⁹ g/L.

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal that is a member of the alkali group of elements. Sodium is essential to the human body and is a major component of many minerals and salts. It is used in many industrial processes, such as in the production of glass, paper, and textiles, and is also used in the production of certain medical treatments and medicines.

The solubility of MgF₂ in 0.013 M sodium fluoride solution is calculated using the expression:

Ksp = [Mg²⁺][F⁻]2

[Mg²⁺] = [F⁻]2 x Ksp

[Mg²⁺] = (0.013)2 x 7.1 x 10⁻⁹

[Mg²⁺] = 1.05 x 10⁻¹⁰ M

The solubility of MgF₂ in 0.013 M sodium fluoride solution is then calculated as follows:

Solubility (g/L) = [Mg²⁺] x Molar mass of MgF₂

Solubility (g/L) = 1.05 x 10⁻¹⁰ x 62.3

Solubility (g/L) = 6.5 x 10⁻⁹ g/L

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Answer:

blank space one- 0

blank space two- 0

Explanation:

Answer:

The Sun's energy is transferred as both light and heat energy, that raises the temperature of an area receiving the Sunlight. The increased temperature results in the evaporation of water from surfaces and water bodies, such that the mass of water vapor rises up into the atmosphere and condenses when it gets away from the ground heat to the cooler and higher altitudes

When there is a situation of low pressure, the wind blows into the low pressure, where, in the equator, comprises of high temperature air which could contain considerable amount of vapor from the neighboring water bodies, resulting in the eventual rise of very moist air, up into the atmosphere, that condenses at low temperature at the high altitudes, accumulate into larger masses of liquid water, and fall as rain

Explanation:

Answer: hydrogen + oxygen Right arrow .water

Explanation:

The exact equation for this reaction is;

2H2  +  O2 ------------->   2H2O

hydrogen + oxygen Right arrow. water is the correct option.

The equation shows hydrogen reacting with oxygen to form water is as follows:-

\(2H_2+O_2\rightarrow2H_2O\)

The above reaction in word form is written as follows:-

\(hydrogen+Oxygen \rightarrow water\)

So, hydrogen + oxygen Right arrow. water is the correct option.

Hydrogen-H

Oxyden-O

Water-\(H_2O\)

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Answer: blowing a balloon is a physical change as when you blow a balloon the balloon expands but the balloon remains a balloon .there is change in Blowing a balloon is a physical change because only the size of the balloon changes , no change in chemical properties of the balloon occurs (no new substance is formed).

Explanation:

Answer:

7.2 x 10^23

Explanation:

Currently in Chemistry class

The molarity of the HCl solution is approximately 0.390 M.

To find the molarity of the HCl solution, you can use the formula:

Molarity of acid(M2) x Volume of acid(V2) = Molarity of base(M1) x Volume of base(V1)

Molarity of acid(M2) = (Molarity of base(M1) x Volume of base(V1)) / Volume of acid(V2)

Therefore,

M1V1 = M2V2
where M1 and V1 are the molarity and volume of NaOH, and M2 and V2 are the molarity and volume of HCl.

Given:
M1 = 0.212 M (NaOH)
V1 = 25.0 mL (NaOH)
V2 = 13.6 mL (HCl)

You need to find M2 (molarity of HCl).

Step 1: Rearrange the formula to solve for M2:
M2 = (M1V1) / V2

Step 2: Plug in the given values:
M2 = (0.212 M * 25.0 mL) / 13.6 mL

Step 3: Calculate the result:
M2 ≈ 0.390 M

So, the molarity of the HCl solution is approximately 0.390 M.

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Answer:

\(75\ \text{g}\)

Explanation:

t = Time = 180 years

\(t_{1/2}\) = Half-life of titanium = 60 years

\(N_0\) = Initial amount of titanium = 600 g

We have the relation

\(N=N_0e^{-\lambda t}\\\Rightarrow N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=600e^{-\dfrac{\ln 2}{60}\times 180}\\\Rightarrow N=75\ \text{g}\)

The mass that is left after 180 years is \(75\ \text{g}\).

Answer:

2H2+ 02-->2H20

So 4H2 + 202-->4H20

so the answer is 4 water molecules.

1. D. Absorbing excess carbon dioxide in the atmosphere

2.C. Abnormal warming of the earth

3.D. Organisms in the converted forest areas will lose their natural habitats.

4.D. Tropical rainforests have important functions in the ecosystem

5.C. Loss of habitat of many marine creatures

6.B. Use of sodium cyanide in fishing

1. The important roles of tropical rainforests in the earth's environment: Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and increasing local humidity.

2. If all trees were cut down and burned, the forest's carbon storage capacity would be lost to the atmosphere.

3. The most common pressures causing deforestation and severe forest degradation are agriculture, unsustainable forest management, mining, infrastructure projects and increased fire incidence and intensity.

4. Need to conserve and protect tropical rainforests: The most important function of forests is that it produces mass amounts of oxygen as a by-product of photosynthesis. ... Forests also prevent soil erosion and keep soil pollution in check.

5. If coral reefs are destroyed: Sea life has the most to lose. Coral reefs cover less than 1% of the ocean floor. But, they provide an essential ecosystem for a quarter of all marine life.

6. Pollution, overfishing, destructive fishing practices using dynamite or cyanide, collecting live corals for the aquarium market, mining coral for building materials, and a warming climate are some of the many ways that people damage reefs all around the world every day.

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Answer:

Group B

Explanation:

The control group of an experiment is considered to be the "normal" because it does not receive the expeiemental treatment and hence is used to compare with the experimental group. The control and experimental groups are similar in every other aspect with the exception of the "INDEPENDENT VARIABLE". The independent variable is not changed in the control group.

In this experiment, the control group is GROUP B, which was given a plain gatorade without adding sugar. Sugar is the independent variable here, and it was not included in GROUP B, meaning that GROUP B is the CONTROL GROUP. On the other hand, the experimental group is the GROUP A.

The reaction between chromate ester and water is a part of a huge and consecutive reaction called Jones reaction.

In this reaction, alcohol is converted to chromic acid in presence of jones reagent, chromic acid is further converted to chromate ester.

Now the obtained chromate ester has one or more unstable alpha hydrogens and in presence of basic species like water it yields an aldehyde or ketone as the organic product.

                                  O                                    O

                                   ll                                     ll

R--R'CH--OH + H-O--Cr--OH  ---->  R-R'CH-O-Cr--OH  +H₂O

                                  ll                                      ll

                                 O                                     O

Alcohol                Chromic acid               chromate ester

Further, let us understand the reaction of chromate ester with water with an example:

                    O                                                  O

                     ll                                                  ll

(CH₃)CHO---Cr---OH  + H₂O ---->(CH₃)CO + Cr--OH   +H₃O⁺

                    ll                                                  ll

                   O                                                  O

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The molarity of the solution is 0.33 M.

To calculate the molarity, you need to divide the moles of solute by the volume of the solvent in liters. In this case, you have 2.0 moles of solute and 6.0 liters of solvent. Using the formula M = moles/volume, you can find the molarity of the solution:

M = (2.0 moles) / (6.0 L)
M = 0.33 M

This means that the concentration of the solute in the solution is 0.33 moles per liter. Molarity is an important concept in chemistry as it helps in determining the concentration of a particular substance in a solution and is useful in various calculations and reactions.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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By create calibration curve.

What is calibration curve?

In many different disciplines, such as analytical chemistry and biochemistry, calibration curves are frequently utilized. A calibration curve is used to calculate the limit of detection and the limit of quantitation, as well as the concentration of an unknown material. The instrument response to a series of standard samples at various concentrations is used to produce the curve. To enable the prediction of unknown concentrations, the data are then fitted with a function.

A calibration curve can be used to figure out the concentration of an unidentified medication. By comparing these curves to data from known medications at different doses, researchers and developers can utilise them to establish where an unfamiliar compound plots. A spectrophotometer is used to collect absorbance for varied concentrations.

This method of identifying unknown substances can be advantageous to numerous industries. For instance, coffee roasting might make use of a calibration curve. A plot can be used by roasters to estimate a bean's caffeine spectrum. Gelatin's food colour content could be displayed on a calibration curve for the food industry.

Additional applications include

production of chemicals, plastics, paints, and cosmetics

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Answer:

solid substance formed during liquid solution, is known as precipitate. For example: in the reaction of silver nitrate and sodium chloride, a precipitate of silver chloride is formed which is white in colour. Precipitation can be of any colour like white, yellow, black.

Answer:

One

Explanation:

In a hydrogen atom, the first outer shell only consists of two valence electrons, because it would already have one, the atom only needs one more.

It requires two electrons to completely occupy its outer shell, it frequently forms a single covalent bond with another atom. Because of this configuration, hydrogen can gain access to two electrons and completely occupy its valence shell.

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Answer: I don't have the ability to conduct physical experiments or obtain solutions. However, I can provide you with some general information about the properties of CoCl2.6H2O in EtOH and H2O.

Cobalt chloride hexahydrate (CoCl2.6H2O) is a crystalline solid that is soluble in both water and ethanol. When dissolved in water, it forms a pink-colored solution due to the presence of hydrated cobalt ions. In contrast, when dissolved in ethanol, it forms a blue-colored solution due to the formation of a complex between cobalt ions and ethanol molecules.

The addition of CoCl2.6H2O to water or ethanol should result in the formation of a homogenous solution with a characteristic color. The color of the solution will depend on the solvent used and the concentration of the CoCl2.6H2O solution.

Explanation:

Ionizable Amino Acids

Seven out of the twenty amino acids contain readily ionizable side chain groups. That means that at specific pH values, each side chain can participate in an acid-base reaction in which it can exchange a hydrogen atom with some other biomolecule. Since these side chains can form ions, that implies that they can also participate in forming ionic bonds. On top of these seven amino acids with ionizable side chains, all of the amino acids contain an ionizable alpha amino group and an alpha carboxyl group. The pKa value of each side chain group determines the pH value at which there will be equal concentrations of the acid and its conjugate base. The pKa value of the alpha amino group is 3.1 while the pKa value of the alpha amino group is 8.0. The pkA values of glutamic acid and aspartic acid are 4.1, the pKa of cysteine is 6.0, the pKa value of lysine is 8.3, the pKa value of lysine is 10.8, the pKa value of tyrosine is 10.9 and the pKa value of arginine is 12.5.

Answer:

mercury and bromine are the only two elements