dry ice sublimes at −78.5 oc at a pressure of 1 atm. at room temperature and 1 atm pressure, what is happening to the dry ice molecules on a molecular level as sublimation occurs?

Answer:

It's True

Explanation:

The person would be having an intense craving, which is a symptom of substance use disorder.

Answer:

Rocks beneath Earth's surface are forced toward the mantle.

Answer:

slate

Explanation:

:D

In a mass spectrum of benzene, you would expect to find the molecular ion peak at m/z 78. This is because the molecular ion of benzene (C6H6) is formed by the loss of one electron, resulting in a positive charge on the molecule.

The mass-to-charge ratio (m/z) of the molecular ion is equal to the molecular weight of the compound (78 g/mol) divided by the charge (+1), which gives a value of 78.
The molecular ion peak is typically the highest peak in the mass spectrum, as it represents the intact molecular ion of the compound. However, due to the relatively unstable nature of the benzene molecule, the molecular ion peak may not always be the most prominent peak in the spectrum. Instead, you may see other peaks corresponding to fragments of the molecule that have been broken apart during the ionization process.
Overall, the location and intensity of peaks in a mass spectrum can provide valuable information about the structure and composition of a compound, and can be used to identify unknown substances.

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Answer:

Potassium (K)

Explanation:

Out of the four options, Potassium is the only one to fill a total of 4 energy levels.

Both Cesium (Cs) and Rubidium (Rb) fill more than three energy levels, with Cesium filling 6 and Rubidium filling 5.

Sodium (Na) only fills 3 energy levels.

Thus, that leaves Potassium (K), which has 4 energy levels.

Hope this helped ^-^

On a cold day the atmosphere temperature is reported as 12. 9F. The temperature in kelvin is 262.54 °K.

The thermal energy of a substance or system is measured by its temperature. Temperature measurements are most frequently expressed in Celsius (°C), Fahrenheit (°F), and Kelvin (°K) (K).

A straightforward formula is used to convert between degrees Fahrenheit and Kelvin: K = (y °F - 32) x 5/9 + 273.15. The two most widely used and recognized temperature scales are in degrees Fahrenheit and degrees Kelvin.

°K= (Temperature- 32) x 5/9 + 273.15

°K= (12.9°F − 32) × 5/9 + 273.15 = 262.54 °K.

Therefore, the reported temperature of the atmosphere on a cold day is 12. 9F.The temperature in kelvin is 262.54 °K.

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Answer:

the mass percentage of water of crystallization in washing soda is 62.9 %.

Explanation:

Answer:

A. The battery. D. The wind turbine. E. The solar panels

These give us electrical energy

There is a spelling error, I believe that is supposed to say stretched bow.

By stretching back a bow you are storing (Elastic) Potential Energy.

The transformation is (elastic) potential energy into kinetic energy (with some energy lost as sound and heat)

Answer:

The pH scale ranges from 0-14.

Explanation:

Zero is the most acidic measurement while six would be the least acidic of the acids, seven is a pure substance, neither acidic nor basic, eight is the least basic measurement while 14 is the most basic of the bases.

Explanation:

The difference between addition polymerization and condensation polymerization is that in addition polymerization the polymers are formed by the addition of monomers without any by-products whereas in condensation polymerization, the polymers are formed due to the condensation of more than one different monomers resulting in the formation of small molecules such as HCl, water, etc., as by-products.

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer: Pieces of paper are attracted to the surface of the ballon due to static electricity.

Respuesta:

Cr₂S₃O₁₂

Explicación:

Primer paso: Dividir el porcentaje en masa de cada elemento por su masa atómica

Cr: 26,53/52 = 0,510

S: 24,52/32 = 0,766

O: 48,96/16 = 3,06

Segundo paso: Dividir todos los números por el más pequeño (0,510)

Cr: 0,510/0,510 = 1

S: 0,766/0,510 = 1,5

O: 3,06/0,510 = 6

Tercer paso: Multiplicar todos los números por algún número que haga que todos sean enteros (2)

Cr: 1 × 2 = 2

S: 1,5 × 2 = 3

O: 6 × 2 = 12

La fórmula empírica es Cr₂S₃O₁₂.

Answer: The empirical formula of the compound becomes \(Cr_2S_3O_{12}\)

Explanation:

The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.

Let the mass of the compound be 100 g

Given values:

% of Cr = 26.53%

% of S = 24.52%

% of O = 48.96%

Mass of Cr = 26.53 g

Mass of S = 24.52 g

Mass of O = 48.96 g

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

To formulate the empirical formula, we need to follow some steps:

Molar mass of Cr = 52 g/mol

Molar mass of S = 32 g/mol

Molar mass of O = 16 g/mol

Putting values in equation 1, we get:

\(\text{Moles of Cr}=\frac{26.53g}{52g/mol}=0.510 mol\)

\(\text{Moles of S}=\frac{24.52g}{32g/mol}=0.766 mol\)

\(\text{Moles of O}=\frac{48.96g}{16g/mol}=3.06 mol\)

Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.510 moles

\(\text{Mole fraction of Cr}=\frac{0.510}{0.510}=1\)

\(\text{Mole fraction of S}=\frac{0.766}{0.510}=1.5\)

\(\text{Mole fraction of O}=\frac{3.06}{0.510}=6\)

Multiplying the mole fraction of all the elements by 2, in order to make it as a whole number

\(\text{Mole fraction of Cr}=(2\times 1)=2\)

\(\text{Mole fraction of S}=(2\times 1.5)=3\)

\(\text{Mole fraction of O}=(2\times 6)=12\)

The ratio of Cr : S : O = 2 : 3 : 12

Hence, the empirical formula of the compound becomes \(Cr_2S_3O_{12}\)

when 0.367 mol of a weak acid, hx, is dissolved in 2.00 l of aqueous solution, the ph of the resultant solution is 2.60. ka for hx is 3.405 × \(10^{-5}\)

Number of moles = 0.367

Volume of solution = 2l

concentration = 0.367/2 = 0.1835 mol/L

ph = 2.60

we know

ph = - log [H+]

2.51 × \(10^{-2.60}\)M = [H+]

The acid HX dissociate as

HX → H+   +  X-

The acid dissociation constant Ka, for the dissociation reaction is

Ka = [H+][X-]/[HX] ; at equilibrium, [H+] = [X-]

Ka = 3.405 × \(10^{-5}\)

A solution in which water serves as the solvent is called an aqueous solution. The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na+(aq) + Cl The word aqueous, which derives from the word aqua, means that something is connected to, resembles, or is dissolved in water. Water is a common solvent in chemistry because it is an excellent solvent and abundant in nature. Since water is frequently used as the experiment's solvent, unless otherwise stated, the term "solution" refers to an aqueous solution.

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Answer:

4. C2H4, C3H6, C4H8

this is the alkane homologous series of hydrocarbons.

Their general formula is CnH2n

you can check this fits for all these compounds

put n = 1, 2, 3 and so on

Answer:

it's volume also decrease

Answer:

1

Explanation:

The amount of electron shells is the number of the period

As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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Answer:

u

r

m

o

m

Explanation:

For an ionic compound, the charge of the cationic and anionic parts are written in the crisscross formula of the compound. Here, the charge of oxygen is -2 and that of X is + 1.

Ionic compounds are formed between a metal and nonmetal by transferring one or more electrons from the metal to the non-metal. Thus, metal is having a positive charge (cation) and nonmetals gains a negative charge.

The charge of the cation is given as the subscript of anion and vice versa in  the formula of the compound.

Here, the overall charge of the compound X₂O is zero. Charge of oxygen is -2. It gains two electrons to achieve octet. Let x be the charge of one X.

then, 2x + -2 = 0

2x = +2

x =+1.

Therefore, the charge of X in the compound X₂O is +1.

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The proton-proton chain require a high temperature because at high temperatures the protons have enough speed to overcome the electrical repulsion, option B.

The proton-proton chain, often known as the p-p chain, is one of two known sets of nuclear fusion events that stars use to convert hydrogen to helium. It prevails in stars with masses less than or equal to that of the Sun, but theoretical models predict that the CNO cycle, the second known reaction, would dominate in stars with masses more than around 1.3 times that of the Sun.

The "proton-proton chain reaction," despite its name, is not a chain reaction in the traditional sense. A chain reaction is defined in most nuclear processes as a reaction that creates a product, such as neutrons released during fission, that promptly stimulates another similar event. The proton-proton chain is a succession of processes, similar to a decay chain. The result of one reaction serves as the starting ingredient for the next.

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Complete question:

Why does the proton-proton chain require high temperatures?

Answer:

tri-

Explanation:

Examples could be Tri-angle, Tri-cycle, Tri-ceratops

Answer:

tridiminotetracycleonmoon

Answer:

true.

Explanation:

As sedimentary rocks are formed from the accumulation of sediment, fossils can be buried and preserved over time, leading to the formation of fossil-rich sedimentary rocks.

What is Fossils?

Fossils are the remains or traces of prehistoric plants, animals, and other organisms that are preserved in rocks. Fossils provide valuable insights into the evolution of life on Earth, as they can help scientists to understand the types of organisms that lived in the past, how they evolved, and how they interacted with their environment.

Rocks that form from lava, such as igneous rocks, typically do not contain fossils because the high temperatures involved in the formation of lava can destroy organic matter, including the remains of plants and animals.

When lava flows onto the surface of the Earth, it can quickly cool and solidify, forming an igneous rock. This rapid cooling process does not allow for the preservation of any organic material that might have been present in the lava, including fossils.

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Answer:

solvent solutions

Explanation:

.............

Answer:

10.81

Explanation:

you can see the answer at the pic

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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