select the correct answer​

Water vapor is the gas that has a variable concentration in the atmosphere. Its concentration can vary greatly depending on factors such as temperature, humidity, and weather patterns.

Water vapor is constantly being added to the atmosphere through evaporation from bodies of water and transpiration from plants. It can also condense into clouds and precipitation, leading to fluctuations in its concentration in different regions and over time. On the other hand, carbon dioxide, methane, and ozone are considered trace gases and their concentrations in the atmosphere are relatively stable, with variations mainly due to human activities and natural processes.

The gases that have variable concentrations in the atmosphere are:

- Carbon Dioxide (CO2): The concentration of carbon dioxide in the atmosphere can vary due to natural processes such as photosynthesis and respiration, as well as human activities like the burning of fossil fuels. Changes in land use, deforestation, and industrial processes can contribute to fluctuations in carbon dioxide levels.

- Methane (CH4): Methane concentrations in the atmosphere can vary as a result of both natural and anthropogenic sources. Natural sources include wetlands, termites, and natural gas seepage, while human activities such as livestock farming, rice cultivation, and fossil fuel extraction contribute to increased methane emissions.

- Ozone (O3): Ozone concentrations in the atmosphere can vary regionally and temporally. While ozone is naturally present in the stratosphere, where it plays a crucial role in protecting the Earth from harmful UV radiation, ground-level ozone is formed through chemical reactions involving pollutants emitted by human activities, including vehicle emissions and industrial processes.

- Water Vapor (H2O): Water vapor is highly variable in the atmosphere and its concentration can vary significantly depending on the location, temperature, and weather conditions. It is influenced by factors such as evaporation from bodies of water, transpiration from plants, and atmospheric dynamics. Water vapor is a key component of the Earth's climate system and plays a crucial role in weather patterns.

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Explanation:

Electronic Configuration of First 30 Elements with Atomic Numbers

Atomic Number Name of the Element Electronic Configuration

18 Argon (Ar) [Ne] 3s2 3p6

19 Potassium (K) [Ar] 4s1

20 Calcium (Ca) [Ar] 4s2

21 Scandium (Sc) [Ar] 3d1 4s2

26 more rows

Explanation:

NUMBER ELEMENT ELECTRON CONFIGURATION

1 Hydrogen 1s1

2 Helium 1s2

3 Lithium [He]2s1

4 Beryllium [He]2s2

5 Boron [He]2s22p1

6 Carbon [He]2s22p2

7 Nitrogen [He]2s22p3

8 Oxygen [He]2s22p4

9 Fluorine [He]2s22p5

10 Neon [He]2s22p6

11 Sodium [Ne]3s1

12 Magnesium [Ne]3s2

13 Aluminum [Ne]3s23p1

14 Silicon [Ne]3s23p2

15 Phosphorus [Ne]3s23p3

16 Sulfur [Ne]3s23p4

17 Chlorine [Ne]3s23p5

18 Argon [Ne]3s23p6

19 Potassium [Ar]4s1

20 Calcium [Ar]4s2

I think the answer is pentan-2-ol

Answer:

The answer is C 8.90

Explanation:

Edge 2020

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the density of the unknown metal is 8.9g/L. The correct option is option C.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density of  unknown metal  = Mass of unknown metal ÷volume marked on the graduated cylinder

Mass of unknown metal = 222.50 g

Volume of unknown metal = 25.00l

substituting all the given values in the above equation, we get

Density of  unknown metal  =  222.50 g / 25.00l

Density of  unknown metal  = 8.9g/L

Therefore, the density of the unknown metal is 8.9g/L. The correct option is option C.

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Answer:

Temperature and transverse motion are not related.

Explanation:

Answer: In summary, a primary amine should show between one and three signals in the IR spectrum between 3350 cm-1 and 3500 cm-1.

The exact number of signals depends on the structure and chemical environment of the molecule.

The infrared (IR) spectrum of a primary amine should show signals between 3350 cm-1 and 3500 cm-1, with the exact number depending on the structure and chemical environment of the molecule. Generally, primary amines should exhibit signals at 3300 cm-1, 3350 cm-1, 3420 cm-1 and 3500 cm-1. These signals correspond to the stretching vibrations of the N-H bond, C-N bond, C-H bond and the N-H out of plane bend, respectively.

To determine the number of signals expected between 3350 cm-1 and 3500 cm-1, one needs to consider the structure and environment of the molecule in question. In an unmodified primary amine, a total of two signals should be seen, namely the C-H bond at 3350 cm-1 and the N-H out of plane bend at 3500 cm-1.

However, if the primary amine has a ring structure or is part of a larger, more complex molecule, additional signals may appear, including the C-N bond at 3420 cm-1.

In summary, a primary amine should show between one and three signals in the IR spectrum between 3350 cm-1 and 3500 cm-1. The exact number of signals depends on the structure and chemical environment of the molecule.

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Answer:

There are 2 nitrogen atoms on the product side.

There are 6 hydrogen atoms on the reactant side.

Explanation:

Answer:

There are  2  nitrogen atoms on the product side.

There are  6  hydrogen atoms on the reactant side.

Explanation:

As seen in the picture below,

Green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

To calculate the frequency of sunlight with a wavelength of 642 nm that is strongly absorbed by chlorophyll for photosynthesis, we'll need to use the following formula:

Frequency (ν) = Speed of light (c) / Wavelength (λ)

First, we'll convert the given wavelength from nanometers to meters:

1 nm = 1 x 10^(-9) m
642 nm = 642 x 10^(-9) m = 6.42 x 10^(-7) m

Now, we'll plug the values into the formula:

Speed of light (c) = 3.00 x 10^8 m/s
Wavelength (λ) = 6.42 x 10^(-7) m

Frequency (ν) = (3.00 x 10^8 m/s) / (6.42 x 10^(-7) m)

Frequency (ν) ≈ 4.67 x 10^14 Hz

So, green plants absorb sunlight with a frequency of approximately 4.67 x 10^14 Hz to power photosynthesis.

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Answer:

A. The energy increases the molecular motion and the kinetic energy of the substance.

Explanation:

When a substance absorbs energy, the molecules will move faster because there will be more vibrations and collisions.

As a result of more molecular motion, the kinetic energy will increase because there is more movement.

0.18 L of solution can be prepared using 7.55g of KCl if the final molarity is 0.55M.

Molarity (M) is known to be the amount of a substance in a given volume of solution which is usually is defined as the number of moles of solute per liter of solution.

Both molarity and molarity are measures of the concentration of a chemical solution. The main difference between the two is mass and volume. Molarity refers to the moles of solute to the mass of the solvent, and molarity refers to the moles of solute to the volume of the solution.

Let's calculate no. of moles first:

No. of moles = Mass/Molecular mass

Mass of given KCl = 7.55 g

Molecular mass of KCl = 74.5513 g/mol

No. of moles = 7.55/74.5513

No. of moles = 0.100 mol

Now, for the calculation of molarity:

Molarity = No. of moles/V of solution

0.55 = 0.100/V

V = 0.100/0.55

V = 0.18 L

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Answer:

B. 4.0

Explanation:

The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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The reaction between solid calcium oxide and carbon dioxide gas results in the conversion of the calcium oxide into calcium carbonate, illustrating a chemical transformation from a basic oxide to a carbonate compound.

When solid calcium oxide (CaO) is exposed to a stream of carbon dioxide (CO2) gas, a chemical reaction takes place, resulting in the formation of calcium carbonate (CaCO3).

The balanced chemical equation for the reaction is as follows:

CaO + CO2 -> CaCO3

In this reaction, carbon dioxide reacts with calcium oxide to produce calcium carbonate. The reaction is classified as an example of a neutralization reaction or an acid-base reaction.

The carbon dioxide gas (CO2) acts as an acid in this reaction, while calcium oxide (CaO) acts as a base. The carbon dioxide molecules donate a hydrogen ion (H+) to the calcium oxide, which accepts the hydrogen ion and forms calcium carbonate.

Calcium carbonate is a solid compound that is commonly found in nature, such as in limestone, marble, and seashells. It is also used in various applications, including as a dietary supplement, antacid, and in the production of cement and lime.

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Answer:

2..............

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

Answer:

A. 2

Explanation:

Answer:

Gamma ray

Hope this helps!!!!!!!!

Answer:

it's volume also decrease

Answer:

C8H16

Explanation:

First thing to do here is to calculate the molar mass of the compound

Mathematically;

molar mass = mass/number of moles

we can calculate the number of moles using the ideal gas equation

Mathematically;

PV = nRT

n = PV/RT

where p is the pressure at 5 atm

V is the volume at 568 ml = 568/1000 = 0.568 L

R is the molar gas constant which is 0.0821

T is the temperature which is 120+ 273 = 393k

Inserting these values into the equation, we have

n = (5 * 0.568)/(0.0821 * 393)

n = 0.088 moles

So the molar mass = 10/0.088

= 114 g/mol

Now let’s go to the percentages

C = 84.2/12 = 7.016666666666667

H = 15.8/1 = 15.8

divide by the smallest

C = 7.016666666666667/7.016666666666667 = 1

H = 15.8/7.016666666666667 = 2 approximately

The empirical formula is CH2

So for the molecular formula, we have;

(12 + 2)n = 114

14n = 114

n = 114/14 = approximately 8

So the molecular formula of the liquid will be (CH2)n = C8H16

Based on the presence of the 'a' form of glycogen phosphorylase, it is likely that only the R form exists, allosteric effectors are more potent, and glucagon is in the bloodstream.

Based on the given information that the 'a' form of glycogen phosphorylase is present, the following statements are likely:

Only the R form exists: The 'a' form of glycogen phosphorylase corresponds to the active, phosphorylated form. In this state, only the R (relaxed) form exists. The T (tense) form is the inactive, non-phosphorylated state.

Allosteric effectors are more potent: The R form of glycogen phosphorylase is more sensitive to allosteric effectors, meaning that these effectors are more potent in regulating its activity. Allosteric effectors can activate or inhibit the enzyme's function by binding to specific allosteric sites.

Glucagon is in the bloodstream: Glucagon is a hormone released by the pancreas in response to low blood sugar levels. It stimulates the breakdown of glycogen into glucose, activating glycogen phosphorylase. Therefore, when the 'a' form of glycogen phosphorylase is present, it suggests that glucagon is in the bloodstream.

The following statement is not likely:

Insulin is in the bloodstream: Insulin is a hormone released by the pancreas in response to high blood sugar levels. It promotes the storage of glucose as glycogen and inhibits glycogen phosphorylase activity. Therefore, when the 'a' form of glycogen phosphorylase is present, it indicates a state of glycogen breakdown, which is not consistent with insulin being in the bloodstream.

In conclusion, based on the presence of the 'a' form of glycogen phosphorylase, it is likely that only the R form exists, allosteric effectors are more potent, and glucagon is in the bloodstream.

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When a moderate amount of a weak acid is placed in aqueous solution  the HA which is a nonionized acid considered as the greatest concentration. Option (A) is correct.

A weak acid is defied as an acid which is partially dissociates into its ions in an aqueous solution or in the water. It is evident that the conjugate base of a weak acid is a weak base while the conjugate acid of a weak base is considered as a weak acid. When a weak acid is placed in aqueous solution a non ionized form is in greatest concentration as the weak acid dissociates smaller amount. These are the acids which don't completely dissociate in the solution. A weak acid generally not considered as the strong acid as it is not dissociates completely.

The chemical reaction can be written as,

HA (aq.)  + \(H_{2} O\) (l)   ------------>  \(A^{-}\) (aq.)  +  \(H_{3}O ^{+}\) (aq.)

In this chemical reaction,  HA is considered as the greatest concentration.

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The complete question is,

when a moderate amount of a weak acid is placed in aqueous solution, which of the following will be present in the greatest concentration?

select the correct answer below:

A. the nonionized acid

B. the hydronium ion

C. the conjugate base of the acid

D.  impossible to predict

At 1 atm of pressure and a temperature of 0°C, all three phases of water (liquid, solid, and gas) can exist simultaneously.

This phenomenon is known as triple point, and it occurs at a specific temperature and pressure where the three phases of water can coexist in equilibrium. At triple point, the vapor pressure of water is equal to the liquid and solid water's vapor pressures, and they form a single point on the phase diagram of water.

In other words, at triple point, the liquid, solid, and gas phases of water are in equilibrium with each other, and they cannot be separated by simple physical means. This is why triple point is an important scientific measurement, as it provides a fixed point on the phase diagram of water from which other points can be calculated.  

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The formula that shows the correct representation of the combined gas law is; V1P1 / T1=V2P2 / T2

The combined gas law is obtained from the statements of Charles law and Boyle's law as follows;

Charles law; V/T = k

Boyle's law = PV = k

Combining the two I have; PV/T = k

For two masses of an ideal gas;

V1P1 / T1=V2P2 / T2

This is the statement of the combined gas law.

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Gases Unit Test Honors Chemistry A

1) B. The volume increases to twice its original value.

2) A. volume and temperature directly proportional

pressure and volume inversely proportional

pressure and temperature directly proportional

3) D. Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas

4) B. V1P1/T1=V2P2/T2

5) A. It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.

6) D. keeping the pressure constant and increasing the temperature

7) A. When temperature is held constant and volume increases, the pressure increases.

8) D. pressure, volume, temperature, number of moles

9) A. volume

10) A. 7.10 L/mol

11) A. 0.105 mol

12) B. 27 g/mol

13) B. the temperature increasing by a factor of 2

14) brainly.com/question/24915187

15) brainly.com/question/24544023

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17) brainly.com/question/24598785

Answer:

36.02g bbbbbbbbbbb hbbnjkkkj

Answer:

36.02g

Explanation:

Hope this helps!

According to the question the (\(H_3PO_4\)) is a triprotic acid.

Acid is a substance that has a pH lower than 7.0 and is capable of releasing hydrogen ions. Acids are typically corrosive, meaning they are able to break down materials like metals or fabrics. Acids can also be used to adjust the pH of liquids, or the acidity or alkalinity. Acids have many uses in everyday life, such as cleaning, food processing, and chemical processes. Acids are also used to form salts when combined with bases, a process known as neutralization. Acids can be classified as either organic or inorganic, with organic acids typically derived from living things like plants and animals, and inorganic acids typically produced synthetically.

\(H_3PO_4\) is a triprotic acid, meaning it has three ionizable hydrogen atoms. \(HPO_2-4\) and \(H_2PO-4\) are polyprotic acids, with two ionizable hydrogen atoms each.

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Answer:

mu answer is A

Explanation:

i think it is a popular opinion because its the opinion of a country

Answer:

B

Explanation:

B is the best showing of a chemical reaction out of the choices

Answer:

it is all except C

Explanation:

a chemical reaction occurs when 2 substances completely mix together and they do not remain separate

The new freezing point of the solution is 1.09 °C.

Based on the given information, the freezing point of pure water is 0.0 °C, and the freezing point changes by 1.09 °C. To find the new freezing point of the solution, we need to add the change in freezing point to the freezing point of pure water.

0.0 °C + 1.09 °C = 1.09 °C

Therefore, the new freezing point of the solution is 1.09 °C.

When performing calculations with significant figures, it's important to consider the rule for addition and subtraction. According to this rule, the result should be rounded to the least number of decimal places among the values being added or subtracted. In this case, both the freezing point of pure water (0.0 °C) and the change in freezing point (1.09 °C) have one decimal place. Thus, the final answer is also rounded to one decimal place, resulting in a new freezing point of 1.1 °C.

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Answer:b

Explanation:

Answer:

Swedish physicist Johannes Rydberg

Explanation:

Answer:

= 100u. Hence 10 g = 0.1 mole. Hope it's helpful to u

Answer:

i think b

Explanation:

A student measures the volume of a rock and then repeats the measurement two times. For the three measurements to be very precise the measurements must be very close to one another for rock. Option B is correct.

While measuring something is the measured value is close to each other then the result measurement is said to be precise and the phenomena are called precision.

In the measurement of rock, the measured values must be close to each other and do not vary much then only the measurement of students can be precise.

Therefore, Option B is correct, the measurements must be very close to one another for the rock student measures the volume of a rock and then repeat the measurement two times. For the three measurements to be very precise.

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