At which temperature would air hold the LEAST water vapor?

A. 13°C (55°F)

B. 35°C (95°F)

C. 24°C (75°F)

D. 2°C (36°F)

Explanation:

two moles of hydrogen atoms and one mole of oxygen atoms.

Answer:

Answer is option D

Explanation:

resistance of movement between two surfaces in contact

Answer:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

Explanation:

The radioactive decay of the atom of an element by the emission of a beta-particle is equivalent to the splitting of a neutron in the nucleus of the radioactive element into an electron and a proton. The proton is retained by the nucleus whereas the electron is emitted as a beta-particle. This retention of the proton results in an increase of the atomic number by 1. A beta-particle is an electron. The electron is a very light particle and its loss makes no significant change in the mass number of the atom involved.

The beta decay of Hg-202 results in an increase of the atomic number from 8-0 to 81. Hence, Hg-202 is transformed to Tl-202. the balanced nuclear equation is given below:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

Explanation:

you can use Born-Lande equation,

U=-(A×e^2×Z+ ×Z- ×N)\r ×(1-1/n)

here,U=lattice energy

A=madelung constant

n=Born exponent(depends on repulsion between ion)

e=charge of electron

Z+,Z-=charge of cation and anion

r=distance between cation and its neighbour anion in

space lattice

Answer

Provide the body with the calories, or energy, to grow as well.

Answer:

Getting 8 hours of sleep will make the test grades go up.

Explanation:

because the kids will not be tired in the morning.

Bromoethane and aqueous KOH reaction:

When a bromoethane is treated with aqueous KOH, one of the products of the reaction is a primary alcohol, ethanol.

The reaction:

CH3CH3Br + KOH (aq) ==> CH3CH2OH + KBr

There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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Explanation:  

# of molecules = Moles × Avogadro's Number  

                         =  (0.180 mol) × (6.022 × 10²³ molecules/mol)  

                         =  1.084 × 10²³ molecules

sulphur dioxide molecules are there in 0.180 mole of sulphur dioxide is 1.084 × 10²³ molecules.

A molecule is the smallest unit of a substance that keeps its content and properties. It is made up of two or more atoms that are joined together by chemical bonds. Chemistry is based on molecules.

molecules = Moles × Avogadro's Number  

 =  (0.180 mole) × (6.022 × 10²³ molecules/mole)  

  =  1.084 × 10²³ molecules

Thus, sulphur dioxide molecules are there in 0.180 mole of sulphur dioxide is 1.084 × 10²³ molecules.

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Answer:

c

Explanation:

Tanine acid are the complex organic compounds concentrated in grapes' skin, pits and stems that gives red wines their characteristic dry sensation and slight bitterness.

The fermentation process starts when the skin of ripe grapes is damaged when they are stored in tightly sealed jars, where yeasts grow. Up until all of the grape juice's sugar has been converted to alcohol, this process continues ongoing. Carbon dioxide and ethanol are produced from glucose in this process. In order to generate wine, yeast must consume the sugar in the grapes during fermentation, which is a chemical transformation. Moreover, all that is necessary to start the fermentation is to crush the grapes and keep them in a covered container. Because wild yeasts which are found on the grapes' outer cover cause the process of natural fermentation to start as soon as they are crushed.

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(D)

Explanation:

On the left side two molecules, each made of 2 grays and 3 blues, which suggests that only (D) offers the right combination: 2 Al atoms and 3 O atoms that make up Al2O3.

Ari would use the model "it is similar to the way batteries generate electricity" to describe the chemistry-to-electricity process of the action potential.

This model is appropriate because, similar to how batteries generate electricity through chemical reactions, action potentials in neurons also involve a chemical process.

During an action potential, there is a rapid exchange of ions across the cell membrane, which creates an electrical current. This process relies on the movement of charged particles, specifically sodium and potassium ions, across the membrane, which is similar to how batteries generate electricity through the movement of ions. By using this model, Ari can help the high school students understand the electrochemical nature of action potentials and how they contribute to the communication between neurons in the nervous system.

Hence, the correct option is "it is similar to the way batteries generate electricity".

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Ari would use the model "it is similar to the way batteries generate electricity" to describe the chemistry-to-electricity process of the action potential.

This model is appropriate because, similar to how batteries generate electricity through chemical reactions, action potentials in neurons also involve a chemical process.

During an action potential, there is a rapid exchange of ions across the cell membrane, which creates an electrical current. This process relies on the movement of charged particles, specifically sodium and potassium ions, across the membrane, which is similar to how batteries generate electricity through the movement of ions. By using this model, Ari can help the high school students understand the electrochemical nature of action potentials and how they contribute to the communication between neurons in the nervous system.

Hence, the correct option is "it is similar to the way batteries generate electricity".

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Answer: The second reaction took place at a higher temperature

Explanation:

Rate is affected by temperature, as higher temperatures cause the reacting molecules to have more energy.

Collision theory states that in order for a reaction to occur, each reacting molecule must collide with one another in the correct orientation and with enough energy, called the activation energy.

A higher energy caused by a higher temperature will cause the molecules to collide much more frequently, leading to a higher chance of a successful collision, and with more energy to satisfy the activation energy.

Therefore, the second reaction must have taken place at a higher temperature, since the molecules had more energy than the first reaction leading to a higher rate of reaction, and a higher rate constant.

The temperature of the liquid in the flask on the previous page measured when the liquid in the thermometer has stopped rising   to measure confirmed or fixed temperature.

When the liquid in the flask is heated, its temperature rises, and when a thermometer is inserted into the flask to gauge the liquid's temperature, the liquid within the thermometer also begins to warm up.

The temperature of the liquid rises as a result of heat being transferred from a high temperature to a low temperature until the temperatures are equal. Therefore, when the liquid stops rising, both are at the same temperature, and this is how the liquid in the flask is being measured.

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Answer:

B. three atoms of oxygen

Stirring allows hot liquid to reach the surface much faster than unassisted convection

Answer:

Water is a compound. It contains more than one element: hydrogen and oxygen atoms are joined together;

Answer:

1. 16.9.

2. 33.20

3. 33

Explanation:

In the sum, significant figures are determined by the number with the lower number of decimal places.

In the multiplication, significant figures are equal to the significant figures of the number with the low amount of significant figures

1. 3.41 + 5.3 + 8.2010 = 16.9

2. 19.22 + 11.000 + 2.979 = 33.20

3. 2.222 * 3.33 * 4.4 = 33

Answer: Na

Explanation:

on the left it says Na, and on the right it says Na2

Answer: In this order

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Explanation:

Answer:

Mars.....................

Answer:

Yes

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. ... Notable gemstones high in beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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Answer:

37

Explanation:

( 98.6 - 32 ) × 5(100c) ÷ 9(180f) = 37

Answer:

Gases:

Gases can be squeezed into smaller spaces when pressure is applied.

Gases can expand to fill any available space.

Gases are light and can move easily.

Gases are used in systems that need quick and flexible movements.

Liquids:

Liquids cannot be easily squeezed into smaller spaces.

Liquids take the shape of the container they are in.

Liquids are heavier and flow more slowly.

Liquids are used in systems that require strong forces and precise control.

How these properties affect their use as fluid power mediums:

Gases are used when we want things to move quickly and easily, like in pneumatic systems (e.g., inflating balloons).

Liquids are used when we need strong forces and precise control, like in hydraulic systems (e.g., operating heavy machinery).

So, gases are good for quick and flexible movements, while liquids are better for strong forces and precise control.

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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We can use the ideal gas law to find the amount of ethane added. Therefore, the number of moles of ethane added to the flask is 0.0604 mol.

Given,The volume of the flask V = 1.00 LThe mass of argon in the flask m = 1.45 gThe temperature of the flask T = 25 ∘C = 25 + 273 = 298 KThe total pressure of the mixture p = 1.300 atmWe need to find the number of moles of ethane added to the flask.Let the number of moles of ethane be n. Then the total number of moles of the gas mixture in the flask is:n = (pV - patm) / RTwhere R is the ideal gas constant and patm is the atmospheric pressure (0.987 atm at sea level).

Since the initial pressure was due to argon, we can find the number of moles of argon in the flask by using the ideal gas law:pV = nRTn = (pV) / RT - (mAr / MAr)where MAr is the molar mass of argon. Substituting the values, we get:n = (1.300 atm × 1.00 L) / (0.0821 L atm mol^-1 K^-1 × 298 K) - (1.45 g / 39.95 g mol^-1) = 0.0419 molSubstituting this value in the previous equation, we get:nC2H6 = (1.300 atm × 1.00 L - 0.987 atm × 1.00 L) / (0.0821 L atm mol^-1 K^-1 × 298 K) - 0.0419 mol = 0.0604 mol .

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