Select the correct statement to describe when a sample of water vapor condenses into liquid water.
Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined
Temperature decreases, molecular motion increases, volume decreases, and shape becomes less defined
Temperature increases, molecular motion decreases, volume decreases, and shape becomes less defined
Temperature decreases, molecular motion increases, volume increases, and shape becomes more defined

Answer:

2 atoms

Explanation:

Answer:

Approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Explanation:

The solubility of a solid in a liquid typically decreases as the temperature decreases. As a result, when a saturated solution is cooled, some of the solid may precipitate out of the solution.

The solubility of potassium nitrate (KNO3) in water at 20 degrees Celsius is around 42 grams per 100 milliliters of water. At 50 degrees Celsius the solubility is around 86 grams per 100 milliliters of water.

To find the mass of solid that will precipitate, we can use the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius.

At 20 degrees Celsius, the solubility of KNO3 is 42 g/100 mL, and at 50 degrees Celsius, the solubility is 86 g/100 mL.

So, the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius is 86 - 42 = 44 grams per 100 milliliters.

Since we have 20 mL of a saturated solution, we can calculate the mass of the precipitate by multiplying the difference in solubility by the volume of the solution:

44 g/100 mL * 20 mL = 8.8 grams.

So, approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Please note that this is an approximate calculation and the actual amount of precipitate may vary depending on other factors such as impurities and the specific conditions of the experiment.

Answer:

hello

Explanation:

bismuth has the greatest atomic radius.

Answer:

The molecular geometry of the molecule changes as atoms are replaced with lone pairs

Explanation:

A molecule having five atoms attached to a central atom possesses five electron domains and is expected to have a trigonal bipyramidal electron and molecular geometry. The axial bonds are expected to be at an angle of 90 degrees while the equatorial bonds are expected to be at an angle of 120 degrees.

However, if one of the atoms is replaced with a lone pair, the electron geometry remains trigonal bipyramidal but the molecular geometry changes to  see-saw. both equatorial and axial bonds are now less than 120 degrees and 90 degrees respectively.

If two atoms are replaced by lone pairs, the electron geometry remains trigonal bipyramidal but the molecular geometry changes to T shaped with a bond angle less than 90 degrees.

If three atoms are replaced by lone pairs, the electron geometry remains trigonal bipyramidal while the molecular geometry changes to linear with a bond angle of 180 degrees.

The replacement of atoms with lone pairs will result in the change of the molecular geometry from trigonal bipyramidal to see-saw by 1 atom replacement, T shaped by two atom replacement, and linear by 3 atoms replacement.

The shape of the molecule with 5 atoms attached to the central atom has been trigonal bipyramidal. The molecular geometry of the molecule as atoms are replaced with the lone pairs.

By the replacement of the atoms with lone pairs, the following geometry changes are observed:

No further change in the molecular geometry has been possible with the linear geometry.

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The formula for calculating the concentration of a solution in mg/L is as follows:Concentration in mg/L = (weight of solute in mg / volume of solution in L). Concentration in mg/L = (0.5 g × 1000 mg/g) / 0.5 L. Concentration in mg/L = 1000 mg/L.

(b) The formula for calculating the concentration of a solution in ppm is as follows:

Concentration in ppm = (weight of solute in mg / volume of solution in ml) × 10³.

Concentration in ppm = (0.5 g × 1000 mg/g) / 500 ml × 10³.

Concentration in ppm = 1000 ppm.

(c)The formula for calculating the concentration of a solution in ppb is as follows:

Concentration in ppb = (weight of solute in mg / volume of solution in ml) × 10⁶.

Concentration in ppb = (0.5 g × 1000 mg/g) / 500 ml × 10⁶.

Concentration in ppb = 1000000 ppb.

(d) Moles/lThe molecular weight of KCl is 74.55 g/mol.

To calculate the concentration of KCl in moles/liter, we must first convert 0.5 g to moles.

Number of moles = weight / molecular weight.

Number of moles of KCl = 0.5 g / 74.55 g/mol.

Number of moles of KCl = 0.0067 moles.

Concentration in moles/liter = number of moles / volume in L.

Concentration in moles/liter = 0.0067 moles / 0.5 L.

Concentration in moles/liter = 0.013 M (M = moles/L).

Therefore, the concentration of KCl is (a) 1000 mg/L, (b) 1000 ppm, (c) 1000000 ppb, and (d) 0.013 M.

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Answer

A compound made of two ions.

Explanation

A binary compound is a compound formed from two different elements. There may or may not be more than one of each element.

For a binary ionic compound, a metal will always be the first element in the formula, while a nonmetal will always be the second.

Hence, a binary ionic compound is a compound made of two ions.

(A) A student measured the boiling point of water to be 209°F . the accepted value is 212°F. the absolute error is  3°F   and the percent error is 1.41 5

(B) a bowling ball weighs 8 lbs. you decide to test your bathroom scale and you measure that ball weighing 7.35 lbs . the absolute error is 0.65lbs  and the percent error is 8.12 %

(A) The actual value = 212°F and The observed value = 209°F

     The absolute error = | actual value - observed value |

                                     =  |  212 °F - 209 °F |

                                     =  3 °F

percent error = ( | actual value - observed value | /actual value ) × 100 %

                       = ( 3 / 212 ) × 100 %

                       =  1.41 %

(B) The actual  value = 8 lbs

    The observed value = 7.35 lbs

The absolute error = | actual value - observed value |

                                = | 7.35 - 8 |

                               = 0.65 lbs

percent error = ( | actual value - observed value | /actual value ) × 100 %

                      = ( 0.65 / 8 ) × 100%

                      = 8.12 %

Thus, (A) A student measured the boiling point of water to be 209°F . the accepted value is 212°F. the absolute error is  3°F   and the percent error is 1.41 %

(B) a bowling ball weighs 8 lbs. you decide to test your bathroom scale and you measure that ball weighing 7.35 lbs . the absolute error is 0.65 lbs    and the percent error is 8.12 %

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Answer:

A. Distance = 18 m

    time = 2 hr

    speed = 9 m/hr

Explanation:

Speed is the same thing as velocity.

Velocity = distance/time

18m/2hr = 9m/hr

For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)

Answer:

Explanation:

In first picture,

When rock was not in the cylinder,

Volume of water

\( = {18cm}^{3} \)

In second picture,

When rock is in the cylinder,

Volume of water

\( = {36cm}^{3} \)

Hence,

Volume of rock

\( = 36 {cm}^{3} - {18cm}^{3} \)

\( = 18 {cm}^{3} (ans)\)

The pKa of the acid is 4.05

Calculation of pKa:

pKa tells about the strength of acidic molecule.

\(pK_{a}= -log[K_a]\)

Where Ka is the dissociation constant of an acid.

According to Henderson-Hasselbalch equation:

\(pH= pK_{a} + log\frac{[salt]}{[acid]} \\\)

pH= 4.41

Concentration of acid= 0.32M

Concentration of salt= 0.14M

Putting the values in the equation,

\(4.41= pK_{a} + log\frac{0.32}{0.14}\\\\4.41= pK_{a} + 0.36\\\\pK_{a}= 4.41 - 0.36\\pK_{a}= 4.05\)

The pKa of the acid is 4.05.

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Answer:

Appearance: Water is a colourless, odourless and tasteless liquid in its natural state. The crystal structure of water is hexagonal.

Density: The density of water is about 1 gm/cc and it varies with temperature in an undefined pattern. In solid state, the density remains close to 0.9gm/cc.

Viscosity: Viscosity is explained by the resistance to deformation at a given rate. In other words, the thickness of the liquid - eg, syrup or water. Viscosity of water is 0.89 cP.

Explanation:

An ionic salt, is more soluble in water

Polar substances  are generally more soluble in water compared to nonpolar substances. This is because water is a polar solvent, meaning that it has a partial positive charge on one end and a partial negative charge on the other end due to the asymmetric arrangement of its atoms.

Polar substances also have a partial positive and partial negative charge on different parts of their molecules, which allows them to interact with water molecules through electrostatic interactions,

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Hi! To answer your question about the carbon atom highlighted in the given structure, I would need to see the specific structure you are referring to. However, I can provide a general guideline on how to determine the hybridization, bond angles, and shape around a carbon atom in a structure.

1. Count the number of atoms directly connected to the carbon atom and the number of lone pairs on the carbon atom.
2. Use this information to determine the hybridization:
  - 2 electron groups (atoms or lone pairs): sp hybridization
  - 3 electron groups: sp2 hybridization
  - 4 electron groups: sp3 hybridization
3. Determine bond angles based on hybridization:
  - sp: 180 degrees
  - sp2: 120 degrees
  - sp3: 109.5 degrees
4. Identify the shape around the carbon atom:
  - sp: linear
  - sp2: trigonal planar
  - sp3: tetrahedral

Once you apply these steps to your specific structure, you should be able to indicate the hybridization, bond angles, and shape around the highlighted carbon atom.

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Answer:

10 moles of ammonia could be obtained from a maximum of 5.0 moles of nitrogen​.

Explanation:

The balanced reaction is:

N₂ + 3 H₂ → 2 NH₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Then you can apply the following rule of three: if by reaction stoichiometry 1 mole of nitrogen produces 2 moles of ammonia, 5 moles of nitrogen produces how many moles of ammonia?

\(moles of ammonia=\frac{5 moles of nitrogen*2 moles of ammonia}{1 mole of nitrogen}\)

moles of ammonia= 10

10 moles of ammonia could be obtained from a maximum of 5.0 moles of nitrogen​.

Explanation:

the pressure and temperature of the air increase

reason:

the volume of the space containing air decreases.

Explanation:

Whether you know it or not, compressed air is involved in every aspect of our lives, from the balloons at your birthday party to the air in the tires of our cars and bicycles. It was probably even used when making the phone, tablet or computer you’re viewing this on.

The main ingredient of compressed air is - you guessed it! - air. Air is a gas mixture, which means it consists of many different gases. Primarily these are nitrogen (78%) and oxygen (21%).

The temperature of the air is directly proportional to the mean kinetic energy of these molecules. This means that the air temperature will be high if the mean kinetic energy is large (and the air molecules move faster). The temperature will be low when the kinetic energy is small.

Compressing the air makes the molecules move more rapidly, which increases the temperature. This phenomenon is called “heat of compression”. Compressing air is literally to force it into a smaller space and as a result bringing the molecules closer to each other. The energy that gets released when doing this is equal to the energy required to force the air into the smaller space. In other words, it stores the energy for future use.

The separation compound using diffrence in boiling point melting point like physical properties.

What is physical properties ?

A physical property is the any  measurable property that  whose value describes the state of a physical in  system. Changes in the  system's physical properties of  can be used to describe its transitions between the  momentary of state.

A physical property is a characteristic of the  matter that is not associated with in a  change in its chemicals composition. Familiar to the  examples of physical  properties that is include density, color, hardness, melting and boiling points, and the  electrical conductivity.

There are mainly two types of physical properties extensive and intensive.

Sol-The separation scheme to  used to separate the mixture of   based on differences in this  physical properties- such as boiling point, melting point, solubility in a given solvent these are the three components.

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Answer:

A lot

Explanation:

- As you go down a group, the elements get larger in size

- All of the elements of the same group have the same # of valence electrons

- As you go to the right of a period, the # of electrons in the outermost shell increases

- The elements at the top right of the table have the highest electronegativity

- Groups 13 through 17 are nonmetals

- The last group contains noble gases

etc.

The mole fraction of \(CH_3OH\)in the solution is 0.850 or 85.0%.

To calculate the mole fraction (Χ) of methanol (CH3OH) in the given solution, we need to determine the number of moles of CH3OH and the number of moles of \(C_6H_5COOH\)(benzoic acid) in the solution.

First, we can calculate the number of moles of CH3OH using its volume and density:

Mass of CH3OH = Volume x Density = 8.50 mL x 0.792 g/mL = 6.732 g

Number of moles of CH3OH = Mass / Molar mass = 6.732 g / 32.04 g/mol = 0.210 mol

Next, we can calculate the number of moles of \(C_6H_5COOH\)using its mass and molar mass:

Number of moles of C6H5COOH = Mass / Molar mass = 4.53 g / 122.12 g/mol = 0.0371 mol

The total number of moles of solute in the solution is the sum of the moles of CH3OH and C6H5COOH:

Total number of moles = 0.210 mol + 0.0371 mol = 0.247 mol

Finally, we can calculate the mole fraction of \(CH_3OH\)using its number of moles and the total number of moles:

Mole fraction of \(CH_3OH\)= Number of moles of \(CH_3OH\)/ Total number of moles = 0.210 mol / 0.247 mol = 0.850

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Answer: the way root cells reproduce to increase root length

Explanation:

Rudolf Ludwig Carl Virchowas known as the founder of social medicine and also the father of modern pathology.

Virchow posited that all cells are gotten from already existing cells and he used this in his work towards cellular pathology, as it was made clear that diseases takes place at the cellular level. He posited that the cells that are malfunctioning cause diseases.

Based on the above analysis, the image that Tumu would most likely use in his assignment to feature Rudolf Virchow is the way root cells reproduce to increase root length.

Answer:

the way root cells reproduce to increase root length

Explanation:

Answer:

Around 17,000,000 or a little more than that

Answer:

Argon is a chemical element with the symbol Ar and atomic number 18.

Explanation:

Answer:

Avogadro's number is a very important relationshiptoremember: 1 mole = 6.022×1023 6.022 × 1023atoms, molecules, protons, etc.

...

Explanation:

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The chemical equation is Na₂CO₃(aq) + CoCl₂(aq) -> 2NaCl(aq) + CoCO₃ (s), which represents the reaction between sodium carbonate and cobalt chloride to form sodium chloride and cobalt carbonate precipitate.

The balanced chemical equation for the reaction between Na₂CO₃ (sodium carbonate) and CoCl₂ (cobalt chloride) is:

Na₂CO₃ (aq) + CoCl₂ (aq) → CoCO₃ (s) + 2NaCl (aq)

In this reaction, the sodium carbonate reacts with cobalt chloride to produce cobalt carbonate and sodium chloride. This is an example of a double displacement reaction, where the positive and negative ions of two compounds exchange places to form two new compounds.

In this case, the carbonate ion (CO₃²⁻) from sodium carbonate combines with the cobalt ion (Co⁺) from cobalt chloride to form cobalt carbonate (CoCO₃), which is a solid precipitate.

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The Diels-Alder reaction is an electrocyclic process that involves the [4+2]cycloaddition of 2 and 4 electrons from the dienophile and 4 electrons from the conjugated diene (an alkene or alkyne).

A conjugated diene and an alkene undergo a cycloaddition event in the Diels-Alder reaction. A 1,4-addition product is created by this reaction. The reaction of 1,3-butadiene with maleic anhydride serves as an example.

Consequently, [4+2] cycloaddition is the name given to the cyclic addition of diene and dienophile. This shows that a Diels-Alder reaction is best described by the [4+2] cycloaddition.

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CT scans operate on the wavelength of 0.01–0.1 nm whereas the signals of MRI ranges from 1MHz to 300MHz,

The CT scan device used the X-rays that have a wavelength of 0.01–0.1 nm. These wavelengths are longer than gamma rays but shorter than ultraviolet rays.

So we can conclude that CT scans operate on the wavelength of 0.01–0.1 nm whereas the signals of MRI ranges from 1MHz to 300MHz.

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Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

Lewis Structure for \(SO_2Cl_2\): The molecular formula of sulfur dichloride oxide is \(SO_2Cl_2\).

The Lewis structure for the sulfur dioxide dichloride molecule can be drawn by combining the Lewis structures for the individual components. \(SO_2Cl_2\) consists of S, O, and Cl atoms, with 2 oxygen atoms, 2 chlorine atoms, and 1 sulfur atom.

The electron-pair geometry of S in \(SO_2Cl_2\) is tetrahedral. The molecular geometry of \(SO_2Cl_2\) is bent (angular). In sulfur dioxide dichloride, the central atom is S (Sulfur) and there are two bonded oxygen atoms and two chlorine atoms. The structure of sulfur dioxide dichloride is tetrahedral with the sulfur atom at the center. Sulfur dioxide dichloride has a bent molecular geometry.

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Considering the definition of a reduced element, the correct answer is option D. an element has been reduced when it has more electrons in the product than in the reactant.

Oxidation and reduction reactions always occur simultaneously, which is why they are generally known as oxidation-reduction reactions or redox reactions.

For a redox reaction to exist, there must be an element in the system that gives up electrons and another that accepts them:

When a reducing chemical element gives up electrons to the medium, it becomes an oxidized element.

Similarly, it is said that when a chemical element captures electrons from the environment, it becomes a reduced element.

In summary, the correct answer is option D. an element has been reduced when it has more electrons in the product than in the reactant.

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Answer:

Temperature

Agitation

Particle size

Explanation:

6.0 × 10²³​ are the molecules  in 17 amu of ammonia, NH\(_3\). Therefore, the correct option is option D among all the given options.

The smallest recognizable unit in which a pure material may be split while retaining its composition and chemical characteristics is a molecule, which is a collection of two or more atoms.

Until portions made up of single molecules are reached, the split of a sample of a substance into increasingly smaller parts does not result in a change in either its makeup or its chemical characteristics.

molar mass of 1 mole of ammonia = 17 amu

1 mole of any substance contains 6.0 × 10²³​

6.0 × 10²³​ are the molecules  in 17 amu of ammonia, NH\(_3\).

Therefore, the correct option is option D among all the given options.

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Explanation:

Hello

I answered all your questions And I explained it to you in the photo sent.

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