What is the mass of 1.70 mol of carbon-12?
Select one:
O
20.49
O
0.140 g
O
12.0 g
7.069

The choice of solution has a concentration of 1.144 mol/kg molality.

Molarity corresponds to the moles of solvent divided by the amount of solution in litres, whereas molality is equal with the moles of solvent divided by the quantity of solvent in kilogrammes.

Since 1 mole of solute is present in 1 litre for the solution, which contains both the solute and the solvent, 1 molar aqueous solutions are more concentrated than one decays aqueous solutions.

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Your calculations, which are rather precise, indicate that the sun is 500 light seconds away. Light travels thousands of miles roundtrip (not quite 17m). You receive 3.6 round trips each hour, or 74 daily.

Answer:

about 8.3 minutes to reach the Earth

Explanation:

To design a device for turning salt water into freshwater, we can leverage the processes involved in the water cycle, particularly evaporation and condensation.

The first step in the process is evaporation. By subjecting salt water to heat, we can initiate the evaporation process, just as the sun's heat causes water bodies to evaporate in nature.

The heat source can be provided by solar energy or through other means such as thermal energy. As the salt water is heated, the water molecules transition from a liquid state to a gaseous state, leaving the salt and other impurities behind.

The next step is condensation. The water vapor generated during evaporation needs to be collected and condensed back into a liquid form. This can be achieved by cooling the vapor, causing it to condense into freshwater. The condensed freshwater can then be collected and stored for use.

To enhance the efficiency of the process, additional techniques such as membrane filtration or reverse osmosis can be employed. These methods involve passing the salt water through a semipermeable membrane that allows the water molecules to pass through while trapping the larger salt particles and impurities.

By combining evaporation, condensation, and filtration techniques, a device can be designed to effectively convert salt water into freshwater. Such devices are commonly known as desalination plants or desalination units. They are utilized in areas where access to freshwater is limited, such as coastal regions with abundant seawater resources but scarce freshwater supplies.

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Answer:

The one that burned longer because it burned longer

Explanation:

Answer: We can point out two main reasons: atoms and molecules are too small to bee seen without the help of complex equipments and there are too many particles (atoms or molecules) in a small amount of substance (6.022 x 10^23 particles per mol of substance).

Explanation:

The question requires us to explain why atoms and/or molecules can't be count in dozen.

We can point out two main reasons for why it is not practical to count atoms and molecules the way we do with donuts and eggs, for example:

- The first one is the size of this particles. We need powerful and complex equipments to be able to see atoms and molecules. The size of atoms, for example, is measured in Angstroms, which corresponds to 10^-10 meters. Although molecules are slightly bigger, they are still too small to be seen without complex microscopes.

- Considering that we were able to see atoms and molecules in order to count them, there would be another issue: the amount of atoms and/or molecules contained in small amount of substances is too big. For example: let's consider 18 g of water, which corresponds to approximately 1 mol of this substance; in 18 g of water there are 6.022 x 10^23 molecules of water - which is way more complex than counting a dozen (12) units of donuts, for example.

Remember that

#1

Carbon is present so it's covalent

#2

#3

#4

#5

Answer:

Gas molecules move at different speed at a given temputure bc as temp increases they move faster

Explanation:

they move faster bc they gain kinetetic energy

"The blue proton is more acidic because its conjugate base is less stable, with a negative charge on the more electronegative oxygen atom." is the correct choice

The acidity of a proton depends on the stability of its conjugate base. The more stable the conjugate base, the less acidic the proton.

In this case, the blue proton is bonded to an oxygen atom, which is more electronegative than the carbon atom to which the red proton is bonded.

When the blue proton is removed, the resulting negative charge is delocalized onto the oxygen atom, which is more electronegative, therefore the conjugate base is less stable, making the blue proton more acidic.

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Answer:

If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?

Answer: Scientists make designs based on engineering knowledge and

then make it available for public use.

Answer:

2.61 × 10²³ atoms of Cu.

Explanation:

Given data:

Number of moles of Cu = 0.433 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ atoms of Cu

0.433 mol × 6.022 × 10²³ atoms of Cu  / 1mol

2.61 × 10²³ atoms of Cu

The answers to the virtual lab that specifies the use of a virtual spectrometer is given below:

2. Space consists of bodies with different types of electromagnetic spectrum.

This includes high-energy bodies emitting radiation in short wavelengths and extremely short wavelengths such as in UV spectrum, X rays, and gamma rays.

Conversely, other bodies might be emitting radiations in longer wavelengths such as Microwaves and Radio waves.

Since these radiations are at two different ends of the electromagnetic spectrum, a large number of equipment would be required for individually studying these space-based radiation sources and their characteristics.

3. The element missing from the moons and the planets would be Oxygen. It is to be remembered that Oxygen forms the base of the sustenance of life forms on Earth and forms an indispensable part of the carbon cycle. In the absence of oxygen, these planets and moons remain lifeless.

4. Stars emit heat and light. Along with the heat and light, radiations are emitted by the star. These radiations travel outward from stars and work as the signature of the stars. By analyzing the radiations from the stars, scientists back on Earth could deduce the physical conditions in the heart of a star including its constitution, temperature, and surface conditions.

E.g., If the star is emitting radiation in longer wavelengths, this is an indication that the star is cooling down and the temperature is relatively low.

5. The knowledge of the constitution of the elements making up the moon or planet is necessary to ascertain the life-sustaining capability of the same. Through adequate knowledge of the composition of the moon/planet, the possibility of the life-sustaining ability of the same could be deduced.

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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Answer:

The water/alcohol solvent caused the dots to move the most. The oil solvent

Explanation:

The volume of the solution is 2600 L

The first step is to determine how much solute you need to dissolve in the solvent. This will depend on the desired concentration of the solution and the volume of solvent you plan to use then measure the amount of solute needed for the solution. Be sure to use the correct units of measurement.

We know that;

Number of moles of the NaCl = 30.2 g/58.5 g/mol

= 0.52 moles

Now;

Number of Moles = Concentration * volume

Volume = Number of moles/Concentration

= 0.52 moles/0.200 M

= 2.6 L or 2600 mL

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In the given reaction, the limiting reactant is C₆H₆ (benzene).

To determine the limiting reactant as well as calculate the mass of HCl produced, compare the moles of each reactant.

The number of moles for each reactant:

Molar mass of Cl₂ = 35.5 g/mol + 35.5 g/mol = 71 g/mol

Moles of Cl₂ = mass of Cl₂ / molar mass of Cl₂

                     = 45 g / 71 g/mol

                     = 0.634 moles of Cl₂

Molar mass of C₆H₆ (benzene) = 12 g/mol + 6(1 g/mol) = 78 g/mol

Moles of C₆H₆ = mass of C₆H₆ / molar mass of C₆H₆

                        = 45 g / 78 g/mol = 0.577 moles of C₆H₆

Determine the stoichiometry between Cl₂ and HCl:

Cl₂ + C₆H₆ → C₆H₅Cl + HCl

Here, we can see that 1 mole of Cl₂ produces 1 mole of HCl.

Thus, the limiting reactant is C₆H₆ (benzene).

Calculate the mass of HCl produced:

Molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol

Moles of HCl produced = moles of C₆H₆ = 0.577 moles

Mass of HCl produced = moles of HCl produced × molar mass of HCl

Mass of HCl produced = 0.577 moles × 36.5 g/mol

                                     ≈ 21.04 g

Therefore, approximately 21.04 grams of HCl will be produced.

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Answer:

B. Solidification

Hope this helped! :)

Answer: Chloroplast: Converts energy from the sun to food energy

Answer: Vacuole: Servers as a temporary storage area for nutrients and waster materials.

Answer: Lysosome: Breaks down waste materials

Explanation: Dude above me is wrong

Answer:

(a) Chromatography

(b) DNA fingerprinting

(c) Origin

(d) Sweet C consists of more colours than sweet D.

  ii. The speed of colours in sweet C are proportional to one another, while that of colours in D is not.

Explanation:

Chromatography is one of the physical method of separating mixtures. This process composed of the ability of the constituents in a mixture to separate by virtue of rate of movement through a medium, thus separates into constituents.

It can be used to determine the soluble constituents of a given mixture. And for purification purpose.

A globally harmonized system (GHS) of classification and labeling of chemicals has aim of improving workers' safety and health.

The GHS is an internationally-agreed system that supplies nations with the regulatory building blocks to establish or modify existing national programs. It establishes criteria for the variety of chemical hazards and offers protective measures through safety data sheets and labels.

The aim of the GHS is to improve employees' safety and health by supplying them with easy-to-understand chemical hazard and precaution information Safety Data Sheets, on labels, and during safety training.

"

Complete question

globally harmonized system of classification and labelling of chemicals aims at _______________________.

"

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Answer:

Salt domes storage has advantages in cost, security, environmental risk, and maintenance. Salt formations offer the lowest cost, most environmentally secure way to store crude oil for long periods of time. Stockpiling oil in artificially-created caverns deep within the rock-hard salt costs historically about $3.50 per barrel in capital costs. Storing oil in above ground tanks, by comparison, can cost $15 to $18 per barrel - or at least five times the expense. Also, because the salt caverns are 2,000-4,000 feet below the surface, geologic pressures will sea; any crack that develops in the salt formation, assuring that no crude oil leaks from the cavern. An added benefit is the natural temperature differential between the top of the caverns and the bottom - a distance of around 2,000 feet; the temperature differential keeps the crude oil continuously circulating in the caverns, giving the oil a consistent quality.

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

Explanation:

HCl    ⇄    H⁺    +   Cl⁻

HCl is a strong electrolyte so it will ionize completely .

moles of Cl⁻ in 100 mL of .1 HCl = .1 x .1 = .01 gram - ion .

CaCl₂ = Ca⁺² + 2 Cl⁻

1 mole                2 mole

moles of CaCl₂ in 200 mL of .1 M CaCl₂ = .2 x .1 = .02 gram mole  .

.02 gram mole of CaCl₂ will give 2 x .02 = .04 gram-ion of Cl⁻ ion .

Total gram - ion of Cl⁻ = .01 + .04 = .05 gram-ion .

Total volume = 300mL = .3 L

molarity of Cl⁻ = .05 / .3 = .167 M .

HCl    ⇄    H⁺    +   Cl⁻

moles of H⁺ = moles of Cl⁻ = .01 gram-ion .

volume of solution = .3 L

molarity of H⁺ = .01 / .3 = 33.33 x 10⁻³ M .

[ H⁺] [ OH⁻] = 10⁻¹⁴

33.33 x 10⁻³  [ OH⁻] = 10⁻¹⁴

[ OH⁻] = 3 x 10⁻¹³

pOH = - log[OH⁻] = - log3 x 10⁻¹³

13-log3

= 13 - .477

12.52

or ,

pH = - log[H⁺] = - log33.33 x 10⁻³

3 - log 33.33

= 3 - 1.52

= 1.48

pOH = 14 - 1.48 = 12.52

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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that the number of collisions depends on the energy, of the number of reactant particles, not their orientation.

Energy is referred to by scientists as the capacity for work.People have figured out how to transform energy from one type to the other and use it to accomplish tasks, making modern civilization possible.

boosts employee confidence and enables new hires to settle in more quickly; results in a more efficient and successful staff; increases employee retention; andencourages dialogue between the new employee and the supervisor.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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The option (2) is correct - the concentration  of N2(g) is constant.

What is concentration?

The quantity of a material, like salt, that is present in a specific amount of tissue or liquid, like blood. When there is less water present, a material becomes more concentrated.

What is equilibrium ?

Chemical equilibrium is characterised as a dynamic state in which the concentration of each reactant remains constant. They may not be equal, but they are not altering. A double arrow in a chemical process signifies an equilibrium state. Products are on the right while reactants are on the left.

Therefore, option (2) is correct - the concentration of N2(g) is constant.

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