What is the mass in grams of 4.85 x 10^22 Al atoms? (Report your answer to two places past the decimal

Answer:

0.086

Explanation:

A 5.2 molal aqueous solution of methyl alcohol indicates that 5.2 moles of methyl alcohol are present in 1 kilogram (or 1000 g) of water. Water has a molecular weight of 18 g/mol.

(100g)/18g/mol=55.56 mol

5.2 mol/(5.2mol+55.56 mol)=0.086

Taste and smell perception is influenced by various factors, including specific chemicals in food, but not directly associated with a particular mineral.

No particular mineral is especially related to taste or smell perception. Instead, a number of variables, such as the presence of particular molecules in the food we eat, impact them.

When it comes to taste, taste buds on the tongue allow us to recognize flavors like sweet, sour, salty, bitter, and umami. These taste buds have receptors that can interact with specific food components. For instance, sweetness is detected via receptors responsive to sugars.

On the other hand, our sense of smell is strongly connected to our olfactory system. In our nasal cavity, olfactory receptors control our perception of smell. These receptors have the ability to recognize and react to a variety of odor molecules found in the air we breathe.

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Taste and smell perception are associated with the mineral zinc. Zinc is an essential mineral that plays a crucial role in various physiological processes, including taste and smell perception.

It is involved in the function of taste buds and olfactory receptors, which are responsible for detecting and interpreting sensory stimuli related to taste and smell.

In relation to taste perception, zinc is required for the proper functioning of taste buds on the tongue. Taste buds contain specialized cells called gustatory cells, which have receptor proteins that detect different taste sensations such as sweet, sour, bitter, salty, and umami. Zinc helps in the activation of these taste receptors and contributes to the overall sensitivity and perception of taste.

Regarding smell perception, zinc is involved in the structure and function of olfactory receptors in the nasal cavity. Olfactory receptors are responsible for detecting and identifying various odors. Zinc supports the proper functioning of these receptors, enhancing the sense of smell and allowing for the recognition and discrimination of different smells.

It's worth noting that while zinc is associated with taste and smell perception, other factors such as genetics, overall health, and environmental factors can also influence an individual's ability to perceive and differentiate tastes and smells.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer: d

Explanation:

The correct answer is A: Vapor pressure lowering.

Certain properties in chemistry are called colligative properties. These colligative properties depends on the amount of solute present.

Examples of colligative properties include;

When a solute is introduced into water, the vapour pressure of water is lowered.

Hence, when KI is added to a sample of water, vapor pressure lowering occurs.

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Answer:

What is the valency of elements in the group 'v' of the modern periodic table?

Answer: -3

What is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group? ​

Answer: On moving down the group, there is a decrease in the electron affinity of elements. It is because, as the size of an atom increases, the valence electrons get further away from its nucleus. Thus, the attraction between them decreases.

Answer:

Because Democritus or Liucipius cannot demonstrate or proof their ideas as they did not have any equipment or any research to prove the existence of atoms.

Explanation:

John Dalton, Democritus and Leucipius are some of the greatest scientist and scholars of the past.

Democritus originally proposed or gave the idea of the of the composition of the matter of indivisible and tiny particles. John Dalton is credited for the beginning of the modern atomic theory.

Democritus believed that a matter is made up of atoms that can move about empty spaces. They are small, indestructible, solid, indivisible and of different shapes and sizes. Democritus proposed his idea at that time as there were no scientific advancement or instruments to prove his ideas about atoms.

Later on when science and scientific processes were advanced, Dalton was able to prove and proceed on the atomic model theory.

Democritus cannot prove his ideas as there were no instruments or advance scientific processes and so people felt his ideas as illogical. His proposals were based on his ideas.  

ANSWER

2Ba + 2HBr → 2BaBr + H2

2BiCl3 + 3H2S → Bi2S3 + 6HCl

Br2 + 2KI → I2 + 2KBr

4Fe + 3O2 → 2Fe2O3

Answer:

\(3Mg _{(s)} + N _{2(g)} → Mg_{3} N _{2(s)}\)

\(Ba _{(s)} + 2HBr_{(g)} → BaBr _{2(s)} + H _{2(g)}\)

\(2BiCl_{3(s)} + 3H_{2} S _{(g)} → Bi _{2} S _{ 3(g)} + 6HCl _{(g)} \\ \)

\(Br_{2(g)} + 2KI _{(g)} → I _{2(g)} +2 KBr _{(g)}\)

\(4Fe_{(s)}+ 3O_{2(g)} → 2Fe_{2} O _{3(s)} \)

Answer:

2+

Explanation:

Apex lolz

Yes because a pH below 7 is acidic and that means that there is pollution

The volume that is occupied by the gas is obtained as  56 L.

We know that from the Avogadro's law, the volume that can be occupied by one mole of a gas is obtained as 22.4 L. This implies that we have to find the number of moles in the 70 g of the CO and then obtain the corresponding volume by simple proportion.

Number of moles of CO = 70.0 g/28 g/mol

= 2.5 moles

If 1 mole of the gas occupies 22.4 L

2.5 moles of the gas occupies 2.5 * 22.4/1 mole

= 56 L

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Answer:

22.5%

Explanation

% composition = Molar mass of S

------------------------ x 100

Molar mass of Na2SO4

= 32.065

------------ x 100

142

=0.225 x 100

= 22.5%

molar solubility of PbBr2 in 0. 500 M KBr solution is 4S3 = 6.60 x 10–6 . PbBr2 ionizes as Pb2+ + 2Br-, molar solubility of PbBr2 in a 0. 500 M Pb(NO3)2 solution is 0.0181 moles/lit..

If molar solubility of PbBr2 is “S”, then solubility of Pb2+ is also “S” but that of Br- would be “2S”. Ksp = [Pb2+] [Br-]2 = (S) (2S)2 = 4S3 = 6.60 x 10–6 4S3 = 6.6 x 10–6,this gives Solubility S = 1.181 x 10–2 = 0.0181 moles/lit. solid's solubility (usually referred to as its molar solubility) is expressed as the concentration of the "dissolved solid" in a saturated solution. This would simply be the concentration of Ag+ or Cl- in the saturated solution for a simple 1:1 solid like AgCl. The other way to express solubility is through molar solubility, which is defined below. It is the number of moles of solute in one litre of saturated solution and is abbreviated with a lower case's'. It is expressed in moles per litre, also known as molarity.

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Answer:

they are seed producing so can populate more areas

The skeletal equation for the reaction involving the decomposition of lead (IV) oxide on heating would be; \(2PbO_2 -- > 2PbO + O_2\)

Skeletal equations of reactions are equations showing the chemical formula of the various components of the reactions. In other words, they are equations that show the chemical symbols of all the atoms in the components participating in reactions.

The skeletal equation for lead (IV) oxide is \(PbO_2\)

The skeletal equation for lead (II) oxide is PbO

The skeletal equation for oxygen gas is \(O_2\)

Thus, the skeletal equation for the reaction involving the decomposition of lead (IV) oxide to leave (II) oxide and oxygen gas would be:

\(2PbO_2 -- > 2PbO + O_2\)

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At 25 °C, the equilibrium constant (K) for the reaction is approximately 31.729.

To calculate the equilibrium constant (K) for a reaction at 25 °C using the standard Gibbs free energy change (ΔG°'), we can use the following equation:

ΔG°' = -RT ln(K)

Where:

- ΔG°' is the standard Gibbs free energy change (given as -8.320 kJ·mol^−1 in this case)

- R is the gas constant (8.314 J·mol^−1·K^−1)

- T is the temperature in Kelvin (25 °C + 273.15 = 298.15 K)

- K is the equilibrium constant we want to calculate

Let's substitute the values into the equation and solve for K:

-8.320 kJ·mol^−1 = -8.314 J·mol^−1·K^−1 × 298.15 K × ln(K)

To simplify the units, we convert kJ to J:

-8320 J·mol^−1 = -8.314 J·mol^−1·K^−1 × 298.15 K × ln(K)

Now, we can solve for ln(K):

ln(K) = -8320 J·mol^−1 / (-8.314 J·mol^−1·K^−1 × 298.15 K)

ln(K) ≈ 3.4574

Finally, we calculate K by taking the exponential of both sides:

K = e^(ln(K)) ≈ e^(3.4574)

K ≈ 31.729

Therefore, at 25 °C, the equilibrium constant (K) for the reaction is approximately 31.729.

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Answer:

it will be none of the above because sitting doesn't cause depression, it's the environment around that person. the body language, the way they talk... Etc.

Answer:

arsenous acid

Explanation:

Answer:

Personality tests are often used to gain insight into who people are, along with what motivates them. From an employer perspective, understanding the personality of a potential hire can shed light on their work style and how they might fit into the company's work culture

Answer:

This lunch does not yet have a balanced energy ratio. Carbohydrate ought to be increased to the stipulated 45 to 65 percent.

Explanation:

Total mass = 51 + 29 + 40 =120g

The percentage of calories from each is;

Carbohydrate - 51/120 * 100 = 42.5 %

Protein - 29/120 * 100 = 24.17 %

Fat - 40/120 * 100 = 33.33 %

According to the National Academy of Sciences, a balanced energy ratio for an adult diet should contain;

Hence this lunch does not yet have a balanced energy ratio. Carbohydrate ought to be increased to the stipulated 45 to 65 percent.

Answer:

Shortest distance between 2 points is called displacemen.

Explanation:

This is because displacement means the distance between 2 points or really the negative distance.

Answer:

acceleration goes on increasing during uniform motio

this is wrong

Explanation:

Because during uniform motion acceleration is always zero .

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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The correct answer is: a. planar. Solids can be classified according to their bonding type (e.g., ionic, covalent, metallic) and their arrangement of particles in the solid lattice structure.

The arrangement of particles can be classified as planar, which refers to a two-dimensional arrangement of particles in a specific pattern within the crystal lattice. This arrangement can include layers or planes of particles stacked on top of each other.

The other options provided (atomic, electron, dipole) do not directly relate to the classification of solids based on their arrangement. Atomic refers to individual atoms, electron refers to subatomic particles, and dipole refers to the separation of positive and negative charges within a molecule.

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Answer:

\(\huge\boxed{\sf v = 62.7 \ L}\)

Explanation:

Given Data:

Mole = n = 3.38 mol

Temp = t = 269 K

Pressure = 1.19 atm

Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹

Required:

Volume = v = ?

Formula:

Pv = nRT

Solution:

Rearranging formula

\(\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(3.38)(0.08206)(269)}{1.19} \\\\v = \frac{74.6}{1.19} \\\\v = 62.7 \ L\\\\\rule[225]{225}{2}\)

Oxidization is the process of losing electrons. As iron is oxidized, it loses electrons from valence shell instead of highest energy shell because 4s orbital lies in the fourth shell, and 3d in the third shell and the 4s electrons being shielded from the nucleus by the inner 3d orbitals.

The topmost shell has the utmost energy. So, the valence shell has the highest energy.

Energy is in the form of potential energy to allow the electrons to bind to the nucleus.

4s orbital lies in the fourth shell, and 3d in the third shell and the 4s electrons being shielded from the nucleus by the inner 3d orbitals.

Thus, iron is oxidized, it loses electrons from valence shell instead of highest energy shell.

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The most appropriate reagent for the conversion of 2-hexanol to 2-hexanone is a oxidizing agent such as sodium dichromate (Na2Cr2O7) or potassium permanganate (KMnO4).

Oxidation of alcohols to carbonyl compounds (such as ketones) can be achieved using oxidizing agents like sodium dichromate or potassium permanganate. In this case, 2-hexanol can be oxidized to 2-hexanone using either of these reagents.

PCC is a mild oxidizing agent that selectively oxidizes primary alcohols to aldehydes and secondary alcohols to ketones without over-oxidizing them. In this case, 2-hexanol is a secondary alcohol, and using PCC will result in the formation of 2-hexanone.
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Among the given options, the salt that will form a basic solution upon dissolving in water is sodium nitrite (NaNO2). The correct answer is option C.

When a salt dissolves in water, it can have different effects on the pH of the resulting solution. Salts can be classified as acidic, basic, or neutral based on their behavior when dissolved.

a. Potassium bromide (KBr): KBr is a neutral salt. It is composed of the alkali metal potassium (K+) and the halide ion bromide (Br-), which do not significantly affect the pH of the solution. Thus, KBr does not make the solution acidic or basic.

b. Sodium chloride (NaCl): NaCl is also a neutral salt. It consists of the alkali metal sodium (Na+) and the halide ion chloride (Cl-). Like KBr, NaCl does not significantly affect the pH of the solution and does not make it acidic or basic.

c. Sodium nitrite (NaNO2): NaNO2 is the salt that forms a basic solution. It is composed of the alkali metal sodium (Na+) and the nitrite ion (NO2-). Nitrite ions can undergo hydrolysis in water, leading to the formation of hydroxide ions (OH-) and making the solution basic.

Therefore, among the given options, only sodium nitrite (NaNO2) will form a basic solution upon dissolving in water.

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Answer:

probably B, a new habitat is created that supports several kinds of life.

Explanation:

Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.