An unknown gas with a mass of 205 g occupies a volume of 20. 0 L at 273 K and 1. 00 atm. What is the molar mass of this compound?

Answer:

yes

Explanation:

CO2 is soluble because water molecules are attracted to these polar areas. The bond between carbon

The dissolution equation of the slightly soluble compound al(oh)3 if the solubility product expression is Ksp = [Al3+][OH–]3 will be:

Al(OH₃)\(_{(s)}\) ⇄ Al³⁺\(_{(aq)}\) + 3OH⁻\(_{(aq)}\)

A compound is created when two or more elements combine chemically in a specific mass ratio. Compounds are substances made up of two or more different types of elements in a specific proportion of their atoms. When the elements combine, some of their individual properties are lost and the newly formed compound has new properties.

Chemical formulas serve as a representation of compounds. A chemical formula is a symbolic representation of the atom compositions that make up a specific chemical compound. The chemical formula of water is H2O, which indicates that two hydrogen atoms and one oxygen atom have combined to form one molecule of H2O.

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Acetals can be hydrolyzed using catalytic acid to produce a carbonyl compound and alcohol. If the acid concentration is increased, acetal can be hydrolyzed back to its initial aldehyde or ketone form.

This mechanism occurs in the opposite direction of the acetal formation mechanism. The hydrolysis of each acetal generates a carbonyl compound and an alcohol.What are Acetals?Acetals are organic compounds that are formed by the reaction of an aldehyde or ketone with two molecules of alcohol, and they have the following general structure: R1R2C(OR')2.Acetals can be regarded as derived from hemiacetals, which are formed by the reaction of an aldehyde or ketone with one molecule of alcohol.The carbonyl carbon in an acetal is bonded to two alkoxide (OR) groups, while the carbonyl carbon in a hemiacetal is bonded to only one. As a result, acetals are more stable than hemiacetals. Acetals are widely used in organic synthesis, including as protecting groups for carbonyl groups in reactions that would otherwise destroy them.Example:Acetal hydrolysis occurs when an acid catalyst is used to cleave the two ether bonds in the molecule. When an acetal is hydrolyzed with an acid catalyst such as H2SO4, a carbonyl compound and an alcohol are formed.Example:H2SO4 is added to the acetal, which hydrolyzes it, producing an aldehyde or ketone and two alcohol molecules. For example, if dimethyl acetal is hydrolyzed, it will yield acetone and two methanol molecules.

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Answer:

Today's classification is called Linnaean system of classification. Is is important because it is according to the data of evolutionary studies and modern data.

Explanation:

It classifies plants, animals, algae fungi , and bacteria in a specific groups. It is important because this classification is somehow verified by the genetics and molecular biology.

7 levels of Linnaean classification system.

Kingdom

/Phylum

Class

Order

Family

Genus

Specie

Answer:

Explanation:

For many species of frogs, a male's mating call is the most well-recognized method of attracting females. ... Other species of females prefer males who call next to a pre-made nest. Females are on the lookout for males who go the extra mile when calling, since they presume these males are good quality mates.

Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

Explanation:

The given intermediate chemical reactions do not lead to a single overall chemical equation for smog. Instead, they represent a combination of various reactions that contribute to the formation of different components of smog, such as nitrogen oxides (NOx) and ozone (O3).

The first reaction given is:

N2 + 3O2 + 2O3 + 2O → 8NO + 4NO2 + 2O3

This reaction represents the formation of nitrogen oxides and ozone from the reaction of nitrogen and oxygen with ozone and oxygen radicals. Nitrogen oxides and ozone are major components of smog.

The second reaction given is:

N2 + 3O2 + O3 + O → 9NO + 3NO2 + 2O3

This reaction also represents the formation of nitrogen oxides and ozone, but with a different stoichiometry.

The third reaction given is:

N2 + 3O2 → 2NO + O2

This reaction represents the direct formation of nitrogen oxides from the reaction of nitrogen and oxygen.

The fourth reaction given is:

N2 + 2O2 → 2NO2

This reaction represents the direct formation of nitrogen dioxide from the reaction of nitrogen and oxygen.

Overall, the formation of smog is a complex process that involves the interaction of various chemical reactions and environmental factors. Therefore, there is no single overall chemical equation that describes the formation of smog.

Answer: 2.04

Explanation:

Answer:

Approximately \(0.821\; \rm mol\).

Explanation:

Look up the relative atomic mass of \(\rm Ba\), \(\rm O\), and \(\rm H\) on a modern periodic table:

Calculate the formula mass of \({\rm Ba(OH)_2}\):

\(\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}\).

Calculate the number of moles of \({\rm Ba(OH)_2}\) formula units in that \(235\; \rm g\) of this compound:

\(\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}\).

Calculate the volume of a \(c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}\) with approximately \(n({\rm Ba(OH)_2}) = 1.37159\; \rm mol\) of the solute:

\(\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}\).

A reaction to be spontaneous,overall cell potential must be positive.

(A)The metabolite which would spontaneously reduce oxaloacetate (OAA) is:

alpha-ketoglutarate

(B)The two half cell reactions are as follows:

Reduction half reaction:

Oxaloacetate + 2 H+ + 2 e- --> malate

Oxidation half reaction:

alpha-ketoglutarate --> Succinate + CO2 + 2 H+ + 2 e-

Overall resulting balanced reaction for the reduction of OAA :

Oxaloacetate +alpha-ketoglutarate --> malate + Succinate + CO2

(C)the standard reduction potential for the reaction chosen in (B):

+0.67-0.17 = +0.50 V

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Answer:

0.136 L = 136 mL

Explanation:

18.0M = 18.0 mol/L

2.45 mol /(18.0 mol/L) = 0.136 L = 136 mL

Answer: 22: C

              23: A

              24: A

              25: D

              26: B              

Explanation: I hope that this helped :)

Answer:

22) b. stainless steel.

23) c. they are all substances.

24) b. a compound can only be separated into its components by chemical means.

25) a. substances are compounds, mixtures are not.

26) b. capitalized

extra: not 100 percent sure of 25

The empirical formula of the original compound given the combustion analysis data is CH₂O

Mass of C = (12 / 44) × 51.29

Mass of C = 13.99 g

Mass of H = (2 / 18) × 20.99

Mass of H = 2.33 g

Mass of O = (mass of compound) – (mass of C + mass of H)

Mass of O = 35 – (13.99 + 2.33)

Mass of O = 18.68 g

Divide by their molar mass

C = 13.99 / 12 = 1.1658

H = 2.33 / 1 = 2.33

O = 18.68 / 16 = 1.1675

Divide by the smallest

C = 1.1658 / 1.1658 = 1

H = 2.33 / 1.1658 = 2

O = 1.1675 / 1.1658 = 1

Thus, the empirical formula of the compound is CH₂O

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The percentage of oxygen is 53.33%.

Given that the constant composition of sugar, a compound containing carbon, hydrogen and oxygen is 40.0% carbon and 6.67% hydrogen.To find the percentage of oxygen, we should know the mass percentage of each element in the compound. Therefore, the percentage of oxygen can be determined by subtracting the sum of carbon and hydrogen from 100%.Therefore, the percentage of oxygen = 100% - (40.0% + 6.67%) = 53.33%.Hence, the percentage of oxygen in the given compound is 53.33%.

Therefore, the percentage of oxygen is 53.33%.

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Answer:

10⁻³⁶ s

Explanation:

There is much speculation, but many scientists believe the universe started expanding about 10⁻³⁶ s  after the Big Bang.

The balanced chemical equation for the reaction between sodium (Na) and water (H2O) is:

2Na + 2H2O → 2NaOH + H2

This means that for every 2 moles of sodium added, 1 mole of hydrogen gas (H2) is produced. Therefore, to calculate the number of moles of H2 produced, we need to first determine the number of moles of sodium added and then use the mole ratio from the balanced equation.

In this case, we are given that 4.0 moles of Na is added and 1.2 moles of H2O is present. Since Na and H2O react in a 1:2 ratio, we can determine the number of moles of NaOH produced by dividing the number of moles of H2O by 2:

1.2 mol H2O ÷ 2 = 0.6 mol NaOH

Since 2 moles of Na produce 1 mole of H2, we can use a mole ratio to calculate the number of moles of H2 produced:

4.0 mol Na × (1 mol H2 / 2 mol Na) =2.0 mol H2

Therefore, 2.0 moles of H2 will be produced when 4.0 mol Na is added to 1.2 mol H2O.
When 4.0 mol of Na reacts with 1.2 mol of H2O, the balanced chemical equation is:

2 Na + 2 H2O → 2 NaOH + H2

From the balanced equation, you can see that 2 moles of Na reacts with 2 moles of H2O to produce 1 mole of H2. To find the number of moles of H2 produced, first determine the limiting reactant:

Na: 4.0 mol / 2 = 2.0 (sets of reactants)
H2O: 1.2 mol / 2 = 0.6 (sets of reactants)

H2O is the limiting reactant. Now calculate the moles of H2 produced:

0.6 (sets of reactants) × 1 mol H2 = 0.6 mol H2

So, 0.6 moles of H2 will be produced when 4.0 mol of Na is added to 1.2 mol of H2O.

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Answer:

\(5850\ \text{cal}\)

Explanation:

m = Mass of water = 4500 g

c = Specific heat of water = \(1\ \text{cal/g}^{\circ}\text{C}\)

\(\Delta T\) = Change in temperature of water = \(1.3^{\circ}\text{C}\)

Heat is given by

\(q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}\)

A slice of the bread contains \(5850\ \text{cal}\).

5.26 years later, that 50 grams of cobalt remain is the correct prediction that chemist can predict exactly which cobalt atom is going to decay.

A chemical element with the atomic number 27 and the symbol Co is cobalt. With the exception of minor concentrations found in alloys of naturally occurring meteoric iron, cobalt is only ever found in the Earth's crust in a chemically mixed state. Because of its look, hardness, and resistance to oxidation, cobalt is frequently used in electroplating.

Destructive dissolution is what is meant by the words decay, decompose, rot, putrefy, and spoil. The term "decay" refers to a gradual deterioration from a sound or perfect state. a dilapidated home. Decomposition causes a breakdown by chemical transformation and corruption when applied to organic substance. Because objects that are rotting or decaying typically don't look good or smell good, decay seems like an unpleasant process.

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To compare the effect of the -OH group on the surface tension, we should compare two liquids that differ only in the presence or absence of the -OH group. This will help isolate the impact of the -OH group on surface tension while keeping other factors constant.

In this case, we can compare ethanol (CH3CH2OH) and pentane (C5H12). Ethanol contains the -OH group, while pentane does not.

By comparing these two liquids, we can observe the specific influence of the -OH group on surface tension. Ethanol's -OH group introduces hydrogen bonding, which can increase intermolecular forces and consequently affect surface tension. Pentane, lacking the -OH group, does not exhibit hydrogen bonding to the same extent.

By examining the surface tension of ethanol and pentane, we can attribute any differences primarily to the presence or absence of the -OH group, allowing for a more focused comparison of its effect.

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The lewis electron-dot diagram which represents the bonding in potassium iodide, KI is give in image attached.

The correct answer choice is option 1.

The lewis structure can simply be defined as those diagrammatic chemical representations which describes the bonding between atoms in a particular molecular structure of a chemical substance. From the context of the above given task, the structure is bonded by eight different electrons.

The importance of lewis electron-dot structures cannot be overemphasized. Some of its significances are as follows:

In conclusion, we can now confirm from the explanation given above that potassium iodide is solid chemical compound.

The complete image of the options of the question is also attached.

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A homogeneous mixture can exist as D)Solid, liquid, or gas.

A homogeneous mixture is a collection of two or more substances that are uniform throughout their existence.

These mixtures are blended together so that the individual substance present in the mixture could not be easily distinguished or seen.

Such mixtures can exist in any state of matter. This is because a homogeneous mixture is a mixture in which the composition is uniform throughout.

If the homogeneous mixtures are seen in liquids it is called homogeneous solutions. However, homogeneous mixtures can exist only one phase at a time. More than two phases do not coexist.

Hence the correct option is D) and the answer is, Solid, liquid, or gas.

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Answer:

-ide

Explanation:

Ionic compounds are made up of two parts: a cation and an anion. The cation is positively charged (less electrons) and the anion is negatively charged (more electrons). When naming these compounds, if the anions are nonmetals, they have their endings dropped in order to add the new ending: -ide.

Examples,

CaCl₂ ----> calcium chloride

BaF₂ -----> barium fluoride

MgO -----> magnesium oxide

The two liquids being measured when obtaining an absorbance spectrum are called the absorbance (A) and the transmittance (T) solutions.

Absorbance is measured using a spectrophotometer or microplate reader, that's an device that shines light of a special wavelength via a sample and measures the quantity of mild that the pattern absorbs.

Absorption spectra (additionally called UV-Vis spectra, absorbance spectra and electronic spectra) display the change in absorbance of a sample as a characteristic of the wavelength of incident light, and are measured the usage of a spectrophotometer.

Definition of absorption spectrum: an electromagnetic spectrum wherein a decrease in depth of radiation at precise wavelengths or ranges of wavelengths characteristic of an soaking up substance is manifested specially as a sample of darkish lines or bands.

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Answer:  Discover ZEISS Solutions

Investigate soft materials like polymers, catalysts, coatings and chemicals to gain a better understanding of their properties. Analyze surface topography, chemical composition, tensile deformation and fracture patterns. Scroll down this page and discover microscopy characterization techniques and solutions from ZEISS enabling you to perform soft materials research in your lab efficiently.

Answer: Discover ZEISS Solutions

Investigate soft materials like polymers, catalysts, coatings, and chemicals to gain a better understanding of their properties. Analyze surface topography, chemical composition, tensile deformation, and fracture patterns. Scroll down this page and discover microscopy characterization techniques and solutions from ZEISS enabling you to perform soft materials research in your lab efficiently.

Answer:

detail is given below.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O  → C₆H₁₂O₆ + 6O₂

The given equation is balanced chemical equation of photosynthesis. There are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

If equation is not balanced,

CO₂ + H₂O  → C₆H₁₂O₆ + O₂

It can not follow the law of conservation of mass because mass is not equal on both side of equation.

The atomic mass of an element is a weighted average of its isotopes in which the sum of the abundance of each isotope is equal to 1 or 100%.

Let fraction of N-15 be x

then fraction of N-14 = 1-x

Formula for Calculating Isotope:

15.001x + 14.00031(1-x)=14.0067

on calculation:

x = 0.006403

so, % = 0.006403 x 100  =  0.6403 %

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Yes, a substance can have multiple routes of exposure. The route of exposure can affect the way in which a substance affects the body.

Routes of exposure refer to the ways in which a substance can enter the body. These can include:

1. Inhalation: breathing in the substance through the lungs

2. Ingestion: swallowing the substance

3. Dermal contact: skin contact with the substance

4. Injection: injection of the substance into the body through a needle or other means

Some substances can have multiple routes of exposure. For example, chemicals used in industrial processes can be inhaled as a gas or a vapor, ingested through contaminated food or water, or absorbed through the skin.

For example, inhalation of certain substances may cause respiratory problems, while ingestion of the same substance may affect the digestive system.

Therefore, it is important to consider all possible routes of exposure when evaluating the potential health effects of a substance.

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They form a new compound with new properties from the original element.

The same components are always present in the same ratios in a compound. Compounds' characteristics differ, sometimes significantly, from the characteristics of the constituent . This is due to the fact that when elements in such a compound combine, a whole new substance with distinct features results.

A compound contains special characteristics that set it apart from the characteristics of its basic elements.

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The Answer For Your Question is:

A) F

Answer:

The correct formula is...

Nal

The two statements that correctly describe effusion and diffusion are:

Effusion and diffusion are related but distinct processes. Diffusion is the gradual mixing of two substances due to the random motion of their particles, while effusion is the process of a gas escaping through a small opening into a vacuum. Both processes are influenced by the molar mass of the gas involved, with lighter gases diffusing and effusing faster than heavier gases.

This is because the speed of gas particles is inversely proportional to the square root of their molar mass. Understanding these concepts is important in fields such as chemistry, physics, and engineering, where the behavior of gases is critical to many processes.

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