what is the percent composition by mass of both carbon and hydrogen in c10h22? find answer

Answer:

4 Adolescence

Explanation:

Adolescence is the human development stages occurs after childhood. Hence option 4 is correct.

Human development is defined as expanding people's freedoms and opportunities while also enhancing their well-being. The true freedom that everyday individuals have to choose who they are, what they do, and how to live is what human growth is all about. This discipline tries to comprehend the numerous transformations that people and their relationships go through as they learn and develop.

The youngster reaches puberty during the adolescent stage. A abrupt rise in hormones causes a variety of emotional and mental changes throughout this time. The body's major and secondary sex traits develop during a significant growth spurt phase.

Thus, adolescence is the human development stages occurs after childhood. Hence option 4 is correct.

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Glycerol and fatty acids are the building blocks for lipids.

What are lipids?

Lipids are a class of organic molecules that include fats, oils, and waxes. They are essential to life in that they serve as structural components of cell membranes, insulation, and energy storage molecules.

There are several types of lipids, but all of them are composed of two types of building blocks: glycerol and fatty acids. Glycerol is a three-carbon alcohol with a hydroxyl group attached to each carbon. Fatty acids, on the other hand, are long hydrocarbon chains with a carboxylic acid group at one end. In lipids, glycerol is typically linked to three fatty acids via ester bonds to form triglycerides. This is the primary way that lipids are stored in the body.

Other types of lipids, such as phospholipids and steroids, have different structures but still contain glycerol and/or fatty acids as building blocks. Overall, lipids are an incredibly important class of biomolecules that play a variety of roles in the body. Glycerol and fatty acids are the basic building blocks for all lipids.

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Answer:

11.11%

Explanation:

The concentration of the solution can be calculated by dividing the mass of the solute (common salt) by the mass of the solvent (water) and then multiplying by 100.

The concentration of the solution is:

(50g / 450g) x 100 = 11.11%.

A 0.425g sample of propane was mixed with excess oxygen in a calorimeter containing 98.72 g of water. The system was ignited and the temperature rose from 18.29ºC to 26.85ºC.  the molar enthalpy of propane is 393851.1 J/mol

The mass of propane = 0.425 g

molar mass of propane = 44 g/mol

moles = mass / molar mass

         = 0.425 / 44

         = 0.009 mol

ΔH = mc ΔT

ΔH  = n ΔHsol

ΔHsol = mc ΔT / n

          = 98.72 × 4.18 ( 26.85 - 18.29 ) / 0.009

molar enthalpy of solution = 393851.1 J/mol

Thus, A 0.425g sample of propane was mixed with excess oxygen in a calorimeter containing 98.72 g of water. The system was ignited and the temperature rose from 18.29ºC to 26.85ºC.  the molar enthalpy of propane is 393851.1 J/mol

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Answer:

Explanation:

The pH of a solution can be found by using the formula

\(pH = - log [ {H}^{+} ]\)

From the question we have

\(pH = - log(1.0 \times {10}^{ - 2} ) \\ = 2\)

We have the final answer as

Hope this helps you

If the rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then order of the reaction with respect to this reactant is  1/3

Rate of reaction is the speed at which a chemical reaction proceeds

Here given data is

Rate of reaction = 9.6

Concentration of reactant  = 3.1

We have to calculate order of the reaction = ?

So we can write

R = K[C]ⁿ

Where R is the reaction rate and K is a constant

Here C is the concentration of the reactant

rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then

9.6 = K× [3.1]ⁿ

Dividing this equation we get

1/9.6 = 1/3.1ⁿ

3n = 1

n = 1/3

Then the order of the reaction with respect to this reactant is 1/3

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The symbol that of sodium atom that will be obtained by adding one proton to 23Na is 24Na.

Isotope is any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

Thus, isotopes have the same atomic number but a different mass number.

Isotopes of the same element have atoms with the same number of protons but different numbers of neutrons.

Examples of isotopes are Carbon-12 and Carbon-14 where one posseses 6 neutrons and the other possesses 8 neutrons.

According to this question, an isotope of sodium has a formula of 23Na. This means that when a proton is added to the isotope, the formula of the sodium isotope will change by adding 1 to the mass number.

Therefore, the formula of the isotope will change from 23Na to 24Na.

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the lattice energy of MgH2() is 2791 kJ/mol with a series of step when the Enthalpies of formation for calcium hydrided is given.

An article publishing charge (APC) is required of authors or research funders to cover publication costs in open access journals that do not charge subscription fees. This guarantees that everyone will be able to access your article promptly and without charge in the future.

Solution:

the lattice energy of MgH2() is :

ΔHf(−75. 3 kJ/mol )  =S+0.5D+IE+EA+U

ΔHf(−75. 3 kJ/mol )= 2791 kJ/mol

The papers published in MDPI Special Issues are of extremely high quality! When I published my research with MDPI (Energies Journal), it was a wonderful experience. Both the submission of the manuscript and the timing of publishing were excellent.

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Answer:

- Water from beaker will move to the tube

Explanation:

Total percentage of water in the beaker;

\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)

Total percentage of water in dialysis tube;

\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)

So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.

Percentage of water moving to tubing;

\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)

Percentage of salt moving from tubing to beaker

\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)

Answer:

2.

63.9 cm2

Explanation:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.06 in this number only one significant figure present which is 6.

Zero between the non zero digits are consider significant like 108 consist of three significant figures.

The zeros at the right side e.g 240000 are also significant. There are six significant figures are present.

When we add or subtract the values the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.  For example,

The difference between 7.69 and 4.0.

7.69 - 4.0 = 3.7

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

For example in given q:

52.6 cm × 1.214 cm = 63.9 cm²

Answer:

607.9616 grams

Explanation:

Hope this helped!!

The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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The given statement  "Scientific models can never be changed " is false because the scientific model changed when the new discoveries are made.

The scientific models are based on the current scientific knowledge and the scientific will have to be changed when the new discoveries are made. These were not the replacement for the experimentation, these were used in the conjunction with the experimentation to the further understanding of the  concept or the process.

Thus, the scientific model has to be changed when the scientific understanding will changes. The scientific models are based on the set of the observations, and the every model has its flaws.

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Without knowing the specific reactants and conditions of the reactions you are considering, it is not possible for me to accurately predict the type of substitution mechanism or compare the expected rates of the reactions.

In general, the type of substitution mechanism that occurs in a given reaction depends on a variety of factors, including the nature of the reactants, the solvent, and the temperature and concentration of the reactants. The rate of a reaction can also be influenced by these factors, as well as by the presence of catalysts or other substances that may affect the rate of the reaction.

To identify the mechanism of each reaction and compare the rates of the reactions, you would need to consider these factors and use information about the reactants and conditions of the reactions to make predictions about the mechanisms and rates. You could then use this information to draw the organic products of the reactions and compare the expected rates.

Answer:

my answer us that filter is used to seperate solution or solid and liquid combination

The equilibrium constant, denoted as K, is a mathematical representation of the ratio of the concentrations (or pressures) of products to reactants at equilibrium in a chemical reaction. It is expressed using the law of mass action and helps to quantify the extent of a chemical reaction.

To determine the equilibrium concentration of nitrous acid (HNO₂) in a solution with a pH of 1.65, we need to use the dissociation constant (Ka) and the relationship between pH and the concentration of H₃O⁺ ions.

First, let's calculate the concentration of H₃O⁺  ions in the solution. The pH is given as 1.65, which means the concentration of H₃O⁺  ions can be calculated using the formula:

[H₃O⁺ ] = 10^(-pH)

[H₃O⁺ ] = 10⁻¹ .⁶⁵

[H₃O⁺] ≈ 0.028

Now, let's assume the initial concentration of nitrous acid (HNO₂) is x. As nitrous acid dissociates, it forms H₃O⁺ and the conjugate base, NO2-.

HNO₂ ⇌ H₃O⁺ + NO²⁻

The dissociation constant (Ka) for nitrous acid is given as 4.5 × 10⁻⁴, which can be used to write the equilibrium expression:

Ka = [H₃O⁺][NO₂⁻] / [HNO₂]

Since we assumed the initial concentration of HNO₂ to be x, the equilibrium concentration of H₃O⁺ and NO²⁻ will also be x.

Substituting the values into the equilibrium expression:

4.5 × 10⁻⁴ = (0.028)(x) / x

Simplifying the equation:

4.5 × 10⁻⁴ = 0.028

This equation shows that the value of x cancels out. Therefore, the equilibrium concentration of HNO₂ does not depend on the initial concentration and is solely determined by the value of Ka.

Hence, the equilibrium concentration of nitrous acid (HNO₂) in the solution is approximately 4.5 × 10⁻⁴ M.

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Answer:

10.081g÷12.5cm³ = 0.806g/cm³

The compound that was added to the Miller-Urey experiment to allow pre-cell enclosures to form was ammonia.

In the Miller-Urey experiment, Stanley Miller and Harold Urey aimed to simulate the conditions of the early Earth's atmosphere to investigate the origins of life. They created an apparatus that contained a mixture of gases, including methane, ammonia, hydrogen, and water vapor. The mixture was then exposed to an electric spark to simulate lightning, and the resulting products were analyzed.

Ammonia played a crucial role in the formation of pre-cell enclosures, such as lipid bilayers, which are essential components of cell membranes. The ammonia in the mixture reacted with the other gases and water vapor to produce a variety of organic compounds, including amino acids, which are the building blocks of proteins. The amino acids then polymerized to form long chains, which eventually led to the formation of lipids. These lipids could then self-assemble into enclosed structures, such as vesicles, that are similar to the cell membranes of modern cells.

Overall, the addition of ammonia to the Miller-Urey experiment played a significant role in creating the conditions that allowed for the formation of pre-cell enclosures, which are critical steps in the origins of life.

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The atmosphere is the thin layer of gases that surrounds the Earth and provides a protective layer for all life on the planet. The correct answer is 1.

It is composed mainly of nitrogen (78%) and oxygen (21%), along with other gases like argon, carbon dioxide, and neon. This layer helps to regulate the Earth's temperature and protect it from harmful radiation from the sun. The atmosphere also plays a critical role in the water cycle, helping to move water vapor from one part of the planet to another. Humans and many other living organisms depend on the air in the atmosphere to breathe and survive, making it a vital part of the biosphere. Hence Correct answer is 1.

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--The complete question is, What part of the biosphere contains the AIR that we breathe?

1. Atmosphere

2. Lithosphere

3. Hydrosphere

4. Stratosphere --

Answer:

So yes, two objects of the same substance, but with a difference size and/or shape can have the same density, it all comes down to the weight, the volume and the temperature to determine your density, that is assuming your object isn't hollow of course.

Explanation:

Answer:

it is possible

Explanation:

The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). Density equals the mass of the substance divided by its volume; D = m/v. Objects with the same volume but different mass have different densities.

Reduction occurs at the cathode in an electrochemical cell. To determine which transformation could take place at the cathode, we need to compare the standard reduction potentials (E°) of the given half-reactions.

The half-reactions are:

\(a. H2O + 1 e- → H2O2, E° = +0.68 V\\b. 2 Br- → Br2 + 2 e-, E° = +1.09 V\\c. 2 H2O + 2 e- → O2 + 4 H+ , E° = +1.23 V\\d. SO42- + 2 e- → SO32-, E° = +0.17 V\\e. Fe2+ + 1 e- → Fe3+, E° = -0.77 V\)

In order for a reduction reaction to occur at the cathode, the reduction potential of the half-reaction must be more positive than the reduction potential of the half-reaction at the anode. The half-reaction with the more positive reduction potential will be reduced (gain electrons), while the half-reaction with the less positive reduction potential will be oxidized (lose electrons).

Therefore, from the given half-reactions, the half-reaction that could take place at the cathode is:

b. 2 Br- → Br2 + 2 e-, E° = +1.09 V

This is because the reduction potential of this half-reaction is the highest among the given options, indicating that it is the most favorable reduction reaction.

Therefore, Br- will be reduced to form Br2 at the cathode, while the corresponding oxidation reaction (Br2 → 2 Br-) will take place at the anode.

Option (b) is the correct choice.

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Answer:

2N2 + 5O2 => 2N2O5

4Fe + 3O2 => 2 Fe2O3

H2 + Cl2 => 2 HCl

Explanation:

Lithium

Sodium

group one elements are highly reactive

The dissociation equations are shown as;

a) \(HCl ------ > H^+ + Cl^-\)

b) \(H C_{2} H_{3}O_{2} ---- > C_{2} H_{3}O_{2} ^- +H^+\)

C) \(NH_{4} ----- > NH_{3} + H^+\)

D) \(C_{6} H_{5} NH_{3} ^+ ------- > C_{6} H_{5} NH_{2} + H^+\)

E) \([Al(H_{2} O)_6}] ^{3+} ------ > Al^{3+}\)

The term dissociation has to do with the procedure by which a substance can be broken up into its components. The components of a substance are those that have to come together so as to form the compound.

When the compound is to be broken up, the components that came together to make up the compound can broken up and then we have the original compounds tat we have at the start of the reaction.  In this case, the decomposition equations have been shown with the exclusion of water.

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Answer:

A D F

Explanation:

look at attachment if you don't believe me

Answer:

yes

Explanation:

salt is made up of two minerals:

sodium and chlorine

The reaction that takes place in a nuclear fission reactor is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.

A nuclear fission reactor is the place where nuclear chain reactions occur that produce energy by fission.

Nuclear fission is the nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.

Therefore, the option that involves the splitting of atoms into smaller ones is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.

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Answer:

1.CBr4

2.CIF

Explanation:

Covalent compound are formed by sharing of electron and ionic compound formed by complete transfer of electron. The chemical formula for Carbon tetrabromide is CBr₄ and for Chlorine monofluoride is ClF.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Ionic compounds are more stronger than covalent compound. Ionic compounds have higher melting and boiling point than covalent compounds.

The chemical formula for Carbon tetrabromide is CBr₄, tetra means four. The chemical formula for Chlorine monofluoride is ClF, mono means one.

Therefore, the chemical formula for Carbon tetrabromide is CBr₄ and for  Chlorine monofluoride is ClF.

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Answer:

2, strong acid

Explanation:

Data obtained from the question. This includes:

[H+] = 0.01 M

pH =?

pH of a solution can be obtained by using the following formula:

pH = –Log [H+]

pH = –Log 0.01

pH = 2

The pH of a solution ranging between 0 and 6 is declared to be an acid solution. The smaller the pH value, the stronger the acid.

Since the pH of the above solution is 2, it means the solution is a strong acid.

Nuclear fusion is the process that creates chemical elements lighter than iron. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light.

A material is considered an element if it cannot be divided into two or maybe more simpler compounds by any kind of chemical process, including the use of light or heat. For instance, when a piece of gold is melted, the gold element still melts and is there.

The lightest element is hydrogen. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light. The star keeps doing this until there are no more hydrogen atoms available. When this occurs, the star produces Beryllium by fusing the Helium atoms. When the helium runs out Carbon is created by combining Beryllium in the star. This procedure keeps going until the star produces iron. The star then explodes. Our dwellings and buildings are made out of all those atoms.

Therefore, nuclear fusion is the process that creates chemical elements lighter than iron.

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