a compound is found to be 64.9% carbon, 13.5% hydrogen and 21.6% oxygen. if its molecular mass is 74 g/mol, the molecular formula is

Answer:

It is Soluble

Explanation:

Name- Magnesium acetate

It dissolves easily in water and alcohol.

Answer: everybody report fNnasks he doesn't answer nobody question if you see it like you told me do it yourself science is super easy

Explanation:

Answer:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Explanation:

Chemical change refers to a fundamental transformation in which atoms and molecules rearrange their bonds and configurations, resulting in the formation of new substances with distinct properties.

During a chemical change, the original molecules may break apart, combine, or rearrange their constituent atoms to create different molecules, often accompanied by the absorption or release of energy. This process involves the conversion of reactant molecules into product molecules through various chemical reactions, reflecting alterations at the atomic level.

Unlike physical changes, which involve modifications in state or appearance without altering the chemical composition, chemical changes lead to the creation of novel substances, showcasing the dynamic and intricate nature of molecular interactions and the fundamental behaviors of matter.

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Approximately 402.34 mL of concentrated HCl solution should be used to make 4.60 L of an HCl solution with a pH of 1.90.

To determine the volume of concentrated HCl solution needed, we can follow these steps:

Calculate the amount of HCl needed: The desired pH of the solution is 1.90, which corresponds to a concentration of H+ ions of 10^(-pH), or approximately 0.012589. This concentration represents the molar concentration of HCl needed in the final solution.

Calculate the moles of HCl needed: Using the molar mass of HCl, which is approximately 36.461 g/mol, we can convert the desired concentration from step 1 into moles of HCl.

Calculate the mass of the concentrated HCl solution needed: Since the concentrated HCl solution is 36.0% HCl by mass and has a density of 1.179 g/mL, we can use its density to calculate the mass of the HCl needed, and then divide by its mass percentage to get the total mass of the concentrated HCl solution required.

Calculate the volume of concentrated HCl solution needed: Finally, we can divide the mass of concentrated HCl solution calculated in step 3 by its density to obtain the volume of concentrated HCl solution needed in mL. This comes out to be approximately 402.34 mL. So, approximately 402.34 mL of concentrated HCl solution should be used to make 4.60 L of an HCl solution with a pH of 1.90.

This calculation assumes ideal behavior of HCl in solution and neglects any other factors that may affect the actual pH of the resulting solution.

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0.005688 mol of chloride ions are present in 0.2530 g of aluminum chloride (AlCl₃).

Given: Mass of aluminum chloride (AlCl₃) = 0.2530 g

           Molar mass of AlCl₃ = 133.34 g/mol

The molar mass of AlCl₃ is calculated as follows:

      Molecular mass of AlCl₃ = Atomic mass of Al + Atomic mass of Cl × 3

          = 27.0 g/mol + 35.5 g/mol × 3

           = 27.0 g/mol + 106.5 g/mol

           = 133.5 g/mol

To calculate the number of moles of chloride ions in 0.2530 g of aluminum chloride, we first need to find the number of moles of aluminum chloride. Then we can multiply it by the ratio of moles of chloride ions to moles of aluminum chloride.

This ratio is 3:1 because each molecule of AlCl₃ contains three chloride ions and one aluminum ion.

So, Number of moles of AlCl₃ = Mass of AlCl₃ / Molar mass of AlCl₃= 0.2530 g / 133.5 g/mol= 0.001896 mol

Number of moles of chloride ions = Number of moles of AlCl₃ × (3 moles of Cl⁻ / 1 mole of AlCl₃)

       = 0.001896 mol × 3= 0.005688 mol of Cl⁻

.

Hence, 0.005688 mol of chloride ions are present in 0.2530 g of aluminum chloride (AlCl₃).

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The joint in the human body which is similar to the chicken wing joint is elbow joint. There is some similarities in the arm joint movement of chicken and humans.

Joints are the connecting parts for bones. Thus two bones are connected by joints. The skeletal system is a web of different living tissues that gives the human body its structure and protects organs.

Additionally, it is where blood cells are created. Due to their similar evolutionary history as vertebrates, chicken wings are homologous to the upper limb of humans; that is, they share many of the same features.

In order to connect the shape of muscles, bones, and joints to their function, we can analyze a chicken wing. The structure, tissues and some movements of elbow joint of humans is similar to that of chicken wing joint.

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Answer:

Explanation:

Aluminium hydroxide is amphoteric. 3 HCl + Al(OH)3 → AlCl3 + 3 H2O. In bases, it acts a Lewis acid by taking an electron pair from the hydroxide ions: Al(OH)3 + OH− → Al(OH)

Explanation:

Covalent compounds (solid, liquid, solution) do not conduct electricity. Metal elements and carbon (graphite) are conductors of electricity but non-metal elements are insulators of electricity. Ionic bonds are the electrostatic attraction between positive and negative ions.

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Answer:

Molarity to moles to mass.

0.250 L (1.8 mol/L) = 0.45 mol NaOH

0.45 mol (39.99 g/mol) = 18.00 g NaOH

Explanation:

Solvation is the process of dissolving.

Dissociation is the separation of a substance into charged components during dissolution.

Dissolution (dissolving), which simply refers to becoming solvated by the solvent, is a subset of dissociation, which is particularly the separation of two charged ions in solution. When the solvent completely envelops each individual solute molecule, solvation takes place. By definition, something that is dissociated in a solvent must be dissolved in it. For instance, the salt dissociates in water, which is how it dissolves in water. In water, ethanol dissolves but does not dissociate; it remains ethanol.

The Van't Hoff factor is a tool used to compare the real number of moles of solute injected to create a solution to the apparent amount produced by colloidal characteristics.

Van't Hoff factor's value is:-

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The idea of the atomic nature of matter was first developed by John Dalton.

He introduced the atomic theory, which proposed that matter was made up of tiny, indivisible particles called atoms. This theory was based on his observations and experiments on the behavior of gases

.Dalton's atomic theory had several postulates that helped explain the properties of matter. These postulates were:

All matter is made up of atoms, which are tiny, indivisible particles

.Each element is composed of atoms that are identical in size, shape, and chemical properties.

Atoms of different elements have different sizes, shapes, and chemical properties.

Atoms combine in fixed ratios to form compounds, and the ratios of their masses are related by whole numbers.

Atoms are indestructible and cannot be created or destroyed in chemical reactions

.However, Dalton's atomic theory was later modified and expanded upon by other scientists, including J.J. Thomson, Ernest Rutherford, and Niels Bohr, as new discoveries about the structure and behavior of atoms were made.

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Hot, molten rock crystallizes and hardens to form igneous rocks, which are named after the Latin word for fire.

Near active plate borders or hot places, the melt begins its journey deep within the Earth before rising to the surface.

Depending on where the molten rock hardens, igneous rocks are classified as either intrusive or extrusive.

Intrusive Igneous Rocks: When magma is imprisoned deep inside the Earth, intrusive, or plutonic, igneous rocks are created. Massive globules of molten rock are rising to the surface.

Thus, Hot, molten rock crystallizes and hardens to form igneous rocks, which are named after the Latin word for fire.

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Answer:

B

Explanation:

A rolling skateboard slows down because some of it's kinetic energy changes to heat

The best example of the law of conservation of energy is: A rolling skateboard slows down because some of its kinetic energy changes to heat. Therefore, option B is correct.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be converted from one form to another. In this case, the kinetic energy of the rolling skateboard is being converted into thermal energy (heat) through friction with the ground and air resistance.

This is a common example of how energy is conserved in everyday situations. The other options in the question involve either energy disappearing or being destroyed, which contradicts the law of conservation of energy.

The last option is also not an accurate representation of how energy is conserved, as the toy car gains speed due to the conversion of potential energy to kinetic energy, not because the ramp creates energy. Thus, option B is correct.

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The pressure of the gas will decrease and the volume of the gas will remain constant as the container filled with gas is rigid.

Gay-Lussac's law states that when the volume of any gas remains constant, the pressure of a gas is directly proportional to its absolute temperature.

The mathematical equation of Gay Lussca's law can be represented as follows:

P/T = k

It is noted that the pressure of the gas is directly proportional to the temperature of the gas.

P ∝ T                  (when V volume of gas is constant)

As the container is rigid so on placing it into ice will not change its volume. But the temperature of the gas will decrease due to ice. So the pressure of the gas will also decrease as the pressure of the gas is directly proportional to temperature but the volume of gas remains constant.

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The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties. The elements are arranged in rows and columns according to their atomic number, which is the number of protons in the nucleus of an atom of that element. There are currently 118 known elements in the periodic table.

The elements in the periodic table are divided into several groups and periods. The groups, also known as families, are vertical columns on the periodic table and are labeled with numbers from 1 to 18. These groups have similar chemical properties and reactivity. For example, the elements in group 1, the alkali metals, are highly reactive and have a single valence electron. The elements in group 17, the halogens, are also highly reactive and have seven valence electrons.

The periods, or rows, on the periodic table are horizontal and are labeled with numbers from 1 to 7. These periods have elements that have a similar number of electron shells. For example, the first period has only two elements, hydrogen and helium, which have one electron shell. The second period has eight elements, lithium to neon, which have two electron shells.

The first element in the periodic table is hydrogen, which has the atomic number 1. It has only one proton in its nucleus and one electron in its outermost shell. The next element is helium, which has the atomic number 2. It has two protons in its nucleus and two electrons in its outermost shell. The rest of the elements are arranged in the table according to their atomic number, with the lightest elements at the top left of the table and the heaviest elements at the bottom right.

There are several notable elements in the periodic table, such as carbon, which is the basis of all living organisms; oxygen, which is essential for breathing; and iron, which is a crucial component of hemoglobin and is vital for the transport of oxygen in the blood. Other elements like sulfur, phosphorus, and chlorine are also important for life and have a wide range of uses in industry and medicine.

In summary, The periodic table is a useful tool for organizing and understanding the chemical elements, which are arranged in rows and columns according to their atomic number, electron configurations, and chemical properties. There are currently 118 known elements in the periodic table, each with its unique properties and uses.

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Answer:

The answers are B and D.

Explanation:

This is because neutralisation process that contain sodium, potassium and ammonium will produce salt and water.

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Answer:

2-Methyl-5-nitrothiophene  

Explanation:

The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.

Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.

A. The empirical formula of the compound is C₃H₈O

B. The molecular formula of the compound is C₃H₈O

Divide by their molar mass

C = 14.99 / 12 = 1.249

H = 3.355 / 1 = 3.355

O = 6.656 / 16 = 0.416

Divide by the smallest

C = 1.249 / 0.416 = 3

H = 3.355 / 0.416 = 8

O = 0.416 / 0.416 = 1

Thus, the empirical formula of the compound is C₃H₈O

Molecular formula = empirical × n = molar mass

[C₃H₈O]ₙ = 60.094

[(3×12) + (8×1) + 16]ₙ = 60.094

60n = 60.094

Divide both side by 60

n = 60.094 / 60

n = 1

Molecular formula = [C₃H₈O]ₙ

Molecular formula = [C₃H₈O]₁

Molecular formula = C₃H₈O

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Yes, oxalic acid is effective in inhibiting the catalytic effect of metal ions.

Catalytic degradation of ascorbic acid occurs through the metal ion catalysis process.

The degradative process generates the free radicals and other reactive species by the catalytic action of metal ions in the system. Therefore, in the presence of transition metal ions, the rate of the catalytic degradation of ascorbic acid increases.

Oxalic acid inhibits this catalytic effect of metal ions.The catalytic effect of metal ions increases the rate of oxidation of ascorbic acid. When ascorbic acid reacts with these metal ions, it forms complexes that participate in the catalytic reaction, and this catalytic reaction increases the rate of the oxidation of ascorbic acid.

The result of the reaction is the conversion of ascorbic acid to dehydroascorbic acid. Therefore, in the presence of metal ions such as copper, iron, and cobalt, the catalytic degradation of ascorbic acid occurs faster than it would occur in their absence.

In conclusion, oxalic acid is effective in inhibiting the catalytic effect of metal ions.

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Answer:

cold front, cold front, warm front, cold front, warm front, also low, low, high, low, high air presure

Explanation:

It causes freezing point depression which requires the gasoline to reach a much lower temperature before freezing. Hence, option C is correct.

Whenever a solute is added to a solution/solvent, it leads to depression in the freezing point of that solution/solvent. Depression in the freezing point of a solution on the addition of a solute is a colligative property.

A colligative property is a physical property which depends upon the number of solutes added not on the nature of solutes which means it does not matter whether we are adding 1000 particles of sugar or salt in water, the depression in the freezing point will occur by the same °C. Also, the more a solute is added the more will be the depression at the freezing point.

The formula for depression at the freezing point is mentioned as under:

             Δ T = K x m

where Δ T = freezing point depression;

                 K = cryoscopic constant;

                 m = molality of the solution.

For example, The freezing point of water is 0 °C but as soon as we add a 92 gm solute like NaCl (common salt) in 1000 gm of water, its freezing point will be lower to −3.72 °C.

Hence, option C is correct.

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The major products formed when benzene reacts with the following reagents are :

(a) tert-butylbenzene

(b) bromobenzene

(c) mixture (ortho-nitrobenzene, meta-nitrobenzene, para-nitrobenzene)

(d) benzaldehyde

(e) nitrobenzene

(a) The major product formed when benzene reacts with tert-butyl bromide and \(AlCl_3\) is tert-butylbenzene.

(b) The major product formed when benzene reacts with bromine and a nail (iron) is bromobenzene.

(c) The major product formed when benzene reacts with iodine and \(HNO_3\) is a mixture of ortho-nitrobenzene, meta-nitrobenzene, and para-nitrobenzene.

(d) The major product formed when benzene reacts with carbon monoxide, HCl, and \(AlCl_3\)/CuCl is benzaldehyde.

(e) The major product formed when benzene reacts with nitric acid and sulfuric acid is nitrobenzene.

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It's clear that the strongest intermolecular forces holding CF2Cl2 molecules together are Dipole-dipole interactions(DDI).

The strongest intermolecular forces(F) holding CF2Cl2 molecules together are DDI. Intermolecular forces are the forces that bind molecules to one another, and these forces have a significant impact on the physical properties of compounds. Dipole-dipole interactions occur when two polar molecules come into contact with one another. The direction of the molecule's dipole moment(u) determines the orientation of dipole-dipole forces. Dipole-dipole interactions are most significant in substances composed of polar molecules, such as CF2Cl2. These forces arise as a result of the partial negative charge on one molecule interacting with the partial positive charge on another molecule.

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Answer:

Exothermic

Explanation:

Exothermic reactions RELEASE heat as a product.

If you were to see "heat" or "energy" above the reaction arrow, then it would be endothermic.

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth