i need famous invention from the last 200 years

Answer:

A mixture of an element and a compound made of elements are two different types of combinations of matter.

An element is a substance that cannot be broken down into simpler substances by chemical means. Atoms are the smallest units of elements that still retain their properties. For example, gold is an element with the symbol Au, and its atoms cannot be broken down into simpler substances without losing their properties.

A compound, on the other hand, is a substance made up of two or more different elements chemically combined in a fixed ratio. For example, water is a compound made up of two hydrogen atoms and one oxygen atom, with the chemical formula H2O.

A mixture of an element and a compound is a combination of two or more substances that are physically mixed together, but not chemically combined. The substances in the mixture retain their individual properties and can be separated by physical means, such as filtering or evaporation. For example, a mixture of salt (a compound) and iron filings (an element) can be physically separated by using a magnet to attract the iron filings, leaving the salt behind.

In summary, the difference between a mixture of an element and a compound made of elements is that the former is a physical combination of two or more substances that retain their individual properties, while the latter is a chemical combination of two or more elements in a fixed ratio that results in a new substance with its own distinct properties.

Answer:

DNA it looks like a long spiraling ladder

Explanation:

was it just the first question, or do you need the 2nd on too?

The vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.

This can be calculated using Raoult's law. The law states that the vapor pressure of a solution is inversely proportional to the mole fraction of the solvent (not the solute).

The following formula can be used to get the vapor pressure of a solution of 1.48 m Al(NO₃)₃ at 45.0 °C:

P = P° × Xsolvent

where P is the vapor pressure of the solution, Xsolvent is the solvent's molecular weight, and P° is the solvent's pure vapor pressure.

The solvent's mole fraction is equal to 1 because it is presumed that the solute has entirely broken down. In this instance, the solution's vapor pressure is the same as the pure solvent's, which is 71.93 torr at 45.0 °C.

Hence, the vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.

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Alpha particles are substantially larger and heavier than beta particles or gamma rays, which is why engineers chose a fuel that produces alpha particles as opposed to beta particles or gamma rays.

RTGs can be used in space missions when size, weight, and dependability are important considerations, although fusion and fission reactors are far larger and more sophisticated than RTGs.

It is simpler to build an effective energy conversion system since alpha decay is a highly predictable process that generates a consistent supply of energy.

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Answer:

has

Explanation:

has

Answer:

has

Explanation:

True, the rule "like dissolves like" explains why liquids are generally soluble in other liquids.

The rule "like dissolves like" is a fundamental principle in solubility, stating that substances with similar polarities or intermolecular forces tend to dissolve in each other. This rule is based on the concept that substances with similar chemical properties are more likely to mix together and form a homogeneous solution. When two liquids have similar intermolecular forces or polarities, their molecules are attracted to each other and can interact on a molecular level, resulting in solubility. For example, polar solvents like water can dissolve polar solutes like salt or sugar because the polar nature of water allows it to interact with the charged particles of the solute.

Nonpolar solvents, on the other hand, can dissolve nonpolar solutes like oil or grease due to their similar nonpolar characteristics. The rule "like dissolves like" provides a useful guideline for predicting solubility behavior and understanding the interactions between different substances in solution.

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Answer:

Isotopes

Explanation:

Isotopes are atoms of the same element that contain an identical number of protons, but a different number of neutrons. Despite having different numbers of neutrons, isotopes of the same element have very similar physical properties.

Answer:

natural income

Explanation:

Living sustainably in the 21st century means coexisting with the nature. In other words, to live sustainably means to meet the needs of the human without affecting or degrading the mother nature.

In the context, living sustainably means to live from the natural income from the nature's gift to us, using their natural resources and not hurting them or exploiting them. They may be resources from the soil, plants, clean air, animals, nature's clean water,etc.

Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays.

Explanation:

If he begins with 8.5 g of aluminum,62.1 gram of zinc chloride will he measure out for a complete reaction.

The balanced equation of reaction is defined as the total mass of reactant is equal to the total mass of product.

The balanced equation of reaction is as follows:

2Al + 3ZnCl₂ → 2AlCl₃ +3Zn

Now we must use stoichiometry to convert grams of Al to grams of ZnCl₂

The molar mass of aluminum is 27.99 g/mol

The molar mass of zinc chloride is 136.29g/mol

Zn = 65.39

Cl₂ = (35.45) = 70.9065.

= 39+70.90

= 136.329

The mole ratio of ZnCl₂ to Al is 3:2

= 8.5 × 3 × 136.329 / 27.99 × 2

= 62.1 gram

Thus, 62.1 gram of zinc chloride will he measure out for a complete reaction.

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The postulate of kinetic molecular theory is that the kinetic energy of gas molecules depends on temperature. Therefore, the correct answer is: "The kinetic energy of gas molecules depends on temperature." The correct option is D.

The kinetic energy of gas molecules depends on temperature. This is the postulate of  kinetic molecular theory. so, this is the correct choice. The other answer choices are not postulates of kinetic molecular theory. For example, "Molecules of gases have a finite volume" is not a postulate, but rather a property of gases described by the theory.

Similarly, "Molecules of gases attract and repel one another" is not a postulate, but rather a statement about the intermolecular forces between gas molecules. Finally, "Collisions between gas molecules are inelastic" is not a postulate, but rather a statement about the behavior of gas molecules during collisions.

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Answer:

1.  7.86 × 10⁴ g

2.  7.86 × 10⁴ kg

3.  1.989 × 10¹³ mg

4.  1.989 × 10²⁸ kg

5.  1.989 × 10³³ g

Explanation:

The easiest way to make sure you have the right answer is to convert all units to the same unit.

A.  1.989 × 10¹³ mg = 1.989 × 10¹⁰ g

B.  7.86 × 10⁴ g

C.  1.989 × 10³³ g

D.  7.86 × 10⁴ kg = 7.86 × 10⁷ g

E.  1.989 × 10²⁸ kg = 1.989 × 10³¹

The correct order is B < D < A < E < C

An amino acid is considered "limiting" if it is absent from food in sufficient quantities to meet a person's needs. Option c is the correct option.

What is an amino acid?

Organic substances known as amino acids have both amino and carboxylic acid functional groups. Alpha-amino acids, which make up proteins, are by far the most significant of the hundreds of amino acids found in nature. In the genetic code, only 22 alpha amino acids are present.

The building blocks of proteins and amino acids are essential for the structure and operation of all living cells. The body cannot synthesize essential amino acids, so they must be consumed through diet. An amino acid is considered "limiting" if it is absent from food in sufficient quantities to meet a person's needs. If a protein lacks enough of one or more essential amino acids, it is said to be "limiting". This indicates that the protein cannot be utilized effectively by the body and, if consumed in large amounts, may result in deficiencies. Taking essential amino acid supplements can help to make up for these deficiencies and enhance general health.

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Answer:

Agree

Explanation:

Answer:

Agree

Explanation:

A conjugate acid-base pair is the pair of two compounds which differ by the presence of a proton. An acid will donate protons to a base and become a conjugate base. A base will accept protons and become a conjugate acid.Conjugate acid/base pairs are as follows:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−Explanation:

H2PO4− and HPO42−H2PO4− can donate a proton to become HPO42− and the latter can accept a proton to become H2PO4−.H2CO3 and CO32−H2CO3 can donate a proton to become CO32− and the latter can accept a proton to become H2CO3.HCl and Cl−HCl can donate a proton to become Cl− and the latter can accept a proton to become HCl.H3O+ and OH−H3O+ can donate a proton to become OH− and the latter can accept a proton to become H3O+.Therefore, the following are conjugate acid/base pairs:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−

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The intermolecular forces are in the solid NaCl salt is ion - ion forces or the dipole - dipole forces of the interaction.

The Na is the metal and is capable of the donating the electrons and the Cl is the non metal and have capability of accepting the electrons. This makes the Na to form the cation and the Cl to make the anion. The dipole - dipole forces are present in the molecule which contains the oppositely charged ions one is positively charged ion and the other is the negatively charged ion.

Thus , the NaCl solid has the ion - ion intermolecular forces of the interaction .

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Answer:

standard pressure is equal to 1 atm.

Explanation:

The correct answer is a) Backstage. It is the behavior one engages in when no one else is present, when they are free from the rules and norms of interaction governing day-to-day interactions.

In the context of social interactions, the concept of frontstage and backstage was introduced by sociologist Erving Goffman. Frontstage refers to the social setting where individuals perform their roles and engage in interactions with others in accordance with the norms and expectations of society. It is the public realm where individuals are conscious of their behavior and present a certain image to others. On the other hand, backstage refers to the private setting where individuals are free from the gaze of others and the expectations of social performance. It is the space where individuals can relax, be themselves, and engage in behaviors that may not be appropriate or conform to societal norms in the frontstage.

Therefore, when no one else is present and individuals are free from the rules and norms of interaction, they engage in backstage behavior. This includes actions, expressions, and behaviors that are typically hidden from public view and may be more informal, unguarded, or even deviant compared to frontstage behavior. It provides individuals with a sense of privacy and a space to express themselves without the need to adhere to societal expectations. Hence the correct answer is a) Backstage

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Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum a wire runs between the strips then Sn in the cell undergoes oxidation

Galvanic cell is the electrochemical cell that convert the chemical energy into electrical energy

Here given data is

beaker of sulfuric acid and a beaker of nitric acid the sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum. a wire runs between the strips then the reaction is

Sn(s) + 2NO₃⁻(aq) + 8H⁺(aq) → 3Sn²⁺(aq) + 2NO(g) + 4H₂O(l)

So in this reaction the Sn oxidizes to Sn²⁺ and the number of oxidation increases from 0 to +2 by removing the 2 electron that's is called oxidation process

Sn → Sn²⁺ + 2e

Oxidation is the process removal of electron

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Answer:

b nitrogen&oxygen

Explanation:

i'm built different

Answer: (F) chemical energy

Explanation:

The answer is dipole-dipole and dipole-induced dipole forces.

The dipole-induced dipole is a kind of interaction induced by a polar molecule by disturbing the arrangement of electrons.

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Solids, liquids, and gases differ in terms of packaging of the atoms in its constituent atomic level.

Solids, liquids, and gases are the three main states of matter. They differ in the way their atoms or molecules are arranged and how they interact with one another. Solids have a definite shape and a definite volume. The atoms or molecules in a solid are tightly packed together and are not free to move around. Solids also have a low compressibility and a high density. Liquids have a definite volume but no definite shape. They take the shape of their container. The atoms or molecules in a liquid are close together but are free to move around. Liquids have a low compressibility and a lower density than solids. Gases have no definite shape or volume. They expand to fill their container. The atoms or molecules in a gas are widely spaced and are free to move around. Gases have a high compressibility and a low density. Examples of gases include air, oxygen, and natural gas. In summary, Solids have a fixed shape and volume, liquids take the shape of their container, have a definite volume and gases have no fixed shape or volume and expand to fill their container.

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Answer:

it is mixture have a great day

In the mass spectrum of pentane, the presence of a peak with an m/z = 29 most likely is due to the loss of butyl radical from the molecule.

A spectrum (spectra or spectra) is a state that is not confined to a particular set of values ​​and can vary seamlessly on a continuum. The term was first used scientifically in optics to describe the rainbow colors of visible light after passing through a prism.

The Spectrum of Life in the Hall of Biodiversity is an evolutionary journey through the incredible diversity of life on Earth. The 1,500 specimens represent a wide range of bacteria, fungi, plants and animals, from the smallest microbes to giants of land and water. A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or parts thereof) emitted or absorbed by an object or substance, atoms or molecules. Examples of spectra include the rainbow, the colors of the sun's emission, and infrared absorption wavelengths of molecules.

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