You have 132. 4 mL of a 2. 50 M solution of Na2CrO4(aq). You also have 125 mL of a 2. 50 M solution of AgNO3(aq). Calculate the concentration of Na after the two solutions are mixed together

The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength

When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen

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When a sealed balloon containing Helium is squashed so its volume decreases, and no helium enters or leaves the balloon the density of the Helium in the balloon increases.

Note that the expression or equation for density is:

Density = Mass/ Volume

But we know that the mass of the Helium Atom is Constant.

Lets assume that is is 1,

Hence,

Density = 1/V

Hence, if V reduces, D increases creating an inverse relationship.

Note that the term density refers to how much space an item or substance occupies (its volume) in proportion to the amount of matter in that thing or substance (its mass). Density may also be defined as the quantity of mass per unit of volume.

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Answer:

the answer would be 7.584*10^23

8.7M  Is the solubility of Ca(oh)2  in water at a given Ksp of 6.5 .10-6  and molar mass of   74.09g/mol.

Solubility is defined as the amount of the substance  dissolved in a given amount of solvent at a certain temperature.

Ca(OH)2   à  Ca2+  +  2OH-

Ksp = 6.5 .10-6

Molar mass= 74.09 g/mol

Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.

          Ksp=[Ca2+] [OH2-]

      6.5 .10-6 = S. (74.09g/mol +S)

      6.5 .10-6 = S .( 74.09M)

        S = 6.5 .10-6 /74.09 M

            =  8.7 M

       So, the solubility of Ca(OH)2  is  8.7M.

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The half life of the radioactive isotope is 25 million years.

The half life of the substance - The half life of the substance is the time taken by the substance to decay to its half concentration of the initial value.

All the radioactive reaction follows first order kinetics,

So, it means that,

If in 200 million years, only 1/16 of the original amount of the radio active atoms in a sample.

It means before 100 million years, the amount of the radioactive atoms were 1/8.

similarly, 50 million years, the amount of the radio active atoms were 1/4.

Continuing the pattern, 25 million years, the amount of the radio active atoms were 1/2.

So, after 25 million years, the amount of radioactive atoms in the sample left are 1/2 of the original amount.

So, the half life of the sample is 25 million years.

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The object will have the smallest change in motion when an equal force is applied is 8kg circle.

A force is described as an influence that can change the motion of an object.

A force can cause an object with mass to change its velocity or to change its acceleration. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.

The object will have the smallest change in motion when an equal force is applied is 8kg circle because according to Newton's second law which states that the rate of change of momentum of an object is directly proportional to the net force acting on it, provided that the mass of the body is kept constant.

This means that  as mass increases, force will increase. However, if acceleration is negative, then force will just increase by the same amount in the opposite direction.

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Sodium acetate will form the basic salt when dissolved in water.

Water turns basic when a salt made from a strong base and a weak acid dissolves in it. Sodium ions and acetate ions are created when sodium acetate dissociates in water. There are no acidic or basic characteristics in the sodium ion. The conjugate base of acetic acid, the acetate ion, has a high affinity for H+ ions.

The solution turns acidic when a salt made from a potent acid and a feeble base dissolves in water. Chloride ions and ammonium ions are created when ammonium chloride dissociates. No affinity exists between the chloride ion and H+ ions.

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The double or triple bond are needed because as they serves as a source of electron density and serves as a nucleophile.

The double bond or triple bond are electron rich entities capable of donating electrons thus act as nucleophile (species that donate electrons) and serve as electron dense region in molecules.

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If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.

Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.

To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.

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Minerals are similar as they always have a specific chemical structure throughout the entire mineral and are all solids at normal temperatures while they can be different due to their physical properties.

Minerals are naturally occurring solid substances. They can be made from a single element (like gold) or from a combination of elements (Sodium and Chlorine). The Earth is made up of thousands of different minerals.

Minerals are often divided into two groups: silicates and non-silicates. Silicates are minerals that contain silicon and oxygen.

The rest of the minerals are classified into a group called non-silicates.

Some important non-silicate minerals include:

In conclusion, minerals are very similar to each other but also differ in their physical properties even if they all exist in the form of crystals.

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Answer: Rusting Photosynthesis

Explanation: Hope this helps

The mechanism and product for the given reaction after adding acid and water in the second step will result in the production of phenylpropanol.

The missing reaction scheme of the question is attached as a picture:

As a result of the reaction between benzaldehyde with diethyl ether (Et2O) and MgBr an intermediate results. This intermediate then reacts with hydronium to produce phenylpropanol. The hydronium ion generates as a reaction between the water molecule and a strong acid. Acid donates its proton to the water molecule. This hydronium ion then donates this proton to the resulting intermediate. The complete mechanism is attached:

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Recrystallization ; 25 mL of solvent are needed at 100 oC to dissolve 100 mg of the chemical. 75 mg of the chemical will precipitate at 0 oC while 25 mg will remain in solution.

The chemical compound para nitroacetanilide, commonly known as 4-nitroacetanilide, is a nitroacetanilide derivative made from acetanilide and a nitrating combination. A trace of ortho product also forms along with the para product.

Through nitration, the chemical molecule p-nitroacetanilide is created from acetanilide. P-nitroacetanilide is created when acetanilide is treated with a nitrating mixture, which is a combination of nitric acid and sulfuric acid. O-nitroacetanilide is also generated as a small byproduct along with p-nitroacetanilide. It is quite simple to separate p-nitroacetanilide through crystallization since o-nitroacetanilide is highly soluble in alcohol.

Because ethanol is endlessly cosoluble with water and has high dissolving properties for many organics, ethanol and water mixtures are frequently utilized. Many organic compounds' solubilities can be drastically and quickly decreased by the addition of water, which can cause crystallization.

The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. Smaller crystals will be produced as a result.

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An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.

In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).

The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.

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Echo: When a sound wave is created in the air, some of it is reflected back to the listener while some of it is absorbed after hitting a reflector. Echo is the name for this reflected sound.

Utilizations for Echo:

1. Bats use the echolocation method to find their way because they are unable to see with their eyes. Bats can determine whether an object is in front of a sound by listening to how it is reflected. It uses this method when hunting its prey.

2. This method is also employed to determine undersea distance and ocean depth.

3. Estimating the separation between hills and mountains is also helpful.

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In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.

Henri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo

In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.

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Answer:

draw conclusions and analyze results

The safety factor describes how much more robust a system is than is necessary for the load that is intended.

The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .

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Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.

Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.

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The mass of silver chloride produced is 24.79g.

Given,

volume = 1.11 L

Molarity = 0.156 M

First, convert molarity to moles by multiplying by the volume:

0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3

We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:

0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl

To get mass from moles, we multiply by the molar mass:

0.173 moles AgCl x (143.32 g/mol) =  24.79 g AgCl

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The main safety hazards of trimethylsilyl chloride (tmscl)  in the lab are,

It could cause severe eye burns.

It is harmful if absorbed through the skin. It could cause severe burns.

It may be harmful if swallowed. Causes severe digestive tract burns.

It may be harmful if inhaled. Causes chemical burns to the respiratory tract.

Prolonged or repeated skin contact may cause dermatitis.

Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.

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The corresponding match for each element is as follows:

Silicon, Arsenic, and Antimony - Metalloids

Can exchange electrons with each other to form ionic compounds _ Metals and non-metals

May have no luster - Metalloids and Non-metals

Tin, Calcium, and Potassium - Metals

Hydrogen, Oxygen, and Chlorine - Non-meatals

Can be electrical conductors - Metals and metalloids

Comprised of atoms - all

The elements can be classified into three;

Each of these classes of elements has its own unique properties. The properties of the three classes of elements include the following:

Metals - metals are hard and mostly solid substances with luster. They are good conductors of heat and electricity. Metals form ionic compounds with non-metals by exchanging their electrons. Examples are calcium, sodium, copper

Metalloids - they are mostly solid substances that are intermediate conductors of heat and electricity. They may have no luster. Examples are Silicon, Arsenic, and Antimony.

Non-metals - non-metals are soft and mostly gaseous substances with no luster. They are poor conductors of heat and electricity. Non-metals form ionic compounds with metals by exchanging their electrons.

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The plants and animal cells are different because:

-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright

-Plant cells have cell walls to provide a stronger external structure and animal cells do not.

-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.

In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.

Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.

Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.

A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.

Although a part of your question is missing, you might be referring to this question:

Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.

Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright

Animal cells contain a nucleus and plant cells do not

Plant cells have cell walls to provide a stronger external structure and animal cells do not.

Plant and animal cells are both completely the same and they have no differences.

Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.

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Answer: thermal

Explanation: I remembered

These protons, neutrons and electrons are the three fundamental particles of atoms

What is atom ?

The atom is the smallest unit of matter that may be divided without releasing electrically charged particles. It is also the lowest unit of matter that has chemical element features. As a result, the atom is the fundamental building block of chemistry.

Examine various electron configurations in electron shells surrounding an atom's nucleus.

The majority of the atom is empty space. The rest of the structure is made up of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. In comparison to electrons, the lightest charged particles in nature, the nucleus is small and dense.

The mass of an electron is approximately 9.109382911 1028 gramme. A proton or neutron has a mass that is approximately 1,836 times greater. This explains why the mass of an atom is governed mostly by the mass of its protons and neutrons in its nucleus.

Mass of protons, m

p =1.67×10 −27 kg

Mass of electrons, m

e =9.11×10 −31 kg

∴ m e

​mp≈1836

The proton to electron mass ratio is represented by μ or β. It is a dimensionless quantity.

μ= m e

​

mp≈1836

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The empirical formula of the compound is CH3O

What is Combustion ?

Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.

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Answer: B

Explanation: Genetics has to do with genes, which is appearance, which is hereditary from the parent :)

Answer:

A:

Newton's First Law of Motion is the law of inertia. It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless acted upon by an unbalanced force.

B:

No, objects do not move by themselves. They require a force to move them.

Explanation:

The balanced chemical equation for the reaction FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl is 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.

What is a balanced chemical equation?

Balanced chemical equation is the equation of a reaction in which both reactant and product sides are equal in the number of atoms or molecules. The total charges on both the sides should be equal.

The given reaction can be made into balanced chemical equation by counting the number of atoms on both the sides. If the atoms of a particular element is less on either sides then multiply the whole molecule by a number which balances the number of atoms on the either sides of the reaction.

Therefore, the balanced chemical equation of FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl can be written as 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.

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C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.

What are hydrocarbons?

The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.

The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.

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