george determines the mass of his evaporating dish to be 7.548 g. he adds a solid sample to the evaporating dish, and the mass of them combined is 23.766 g. what must be the mass of his solid sample? express your response to three digits after the decimal.

To learn the mole concept and standard temperature.

What is standard temperature?

Therefore, 0 degrees Celsius, which translates to 32 degrees Fahrenheit or 273.15 degrees Kelvin, is considered the standard temperature. This is essentially the temperature at which pure water at sea level will freeze when exposed to air at standard pressure.

What is mole?

A mole is a crucial unit of measurement used by chemists. Similar to how having a dozen eggs means you have twelve eggs, having a mole of something indicates that you have 602,214,076,000,000,000,000,000 of that particular thing. Chemists must measure very small objects, such as atoms, molecules, or other particles, using moles.

Therefore there are 0.125 moles of water vapor present.

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From the idea of the Bohr model, each of the electrons would emit a characteristic  wavelength thus four wave lengths are emitted.

We know from the Bohr model that when an electron jumps from a higher to a lower energy level, there is the emission of light of the appropriate wavelength.

Now we know that the energy that is evolved is what determines the wavelength of the light since the wavelength is inversely proportional to the energy that is evolved by the electronic transition.

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Therefore, for the conversion, we want the molarity of the solute as well as the density of the solution.

The molecule is the thing that needs to dissolve, and the solution is the thing that needs to dissolve it. With a wide variety of solutes and solvents, solutions can be created. We are aware of a wide range of solutions.

A solute is a material that dissolves in a solution. The solvent concentration present in fluid solutions is higher than the quantity of content. The two most common examples of solutions in daily life are salt and water.

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The orbital period is proportional to r^(3/2) and does not depend on the satellite's mass. Any object at Jupiter's position will have the same orbital period regardless of mass. The correct answer is 11.9 yr. Option C.

As the Earth rotates on its axis creating day and night, it travels around the Sun in an elliptical orbit taking about 365 1/4 days to complete. The Earth's rotation axis is tilted with respect to the orbital plane. This creates seasons. The elliptical nature of the Earth's orbit is due to the first forces pushing the Earth away from the Sun's disk.

The momentum of this throw being greater the Earth's orbit would have been more elliptical or it might have been completely ejected from the solar system forever. The Earth's orbit defines a two-dimensional plane called the Ecliptic. It takes about 365 days for the earth to revolve around the sun. After years of analysis, Kepler found that Mars' orbit was likely elliptical, with the Sun at one of his focal points of the ellipse. This led Kepler to discover that all planets orbit the Sun in elliptical orbits and that the Sun is at one of his two focal points.

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Answer:

The sun

Explanation:

The sun is much heavier, it also pulls all eight planets towards its center and keeps them in their orbits.

Hope this helps

Answer:

The sun, because it is the largest one, and has the greatest gravitational pull. It keeps the earth in orbit around it.

Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH;  hence, increasing volume will increase the pH.

Higher is the concentration of H plus ions, more acidic is the solution and  lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.

When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.

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The major organic product isolated from the reaction of 3-hexyne with ozone followed by hydrolysis is Propanoic acid by the ozonolysis

Ozonolysis is a method of  cleaving alkenes by oxidation reaction  or alkynes using ozone (O3), which is reactive allotrope of oxygen. The process allows for carbon-carbon double or triple bonds to be replaced by double bonds with oxygen.

This reaction is often used to identify the structure of unknown alkenes by breaking them down into smaller and more easily identifiable pieces. Ozonolysis also does occurs naturally and would break down repeated units which are used in rubber and other polymers.

The major organic product isolated from the reaction of 3-hexyne with ozone followed by hydrolysis is Propanoic acid.

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Vitamins are an important nutrient that the body needs to grow, develop, and carry out its functions normally. These nutrients are classified as macronutrients or micronutrients, which means the body needs them in small amounts. Generally, vitamins come from organic foods and fruits.

Not all vitamins can be produced by the body, so humans still need vitamins as additional nutrition. Vitamins and minerals are nutrients that fall into the category of micronutrients. The body requires levels of vitamins and minerals in small amounts.

Some types of vitamins that are known are:

Vitamins A, C, D, E, K,

B vitamins, including thiamin (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxal (B6), cobalamin (B12) , biotin, and folic acid/folate.

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The chemical formula of bleaching powder is Ca(ClO)₂.

Bleaching powder is a commercial product used for sanitation purposes. They are mainly used to disinfect drinking water and sanitize pools.

Chemically, this product is referred to as calcium hypochlorite. The formula of calcium hypochlorite is  Ca(ClO)₂.

This compound is a white solid that has a strong smell of chlorine. This compound is produced by the reaction between chlorine (Cl) gas and slaked lime ((Ca(OH)₂).

This reaction equation is given as:

[tex]\mathrm{2Cl_2 + 2Ca(OH)_2} \rightarrow \mathrm{Ca(OCl)_2 + CaCl_2 + 2H_2O}[/tex]

Besides calcium hypochlorite, bleach also contains calcium hydroxide and calcium chloride. But calcium hypochlorite is more so the formula.

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180 mL of hydrochloric acid needs to be mixed with 1500 milliliters of water to make a solution that is 12% acid.

What is a mixture?
A mixture is a substance made up of two or more chemical compounds with different properties that are not chemically connected. The physical combination of two or more substances results in solutions, suspensions, or colloids, which retain the separate identity of the individual constituents.

The amount of hydro chlorocalcite will be calculated as below:- 1500x12

Hence, 180 mL of hydrochloric acid needs to be mixed with 1500 milliliters of water to make a solution that is 12% acid.

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The pH of a solution prepared by diluting 15.00 ml of 0.10 m HCl with enough water to produce a total volume of 100.00 ml will be 1.823

What is Molarity (M)?

The amount of a substance in a specific volume of solution is known as its molarity (M). It is also defined as the number of moles of a solute per liter of a solution. The molar concentration of a solution is another name for molarity.

It can be expressed as:

M = \frac{n}{v}

where, M = molar concentration

n = moles of solute

v = liters of solution

Given values: total volume = 100.00 ml, given volume = 15.00 ml

Solution: Molarity of acid after dilution = \frac{15 × 0.10}{100} = 0.015M

As one molecule of HCL release one H+ ion, Molarity of H+ ions will be 0.015 M

So, pH = - log (0.015) = 1.823

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Monomers of condensation polymers must contain two functional groups so that each monomer can link with two other monomers

What are condensation polymers?

whar ar esters?

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To make 300 ml of Ammonium sulfate solution 158.5 grams of Ammonium sulfate should be taken.

Given,

Molarity of Ammonium sulfate = 4 M

Volume of solution = 300 mL = 0.3 L

Molar mass of Ammonium sulfate = 132.14 g/mol

Mass = Molarity × Molar mass × Volume of solution in Litres

Substituting the values we get,

Mass of the (NH₄)₂SO₄ = 4 M × 132.14 g/mol × 0.3 L

                                      = 158.5 g

Hence, the mass of Ammonium sulfate required to make 300 ml of Ammonium sulfate solution is 158.5 grams.

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The electronic configuration of the elements of the second group of the second period is 1s²2s²2 1s2 2p6 3s2 3p64s² or 2,8,8,2

To determine the external electronic configuration of an element, knowing the number is needed. Electrons and usage configuration rules (or electron energy levels).

The number of electrons in a neutral atom is the same as the number of protons.

The number of protons is the atomic number of the element. The

elements are arranged in the periodic table according to their atomic number.

The elements of group 2 are calcium and magnesium

The atomic number, number of protons, and number of electrons of group 2 elements are 40

Now we can distribute the electrons according to the structural rules:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

The outer shell has n = 2, so the outer electron configuration is 4s²

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The statement atoms in the original substances are arranged in a different way to make new substances correctly describes a change that occurs during a chemical reaction (Option A).

A chemical reaction is a process in which atoms arrange in different ways to form a new substance known as the product of the reaction while initial molecules are the reactants.

Therefore, with this data, we can see that a chemical reaction starts with certain molecules called reactants that have a arrangement while this process ends with molecules which are known as products of such reactions.

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NO2 is the formula of the compound that reacts with water to form HNO3.

What is a chemical compound?

A chemical compound is a substance made up of several similar molecules (or molecular entities) that contain atoms from more than one chemical element and are bound together by chemical bonds. A molecule made up of only one element's atoms is hence not a compound. A chemical reaction can change a compound into a distinct substance, which may entail interactions with other chemicals. Bonds between atoms may be disrupted and/or new bonds generated during this process. Compounds are classified into four categories based on how the constituent atoms are linked together. Covalent bonds hold together molecules; ionic bonds hold together ions; metallic bonds hold together intermetallic compounds; and coordinate covalent bonds hold together coordination complexes.

NO2 is the formula of the compound that reacts with water to form HNO3.

Nitrous dioxide reacts with water to form nitric acid.

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The volume and shape of a nanoparticle determines how it interacts with light. This determines the color of a nanoparticle solution.

The coloration depends on the size and form of the nanoparticles, in addition to the distance between them. Right here, the red nano gold particles are approximately 20 nanometers across, whilst the orange nano gold particles are about 80 nanometers across.

Nanoparticles appear positive colors because they mirror (scatter) and take in unique wavelengths of visible light. Light which seems white is a more or less same combination of the wavelengths of light that can be perceived by means of the human eye, more or less four 100 to 750 nm.

As particle length increases, the wavelength of surface plasmon resonance associated absorption shifts to longer, redder wavelengths. red light is then absorbed, and blue light is pondered, yielding answers with a faded blue or red color.

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In Ionic Bond metals lose valence electrons and become positively charged cations, non metals accepts valence electrons and become negatively charged anions .

Ionic bonds are formed in vicinity of atoms like for example NaCl , KCl , CaCl₂.

Ionic bonding is the complete transfer of valence electrons between atoms. Ionic compounds obey octet rule and become more stable and so they are typically neutral.

Ionic Bonds, metals lose valence electrons and become Positively charged cation .

Non metals accepts electrons and becomes negatively charged anion.

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when vinegar combines with the calcium carbonate, the acetic acid and the calcium carbonate come apart and reform in different ways to make new chemicals. One of them is the gas carbon dioxide.

The molar mass of CaCO3 is 100.0 g/mole so you need 727300g or 727.3 kg of limestone. Calcite or aragonite are the most common forms of limestone, a sedimentary rock mostly made of calcium carbonate (CaCO3). It could have a significant magnesium carbonate content (dolomite).

Lime, the base calcium oxide, is left behind after heating the limestone (calcium carbonate). The original limestone will be replaced with white lime that is more crumbly in texture. Water and calcium carbonate do not react.

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The right option is C, the correct noble gas notations for Li is [He] 2s¹.

We know that the atomic number of Li is 3 , so it will have 3 electrons in total, in filling electrons the electronic configuration is came as follows:

1s²2s¹ , but we asked for noble gas electronic configuration , so in this type of way of writing a noble gas configuration , we write by using the most nearer electronic configuration of a noble gas.

Let us see each option in each case,

So the correct notation will be [He]2s¹ which is option C.

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Answer:

I'm pretty sure its 2.73 g

Explanation:

Magnesium oxide is not composed of [tex]Mg^{+}[/tex] and [tex]O^{-}[/tex] ions because of the balanced chemical reaction.

A reaction is said to be balanced chemical reaction when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. For example in the chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.

In the above given case when we write the balanced chemical reaction for the formation of Magnesium oxide it is as follows;

 2Mg + [tex]O_{2}[/tex] ⇄ 2MgO

From this reaction we can clearly see that 2 molecules of magnesium is reacting with one molecule of oxygen. So each magnesium will loose one electron to bond with oxygen so since there are 2 magnesium atoms the total charge on the ion would be [tex]Mn^{2+}[/tex] and similarly in case of oxygen it would be [tex]O^{2-}[/tex]

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the phase of the copper product after the reaction in the copper cycle is listed below

1.the heating of Cu(OH)2 to form CuO i.e

Cu(OH)2 (s) ⇒ CuO(s) + H2O (l) which means the product of copper is in a solid phase after the reaction.

2.the addition of NaOH to Cu(NO3)2 to form Cu(OH)2 i.e

Cu(NO3)2 (aq) + NaOH (aq) ⇒Cu(OH)2 (s) + 2NaNO3 (aq) which means the product of copper is in the solid phase after the reaction.

3. the addition of HCL to CuO to form CuCl2 i.e

2 CuO(s) + 2 HCl(aq)  ⇒ 2 CuCl2(aq) + H2O (aq) which means the product of copper is in the aqueous/liquid phase after the reaction.

4. the addition of Al to CuCl2 to form Cu i.e

Al(s) + CuCl2(aq) ⇒ AlCl3(aq) + Cu(s) which means the product of copper is in a solid phase after the reaction.

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Competing reactions:

Desired - RX + Mg ⇒ RMgX rate ~ [RX]

Side - RX + RMgX ⇒  R-R + MgX2 rate ~ [RX]²

The desired reaction is favored by keeping the [RX] low so that it reacts with Mg and not RMgVia the Schlenk equilibrium Grignard reagents form varying amounts of organomagnesium compounds. Alkyl halides react with magnesium metal in anhydrous ether solvents to form organometallic reagents.

Grignard reagents are formed by the reaction of magnesium metal with alkyl or alkyl halides. They are wonderful nucleophiles that react with electrophiles such as carbonyl compounds and epoxides. Since Grignard reagents are strongly basic, they often undergo elimination reactions or do not react at all. The transition state of the alkyl halide substitution is less stable than the magnesium bromide complex. This is due to ligation formation between the solvent and magnesium atoms.

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Answer: 91.5 kJ

Explanation:

Using an acetic acid\sodium acetate buffer solution, ratio of acid to conjugate base that will be needed to maintain the pH at 5.00 is 1:1.

For having, effective buffer, the number of moles of the weak acid and its conjugate base must be large as compared to the number of moles of strong acid /base that is added. The best buffering occur when the ratio of [HA] to [A-] is 1:1.

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Rutherfordium is the longest element name on the periodic table.

What is Rutherfordium?

Rutherfordium is a chemical element with the symbol Rf and atomic number 104, named after the British physicist Ernest Rutherford, who was born in New Zealand. It is not present in nature as a synthetic element and can only be created in a laboratory. It is radioactive; the half-life of the most stable known isotope, 267Rf, is 1.3 hours. It is a d-block element and the second of the fourth-row transition elements in the periodic table. It is a group 4 element in period 7. Experiments in chemistry have proven that rutherfordium is the heavier homolog to hafnium in group 4. Rutherfordium's chemical properties are only partially known.

Rutherfordium is the longest element name on the periodic table with 13 alphabets in its name.

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The density of the gas will decrease as we heat the gas.

Density of a system is defined by mass per unit volume. Density basically describes how compact or concentrated something is. For example, suppose you have two boxes, one is large and one is small. However, they both weigh the same. But we see that  the small box has a higher density than the large box. So, density also tells how concentrated or crowded something is.

Considering the above given case, when  we take a gas sample in a balloon and then when we start to heat this sample, due to hear we can see that the gas molecules will try to move more far from each other and therefor the density of the system will decrease. This same concept is been used in hot air balloons too. When we heat the balloon the density of the gas will decrease and therefor the balloon floats in the air.

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Answer:

NO: +2
NO2: 3
N2O3: +3
N2O4: 4
N2O5: 5

Explanation:

Answer: The goals of Reconstruction were to reincorporate the South into the Union, to establish equality under law for African Americans, and to assist African Americans in the transition from slavery to freedom.

Explanation: The Reconstruction was the period that followed the Civil War and during which the southern states that had adhered to the defeated Confederation were reintegrated into the Union. The devastating southern unionist invasion, attacks on civilian targets and the destruction of infrastructure, together with the economic policy that was implemented in the territory of the defeated after the war, caused the rise of a bitter rancor of many Southerners against the federal government. :D Hope I helped!