Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.

The primary structure of a protein is the sequence of amino acids that are attached together by peptide bonds.

Amino acids are the building blocks of proteins, and the primary structure of a protein is the sequence of amino acids that are attached together by peptide bonds. Peptide bonds are formed when the carboxyl group of one amino acid reacts with the amino group of another amino acid, and the resulting molecule is called a peptide.

The primary structure of a protein is important for its function, as it determines the three-dimensional structure of the protein. The three-dimensional structure of a protein is vital for its function, as it determines how the protein interacts with other molecules. Proteins are important for many biochemical processes in the body, such as metabolism, cell signaling, and DNA replication.

The primary structure of a protein can be altered by mutations, which are changes in the DNA sequence that encodes the protein. Mutations can be caused by environmental factors, such as UV light or chemicals, or they can be inherited. Inherited mutations are responsible for many genetic disorders, such as sickle cell disease and cystic fibrosis.

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The reagents need for the formation of 2-ethyl heptanoic acid are Bromoethane, 1-bromopentane, sodium ethoxide, and potassium tert-butoxide.

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The mass of a 49.7 cm3 sample of aluminum is 134.29 g.

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H+ (aq) undergone reduction in the reaction to form H2(g).

Cell reaction - ca(s) | ca 2 (aq) || h (aq) | h2(g) | pt

In above reaction we can say that ,

Ca(s) lost two e-(s) and became ca+2(aq), that means it is undergoing oxidation by losing to electrons.

In the above redox reaction, H+(aq) gains two electrons and undergone in the reaction to form H2(g), Thus here reduction takes place or we can say that H+ has undergone reduction.

Reduction occurs in the chemical reaction when addition of hydrogen or removal of oxygen takes place. Gaining of electron in the chemical reaction also referred as reduction.

Oxidation refers to the process when element looses it's electron or adding of oxygen or removal of hydrogen takes place.

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Explanation: Any system within the Earth system is considered an open system. Because energy flows freely into and out of systems, all systems respond to inputs and, as a result, have outputs. For example, water and chemicals, as well as energy enter and leave the boundaries of a watershed system.

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The empirical formula of the magnesium oxide formed is MgO

Here given data is piece of magnesium with a mass = 5.867 g  after the magnesium had combusted and allowed to cool down the product and mass = 8.956 g

The empirical formula is the simplest whole number ratio of atoms in a compound and the ratio of atoms is the same as the ratio of moles and when crucible react with magnesium and air means oxygen then magnesium reacts readily with oxygen in the air, to produce magnesium oxide then chemical reaction is written as follows:

2Mg + O₂ → 2MgO

and hence when it cool down automatically the mass of magnesium is more than 1st mass because in that oxygen of air are added and that's why MgO are made the empirical formula of the magnesium oxide formed is MgO

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your question is incomplete.

you haven't mentioned what is a, b and c.

The change in the taste of the cake to vanilla flour is an example of a chemical change.

Chemical changes are changes which occur when substances undergo changes that are  no easily reversible an in which new substances are formed.

During chemical changes, large amounts of heat changes occur.

Some example of chemical changes is in the rusting of iron, the baking of breads and cake from a mixture of flour sugar and various flavors.

In the given scenario, Mira added vanilla flavored liquid to a cake and heated which resulted in a cake is having vanilla flour. The change in the taste of the cake after the vanilla flavor was added and the cake heated is an example of a chemical change.

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The molarity of a solution is 0.909 M.

m(CaCl₂) = 82 g; mass of calcium chloride

M(CaCl₂) = 111 g/mol; molar mass of calcium chloride

n(CaCl₂) = m(CaCl₂) ÷ M(CaCl₂)

n(CaCl₂) = 82 g ÷ 111 g/mol

n(CaCl₂) = 0.74 mol; amount of calcium chloride

V(CaCl₂) = 812 mL = 0.812 L; volume of calcium chloride

c(CaCl₂) = n(CaCl₂) ÷ V(CaCl₂)

c(CaCl₂) = 0.74 mol ÷ 0.812 L

c(CaCl₂) = 0.909 mol/L = 0.909 M; molarity of calcium chloride

Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.

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The difference in the reactivity of metals accounts for why some metals will react with hot water but not with cold water. For example, aluminum is less reactive than sodium and will only react with hot water but not cold water.

The reactivity of metals is the ability of a metals to lose electrons.

The reactivity of metals generally decreases from left to right across the periodic table but increases on going down a group.

Due to the differences in reactivity of metals, some metals are more reactive than others.

For example, the reactive metals sodium, potassium and calcium react with cold water to with differing degree of spontaneity to liberate hydrogen.

Some other metal like aluminum, zinc, and  iron can only react with hot water or steam to liberate hydrogen.

Therefore, the reactivity of a metal will determine if it will react with cold water or hot water.

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Answer:

All particles of matter are always in constant motion. In this case, the particles of the rock possess kinetic energy as they vibrate in place. However, the particles also contain potential energy due to their position and arrangement. This form of stored energy is responsible for keeping the particles bonded together.

Explanation:

We know that a fact is something that has been established to be true and does not need any kind of verification as it can be observed clearly and seen. A law is something that has gone through the rigorous process of scientific investigation and has been established to be true. A theory is an explanation for a scientific observation.

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For the reaction 4ch3ch3 14no2, the rate of the reaction in terms of the change in nitrogen concentration would be written as:+ (2/3) Δ[H2O]/Δt.

The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often known as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance. Two of the element's atoms combine to generate N2, an odorless and colorless diatomic gas, under standard pressure and temperature.

The majority of the atmosphere on Earth is made up of N2, making it the most prevalent uncombined element. All living things contain nitrogen, which is principally found in the amino acids that make up proteins, the nucleic acids that make up DNA and RNA, and the energy-transfer molecule adenosine triphosphate.

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Activated carbon might be added to a sample during the recrystallization processt to absorb impurities causing the recrystallization solution to have incorrect color.

Recrystallization is a technique (process) used to purify chemicals by dissolving both the impurities and a compound in an appropriate solvent, either compound or impurities can be removed from the solution, leaving the other behind. During the recrystallization, the impurities must also be soluble in the solvent.

Activated carbon is a form of carbon (C) used to filter an impurities from the solutions. It is activated to have pores that increase the surface area available for adsorption.

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The mass of water(in g) that can be vaporized at its boiling point(100°C) with 106 kJ of heat is "46.879g".

According to question:

ΔHvap=40.7kJ/mol

Now,

To calculate the enthalpy change of a reaction we use the formula:

ΔHreaction=Heat/Number of moles

∵Heat absorbed=106kJ

& ΔHreaction=Enthalpy change of the reaction=40.7kJ/mol

∴The number of moles evaporated by 106 kJ heat will be:

106×1÷40.7=2.6044 mol

Now,Number of moles=Given mass/Molar mass

∵Molar mass of water=18

& Number of moles of water=2.6044

Thus,Mass of water=Number of moles×Molar Mass of water

                              =2.6044×18

                               =46.879g

∴Mass of water(in g) that can be vaporized at its boiling point=46.879g

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(a) barium and oxygen - Braium oxide ([tex]BaO[/tex])

(b) calcium and phosphorus - Calcium phosphate - ([tex]Ca_{3}(PO_{4})_{2}[/tex])

(c) aluminum and sulfur - Aluminum Sulfide [tex]Al_{2}S_{3}[/tex]

lithium and nitrogen - Lithium nitride [tex]Li_{3} N[/tex]

The term ionic compound refers to a compound that is formed when ions are combined together. We know that ionic compounds are crystalline and that they are also soluble in water and polar solvents.  Most importantly, the ions are arranged in a very definite pattern.

Now let us see the names of the compounds formed by each pair;

(a) barium and oxygen - Braium oxide ([tex]BaO[/tex])

(b) calcium and phosphorus - Calcium phosphate - ([tex]Ca_{3}(PO_{4})_{2}[/tex])

(c) aluminum and sulfur - Aluminum Sulfide [tex]Al_{2}S_{3}[/tex]

lithium and nitrogen - Lithium nitride [tex]Li_{3} N[/tex]

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The family (group) of elements that have a valence-level electron configuration of 1 are alkali metals. Hence, the answer is option C.

A group or family in the periodic table consists of all the elements arranged in a single vertical column. There are eighteen groups in total. Elements in the same group tend to have the same chemical properties because they contain the same number of electrons in their outermost shells (valence electrons).

Elements in the first group or group 1 have only one electron in their outermost shell. They are known as alkali metals. They are called alkali metals because they react with water to form bases or alkali. These metals must be stored under oil as they are very reactive and easily react with air and water.

Alkali metals are also very electropositive and form ions by giving out their one valence electron, carrying a charge of +1. The three alkali metals are Lithium (Li), Sodium (Na) and Potassium (K), with Potassium being the most electropositive.

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The correct answer is ZnO (Zinc oxide).

Zn is doubly charged because ,Zn has 2 valency or we can say that zn contain 2 valence electron and has capacity to donate two electrons to oxygen. Oxygen can gain two electron from zinc to form zinc oxide.

Zinc oxide is applied to soothe minor skin irritations such diaper rash, burns, and cuts. You can use some things as sunscreen.

Only apply this medication to the skin. Observe all usage instructions on the product's packaging or those provided by your doctor. Ask your physician or pharmacist if you have any queries. Take care not to get this medication in your eyes. If the drug does go in your eyes, thoroughly rinse them with water. Only use this medication externally. Take not by mouth means the oral route of this medication should not be prescribed.

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Different substances are given as SO₂, HNO₃, BaCO₃, CO₂, Zn(NO₃)₂, H₃PO₄

KOH reacts with SO₂ at a lower temperature,

KOH + SO₂ → K₂ SO₃ + H₂ O

Nitric acid (an acid) and potassium hydroxide (a base) combine to form potassium nitrate (salt) and water.

KOH + HNO₃ → KNO₃ + H₂O

When substance potassium hydroxide and Barium carbonate,

KOH + BaCO₃ → K₂ CO₃ + Ba(OH)₂

Carbon dioxide and potassium hydroxide react to produce potassium carbonate and water. Carbon dioxide is taken out of the space station using potassium hydroxide.

KOH + CO₂ → K₂ CO₃ + H₂O

Potassium hydroxide reacts with zinc nitrate,

Zn(NO₃)₂ + KOH → Zn(OH)₂ + KNO₃

Potassium phosphate and water are created when potassium hydroxide and phosphoric acid combine.

KOH (aq) + H₃ PO₄ (aq) → K₃ PO₄ (aq) + H₂O (l)

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Answer:

C. To work on the mechanics of a pitchers throw
or... A. To design a stadium with the maximum number of seats

Explanation:

Answer:

Explanation:d

Answer:

Water dissolves with water because both are polar solvents

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The particles of the 4.361 L sample at 56.7°C will have larger average kinetic energy than that of  8.2 L sample at -6°C.

The average kinetic energy for one molecule at temperature T is given by  [tex]\frac{3}{2}kT[/tex], where [tex]T[/tex] is the absolute temperature.

The kinetic energy of any gas is directly proportional to its absolute temperature (T).  

Therefore, K.E. ∝ T

The translational kinetic energy of a gas is independent of the pressure, the molecular mass, or the nature of the gas. It depends only on the absolute temperature of the gas.

The absolute temperature of the sample with a volume 8.2L at -6°C is: [tex]T= 273-6 = 267K[/tex]  

The absolute temperature of the sample with a volume 4.361L at 56.7°C is:[tex]T=273+ 56.7 = 329.7K[/tex]

As the absolute temperature of the second sample is more than that of the first sample.

Therefore, the average kinetic energy of the molecules of the 8.2L sample at 56.7°C is larger than that of the 4.361L sample at -6°C.

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The name given to an ion that has lost electrons is cation. Details about cations can be found below.

A cation is a positively charged ion i.e. the one that would be attracted to the cathode in an electrolytic procedure.

Generally, an ion is an electrically charged atom. An ion can either be positively charged or negatively charged. The latter is called an anion while the former is called a cation.

A cation is formed when an atom loses electrons to become positively charged while an anion is formed when an atom accepts electrons to become negatively charged.

Therefore, it can be said that the name given to an ion that has lost electrons is cation.

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Rank the compounds in order of increasing boiling point:

a. CH₃(CH₂)₄I, b. CH₃(CH₂)₅I, c. CH₃(CH₂)₆I.

The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

The boiling point in this example depends on molar mass of the compounds.

The greater the molar mass of the compound, the greater is the boiling point.

M(CH₃(CH₂)₄I) = 197.9 g/mol; molar mass

M(CH₃(CH₂)₅I) = 211.9 g/mol

M(CH₃(CH₂)₆I) = 225.9 g/mol

The compound CH₃(CH₂)₆I has the greater molar mass, so it has the greatest boiling point.

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Sodium is an example of an alkali metal that reacts with water to form hydrogen gas and an alkaline solution.

Alkaline metals are lithium, sodium (Na), rubidium, potassium, cesium. They have low ionization energy and lose one electron very easy.

Atomic number of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.

Electron configuration of the sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.

Balanced chemical equation for the reaction of sodium with water:

2Na + 2H₂O → 2NaOH + H₂

NaOH is strong alkaline base.

H₂ is the hydrogen gas

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There must be 7 electrons present in the 3d energy level.

The atomic number is 27.

Thus, for 1st energy level, there is only 1 subshell present which is 1s² containing 2 electrons.

For the 2nd energy level, there are 2 subshells which are

2s² = 2 e⁻s

2p⁶ = 6 e⁻s

The number of electrons at the third energy level, x, can be assumed.

Then, 1s²2s²2p⁶3s²3p⁶4s²3dˣ (valence = 2 requires 2 electrons in 4s).

In the third level, there must be 7 electrons

since 27 - (2+2+6+2+6+2) = 7 = x.

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