Please answer this question for grade 9

Answer:

I believe as sharing bit

Answer:

easement

Explanation:

This is the definition of 'easement' .

An aqueous solution of a strong base has a pH of 10. 220 at 25°C then concentration of the base if the base is

(a)  LiOH =  1.66×[tex]10^{-4}[/tex]  M

(b)  [tex]Ba(OH)_{2[/tex] =  3.32×[tex]10^{-4}[/tex]M

Calculation ,

For calculation of concentration of the   LiOH and  [tex]Ba(OH)_{2[/tex] first we have to calculate pOH of the solution.

pH + pOH = 14

pOH = 14 - pOH = 14 - 10.22  = 3.78

pOH = -㏒ [ [tex]OH^{-}[/tex] ]

[ [tex]OH^{-}[/tex] ] = [tex]10^{-pH}[/tex] =  [tex]10^{-3.78}[/tex] = 1.66×[tex]10^{-4}[/tex]

So ,  concentration of the base LiOH =  1.66×[tex]10^{-4}[/tex]

So ,  concentration of the base [tex]Ba(OH)_{2[/tex] =  1.66×[tex]10^{-4}[/tex] ×2 = 3.32×[tex]10^{-4}[/tex]

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The name of CuO is copper II oxide and its bond type is ionic or electrovalent bond.

An ionic or electrovalent bond is the type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.

This electrostatic attraction is as a result of the transfer of electrons from the metallic element to the non-metal.

According to this question, CuO is a chemical compound consisting of two elements namely; copper and oxygen. The compound name is copper II oxide.

Copper as a metal transfers electrons to oxygen atoms, hence, an ionic bond is formed between the molecules.

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Answer:

D.) magnesium and sulphur​

Explanation:

Generally, ionic bonds form between a metal and a nonmetal.

Generally, covalent bonds form between two nonmetals.

Generally, metallic bonds form between two metals.

Nonmetals are located on the right side of the periodic table (apart from the noble gases in the final column). Hydrogen is also a nonmetal. Metals are every other element in the periodic table.

A.) Hydrogen (nonmetal) and carbon (nonmetal) = covalent

B.) Aluminum (metal) and magnesium (metal) = metallic

C.) Silicon (nonmetal) and chlorine (nonmetal) = covalent

D.) Magnesium (metal) and sulphur (nonmetal) = ionic

Ksp(the solubility product constant) = [Cu⁺] [I⁻]

So, the Ksp for Cui would be:

Ksp = (2.26 × 10⁻⁶) (2.26 × 10⁻⁶) = 5.11 x 10⁻¹²

Formula used:

K = [tex]K_{sp} = [A^+]^a [B^-]^b[/tex], where

Ksp = solubility product constant

A⁺    = cation in an aquious solution

B⁻ = anion in an aqueous solution

a, b = relative concentrations of a and b

The equilibrium constant for a solid material dissolving in an aqueous solution is the SOLUBILITY PRODUCT CONSTANT, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.

Take into account the general dissolving response (in aqueous solutions) below:

                           aA(s)⇔cC(aq)+dD(aq)

The molarities or concentrations of the products (cC and dD) must be multiplied in order to find the Ksp. Any product that has a coefficient in front of it must be raised to the power of that coefficient (and also multiply the concentration by that coefficient).

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Answer:

.75 J / g-°C

Explanation:

Specific heat =   J / gm-C

                   = 7500 J /( 2000 gm * 5 c) =   .75 J / g-°C

Myoglobin in red slow twitch muscle pulls the O2 off the blood. Your striated muscles, which include your cardiac muscles and skeletal muscles, contain the protein known as myoglobin. Its primary job is to give your muscles' cells oxygen (myocytes). Your body's cells require oxygen to function.

Myoglobin is harmful to the kidneys in large doses. Myoglobin can be released in large volumes into the blood stream in response to severe trauma or muscle injuries, which can harm the kidneys and eventually lead to renal failure. A globin and heme molecule combine to form the dark red protein known as myoglobin.

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The theoretical yield isopentyl acetate is of the 1.82 g

Now the theoretical yield is the yield of the product as obtained from the stoichiometry of the reaction. In this case, we know the reaction is 1:1.

Mass of  isopentyl alcohol = 0.810 g/mL * 1.5 mL = 1.215 g

Mass of acetic acid = 1.05 g/mL * 2 mL = 2.1 g

Number of moles of  isopentyl alcohol = 1.215 g/88 g/mol = 0.014 moles

Number of moles of acetic acid = 2.1 g /60 g/mol = 0.035 moles

Hence   isopentyl alcohol is the limiting reactant.

1 mole of   isopentyl alcohol yields 1 mole of isopentyl acetate

0.014 moles   isopentyl alcohol yields 0.014 moles of isopentyl acetate

Mass of of isopentyl acetate = 0.014 moles * 130 g/mol = 1.82 g

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A gas bottle contains 8. 61×1023 oxygen molecules at a temperature of 359. 0 k then the thermal energy of the gas is 6.35KJ.

Thermal energy is the energy contained within a system which is responsible for its temperature. Heat is also termed as flow of thermal energy.

Thermal energy is directly proportional to the temperature. As temperature increase thermal energy increases.

Given,

temperature = 395K

Number of oxygen molecules= 8.61 × 10^(23)

Firstly we will calculate the number of moles = N/A

where A is the avagadro number = 6.022 × 10^(23)

number of moles = 8.61 × 10^(23)/6.022 ×10^(23)

number of moles = 1.42moles

Using the energy equation,

E = 3/2 × nRT

where R is the gas constant = 8.314J/molK

E = 3/2 × 1.42 × 8.314 × 359

= 6357.4J

= 6.35KJ

Thus, we found that the thermal energy of the gas is 6.35KJ.

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PbCl2 is more soluble in acid as compared to other salts of lead.

Four salts of lead are more soluble in acid solution than water.

[tex]PbS[/tex] ⇒ [tex]Pb^{2+} + S^{2-}[/tex]

[tex]2H^{+} + S^{2-}[/tex]  ⇒ [tex]H_{2}S[/tex]

As [tex]S^{2-}[/tex] ions are removed from the solution by the formation of [tex]H_{2} s[/tex], the solubility of [tex]PbS[/tex] increases in acid solution.

[tex]PbCo_{3}[/tex] ⇒ [tex]Pb^{2+} + Co_{3} ^{2-}[/tex]

[tex]2H^{2+} + Co_{3} ^{2-}[/tex]  ⇒ [tex]H_{2} Co_{3}[/tex]

   As [tex]Co_{3}[/tex] ions are removed from the solution by the formation of [tex]H_{2} Co_{3}[/tex], the solubility of [tex]PbCo_{3}[/tex] increases in acid solution.

[tex]PbCl_{2}[/tex] ⇒ [tex]Pb^{2+} + 2Cl^{-}[/tex]

[tex]2H^{+} + 2Cl^{-}[/tex] ⇒[tex]2HCl[/tex]

As [tex]Cl^{-}[/tex] ions are removed from the solution by the formation of HCl, the solubility of [tex]PbCl_{2}[/tex] increases in acid solution.

[tex]PbI_{2}[/tex] ⇒ [tex]Pb^{2+} + 2I^{-}[/tex]

[tex]2H^{+} + 2I^{-}[/tex] ⇒ [tex]2HI[/tex]

As [tex]I^{-}[/tex] are removed from the solution by the formation of [tex]HI[/tex], the solubility of [tex]PbI_{2}[/tex] increases in acid solution.

Thus from above we concluded that all the given salt of lead is more soluble in acid solution than in water.

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Answer:

butanal

Explanation:

It's not 1-propanone because otherwise you have OH bonded to C not O and H bonded to C separately. 2-butanol means that the O and H would be bonded to a different C atom, and it's not propyl hydrogen ether because the O would be in the chain of bonded Cs.
Hope this helps :)

Answer:

Butanal

Explanation:

trust

Low pressure region is formed as air masses move horizontally

Basically, an air mass is a volume of air that is doing something. A high pressure region and a low pressure area on a weather chart are examples of air masses. It may be the cloud burst that you were recently trapped in. Essentially a description of a zone that behaves consistently.

The horizontal motion of air is known as wind. When there are variations in air pressure, winds begin to blow. A force is created when air pressure is higher in one location than another. High pressure pushes the force in the direction of lower pressure.

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By exchanging them with sodium (or potassium) ions, cation exchange water softeners eliminate the calcium and magnesium ions present in hard water.

Ion exchange is the reversible exchange of ions, or charged particles, with other ions that have a similar charge. This happens when ions with a comparable charge that are present in the surrounding solution effectively switch places with ions that are located on an insoluble IX resin matrix.

The ion exchange procedure eliminates the water's enduring hardness. Hardness is eliminated in this technique through the use of resins. Cl- and anion exchange resin are used to exchange Ca++/Mg++ ions and SO4-2 ions (RNH2OH). The ion exchange procedure totally removes all of the total dissolved solids.

In ion exchange, calcium and magnesium, which are hardness ions, are removed and replaced with non-hardness ions, usually sodium, which is provided by dissolved sodium chloride salt, or brine.

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Aside from the high-energy molecules like ATP and NaDH . The net reaction for the complete oxidation of acetyl-COA in the TCA cycle is given as ,

Pyruvate → 3[tex]CO_{2}[/tex]

The reaction of the cycle are carried out by eight enzymes that completely oxidize acetate ( a two carbon molecule ) , in the form of acetyl-COA , into two molecules each of carbon dioxide and water . The net yield of one turn of the TCA cycle in terms of energy - containing compounds is one GTP , one FADH2 , and three NADH molecules . The NADH molecules are used in oxidative

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Point defects are possible for al2o3 as an impurity in mgo. then 2 Al3+ must be added to form 1 Mg2+  must be added to form each of these defects

Point defects are zero-dimensional lattice defects, meaning they lack lattice structure in any dimension. Impurity atoms in a pure metal, vacancies, and self-interstitials are examples of common point defects.

Point defects are zero-dimensional lattice defects, which means they lack any kind of lattice structure. Point defects include, but are not limited to, atoms of impurity in a pure metal, vacancies, and self-interstitials.

The term "point defect" refers to the flaw or imperfection that results from the placement of a point-like constituent particle, such as an atom, an ion, or a molecule, in a crystalline structure.

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ANSWER: From this experiment, Jeff can conclude that the heat capacity of oil is lower than that of water which means that oil requires less energy per gram of liquid in order to change its temperature.

The pH at the equivalence point always not equal to 7 in a neutralization titration when titration occur between weak acid and weak base , strong acid and weak base or strong base weak acid. The reason behind it is given as,

When strong acid is neutralize with strong base then it form neutral product at the equivalence point. Hence the final conclusion is that the pH of the solution in which titration is takes place between strong acid and strong base is 7 that is neutral left titration between all type of acids and bases ha pH not equal to 7 .

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There are some types of properties about the substance that you tested did you use to determine whether you thought it was an acid or base. Some are given below.

Substances that are used to determine whether a particular substance is an acid or  base are called indicator. The indicator is a dye that is weak an organic acid or base that changes color when it is added to an acid and base.

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X(N03)2

Given: Consider a hypothetical atom x

molecular formula of calcium nitrate = Ca(NO3)2

formula of x chloride is xcl2

molecular formula for x nitrate = ?

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Answer:

When acid reacts with base it will form salt and water

When a base reacts with an acid, a salt and water will form. Therefore, the correct option is option A.

The exchange of one or perhaps more hydronium ions, H+, amongst species that can be either neutral (molecules like water, H2O, or acetic acid, CH3CO2H), or electrostatic attraction (ions like ammonium, NH4+, hydroxide, OH, or carbonate, CO32), is what is known as an acid-base reaction.

It also includes equivalent behavior of acidic ions and molecules (aluminum chloride, AlCl3, as well as the silver ion AG+) that do not give hydrogen ions. When a base reacts with an acid, a salt and water will form.

Therefore, the correct option is option A.

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The volume of water vapour would be produced at 19°C and 780 torr is 548.5mL.

If 400 ml of CO2 is produced at 30°C at 740 torr, then number of moles can be calculated as:

By using ideal gas equation:

P1V1 = N1R1T1

P1 = pressure = 740torr

V1 = 400 ml = volume of CO2

R = Gas constant = 8.314

T = 273+30 = 303 k

740×400 = N1×8.314×303

N1 = (740×400) /(8.314×303) =117.5.

Chemical equation

C2H6 ---- 2CO2 + 3H2O.

As we noticed from the equation that

2 moles of CO2 = 3 moles of H2O

1 moles of CO2 × 1 moles of H2O

Then N2 = 117.5 moles of CO2 = 3/2 × 117.5 moles of H2O

By using ideal gas equation:

P2V2 = N2RT2

V2 = 3/2 × 117.5 × 8.314 × 292/ 780

= 548.5ml.

Thus, we found that the volume of water vapour would be produced at 19°C and 780 torr is 548.5mL.

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According to the IUPAC convention, alkyl group names should be located at the end  of the name of the main chain.

IUPAC is a system of chemistry in which the naming of the organic compound has to be done based on their structure by following some rules given by the IUPAC system. Alkanes, alkenes and alkynes are the three major functional groups of organic chemistry.

The full form of IUPAC is the international union of pure and applied chemistry.

Alkyl groups are same as alkenes just the end name of both are different but both of then specifies the single bond in structure and name has to be written in last.

Therefore, according to the IUPAC convention, alkyl group names should be located at the end  of the name of the main chain.

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As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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Answer:

Anhydrous calcium nitrate reaction with water is highly endothermic

Developing enduring relationships and sensing love - Taking care of others fosters empathy and the capacity to connect with others, especially through trying circumstances. Additionally, 77% of caregivers who are also employed claim that their relationship with their parents and/or in-laws has improved as a result of their caregiving.

Family supports us during both the best and worst of times, which makes these ties crucial. Family is crucial because they can provide unwavering love, support, and stability; they constantly strive to bring out the best in you even when you are unable to perceive it for yourself.

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Out of the many tests that is used to determine the presence of cyclohexanol in a product is the Lucas test.

The Lucas test is a chemical reactant that is used to identify the presence and level of alcoholism in a given solution.  Cyclohexanol shows many chemical properties as do most substances, one of those property is the presence of an alcohol group.

The presence of this chemical group makes it possible to test for cyclohexanol using the Lucas test. The Lucas test will cause reactions in the presence of alcohol and convert alcohols into chloroalkanes, which is nearly insoluble in aquatic solutions.

From above, we concluded that a positive result will look like the solution separates into a cloudy chloroalkane-containing part on top of a much clearer layer.

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Answer:

1.26 m

Explanation:

The molality equation looks like this:

Molality = moles solute / mass solvent (kg)

In this case, sulfuric acid is the solute and water is the solvent. To calculate the molality, you need to (1) convert grams solute to moles solute (via molar mass), then (2) convert grams solvent to kilograms solvent, and then (3) calculate the molality.

(Step 1)

Molar Mass (H₂SO₄): 2(1.008 g/mol) + 32.065 g/mol + 4(15.998 g/mol)

Molar Mass (H₂SO₄): 98.073 g/mol

24.4 grams H₂SO₄                1 mole
-----------------------------  x  ------------------------  =  0.249 moles H₂SO₄
                                         98.073 grams

(Step 2)

198 grams H₂O                 1 kg
-------------------------  x  ----------------------  =  0.198 kg H₂O
                                    1,000 grams

(Step 3)

Molality = moles solute / mass solvent

Molality = 0.249 moles H₂SO₄ / 0.198 kg H₂O

Molality = 1.26 m

There are 17.97 moles of calcium chloride would react with 5. 99 moles of aluminum oxide .

The balanced chemical equation between  reaction between calcium chloride and aluminum oxide is given as,

[tex]3CaCl_{2} (aq)+Al_{2} O_{3} (s)[/tex] → [tex]3CaO_{2} (s)+2Al Cl_{3} (aq)[/tex]

The molar ratio of above reaction is  3:1

It means 3 moles of calcium chloride is require to react one mole of aluminum oxide.

The number of moles of calcium chloride requires to react with  5. 99 moles of  aluminum oxide  = 3 × 5. 99 = 17.97 moles

The equation in which number of atoms of elements in reactant side is equal to the number of atoms of elements in product side is called balanced chemical equation .

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Answer:

Remains the same

Explanation:

Until the ice is all melted the water should remain at 0° C....

  the ice melting is a constant temp process and absorbs heat as it melts at 0 C