Answer these for 40ps

Answer:

it expands

Explanation:

Answer:

a) it expands.

Explanation:

Water is more dense when it is a liquid, and less dense as a solid. This is why ice floats above water.

Hence, Ice expands when it freezes.

Answer:

This study is an overview of previous studies on lime (quick and hydrated) -treated soil. Lime is the oldest traditional stabilizer used for soil stabilization. The mechanism of soil-lime treatment involves cation exchange, which leads to the flocculation and agglomeration of soil particles. The high pH environment then causes a pozzolanic reaction between the free Ca+2 cations and the dissolved silica and alumina. Lime-treated soil effectively increases the strength, durability and workability of the soil. Such treatment also improves soil compressibility. A fluctuation behavior was observed on the influence of lime on soil permeability. However, the factors affecting the permeability of the soil-lime mixture should be extensively studied. Nonetheless, lime treatment has a number of inherent disadvantages, such as carbonation, sulfate attack and environment impact. Magnesium oxide/hydroxide are thus proposed as a suitable alternative stabilizer to overcome at least some of the disadvantages of using lime in soil stabilization.

Explanation:

Actually I have a pdf on it to explain more if you want but how to get it to you is the issue. well I'm guessing the one I've put out should be very much okay, I hope so .

Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.

It should be noted that sodium hydroxide simply means a corrosive cystaline solid which readily absorbs moisture until it dissolves.

In this case, sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base and will decrease the yield of the product.

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Divanillyl oxalate is a chemical that is produced by triethylamine. Sodium hydroxide is not used in its synthesis as it is a strong base.

Sodium hydroxide or caustic soda is an ionic compound with ions of sodium and hydroxide. The formula is shown as, [tex]\rm NaOH[/tex]. It is crystalline and absorbs moisture from the surrounding.

It is not used in the synthesis of divanillyl oxalate as it is a strong base with pH 14 that affects the yield of the product in the reaction.

Therefore, sodium hydroxide is not used in the synthesis reaction.

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Neutralization reaction is the reaction that occur between acid and base.

Neutralization reaction is the reaction that take place between acid and base to produce salt and water. For examples HCl react with NaOH to produce NaCl and H2O

Therefore, Neutralization reaction is the reaction between acid and base.

The question is not complete but the option are gotten from another website.

Here are the options.

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Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.

The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.

The question is incomplete hence the exact nature of the substituents can not be determined.

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In resonance, the species with lone pairs donate electrons while the substituent takes electrons away from another species when deficient by resonance.

When the electron donor or the withdrawal groups creates the electron density on the molecule then it is called the inductive effect. This results in the creation of permanent dipoles in the bonds of the molecules.

Atom attached to a benzene molecule with higher electronegativity than hydrogen atom then, it will be an acceptor while with lower electronegativity will be a donor.

The movement of the electron pair like lone pair and pi bond in a molecule by the delocalization is called the resonance effect. The electron donation and acceptance depend on the nature of the substituent molecule.

If the atom attached to the benzene molecule is electron-rich, it will be a donor, while the electron-deficient will accept the electron by the method of resonance effect.

Therefore, the nature of the substituent determines the resonance and the inductive effect.

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Answer:

GEL

Explanation:

A colloid is a type of mixture that consists of insoluble particles in another substance. Liquid dispersed in a colloidal solid is called a gel.

A gel is the dispersion of liquid molecules in a solid medium. It is a type of mixture that includes the suspension of particles in another substance. They are colloid that behaves like solid.

The liquid molecules of the medium become thick and viscous in the solid particles and form aggregates of the particles.

Therefore, colloid in which liquid is dispersed in solid is gel.

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Answer:

1.12x10-10 or 0.63 ewan

Explanation:

Correct option is C)

The distance of centre of mass from carbon atom is,

xcm=m1+m2m1x1+m2x2

=12+1612×0+16×1.1

=0.63A˚

Thus, the centre of mass is 0.63A˚ from carbon atom.

The distance between a carbon atom and an oxygen atom in the co molecule is 0.63

Distance is the measurement of the farness of two objects from each other.

The distance between the molecules can be calculated by the given formula

[tex]xcm = m_1+m_2m_1\times 1+m_2 \times 2[/tex]

Putting the values in the equation

[tex]xcm = 12+1612 \times 0+16 \times 1.1 = 0.63 A^\circ[/tex]

Thus, the distance between a carbon atom and an oxygen atom in the co molecule is 0.63

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Answer:

Teflon

Explanation:

Based on the equation of the reaction, the moles of chlorine gas initially in the vessel is 0.12 moles

The moles of chlorine initially present is determined using the equation of the reaction:

At STP, 1 mole of P4 reacts with 6 moles of chlorine.

Molar mass of P4 = 124.0 g

Molar mass of chlorine = 71.0 g

Mass of P4 in reaction vessel = 250 mg = 0.25g

moles of P4 in 0.25 g = 0.25/124 = 0.02 moles

0.02 moles of P4 will react with 0.02 × 6 moles of chlorine = 0.12 moles of chlorine.

Therefore, the moles of chlorine gas initially in the vessel is 0.12 moles.

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The structure of the compound n‑ethyl‑3‑methylpentanamide is attached to this answer.

The IUPAC nomenclature was given in order for us to be able to draw the structure of a compound from its name. This is the generally accepted means of naming compounds globally.

The structure of the compound n‑ethyl‑3‑methylpentanamide in which all the hydrogen attched are shown attached to this answer.

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The structure of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.

N-ethyl-3-methylpentanamide has a five-carbon parent chain attached to an amide functional group in its structural formula.

An amide's N-atom also has an ethyl substituent. At the C-3 position of the parent chain, a methyl group is substituted.

Thus, the of n‑ethyl‑3‑methylpentanamide. Include all hydrogen atoms are attached. Its chemical formula is C₈H₁₇NO.

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Answer:

...

Explanation:

Explanation:

BECAUSE I DONT KNOW AS WELL CAN SOME ONE HELP.

Answer: Calcium

Hope this helps

Answer:

Wind depositing sand to build up sand dunes.

Explanation:

Answer:

b

Explanation:

many solids are crystalline hence a is eliminated

graphite contains free electrons while diamond uses all electrons in bonding and many substances have that property hence c is eliminated

only substances made up of carbon produce carbondioxide as the product when burnt

Answer:

The formation of double and triple bonds is not as widespread among the atoms of the periodic table as one might expect. At least one of the atoms involved in a multiple bond is almost always C, N, or O, and in most cases both atoms are members of this trio

Covalent bonding occurs when electrons are shared between atoms. Double and triple covalent bonds occur when four or six electrons are shared between two atoms, and they are indicated in Lewis structures by drawing two or three lines connecting one atom to another.

Explanation:

Explanation:

please mark me as brainlest

For a solution to be tested in this experiment and must be buffered to pH of 10,  the [OH-] change will be, The hydroxide concentration would be higher and the formation of insoluble hydroxide salts with Mg^2 and Ca^2 would cause the determined concentration of water hardness to be too low.

Generally, the equation for the  Total hardness is mathematically given as

[tex]T=\frac{A*D*1000}{B}[/tex]

Where

[tex]D=\frac{molarity}{0.01}[/tex]

D=0.02/0.01=2

Therefore

[tex]T=\frac{A*D*1000}{B}\\\\T=\frac{20.4*2*1000}{25}[/tex]

T=1632ppm

in conclusion, The hydroxide concentration would be higher .

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The solution to be tested in this experiment must be buffered to a pH of 10. If the pH is high to 12, the change of [OH-] is 1632 ppm.

OH- ion is the hydroxide ion or hydroxyl ion. It is made up of a hydrogen and oxygen ion with a covalent bond.

[tex]A =\dfrac{A \times D \times 1000}{T} \\[/tex]

The buffered pH is 10

The higher pH is 12

D = molarity divided by 0.01, that is the pH

[tex]D = \dfrac{molarity }{0.01}\\\\D = \dfrac{0.02 }{0.01} = 2[/tex]

Now, putting the values in the first equation

[tex]A =\dfrac{20.4 \times 2 \times 1000}{25} = 1632 \;ppm[/tex]

Thus, the correct option is the change in hydroxide ion is 1632 ppm.

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Answer:

Medication

Explanation:

These pharmaceuticals can pollute our water and unintentionally expose us to the chemicals in these medications. Recent studies have found that medicines flushed down the drain can contaminate our lakes and streams, which can hurt fish and other aquatic wildlife, and end up in our drinking water.

Answer:

Answer: C

Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.

Melamine formaldehyde is a thermosetting plastic (or thermoset) that strengthens as it is heated during its preparation.

Answer:

1.312788 atm

Explanation:

Answer:

45830.4 moles

Explanation:

Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:

PV = nRT

The ideal gas law is:

PV = nRT

where,

P = Pressure

V = Volume

R = Gas constant

T =Temperature

n = moles

Given:

Moles in container = 1.95

Temperture = 294.85 K

Pressure = 3.75 atm

Volume =?

Substituting the values:

V = nRT/P

V = 1.95 × 0.082 × 294 / 3.75

Volume = 12.5 L

Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:

PV/RT = n

0.998 × 12.5 / 0.082 × 301.25 = n

n = 45830.4 moles

Therefore, 0.521 moles is still present in the container.

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The number of moles of iron produced can be obtained by the use of  stoichiometry.

The term stoichiometry has to do with mass - mole or mass - volume relationships. Stoichiometric relationships could be used to determine the amount of substance.

Now the reaction equation as well as other details are not shown in this question hence a numerical anwer can not be provided. As such, we can know that the balanced reaction equation can always be used to obtain the amount of iron by stoichiometry.

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Answer:

Explanation:

The relation between molecular (formula) mass and molar mass page 44 . To obtain one mole of copper atoms (6.20 x 1023 ne atoms) weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.

39 g H

2

O

 contains

1.3

×

10

24

molecules H

2

O

.

Explanation:

One mole of water has a molar mass of

18.015 g/mol

and

6.022

×

10

23

molecules H

2

O

. Therefore,

1 mol H

2

O

=

18.015 g H

2

O

=

6.022

×

10

23

molecules H

2

1O

Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.

39

g H

2

O

×

1

mol H

2

O

18.015

g H

2

O

×

6.022

×

10

23

molecules H

2

O

1

mol H

2

O

=

1.3

×

10

24

molecules H

2

O

39 g H

2

O

 contains

1.3

×

10

24

molecules H

2

O

.

Explanation:

One mole of water has a molar mass of

18.015 g/mol

and

6.022

×

10

23

molecules H

2

O

. Therefore,

1 mol H

2

O

=

18.015 g H

2

O

=

6.022

×

10

23

molecules H

2

1O

Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.

39

g H

2

O

×

1

mol H

2

O

18.015

g H

2

O

×

6.022

×

10

23

molecules H

2

O

1

mol H

2

O

=

1.3

×

10

24

molecules H

2

O

39 g H

2

O

 contains

1.3

×

10

24

molecules H

2

O

.

Explanation:

One mole of water has a molar mass of

18.015 g/mol

and

6.022

×

10

23

molecules H

2

O

. Therefore,

1 mol H

2

O

=

18.015 g H

2

O

=

6.022

×

10

23

molecules H

2

1O

Multiply the given mass of water times the conversion factors that cancel grams and moles of water, leaving molecules of water, as demonstrated below.

39

g H

2

O

×

1

mol H

2

O

18.015

g H

2

O

×

6.022

×

10

23

molecules H

2

O

1

mol H

2

O

=

1.3

×

10

24

molecules H

2

O

Answer:

994.56

Explanation:

41.44 multiplied by 4, that gives us a month.

Then multiply by 6.

Answer:

You can use a PH tester do identify the PH of each solution.  Depending on what solutions ur testing, u shouldn't mix them as for there could be either a minor or bad chemical reaction

Explanation:

The solubility curve can show the variation of solubility with temperature.

A saturated solution is one in which there is just enough solute as it can dissolve at a given temperature. The imege is missing hence the question is incomplete.

The solubility curve shows us the solubility of each substance but unfortunately we do not have it hence we can not answer the questions but we do know that the solubility curve can show the variation of solubility with temperature.

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This is because amino group of p-aminobenzoic acid is an aniline and is less electrophilic than an alkyl amine.

This is an aromatic amine which consists of a phenyl group attached to an amino group.

The amino group of p-aminobenzoic acid being an aniline makes it less electrophilic which is why an alkyl amine participates in the reaction instead.

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The amino group of p-aminobenzoic acid does not participate in the reaction as this is an aniline and is less electrophilic than an alkyl amine.

Aniline is an aromatic amine molecule in which phenyl group is attached with an amino group.

The amino group present in the p-aminobenzoic acid behave as an aniline as a result of which it becomes less electrophilic in nature and this is the reason why an alkyl amine participates in the reaction instead of the p-aminobenzoic acid.

Hence amino group of p-aminobenzoic acid is less electrophilic in nature and that's why not participate in the reaction.

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Activation energy will be less than the energy of the products in an exothermic reaction. Therefore, option (D) is correct.

In this type of reaction, the energy of the products is lower than the energy of the reactants. As a result, the difference in energy is released as heat or light, which can be detected by measuring the temperature or observing the light emitted during the reaction.

Exothermic reactions occur spontaneously, meaning they do not require an external energy source to start the reaction. Common examples of exothermic reactions include combustion, oxidation, and neutralization. These reactions often involve the formation of stronger bonds between atoms or molecules, which releases energy in the form of heat or light.

Exothermic reactions play an important role in many natural and industrial processes, including respiration, photosynthesis, and the production of electricity in power plants.

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