Why does the cake and pan feel different to your hand when you take them out of the oven? Explain

Answer:

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Answer:

Solubility product constant

Solubility

Saturated Solution

Common ion effect

Molar Solubility

Explanation:

If i have the ionic compound KNO3 for instance; the solubility product of the compound is the  product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation.

E.g

KNO3(s) ------> K^+(aq) + NO3^-(aq)

Ksp = [K^+] [NO3^-]

The solubility of any given substance is defined as mass of the substance in grams that dissolves in 100 mL of water.

A saturated solution is one that has dissolved the maximum amount of  solute at a given temperature. If more solute is added, it will not dissolve.

If i add AgCl to a solution of HCl, the solubility of AgCl in HCl solution is found to be less than its solubility in pure water because of the presence of a common Cl^-. Hence, common ion effect is a decrease in the solubility of an ionic compound as a result of the addition of a common ion to the solution.

The molar solubility of a substance is defined as the maximum number of moles of a substance that will dissolve in 1 L of solution.

The terms used to describe the followings are:

The molarity is the concentration unit used for the determination of the moles of solute in the liter of solution.

For example:

[tex]\rm H_2A\;\rightarrow\;2H^+\;+A^-\\Solubility\;product\;constant=[H^+]^2[A^-][/tex]

The solution with the maximum amount of salt dissolved at a certain temperature is termed the saturated solution. Further addition of the solute results in the precipitation of the solute in the solution.

The effect raised with the addition of the common ions is termed the common ion effect.

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Answer:

2:1

1.2 × 10² g

Explanation:

Step 1: Write the balanced combustion equation

CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O

Step 2: Establish the appropriate molar ratio

According to the balanced equation, the molar ratio of O₂ to CH₄ is 2:1.

Step 3: Calculate the moles of CH₄ required to react with 15 moles of O₂

We will use the previously established molar ratio.

15 mol O₂   1 mol CH₄/2 mol O₂ = 7.5 mol CH₄

Step 4: Calculate the mass corresponding to 7.5 moles of CH₄

The molar mass of CH₄ is 16.04 g/mol.

7.5 mol × 16.04 g/mol = 1.2 × 10² g

Answer:

26.0 mL

Explanation:

The reaction that takes place is:

First we calculate the molar concentration of the diluted sulfuric acid solution, using the C₁V₁=C₂V₂ formula:

Now we calculate how many H₂SO₄ moles would there be in 10.00 mL of this diluted solution, using the definition of molarity:

Then we convert 3.25 mmoles of H₂SO₄ into mmoles of NaOH, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate the required volume of the NaOH solution, using the definition of molarity:

Answer:

[tex]T_2=-53.15\°C[/tex]

Explanation:

Hello there!

In this case, in agreement to the Charles' law which states that the volume and temperature relate to each other via a directly proportional relationship at constant pressure, we can write:

[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]

Thus, given V1, V2 and T1 (310 in Kelvin), we can solve for the final temperature as shown below:

[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{310K*32.5mL}{45.8mL}\\\\T_2=220 K-273.15K\\\\T_2=-53.15\°C[/tex]

Best regards!

Answer:

No, they are not able to bond.

Explanation:

Hello there!

In this case, regarding chemical bonds, it is necessary to remember that these come up when a metal is bonded with a nonmetal, or, when two nonmetals get bonded; however, even there exist a type of denominated metallic, it is not eligible for boron and lithium because they tend to stable as cations (positive) and therefore, equal charges are not eligible for bonding, thus, boron and lithium would not be able to bond.

Best regards!

Answer:

To split an atom a neutron, traveling at an accurate speed must be shot at the nucleus.

Explanation:

Answer:

True

Explanation:

Answer: C diamond has a different crystal structure from graphite

Explanation:

The difference between the properties of  two forms of carbon is that

Diamond has a crystal structure  different from graphite.

Graphite and Diamond are known as allotropes of Carbon as they have the

same chemical properties but different crystal structure.

Diamonds form a 3 crystal lattice with no flexibility while Graphite are

bonded to sheets which makes them slide easily within one another and

gives it its soft texture.

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Answer:  Unbalanced : H2O

Balanced : 2H2O

Explanation:

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H2O

Explanation:

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

Answer: The rate increases 3 times on raising the temperature from 20degree to 30 degree​

Explanation:

According to Arrhenius equation with change in temperature, the formula is as follows.

[tex]ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}][/tex]

where [tex]k_2[/tex] = rate constant at temp [tex]T_2[/tex]

[tex]k_1[/tex] = rate constant at temp [tex]T_1[/tex]

[tex]E_a[/tex]= activation energy

R= gas constant

[tex]T_1[/tex]= temperature = [tex]20^0C=(20+273)K=293K[/tex]

[tex]T_2[/tex]= temperature = [tex]30^0C=(30+273)K=303K[/tex]

[tex]ln \frac{k_{2}}{k_{1}} = \frac{-85\times 1000J/mol}{8.314J/Kmol}[\frac{1}{303} - \frac{1}{293}][/tex]

[tex]ln \frac{k_{2}}{k_{1}}=1.15[/tex]

[tex]\frac{k_{2}}{k_{1}}=3[/tex]

Thus rate increases 3 times on raising the temperature from 20degree to 30 degree​

Answer:

If capital R is round, than the RR and Rr will mean round, and the two rr's are wrinkled. that means the answer to both is 50%

Explanation:

hope that helps

Answer:

Heat reaction

Explanation:

Heat must be applied in order to melt a substance.

Potassium chloride

Iron (II) chloride

Copper (II) sulfate

Aluminum oxide

Iron (III) oxide

Remember to put roman numerals for the compounds where the metal has more than one possible oxidation state. For example, you see iron here with a +2 charge in one compound and then +3 charge in another. If the metal only has one possible oxidation state (like potassium and aluminum), you don't need a roman numeral.

Answer:

speed

Explanation:

Speed is the rate at which something moves. The speed of light is faster than the speed of sound.

Answer:

The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution.

At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal.

The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium.

To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.

Answer:

A weak acid is one that does not dissociate completely in solution; this means that a weak acid does not donate all of its hydrogen ions (H+) in a solution. ... Therefore, the concentration of H+ ions in a weak acid solution is always less than the concentration of the undissociated species, HA.

Explanation:

Hope it helps

FOLLOW MY ACCOUNT PLS PLS

Explanation:

The two main categories of energy are potential energy (stored

energy) and kinetic energy (energy presently doing

work or causing change)...I hope this helps.

Answer:

1.07 g Ba

Explanation:

Hello there!

In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:

[tex]4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa[/tex]

Best regards!

Answer:

during interphase the cells start to grow

cells grow, store up energy, and take in nutrients

hope it helped :)

Answer:

See explanation

Explanation:

Echo is the reflection of sound waves. Recall that ultrasound are also sound waves of high frequency.

When ultra sound meets an obstacle such as a bone, it is reflected backwards and gives rise to an echo back in the transducer.

Since ultrasound is high frequency sound wave wave; It does not passes through bone due to the high density of the bone, the data required may now be collected.

Answer:

Carbon is moving into the air

Answer:

(14)The pH is 8.3 and is basic

(15) pOH = 11.0 The solution is acidic

Explanation:

(14) From the question,

pH = -log[H₃O⁺]............... Equation 1

Given: H₃O⁺ = 5.6×10⁻⁹ M

Substitute the value above into equation 1

pH = -log[5.6×10⁻⁹]

pH = 8.3

The pH is 8.25 and is basic.

(15)

pOH = -log[OH⁺]................ Equation 2

Given: [OH⁺] = 8.34×10⁻¹² M

Substitute into equation 2

pOH = -log[8.34×10⁻¹²]

pOH = 11.0 Hence the solution is acidic

Answer:

https://courses.lumenlearning.com/boundless-biology/chapter/atoms-isotopes-ions-and-molecules/

Explanation:

Answer: [tex]Ca(NO_3)_2[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which on e of the product is formed as a solid is called as precipitation reaction.

The balanced chemical equation for a precipitation reaction is:

[tex]2Na_3PO_4(aq)+3Ca(NO_3)_2(aq)\rightarrow Ca_3(PO_4)_2(s)+6NaNO_3(aq)[/tex]

The salt that should be participated in the double displacement reaction should form the insoluble compound(s) i.e. Ca(NO3)2.

It is the one where the ions should be exchanged. The salts should be soluble in water that should be designated by symbol and can be insoluble in water also same in the solid form. The same should be presented by (s) when the chemical formulas are mentioned. Also, it is one of the product that should be created known as the precipitation reaction.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.86 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.86}{6.02} \\ = 0.641196...[/tex]

We have the final answer as

Hope this helps you

Answer: The empirical formula and the molecular formula of the hydrocarbon is [tex]C_2H_3[/tex] and [tex]C_4H_6[/tex] respectivley.

Explanation:

The chemical equation for the combustion of hydrocarbon having carbon, hydrogen and oxygen follows:

[tex]C_xH_y+O_2\rightarrow CO_2+H_2O[/tex]

where, 'x', 'y'  are the subscripts of Carbon, hydrogen

We are given:

Mass of [tex]CO_2[/tex] = 12.74 g

Mass of [tex]H_2O[/tex]= 3.913 g

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 12.74 g of carbon dioxide, =[tex]\frac{12}{44}\times 12.74=3.474g[/tex] of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 3.913 g of water, =[tex]\frac{2}{18}\times 3.913=0.435g[/tex] of hydrogen will be contained.  

Mass of C = 3.474 g

Mass of H = 0.435 g

Step 1 : convert given masses into moles.

Moles of C =[tex] \frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{3.474g}{12g/mole}=0.289moles[/tex]

Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.435g}{1g/mole}=0.435moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =[tex]\frac{0.289}{0.289}=1[/tex]

For H =[tex]\frac{0.435}{0.289}=1.5[/tex]

The ratio of C : H = 1: 1.5

The whole number ratio will be = 2: 3

Hence the empirical formula is [tex]C_2H_3[/tex].

The empirical weight of [tex]C_2H_3[/tex] = 2(12.01)+3(1.008)= 27.04 g.

The molecular weight = 54.09 g/mole

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{54.09}{27.04}=2[/tex]

The molecular formula will be=[tex]2\times C_2H_3=C_4H_6[/tex]

Answer:

By walking and stuff, duh.

Explanation:

We walk, motion.

We drive, motion.

We eat, motion.

We talk, motion.