You estimate that you sent 135 texts last week but when you get the bill, it was actually 175. Calculate the percent error

Answer:

carbon group

All the carbon group atoms, having four valence electrons, form covalent bonds with nonmetal atoms; carbon and silicon cannot lose or gain electrons to form free ions, whereas germanium, tin, and lead do form metallic ions but only with two positive charges.

The set of elements that has 4 Valence electrons are the carbon group.

Valence electrons are those electrons that are found at the outermost shell of an element that can go into formation of chemical bonds with another element on a chemical reaction.

The group 14 elements in the periodic table are known to have a four Valence electron on their outermost shell.

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Answer:

activity coefficient [tex]\mathbf{\gamma =0.809}[/tex]

activity coefficient [tex]\mathbf{\gamma = 0.791}[/tex]

The change in pH in part A = 0.092

The change in pH in part B =  0.102

Explanation:

From the given information:

pH of HCl solution = 1.092

Activity of the pH solution [a] = [tex]10^{-1.092}[/tex]

[a] = 0.0809 M

Recall that [a] = [tex]\gamma[/tex] × C

where;

[tex]\gamma[/tex]  = activity coefficient

C = concentration

Making the activity coefficient the subject of the formula, we have:

[tex]\gamma = \dfrac{[a]}{C}[/tex]

[tex]\gamma = \dfrac{0.0809 \ M}{0.100 \ M}[/tex]

[tex]\mathbf{\gamma =0.809}[/tex]

B.

The pH of a solution of HCl and KCl = 2.102

[a] = [tex]10^{-2.102}[/tex]

[a] = 0.00791 M

activity coefficient [tex]\gamma = \dfrac{0.00791 \ M}{0.01 \ M}[/tex]

[tex]\mathbf{\gamma = 0.791}[/tex]

C. The change in pH in part A = 1.091 - 1.0 = 0.092

The change in pH in part B = 2.102 -2.00 = 0.102

Answer:

(a) 3.33 mol Bi

(b) 140. g CO

Explanation:

Step 1: Convert 775g to moles

Bi Molar Mass - 208.98 g/mol × 2 = 417.98 g/mol

O Molar Mass - 16.00 g/mol × 3 = 48.00 g/mol

775g Bi₂O₃ ÷ 465.98 g/mol = 1.66316 mol Bi₂O₃

Step 2: Find the conversion from Bi₂O₃ to Bi

1 mole of Bi₂O₃ equals 2 moles of Bi

Step 3: Use Dimensional Analysis

1.66316 mol  ·  [tex]\frac{2 \hspace{2} mol \hspace{2} Bi}{1 \hspace{2} mol \hspace{2} Bi_2O_3}[/tex] = 3.32632 mol Bi

3.32632 mol Bi ≈ 3.33 mol Bi (3 significant figures)

Step 4: Find the conversion from Bi₂O₃ to CO

1 mole of Bi₂O₃ equals 3 moles of CO

Step 5: Use Dimensional Analysis

1.66316 mol  · [tex]\frac{3 \hspace{2} mol \hspace{2} CO}{1 \hspace{2} mol \hspace{2} Bi_2O_3}[/tex] = 4.98948 mol CO

Step 6: Find molar mass of CO and convert moles to grams

C - 12.01 g/mol

O - 16.00 g/mol

4.98948 mol CO · 28.01 g/mol = 139.775 g CO

139.775 g CO ≈ 140. g CO (3 significant figures)

Answer:

C. The particles in a gas are spread farther apart than the particles in a solid

Explanation:

Solids are made up of tightly-packed particles that form a rigid shape. Liquids are comprised of loosely connected particles that can slightly move. Gases are made up of fast-moving disconnected particles that are spread far apart.

Answer:

ability to rust

Explanation:

i'm like 90% sure thats correct

Answer:

You need the mass of Mg and Ca in the sample and their molar masses

Explanation:

Its the only answer that made sense because using those 4, can give you their ration

The Columns in the table that provides the information necessary for the calculating the mole ratio of Ca to Mg are columns ; 3, 4, 6, and 7

Although some data related to your question is missing attached below is the missing data

Determining the mole ratio of Ca to Mg

           Ca         :        Mg

mass of Ca / molar mass  :  mass of Mg / Molar mass

( 36.1 / 40.1 )  :  ( 2.4 / 24.3 )

9.14  : 1

∴ The mole ratio of Mg to Ca

≈  1 : 9

Where: Column 3 = Mass of Mg in the sample ( g )

            Column 4 = mass of Ca in the sample  ( g )

             Column 6 = Molar mass of Mg ( g/mol )

             Column 7 = molar mass of Ca ( g/mol )

Hence the Mole ratio of Mg to Ca = 1 : 9

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Answer:

+2.

Explanation:

Hello,

In this case, since chromium has six valence electrons in its outer shell, when it loses four electrons it remains with two of them, therefore it charge as chromium ion is +2, so it is written as Cr⁺² and named as chormium (II) or hypochromous ion.

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Answer:

[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]

Explanation:

Hello,

In this case, since the equilibrium dissociation of zinc phosphate is:

[tex]Zn_3(PO_4)_2(s)\rightleftharpoons 3Zn^{2+}(aq)+2(PO_4)^{3-}(aq)[/tex]

Due to the fact that only the zinc and phosphate ions are in aqueous state, the solubility product expression is written considering the law of mass action in which the concentration of each species is powered to the corresponding stoichiometric coefficient as follows:

[tex]Ksp=[Zn^{2+}]^3[PO_4^{3-}]^2[/tex]

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Answer:

344.5764 torr

Explanation:

Molar mass of naphthalene = 128.2g/mol

Mass of naphthalene = 10.60 g

Carbon disulfide:

Molar mass= 76.14g/mol ;

volume = 155mL ;

density = 1.261 g/mL

Vapour pressure = 355.6 torr

Number of moles = mass / molar mass

CS2:

Mass = density × volume

Number of moles = (density × volume) / molar mass

Number of moles = (1.261 * 155) / 76.14 = (195.455 / 76.14) = 2.567 moles of CS2

Number of moles of C8H10:

Number of moles = 10.60 / 128.2 = 0.083 C8H10

Total number of moles :

2.567 + 0.083 = 2.65 moles

Mole fraction of each compound in solution :

CS2 :

2.567 / 2.65 = 0.969

C8H10:

0.083 / 2.65 = 0.031

According to Raoult's:

Psolution = Xsolvent × Posolvent

CS2 = solvent

Xsolvent = Mole fraction of solvent

Posolvent = Vapour pressure of pure solvent

Psolution = 0.969 × 355.6 torr = 344.5764 torr

The vapor pressure of the solution would be as follows:

[tex]344.5764[/tex] torr

Given that,

Vapor pressure of Carbon Disulfide [tex]= 355.6[/tex] torr

[tex]volume = 155mL ;[/tex]

[tex]density = 1.261 g/mL[/tex]

Naphthalene's mass [tex]= 10.60 g[/tex]

Naphthalene's molar mass [tex]= 128.2g/mol[/tex]

Now,

We know that

Number of moles [tex]= mass/molar mass[/tex]

Mass [tex]= density[/tex] × [tex]volume[/tex]

[tex]Number of moles =[/tex] [tex](density[/tex] × [tex]volume) / molar mass[/tex]

So,

Number of moles of Carbon Disulfide [tex]= (1.261[/tex] × [tex]155) / 76.14[/tex]

[tex]= (195.455 / 76.14)[/tex]

[tex]= 2.567[/tex] moles of Carbon Disulfide

Number of moles of Naphthalene:

Number of moles [tex]= 10.60 / 128.2[/tex]

[tex]= 0.083[/tex]

Now,

Total number of moles :

[tex]2.567 + 0.083[/tex]

[tex]= 2.65[/tex] moles

Mole fraction of each compound in solution :

Carbon Disulfide:

2.567 / 2.65

[tex]= 0.969[/tex]

Naphthalene

0.083 / 2.65

[tex]= 0.031[/tex]

According to Raoult's:

P[tex]solution = Xsolvent[/tex] × [tex]Posolvent[/tex]

Carbon Sulfide = Solvent

[tex]Xsolvent =[/tex] Mole fraction of solvent

[tex]Posolvent =[/tex] Vapour  pressure of the pure solvent

[tex]Psolution[/tex] [tex]= 0.969[/tex] × [tex]355.6 torr[/tex]

[tex]= 344.5764[/tex] torr

Thus, "[tex]344.5764[/tex] torr" is the correct answer.

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Answer:

[tex]V=0.200L[/tex]

Explanation:

Hello,

In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:

[tex]V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L[/tex]

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Answer:

Explanation:

An acid is a substance that, when dissolved in water produces hydrogen ions, H⁺ as the only positive ion. e.g.

HCl       ↔    H⁺   +   Cl⁻

HNO₃    ↔   H⁺   +  NO⁻₃

This process is known as ionization. The characteristics properties of an acid in solution are due to the presence of these hydrogen ions. In these reactions, the negative ions formed or sometimes the neutral compounds are usually known as the conjugate base of such acid.

From the given information, the conjugate base of the acid given can be seen in the attached image below.

The conjugate base for the acid is attached below.

An acid is a substance that, when dissolved in water produces hydrogen ions, H⁺ as the only positive ion. e.g.

HCl       ↔    H⁺   +   Cl⁻

HNO₃    ↔   H⁺   +  NO⁻₃

This process is known as ionization. The characteristics properties of an acid in solution are due to the presence of these hydrogen ions. In these reactions, the negative ions formed or sometimes the neutral compounds are usually known as the conjugate base of such acid.

The conjugate base of the acid given can be seen in the attached image below.

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Answer:

9^3 i think so like 279

Explanation:

blah

Answer:

In order of increasing frequency and decreasing wavelength these are: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays........... ᕕ( ᐛ )ᕗ

..

Answer: Single Covalent Bonds

Hydrogen and chlorine coming together is an example of a single covalent bond. Two hydrogen atoms will also come together to form a single covalent bond, as will two chlorine atoms. In these examples, each individual atom has just one unpaired electron to share with the other atom.

A Little Backstory I Guess: In chemistry, a single bond is a chemical bond between two atoms involving two valence electrons. That is, the atoms share one pair of electrons where the bond forms. Therefore, a single bond is a type of covalent bond.

sorry its so long :/ hope this even relatively helps...

Answer: biotic is Living things in their ecological relations.

Explanation:

Answer:

They have three to six valence electrons, so they can lose or gain electrons.

Explanation:

Here, we are required to identify how the number of Valence electrons on atoms of metalloids explain why metalloids are semiconductors.

Metalloids are elements in the periodic table which are characterized by the the presence of 3 to 6 Valence electrons.

Ultimately, the presence of three to six Valence electrons and the ability to either lose or gain electrons is the criteria for their semiconductor character.

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Answer:

See the answer

1) 15.0 g of water is heated from 5 °C up to 37 °C. How much energy is absorbed by the water? (The specific heat of liquid water is 4.184 J/g°C.)

2)How many joules of energy is required to bring a five-pound (1 pound = 454 g) bag of ice from its freezer temperature at -20.0°C up to 0°C? The specific heat of ice is 2.10 J/g×°C.

3) A 50.0 mg tissue sample is taken from a patient for diagnosis. While waiting for testing, the sample is stored in a -80.0°C freezer. How much energy is released when the sample is cooled from 20.0°C down to the freezer temperature? You may assume the specific heat of the tissue sample is 3.47 J/g×K.

Answer:

Specific heat is the amount of heat energy required to raise the temperature of substance by, the units for specific heat is, each element have particular fixed specific heat.

The heat energy change can be obtained by the formula



Temperature change can be represented by 



If we know the specific heat of substance then we can easily calculate the heat energy change of the substance

Answer:

Mass of the salt:  105.6g of KCl.

Mass water: 958.9g of water.

Molality: 1.478m.

Explanation:

Mass of the salt:

In 1L, there are 1.417 moles. In grams:

1.417 moles KCl * (74.54g / mol) = 105.6g of KCl

Mass of the water:

We can determine the mass of solution (Mass of water + mass KCl) by multiplication of the voluome (1L and density 1064.5g/L), thus:

1L * (1064.5g / L) = 1064.5g - Mass solution.

Mass water = 1064.5g - 105.6g = 958.9g of water

Molality:

Moles KCl = 1.417 moles KCl.

kg Water = 958.9g = 0.9589kg.

Molality = 1.417mol / 0.9589kg = 1.478m

Answer:

No matter where that object is in the vast universe, it will have the same mass. Weight, on the other hand, is a measure of how much gravitational force is exerted on an object.

Answer: yall trust me on this one, i took one for the team. The answer is "C" or you can say 31 percent. boys get me 50 thanks.

Explanation:

The percentage of sunlight that hits the Earth's surface directly is 31 percent. The correct option is C.

Sunlight is the electromagnetic radiation transferred by the sun.

The sun is 93 million away from the earth, so it takes eight and half minutes to reach the sunlight to the earth.

Only 30 to 34 percent of light reaches the earth, and the remaining lights are reflected back by clouds and the earth itself.

Thus, the correct option is C, 31 percent.

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Answer:

well ,if I have done my sum rights there are

14 atom in the one formula unit of aluminium carbonate.

Answer:

14 atoms

Explanation:

Answer:

They are more spread out.

Explanation:

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Answer:

Explanation:

Explanation:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles

Answer:

The correct answer is "inferior".

Explanation:

In anatomy, the term inferior is used to describe parts of the body that are below other part used as reference. Inferior comes from the Latin "inferus" that means "below". In this case, the mouth will always be inferior to the nose, it doesn't matter if the boy was standing on his head or if he is in other position.

Answer:

correct answer, inferior.

Explanation:

of little or less importance, value, or merit always felt inferior to his older brother. 2a : of low or lower degree or rank. b : of poor quality : mediocre. 3 : situated lower down : lower.

If one person is regarded as inferior to another, they are regarded as less important because they have less status or ability. He preferred the company of those who were intellectually inferior to himself.

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Answer:

we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf

Explanation:

when we run a TLC plate in a 50/50 mixture of hexanes and ethyl acetate we will except an increase in the polarity of the system and this will cause the Non-polar spot to be near the solvent front, while the polar spot will run at an approximate speed of 0.5 Rf

The speed of the polar spot depends largely on the level of polarity, an increase in the polarity will see both spots of Neat hexane run when we run a TLC  plate in a 50/50 mixture of hexanes and ethyl acetate

Answer:

a. The balanced chemical equation is written below and this is a type of double displacement reaction.

Explanation:

When barium chloride reacts with copper sulfate, a white precipitate of barium sulfate is observed.

The chemical equation for the reaction of barium chloride and copper sulfate follows:

b.

2FeSO4--(heat)---> Fe2O3 + SO2+ SO3

This Reaction is an example of Thermal Decomposition Reaction.

Answer:

The answer is D. In the reactions A,B and C the reactants undergo changes in oxidation number. And also the reaction D is an acid_base neutralization reaction.

Answer:

iconic compounds is your anwser

Answer:

Iconic Compounds

Explanation:

I watched a video about it.

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