In a laboratory experiment, a chemist prepared different concentrations of solution with a light absorbing solute and measured the absorbance of each solution. In the absorbance measurements, the solutions were placed in sample holders where light propagates through 5.00 cm of sample. So, the length, I, equals 5.00 cm in all these measurements. The following data is collected:
Concentration: 0, Absorbance : 0: Concentration: 0,102; Abs: 0,0089
Concentration : 0.249 Abs: 0.0205
Concentration: 0.502 Abs: 0.0463
Concentration: 0.748 Abs: 0.0641
Concentration: 1.052 Abs: 0.0903
Concentration: 1.485 Abs: 0.1335
a- Which variable is the independent variable?
b- Which variable is the dependent variable?
c- Using Excel, make a plot of the data with the appropriate variables as x and y. Using the linear regression analysis of the plotting program, determine the best-fit slope and y-intercept of the data. Be sure to include units!

Answer:

zygote

Explanation:

In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.

Answer:

zygote

Explanation:

In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.

Answer:

Solids have a defined shape and volume.

Liquids have a definite volume but can take the shape of a container.

Gas has no definite volume or shape.

Answer:

See Explanation for more details...

Explanation:

Solid: defined form, minimal potential energy, it is not compressible, defined mass.

Liquid: No defined form, has more potential energy than the solids, it is not compressible, defined mass.

Gas: No defined form, high potential energy, it is compressible, defined mass.

Answer:

Explanation:

Percent composition of sodium chloride .

NaCl

Mol weight = 23 + 35.5 = 58.5 g

58.5 g of NaCl contains 23 g of Na

100 g of NaCl contains 23 x 100 / 58.5 g of Na

= 39.3 %

Na = 39.3 %

58.5 g of NaCl contains 35.5  g of Cl

100 g of NaCl contains 35.5 x 100 / 58.5 g of Na

= 60.7 %

Cl = 60.7 % .

Answer:

or reactions that are not at equilibrium, we can write a similar expression called the reaction quotient QQQ, which is equal to K_\text cK

c

​

K, start subscript, start text, c, end text, end subscript at equilibrium.

Explanation:

Answer:

B) The family car

Explanation:

I hope this helps :)

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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alimientos procesados:

cereales, queso ,verduras enlatadas, un pan bocadillos salados, como patatas fritas, panecillos de salchicha, tartas y empanadas productos cárnicos, como tocino, salchicha, jamón, salami y paté comidas para microondas o comidas preparadas pasteles y galletas bebidas, como leche o refrescos

alimientos naturales

1. Pescado · 2. Brócoli o cualquiera de las verduras crucíferas · 3. Remolacha · 4. Espinacas y otras verduras de hoja verde · 5. Col rizada · 6. Mantequilla de maní · 7. Almendras.pechugas de pollo, Cordero, Salmón, Camarón,Aceite de coco,Nueces y semillas

Answer:

what

Explanation:

Answer:

expressed in moles

a)0.1 moles

b)2.99 moles

c)0.5 moles

molarmass of the substances

a)26g/mol

b)14g/mol

c)17g/mol

Explanation:

remember

1mole=6.02×10^23molecules

The expressions in moles are:

The molar masses of the substances are:

In more detail, the number of particles in a substance can be expressed in terms of moles. A mole is defined as the number of particles in a substance that contains Avogadro's number of particles, which is 6.02 x 10²³. To convert the number of particles in a substance to moles, we divide the number of particles by Avogadro's number.

The molar mass of a substance is the mass of one mole of the substance, expressed in grams. The molar mass of a substance can be calculated by summing up the atomic masses of all the atoms in the substance.

A) 6.02 x 10²² C₂H₂ molecules:

1 mole = 6.02 x 10²² particles

0.1 moles = (6.02 x 10²² particles) / (6.02 x 10²³ particles/mole) = 6.02 x 10²² particles / 6.02 x 10²³ particles/mole = 1 mole / 6.02 x 10²³ = 0.1 moles

B) 1.80 x 10¯¹⁰²⁴ nitrogen atoms:

1 mole = 6.02 x 10²³ particles

2.99 moles = 1.80 x 10¯¹⁰²⁴ particles / (6.02 x 10²³ particles/mole) = 1.80 x 10¯¹⁰²⁴ particles / 6.02 x 10²³ particles/mole = 2.99 moles

c) 3.01 x 10²³ NH3 molecules

1 mole = 6.02 x 10²³ particles

0.5 moles = 3.01 x 10²³ particles / (6.02 x 10²³ particles/mole) = 3.01 x 10²³ particles / 6.02 x 10²³ particles/mole = 0.5 moles

The molar mass of C₂H₂ is calculated by summing up the atomic masses of carbon (12 g/mol) and hydrogen (1 g/mol) in the molecule.

The molar mass of nitrogen is calculated based on the atomic mass of nitrogen (14 g/mol).

The molar mass of NH3 is calculated by summing up the atomic masses of nitrogen (14 g/mol), and hydrogen (1 g/mol) in the molecule.

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CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen.

Intermolecular forces determine bulk properties, such as the melting points of solids and the boiling points of liquids.

Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid.

CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen. The polarity increases the boiling point of the molecule.

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Answer:

648.68 mg

Explanation:

The reaction that takes place is:

First we calculate how many moles of each reactant were added, using the given volumes and concentrations:

24 mmol of FeCl₃ would react completely with (24 * 3) 72 mmol of NaOH. There are not as many NaOH mmoles, so NaOH is the limiting reactant.

Now we calculate how many moles of Fe(OH)₃ are formed, using the moles of the limiting reactant:

Finally we convert 6.07 mmol Fe(OH)₃ to grams, using its molar mass:

The 129.6 g mass of Fe(OH)₃ will be obtained.

Weight or mass of any substance can be calculated from mole as:

n = W/M.

Given chemical reaction is:

FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl

According to the question:

Concentration of FeCl₃ = 0.240 M

Volume of FeCl₃ = 100 mL

Concentration of NaOH = 0.182 M

Volume of NaOH = 200 mL

Moles can be calculated by using the formula M = n/V mole/L 0r M = n×1000/V g/mL,

Moles of FeCl₃ = 0.240 × 100 = 0.024 mole

Moles of NaOH = 0.182 × 200 = 3.64 mole

From the stoichiometry of the reaction, it is clear that 3 mole of NaOH i.e. 109.2 moles of NaOH reacts with 1 mole of FeCl₃ to form product. So here NaOH is the limiting agent and responsible for the formation of product. Now we calculate how many moles of Fe(OH)₃ are formed, using the moles of the limiting reactant as follow:

Moles of Fe(OH)₃ = 1/3 × ( 3.64) = 1.21 mole

Finally we convert 12.1 mole Fe(OH)₃ to grams, using its molar mass:

W = 1.21 mole × 106.87 g/mole = 129.6 g

Hence, 129.6 gram of Fe(OH)₃ will be obtained.

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Answer:

True

Explanation:

Table sugar and table salt are pure substances....When elements chemically combine, they form compounds that have properties that are similar to those of the uncombined elements.

Answer:

C) only potential energy.

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

For this section:

(d) To determine which acid would be completely dissociated when dissolved in water, consider the strength of the acid and its ability to ionize completely. Strong acids are those that ionize completely in water, while weak acids only partially dissociate.

Among the given options:

(H O)₂SO is sulfuric acid (H₂SO₄), which is a strong acid and completely dissociates in water.

(H O)IO₃ is iodic acid (HIO₃), which is also a strong acid and completely dissociates in water.

(H O)₂SO₂ is not a known acid and cannot be evaluated for dissociation.

HCO₂H is formic acid (HCOOH), which is a weak acid and only partially dissociates in water.

Therefore, the acids that would be completely dissociated when dissolved in water are (H O)₂SO and (H O)IO₃.

(e) To estimate the pH of the given solutions formed by titration, compare the moles of the acid and base used in the reaction.

(i) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous HCl, the reaction between a strong acid (HCl) and a strong base (NaOH) forms a neutral salt (NaCl) and water. The resulting solution would have a pH of 7, indicating neutrality.

(ii) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous acetic acid, consider the ionization of acetic acid and the formation of its conjugate base. The pKa of acetic acid is given as 4.76.

Since the volumes and concentrations of the acid and base are equal, we have a 1:1 mole ratio between them. This means that half of the acetic acid will be neutralized, and the remaining half will be in the form of the conjugate base (acetate ion, CH₃COO-). The resulting solution will be a buffer solution with a pH close to the pKa of acetic acid, which is 4.76.

(f) To predict the products formed from mixing the given reagents, we need to consider the reactions and the possible chemical reactions that occur.

(i) 3I₂ + PBr₃: This reaction involves the combination of iodine (I₂) with phosphorus tribromide (PBr₃). The balanced equation is:

3I₂ + 2PBr₃ → 6IBr + P₂

(ii) 4LiH + GaCl₃: This reaction involves the combination of lithium hydride (LiH) with gallium trichloride (GaCl₃). The balanced equation is:

4LiH + GaCl₃ → 4LiCl + GaH₃

(iii) NH₃ + BCl₃: This reaction involves the combination of ammonia (NH₃) with boron trichloride (BCl₃). The balanced equation is:

NH₃ + BCl₃ → NH₃BCl₃

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Answer:base

Explanation:

base

A solution with a pH of 8 is basic in nature.

pH is defined as the negative logarithm of H⁺ ion concentration.

pH is a measure of how acidic or basic a substance is. In our everyday routine, we encounter and drink many liquids with different pH. Water is a neutral substance. Soda and coffee are often acidic.

The pH is an important property, since it affects how substances interact with one another and with our bodies. In our lakes and oceans, pH determines what creatures are able to survive in the water.

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Answer:

m=dxv

= 10.5 x 965 = 10132.5 rounded off to 10100 g

Explanation:

Answer:

For completely converting 6.34 moles of hydrogen to ammonia, 2.11 moles of Nitrogen is required.

The chemical reaction for the formation of ammonia by nitrogen and hydrogen reaction has been as follows:

For the formation of 2 moles of ammonia, 3 moles of hydrogen, and 1 mole of nitrogen s required.

The utilization of 3 moles of hydrogen requires 1 mole of Nitrogen.

So, the utilization of 6.34 moles of hydrogen requires:

3 moles Hydrogen = 1 -mole Nitrogen

6.34 moles hydrogen =  moles of Nitrogen

6.34 moles of hydrogen requires = 2.11 moles of Nitrogen.

For completely converting 6.34 moles of hydrogen to ammonia, 2.11 moles of Nitrogen is required.

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rating answer section

Answer rating5.0

(20 votes)

The container will expand to 4.0 L when it holds 2.4 moles of the same gas.

To answer your question, we will use the concept of Avogadro's law, which states that the volume of a gas is directly proportional to the number of moles (n) of the gas when the temperature and pressure remain constant.

Mathematically, it can be represented as:
V1/n1 = V2/n2

where,

V1 and n1 = initial volume and moles of the gas

V2 and n2 = final volume and moles of the gas

Given the initial conditions,

V1 = 3.0 L

n1 = 1.8 moles

The final condition,

n2 = 2.4 moles.

To find V2, Using the given values and rearranging the formula, we have:

V2 = V1 * (n2/n1)

V2 = 3.0 L * (2.4 moles / 1.8 moles)

V2 = 3.0 L * (1.3333)

V2 = 4.0 L

So, when the container holds 2.4 moles of the same gas, it will expand to a volume of 4.0 L. This is because the number of moles of the gas has increased, and according to Avogadro's law, the volume must also increase proportionally to maintain a constant temperature and pressure.

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Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate.  After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings.  Unwilling to challenge the data openly, they erased the report from public view without a word to the authors.  When the authors inquired, they received this letter:

Explanation:

i do not own my copyrights

If you add 25 g of CaCl2 to 1000. mL of water, what concentration of the solution would be 0. 225 grams/liter

Molarity or molar concentration(M) is defined as the  amount of a substance in a given volume of solution.

It is also known as the moles of a solute in a liter of  the solution.

Formula:

Concentration or molarity = number of moles ÷ volume

The number of moles is derived thus;

Number of moles = mass ÷ molar mass

mass of CaCl2 = 25g and molar mass = 110. 98 g/mol

Number of moles = 25 ÷ 110. 98 = 0. 225 mol

Given the volume = 1000 ml = 1 liter

Concentration = 0.225 ÷ 1 = 0. 225 grams/liter

Therefore, If you add 25 g of CaCl2 to 1000. mL of water, the concentration of the solution would be 0. 225 grams/liter

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The concentration of the methylamine chloride is 0.0000013 M.

We know that the concentration has to do with the amount of the substance that is present. Hence, the question is essentially trying to ask us to be able to find the  the concentration of methylamine chloride in the solution.

[H^+] = Antilog(-0.20) = 0.63 M

Ka = 1 * 10^-14/4.6*10^-4 = 2.22 * 10^-11

Let us first set up the ICE table as shown below;

            CH3NH2(aq)    +  H^+  ⇄  CH3NH3^+(aq)   + OH^-(aq)

I               0.15                   0.63         0                         0                      

C              -x                      -x              +x                        +x

E         0.15 - x                0.63 -x        x                          x

Ka = [CH3NH3^+] [OH^-]/[CH3NH2] [H^+]

2.22 * 10^-11= x^2/[0.15 - x] [0.63 -x ]

2.22 * 10^-11(0.09 -0.15x - 0.63x + x^2) = x^2

2.22 * 10^-11(0.09 - 0.48x +x^2) = x^2

1.9 * 10^-12 - 1.1 * 10^-11x + 2.22 * 10^-11x^2 = x^2

x^2 - 2.22 * 10^-11x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x =0.0000013 M

Concentration of the methylamine chloride = 0.0000013 M

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Answer:

j.j. thomasons experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons .

Explanation:

Thomson’s experiment with the cathode ray tube (CRT) was used to support the discovery of electron or the negatively charged subatomic particle.

William Thomson put forth the Thomson atomic model in 1900. J.J. In a cathode ray tube experiment, Thomson discovered a negatively charged particle. In 1897, this experiment was conducted. A vacuum tube is known as a cathode ray tube. The electron was the name given to the negative particle.

Hence, according to Thomson’s model of an atom, atoms are electrically neutral and an atom contains negatively charged particles known as electrons.

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Answer:

13.3 L

Explanation:

Step 1: Given data

Step 2: Convert P₁ to atm

We will use the conversion factor 1 atm = 1.01325 bar.

3.36 bar × (1 atm / 1.01325 bar) = 3.32 atm

Step 3: Calculate V₂

We will use the combined gas law.

P₁ × V₁/T₁ = P₂ × V₂/T₂

V₂ = P₁ × V₁ × T₂/T₁ × P₂

V₂ = 3.32 atm × 15.0 L × 350 K/298 K × 4.40 atm

V₂ = 13.3 L

Exactly 149.6J will raise the temperature of 10.0g of a metal from 25.0C. The specific heat capacity of the metal is 5.984 J/g°C.

The heat capacity of a sample of a substance divided by the mass of the sample yields the specific heat capacity (symbol c), also known as massic heat capacity. Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit. The specific heat capacity unit in the SI is the joule per kelvin per kilogram, or Jkg⁻¹K⁻¹. For instance, the specific heat capacity of water is 4184 J kg⁻¹K⁻¹, or the amount of energy needed to raise 1 kilogram of water by 1 K.

The specific heat capacity of the metal can be calculated using the equation Q = m × c ×ΔT.

Q = 149.6J

m = 10.0g

ΔT = (final Temperature - initial Temperature) = (25°C - 0°C) = 25°C

Plugging these values into the equation, we get:

149.6J = 10.0g × c ×25°C

Solving for c, we get:

c =  \(\frac{149.6J}{(10.0g *25C)}\)

c = 5.984 J/g°C

Therefore, the specific heat capacity of the metal is 5.984 J/g°C.

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Explanation:

Calculation:

The pH of a solution is calculated by the formula:

p

H

=

−

log

[

H

+

]

Now the dissociation reaction of HCl is:

(

0.1

M

)

H

C

l

→

(

0.1

M

)

H

+

+

(

0.1

M

)

C

l

−

Here one mole of HCl gives one mole of hydrogen ions. Therefore, the concentration of

H

+

ion is the same as the concentration of HCl, given that is 0.1 M.

Now substitute this value in the formula:

p

H

=

−

log

[

H

+

]

=

−

log

(

0.1

)

=

1

The angles as shown are supplementary angles because the add up to 180 degrees.

Two angles are said to be supplementary if they add up to 180 degrees. Now we know that the sum of angles on  straight line is 180 degrees. If we look at the image as shown in the image attached, we can see that the angles lie on a straight line.

As such, we can conclude that the angles as shown are supplementary angles because the add up to 180 degrees.

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Answer:

\(P_{CCl_4}=52.43torr\)

Explanation:

Hello there!

In this case, sine the solution of this problem require the application of the Raoult's law, assuming heptane is a nonvolatile solute, so we can write:

\(P_{CCl_4}=x_{CCl_4}P_{CCl_4}^{vap}\)

Thus, we first calculate the mole fraction of chloroform, by using the given masses and molar masses as shown below:

\(x_{CCl_4}=\frac{140/153.81}{140/153.81+67.1/100.21}=0.576\)

Therefore, the partial pressure of chloroform turns out to be:

\(P_{CCl_4}=0.576*91torr\\\\P_{CCl_4}=52.43torr\)

Regards!

To find the density of the unknown piece of metal, we can use the formula:

Density = mass / volume.

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This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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