6. what is done with the reactive sodium after the reaction to ensure the products are safe in a car airbag

The concentration of  Fe³⁺ in Jordan Lake is = 8.09 × 10⁻⁵ M  

The Beer-Lambert Law, also known as Beer's Law, Lambert-Beer Law, or Beer-Lambert-Bouguer Law, relates the attenuation of light to the properties of the material through which the light passes.

According to Lambert-Beer's law, the absorbance of a sample is directly proportional to its concentration.

The reaction that produces a red complex

Fe³⁺ + KScN ⇒ Fe ( SCN )₃  ( red complex )

Concentration of  Fe³⁺ in  reference sample

= 4.80x10⁻⁴ × ( 5.0 / 50.0 ) = 4.80 × 10⁻⁵M  

Reference sample was diluted from 5.0 mL to 50.0 mL

Concentration of 4.80 × 10⁻⁵M  has an absorbance = 0.512

Given that Lake sample absorbance is 0.345

Concentration of lake sample :

= absorbance of lake sample × ( conc of reference sample / absorbance )

= 0.345 × (4.80* 10⁻⁵ / 0.512)  = 3.23 × 10⁻⁵M.

Concentration of Fe³⁺ in Jordan  lake

=  3.23 × 10⁻⁵ × ( 50.0mL / 20.0mL) = 8.09 × 10⁻⁵ M  

Solution was diluted from 20.0 mL to 50.0 mL

Hence we can conclude that The concentration of  Fe³⁺ in Jordan Lake is = 8.09 × 10⁻⁵ M.

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Answer:

The answer is B, a value or characteristic that can take different values

Explanation:

ex.) 1s + 3

s is the variable

Variables are the varying or unchangeable data or factors in an experimental design. It can be defined as a characteristic that can have different values. Thus, option B is correct.

Variables are experimental characteristics that may be consistent or can be changeable. In an experimental design, the variables are used to analyze the cause and effect.

The variables of an experiment can be dependent, independent, or controlled. The varying factors in an experiment to analyze are called independent variables.

The factors that depend and respond to the effect of the independent variables are called dependent variables. These all values are contrasted to the control group with a fixed value.

Therefore, in option B, the variables are the characteristics with the same or different values.

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Answer:

boron

Explanation:

boron is a metaloid meaning it has the property of a metal and a non metal located where metals and non metals meet on the periodic table

Answer:

The answer is boron, the second answer is chlorine

Explanation:

edge 2022, have a great day h0mies

Answer:

1.213 g/mol

Explanation:

We are given that the molecular mass is 7.304 × 10²³ g.

From avogadro's number, we know that;

1 mole of a substance = 6.022 × 10²³ molecules

Thus;

Molar mass = molecular mass/avogadro's number = (7.304 × 10²³)/(6.022 × 10²³) = 1.213 g/mol

As per the given question, the energy of the gas at the end of the process is 6596.68 J.

The given conditions are as follows:

Number of moles of the gas, n = 2.08

Ideal gas constant, R = 8.31 J/K-mol

Initial pressure of the gas, P1 = 9.048 bars Initial temperature of the gas,

T1 = 308.3 K The initial state of the gas is heated at a constant volume, so the volume of the gas remains constant during this process. Therefore, V1 = V2, where V1 is the initial volume of the gas and V2 is the final volume of the gas.At a constant volume, the gas equation can be given as:

P1V1 = nRT1

Thus, V1 = nRT1/P1

= 2.08 × 8.31 × 308.3 / 9.048

= 469.4 L

At constant volume, when the pressure of the gas doubles, the final pressure becomes:

P2 = 2 × P1

= 2 × 9.048

= 18.096 bars

For isothermal expansion of the gas at a constant pressure of 1.5000 bars until it reaches mechanical equilibrium, the final volume of the gas is given by the equation:

V3 = nRT3/P3

where T3 is the final temperature of the gas and P3 is the final pressure of the gas.The isothermal process is carried out such that the temperature of the gas remains constant.

Therefore,T1 = T3Thus, V3 = V2 (P2/P3)

= 469.4 (18.096/1.5)

= 5626.40 L

The work done by the gas in the isothermal expansion can be calculated as follows:

W = nRT ln (P2/P3)

= 2.08 × 8.31 × ln (18.096/1.5)

= 6596.68 J

The total change in internal energy of the gas can be calculated as: ΔU = Q - W WHere, Q is the heat supplied to the gas. The isothermal process is carried out such that the temperature of the gas remains constant. Therefore,ΔU = 0 (as there is no change in temperature)Thus, Q = W = 6596.68 J

Therefore, the energy of the gas at the end of the process is 6596.68 J.

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Explanation:

when one reactants is in excess, there will always be some left over. The other reactants becomes limiting factor and controls show much of each product is produced.while using excess percentage yields this is at the expense of atom economy.

Answer:

compiound

Explanation:

Answer:

Water is a compound of hydrogen and oxygen.

Explanation:

Answer:

Explanation:

The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.

Answer:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].

Example: Find the pH of a 0.0025 M HCl solution.

Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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Answer:

The Ideal gas law

Explanation:

From the given question, we have:

V \(\alpha\) \(\frac{nT}{P}\)

where each variable has its usual meaning.

Thus,

V = \(\frac{nRT}{P}\)

where R is the ideal gas constant

cross multiply to have;

PV = nRT

This implies that the volume of the gas is directly proportional to the number of moles of the gas.

Therefore, the law can be used to determine the relationship between the volume and number of moles is the ideal gas law.

Suppose a vessel contains HI at a concentration of 0.32 M. The concentration of HI in the vessel 0.88 seconds later is 0.175 M.

Initial concentration of HI = 0.32 M

Time = 0.88 s

Rate is given as 0.684 s⁻¹

The concentration of HI in the vessel 0.88 seconds later. It can be expressed as :

ln (HI) = ln (HI)₀ - (kt)

Where;

(HI)₀ is the initial concentration

k is the reaction rate constant

t is time

Now, we have;

ln (HI) = In (0.32) - (0.684 × 0.88)

ln (HI) = -1.1394 - 0.6019

ln (HI) = -1.7413

(HI) = e^(-1.7413)

(HI) = 0.175 M

Thus, the concentration of HI is 0.175 M.

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This question is incomplete the complete question is :

Consider this reaction: 2 HI(g) ⇄ H₂(g) + I₂(g)

At a certain temperature, this reaction follows first - order kinetics with a rate constant of 0.684 s^(-1). Suppose a vessel contains HI at a concentration of 0.32 M. Calculate the concentration of HI in the vessel 0.88 seconds later. you may assume no other reaction is important. round your answer to significant digits.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 2.34 g

density = 4.78 g/mL

We have

\(volume = \frac{2.34}{4.78} \\ = 0.4895397...\)

We have the final answer as

Hope this helps you

Column B consists of the meanings of these terms, such as pressure, Robert Boyle, litres, N/m2, Kelvin, etc.We have to match the terms in Column A with their corresponding meanings in Column B. Column A consists of terms related to physics, such as acceleration due to gravity, Boyle's Law, force, unit of mass, etc

To match these terms correctly, we need to have a good understanding of the concepts related to physics. For example, acceleration due to gravity is the force exerted by the Earth on any object that is within its gravitational field. This force is measured in meters per second squared (m/s2). On the other hand, Boyle's Law is a principle in physics that describes the relationship between the pressure and volume of a gas. It states that if the volume of a gas is reduced, its pressure will increase, and vice versa.

Similarly, other terms in Column A have their specific meanings in Column B. For instance, force is a physical quantity that is used to describe the interaction between objects, and it is measured in Newtons (N). Volume refers to the amount of space occupied by a substance, and it is measured in litres (L). Kelvin is the unit of measurement for temperature, which is a physical quantity that is used to describe the degree of hotness or coldness of an object.In conclusion, to match the terms in Column A with their corresponding meanings in Column B, we need to have a good understanding of the concepts related to physics. This requires us to study and understand the various laws and principles of physics, such as Boyle's Law, Newton's laws of motion, and so on.

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An insulated cup contains 75 g of water at 24 °C. A 26 g sample of metal at 82.25°C is added. The final temperature of the water and metal is 28.34°C. The specific heat of the metal is 0.972 J/ g°C.

Given that :

Mass of the metal = 26 g

The specific heat of the metal = ?

Initial temperature of the metal = 82.25°C

Equilibrium temperature = 28.34°C

Mass of the water = 75 g

Specific heat of water = 4.18 J/ g°C

Initial temperature of the water = 24 °C

The specific heat capacity is given as :

26 × c × ( 82.25 - 28.34) = 75 × 4.18 ( 28.34 - 24)

26 × c × 53.91 = 313.5  × 4.34

c = 0.972 J/ g°C

Thus, the specific heat capacity of metal is 0.972 J/ g°C.

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According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

The complete ionic equation for the reaction that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed is as follows: 2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 Li+(aq) + 2 NO3-(aq)

It is important to write the complete ionic equation when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed. The reaction of lithium sulfide with copper (II) nitrate is a double displacement reaction. Lithium sulfide reacts with copper (II) nitrate to form copper sulfide and lithium nitrate.

The balanced chemical equation for the reaction is given as follows:Li2S(aq) + Cu(NO3)2(aq) → CuS(s) + 2 LiNO3(aq)The complete ionic equation can be written by representing all the ions in the aqueous solutions as dissociated ions.

Thus, the complete ionic equation for the reaction that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed is as follows:2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 Li+(aq) + 2 NO3-(aq.

)In the above equation, the lithium and nitrate ions do not take part in the reaction and are present in the same form in the reactant and product side. Hence, they are called spectator ions.

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Therefore, the percent yield of the work is 78.2%.

Percent yield refers to the percentage of the actual yield obtained from a reaction as compared to the theoretical yield. It is calculated using the formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100

Given that 2.44 grams of silver was extracted from a solution prepared by dissolving 4.92 grams of silver nitrate (AgNO3).

To calculate the percent yield, we need to determine the theoretical yield.

The balanced chemical equation for the reaction between silver nitrate and silver is:

2 AgNO3(aq) + 2 Ag(s) → 4 AgNO3(aq)

The equation states that 2 moles of silver nitrate react with 2 moles of silver to produce 4 moles of silver nitrate.

From this equation, we can determine that the theoretical yield of silver is equivalent to the amount of silver nitrate used in the reaction (assuming that the reaction goes to completion).

The molar mass of AgNO3 is 169.87 g/mol.

We can use this to convert the mass of AgNO3 used in the reaction to moles:

moles of AgNO3 = mass / molar mass= 4.92 g / 169.87 g/mol= 0.02892 mol

Since two moles of AgNO3 produces two moles of Ag, then 0.02892 moles of AgNO3 will produce 0.02892 moles of Ag.

The molar mass of Ag is 107.87 g/mol.

We can use this to convert the moles of Ag to mass:

mass of Ag = moles of Ag x molar mass

mass of Ag = 0.02892 mol x 107.87 g/mol

mass of Ag = 3.12 g

Therefore, the theoretical yield of silver is 3.12 grams.

Using the formula for percent yield:

Percent Yield = (Actual Yield / Theoretical Yield) x 100

Substituting the given values:

Percent Yield = (2.44 g / 3.12 g) x 100Percent Yield = 78.2%

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The percent yield of the work is approximately 49.59%. The percent yield is a measure of the efficiency of a chemical reaction or process.

Percent yiel represents the ratio of the actual yield to the theoretical yield, expressed as a percentage. In this case, the actual yield is the amount of silver (Ag) extracted, which is given as 2.44 grams. The theoretical yield is the amount of silver that would be obtained if the reaction proceeded with 100% efficiency, which can be calculated from the amount of silver nitrate (AgNO3) used.

To determine the theoretical yield, we need to consider the stoichiometry of the reaction. The balanced equation for the reaction between silver nitrate and silver is:

2 AgNO3 + 2 Ag → 2 Ag2O + N2O + O2

From the equation, we can see that 2 moles of silver nitrate react to produce 2 moles of silver. Therefore, the molar ratio between silver nitrate and silver is 1:1.

Given that the mass of silver nitrate used is 4.92 grams, we can convert this to moles using the molar mass of AgNO3 (169.87 g/mol). The molar mass of silver (Ag) is 107.87 g/mol.

Moles of AgNO3 = 4.92 g / 169.87 g/mol = 0.02895 mol

Since the molar ratio between AgNO3 and Ag is 1:1, the theoretical yield of silver is also 0.02895 mol.

Converting the theoretical yield to grams:

Theoretical yield of Ag = 0.02895 mol × 107.87 g/mol = 3.125 grams

Now we can calculate the percent yield:

Percent yield = (Actual yield / Theoretical yield) × 100

= (2.44 g / 3.125 g) × 100

≈ 49.59%

Therefore, the percent yield of the work is approximately 49.59%.

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Answer:

D

Explanation:

While scientific laws more accurately forecast natural events, scientific theories are beliefs that explain natural happenings. So, the correct option is D.

Scientific laws are explanations for why certain occurrences occur or explanations of the phenomenon occurring itself. The outcomes or the causes of such phenomena are not explained. By stating a link verbally or mathematically, it only clarifies the situation and makes the underlying "science" simpler to comprehend.

On the other hand, scientific theories are those that make an effort to define or clarify why a phenomenon occurs. Its foundation is observation. Before drawing a conclusion, there is still a process of learning or discovery. It is a conceptual framework for explaining and projecting new information.

Thus, the correct option is D.

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The energy of the photon released by the microwave is 19.86 x 10⁻²⁵ J.

The microwave releases photon of a particular energy.

The energy of the photon is given by,

E = hv

Where,

E is the energy of the photon,

h is the Planck's constant,

v is the frequency of the photon.

The value of the Planck's constant is 6.62 x 10⁻³⁴ m²kg/s

The value of the frequency of the photons released by the microwave is 3 x 10⁹ Hz.

Now, putting the values,

E =  6.62 x 10⁻³⁴ x 3 x 10⁹

E = 19.86 x 10⁻²⁵ J.

The energy of the photon is 19.86 x 10⁻²⁵ J.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 325 mL

density = 0.874 g/mL

We have

mass = 325 × 0.874

We have the final answer as

Hope this helps you

Answer:

Explanation:

Noble gases have completely filled electronic configuration. Therefore, noble gases or group 18 elements are inert in nature.

Noble gases are 18th group elements in periodic table. They are all having complete filled electronic configuration. The group members are helium, neon, argon, krypton, xenon and radon.

All these elements are existing in gaseous state and they are unreactive. Atoms become reactive when they have extra electrons or are deficient of electrons. Thus to achieve octet, they bond with other atoms.

In the case of noble gases, the valence shell is already achieved octet and no need of lose or gain of electrons. Thus, they are generally inert.

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Between OH and C=O, the strong nucleophile is OH and the strong electrophile is C=O.

1. OH (hydroxide ion) is a strong nucleophile because it has a negative charge on the oxygen atom, which allows it to donate its lone pair of electrons to an electrophilic center.
2. C=O (carbonyl group) is a strong electrophile because the carbon atom has a partial positive charge due to the electronegativity difference between carbon and oxygen atoms in the double bond. This makes the carbon atom highly susceptible to nucleophilic attack.

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Because a clinical thermometer cannot measure high temperatures, leaving it in the sun or near a flame will cause it to break. It will not melt because the temperature in sunlight or near a flame is not high enough to melt the glass.

Because a clinical thermometer cannot measure high temperatures, leaving it in the sun or near a flame will cause it to break. It will not melt because the temperature in sunlight or near a flame is not high enough to melt the glass.
The hot glass expands, making more room for the mercury inside, causing the mercury column to fall. The mercury then heats and expands, lengthening the mercury column in the thermometer. Mercury is not flammable. The agent does not burn, but when heated, it can produce corrosive and/or toxic fumes. Fire emits irritant, corrosive, and/or toxic gases. Use an extinguishing agent appropriate for the type of fire in the vicinity.

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Answer:

100 degree celcius, because it is the melting point of ice ob

Answer: The correct answer is 100 °C, because it is the boiling point of water.

Explanation: A heating curve has two flat lines(Or plateaus). The first one is the melting point, the second one is the boiling point. In your problem, C is the second flat line, so it is boiling point.

Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

The net ATP generated by the β-oxidation of the 20-carbon fatty acid is 156 ATP.

The β-oxidation of a 20-carbon fatty acid generates 10 acetyl CoA, 9 FADH₂, and 9 NADH.

To calculate the ATP yield, use the following conversion factors:

Each acetyl CoA entering the citric acid cycle generates 12 ATP.

Each FADH₂ generates 1.5 ATP.

Each NADH generates 2.5 ATP.

Acetyl CoA:

10 acetyl CoA × 12 ATP/acetyl CoA = 120 ATP

FADH₂:

9 FADH₂ × 1.5 ATP/FADH₂ = 13.5 ATP

NADH:

9 NADH × 2.5 ATP/NADH = 22.5 ATP

120 ATP (from acetyl CoA) + 13.5 ATP (from FADH2) + 22.5 ATP (from NADH) = 156 ATP

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When calcium hydroxide has a Ksp of 4.68 x 10⁻⁶, the number of moles of calcium hydroxide that will dissolve in 1 L of pure water is 1.05 × 10⁻² mol, the number of moles of calcium hydroxide that will dissolve in 1 L of 3. 25 M NaOH solution is 4.43 × 10⁻⁷ and the minimum concentration of sodium hydroxide is needed to precipitate calcium from a 0. 015 M solution of calcium chloride is 0.09 M.

(A)

Ksp of Ca(OH)₂ = 4.68 × 10⁻⁶

Ca(OH)₂ → Ca²⁺ + 2OH⁻

Ksp = [Ca²⁺] [OH⁻]²

⇒ Ksp = S × (2S)²

⇒ Ksp = 4S³

⇒ S = (Ksp/4)^1/3

⇒ S =  (4.68 × 10⁻⁶/4)^1/3

⇒ S = 0.0105 M

Mole of Ca(OH)₂ = Solubility × Volume

                           = 0.0105 M × 1L = 1.05 × 10⁻² mol

(B)

Ca(OH)₂ →  Ca²⁺ + 2OH⁻

Ksp = [Ca²⁺] [OH⁻]²

4.68 × 10⁻⁶ = S × (3.25)²

S = (4.68 × 10⁻⁶)/(3.25)² = 4.43 × 10⁻⁷ M

Mole of Cu(OH)₂ = Solubility × Volume

                           = 4.43 × 10⁻⁷ M × 1 L = 4.43 × 10⁻⁷ M

(C)

Ca(OH)₂ → Ca²⁺ + 2OH⁻

Ksp = [Ca²⁺] [OH⁻]²

4.68 × 10⁻⁶ = 0.015 × (2S)²

S = [4.68 × 10⁻⁶ / 0.015 × 4]^1/2

S = 8.83 × 10⁻³ M = 0.0883 M = 0.09 M

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