Question 3 (12 points)
The core becomes a
a hot, dense, slowly cooling sphere of carbon.
Оа
red dwarf

Answer:

4.2  g  

Explanation:

The VOLUME of the ring is   4.2 - 4.0 = .2 ml  = .2 cm^3

the MASS of the ring is this times the density

.2 cm^3  *  21 g/cm^3 = 4.2 g

Answer:

the answer is c

Explanation:

density is mass/volume

so mass=density × volume

but we take the change is volume that is v2-v2=4.2-4=0.2ml

but the density is in gm/cm^3 so we should convert ml into cm^3. eventually they are equal so mass=21×0.2=4.2

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer: 64.7 \(*10^2\)

Explanation:

Significant figures are the number of digits in a value that correlate with the accuracy of that value.

First lets solve the equation:

(1.7x10^6)/(2.63x10^2) + 7.33 = ?

(1,700,000)/(263) + 7.33

(6,463.8783) + 7.33 = 6,471.2083

We have to simplify the answer to the correct amount of significant digits.

6,471.2083 -> 64.7 \(*10^2\)

Answer:primary consumer

Explanation:

i got it right

The general gas equation, commonly referred to as the ideal gas law, represents the state of a fictitious ideal gas through an equation. The molar mass of ethylene gas when the pressure is 755.3 mmHg, the temperature is 25.0 °C and it weighs 36.2449 g is 28.29 g/mol.

According to the ideal gas law, the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas.

The ideal gas equation is:

PV = nRT

n = PV / RT

755.3 mmHg = 0.99 atm

25.0 °C = 298 K

R = 0.082 atm·L·mol⁻¹·K⁻¹

Mass of water = 142.3415 - 36.1235 = 106.218 g

Density = Mass / Volume

V = m / d = 106.218 / 0.9970 = 106.53 mL = 0.106 L

n = 0.99 × 0.106 / 0.082 × 298  = 0.00429 mol

Mass of ethylene gas = 36.2449 - 36.1235 = 0.1214 g

Molar mass =  0.1214 / 0.00429 = 28.29 g/mol

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The metal X has an approximate molar mass of 42.36 g/mol and the metal is most likely calcium.

The molar mass of the metal carbonate XCO₃ and identify the metal X, we need to calculate the number of moles of XCO₃ and CO₂ using the given masses and molar masses.

The molar mass of CO₂ (carbon dioxide) is 12.011 g/mol (for carbon) + 2 * 15.999 g/mol (for oxygen) = 44.01 g/mol.

The number of moles of CO₂ can be calculated using the formula:

moles of CO₂ = mass of CO₂ / molar mass of CO₂

moles of CO₂ = 0.855 g / 44.01 g/mol

moles of CO₂ ≈ 0.01944 mol

Since the reaction stoichiometry is 1:1 between XCO₃ and CO₂, the number of moles of XCO₃ is also approximately 0.01944 mol.

molar mass of XCO₃ = mass of XCO₃ / moles of XCO₃

molar mass of XCO₃ = 2.012 g / 0.01944 mol

molar mass of XCO₃ ≈ 103.38 g/mol

The molar mass of XCO₃ is approximately 103.38 g/mol.

To determine the metal X:

molar mass of X = molar mass of XCO3 - molar mass of CO3

molar mass of X = 103.38 g/mol - (12.011 g/mol + 3 * 15.999 g/mol)

molar mass of X ≈ 42.36 g/mol

Metal X is most likely Calcium that has a molar mass of 40 g/mol

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Answer:

B. Air

Explanation:

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

THANKS

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The type of movement that occurs in the plate movement listed above include the following:

These are gigantic pieces of the Earth's crust and uppermost mantle and are made up of oceanic crust and continental crust.

A convergent boundary as the name implies occurs when lithospheric plates are moving towards one another.

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8.253 is the pH of a 0.307 M solution of NaNO\(_2\). The ionization constant, a, for the acid, HNO\(_2\), is 4.60×10⁻⁴.

In chemistry, the pH scale is used to define the level of basicity or acidity of an aqueous. pH has historically stood for " Hydrogen potential" (or "power of hydrogen").

Lower pH values are recorded for acid solution (solutions with greater H ion concentrations) than for basic or alkaline solutions.

NO\(_2\)⁻ + H\(_2\)O → HNO\(_2\) + OH⁻

Kb = [HNO\(_2\) ][OH⁻]/[NO\(_2\)⁻]

Kb = 1.00X10⁻¹⁴

Kb = 1.00X10⁻¹⁴/ 4.60X10⁻⁴= 2.17X10⁻¹¹

[HNO\(_2\) ] = [OH⁻] = x

[NO\(_2\)⁻ ] = 0.148-x

Kb = 2.17X10⁻¹¹= x² / 0.148

x = [OH⁻] = 1.79X10⁻⁶

pOH = 5.747

pH = 14.000 - pOH = 8.253

Therefore, 8.253 is the pH of a 0.307 M solution of NaNO\(_2\). The ionization constant, a, for the acid, HNO\(_2\), is 4.60×10⁻⁴.

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Answer:

Top answer:

The maximum mass of water (H₂O) produced from the reaction between

Explanation:

Gaseous methane ch4 will react with gaseous oxygen o2 to produce gaseous carbon dioxide co2 and gaseous water h2o . suppose 1.44 g of ...

The concentration of the solution if the absorbance of the solution at 427 nm is 0.15 and the molar absorptivity of yellow dye at 427 nm is 5.47 × 10-⁶M.

Absorbance in physics is a logarithmic measure of the amount of light that is absorbed when passing through a substance.

It is the capacity of a substance to absorb light of a given wavelength. According to this question, the absorbance of the solution at 427 nm is 0.15.

A = εmCl

Where;

C = 0.15 ÷ (27400 × 1)

C = 5.47 × 10-⁶M

Therefore, 5.47 × 10-⁶M is the concentration of the solution.

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With the given materials following  experiment can be done

Electrical conductivity test:

Metals are good conductors of electricity, therefore when you join metals with a battery, wire, and bulb, you get a bulb.

Similarly, if nonmetals are poor electrical conductors, they may not ignite the bulb when attached to a wire and a battery.

Generally, the above method can be used to identify metals and non-metals. But there are some exceptions also,. Graphite, an allotrope of non-metal carbon, is a good conductor of electricity.

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The periodic chart has many different types of elements. Some elements are metals, some are nonmetals, and yet others are metalloids. Therefore, by electrical conductivity test, we can detect metal and non metal.

Metals are hard, conduct electricity, are ductile, lustrous, and malleable materials.

Since metals have free electrons that's why they can conduct electricity.  Since atoms in metals are very closely packed in a definite crystal solid. It is not brittle that is it can not be broken down easily.

Metals carry electricity well, therefore when you combine metals with a battery, wire, and bulb, you get a light. Similarly, if nonmetals are poor electrical conductors, when connected to a wire and a battery, they may not light the bulb.

Therefore, by electrical conductivity test, we can detect metal and non metal.

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From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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1. The pKa of the unknown acid is equal to the pH measured at 25.40 mL, which is 3.86.

2. The Ka of the unknown acid is 1.39 x \(10^{-4}\).

To calculate the Ka of the unknown acid, we can use the Henderson-Hasselbalch equation:

\(pH = pKa + log([A^-]/[HA])\)

At the equivalence point, \([A^-] = [HA]\), so we can simplify the equation to:

pH = pKa + log(1)

which means that pH = pKa.

Therefore, the pKa of the unknown acid is equal to the pH measured at 25.40 mL, which is 3.86.

To calculate the Ka of the unknown acid, we can use the relationship between Ka and pKa:

Ka = \(10^{-pKa}\)

We already know the pH and pKa values, so we can solve for Ka:

Ka =\(10^{-pKa}\) = \(10^{-3.86}\) = 1.39 x \(10^{-4}\).

Therefore, the Ka of the unknown acid is 1.39 x \(10^{-4}\).

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Answer:

7.41 × 10⁻⁵

Explanation:

Let's consider the basic dissociation reaction of trimethylamine (CH₃)N).

(CH₃)N + H₂O = (CH₃)NH⁺ + OH⁻

According to Brönsted-Lowry, in this reaction (CH₃)N is a base and (CH₃)NH⁺ is its conjugate acid. The pKb for (CH₃)N is 9.87. We can calculate the pKa of (CH₃)NH⁺ using the following expression.

pKa + pKb = 14

pKa = 14 - pKb = 14 - 9.87 = 4.13

Then, we can calculate the acid dissociation constant for (CH₃)NH⁺ using the following expression.

pKa = -log Ka

Ka = antilog - pKa = antilog -4.13 = 7.41 × 10⁻⁵

Answer:

Exothermic Reaction

Product  = Calcium hydroxide + hydrogen

Explanation:

The force applied to the rocket by its engines remains constant as it moves up, while its mass decreases, resulting in an increase in acceleration.

Newton's laws of motion provide an explanation for the acceleration of a rocket as it moves away from the ground. According to Newton's second law, the force exerted on an object is directly proportional to its acceleration, and the force required to move an object increases as its mass increases.

In the case of a rocket, its mass decreases as it consumes fuel, which means that less force is required to move it as it climbs higher into the atmosphere.

As the rocket moves up, its acceleration increases while the force exerted on it remains constant. Newton's second law of motion explains that the acceleration of an object is directly proportional to the force applied to it. According to the second law of motion, an object's acceleration is equal to the force exerted on it divided by its mass.

This means that as the rocket climbs higher and its mass decreases due to the consumption of fuel, less force is required to accelerate it, and so its acceleration increases. In other words, the rocket's acceleration is increasing because the force required to move it is decreasing due to the decreasing mass of the rocket.

This phenomenon is also related to Newton's third law of motion, which states that every action has an equal and opposite reaction. The force exerted by the rocket's engines is balanced by an equal and opposite force exerted on the rocket by the exhaust gases, according to this law.

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the Calorimetry relationships you can find the amount of water in the calorimeter is      m = 21.3 g

given parameters

to find

The body of water

Thermal energy is the energy stored in the body that can be transferred as heat when two or more bodies are in contact. Calorimetry is a technique where the energy is transferred between the body only in the form of heat and in this case the thermal energy of the lead is transferred to the calorimeter that reaches the equilibrium that the thematic energy of the two is equal

              Q_{ceded} = Q_{absorbed}

Lead, because it is hotter, gives up energy

              Q_{ceded} = M c_{e Pb} (T₁ - T_f)

The calorimeter that is colder absorbs the heat

              Q_{absrobed} = m c_{e H_2O} (T_f - T₀)

where M and m are the mass of lead and water, respectively, c are the specific heats, T₁ is the temperature of the hot lead, T₀ the temperature of cold water and T_f the equilibrium temperature

              M c_{ePb} (T₁ - T_f) = m c_{eH2O} (T_f - T₀)

               m = \(\frac{ M\ c_{ePb} \ (T_1 - T_f)}{c_{eH_2O} \ (T_f - T_o)}\)

let's calculate

              m = \(\frac{200 \ 0.129 (176.4-56.4)}{ 4.186 \ (56.4 -21.7)}\)

              m = 3096 / 145.25

              m = 21.3 g

Using the Calorimetry relationships you can find the amount of water in the calorimeter is:

             m = 21.3 g

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The formula for iron (II) sulfate hexahydrate

\(is\)

FeH12O10S

Answer:

The concentration takes 25.360 seconds to decrease to one-ninth of its initial value.

Explanation:

The decomposition of the compound has an exponential behavior and process can be represented by this linear first-order differential equation:

\(\frac{dc}{dt} = -\frac{1}{\tau}\cdot c(t)\)

Where:

\(\tau\) - Time constant, measured in seconds.

\(c(t)\) - Concentration of the compound as a function of time.

The solution of the differential equation is:

\(c(t) = c_{o} \cdot e^{-\frac{t}{\tau} }\)

Where \(c_{o}\) is the initial concentration of the compound.

The time is now cleared in the result obtained previously:

\(\ln \frac{c(t)}{c_{o}} = -\frac{t}{\tau}\)

\(t = -\tau \cdot \ln \frac{c(t)}{c_{o}}\)

Time constant as a function of half-life is:

\(\tau = \frac{t_{1/2}}{\ln 2}\)

Where \(t_{1/2}\) is the half-life of the composite decomposition, measured in seconds.

If \(t_{1/2} = 8\,s\), then:

\(\tau = \frac{8\,s}{\ln 2}\)

\(\tau \approx 11.542\,s\)

And lastly, given that \(\frac{c(t)}{c_{o}} = \frac{1}{9}\) and \(\tau \approx 11.542\,s\), the time taken for the concentration to decrease to one-ninth of its initial value is:

\(t = -(11.542\,s)\cdot \ln\frac{1}{9}\)

\(t \approx 25.360\,s\)

The concentration takes 25.360 seconds to decrease to one-ninth of its initial value.

Mass of (NH₄)₂U₂O₇ : 410.05 kg

Reaction

2UO₂SO₄ + 6NH₃ + 3H₂O → (NH₄)₂U₂O₇ + 2(NH₄)₂SO₄

MW UO₂SO₄ :  366.091

MW (NH₄)₂U₂O₇ : 624.131

MW H₂O :  18.0153

MW NH₃ : 17.0306

mol of 100 kg water :

\(\tt \dfrac{100}{18.0153}=5.55\)

mol of 100 kg ammonia :

\(\tt \dfrac{100}{17.036}=5.87\)

mol of UO₂SO₄ :

\(\tt \dfrac{481}{366.091}=1.314\)

Limiting reactants : smallest mol ratio(mol : coefficient)

\(\tt \dfrac{5.55}{3}\div \dfrac{5.87}{6}\div \dfrac{1.314}{2}=1.85\div 0.98\div 0.657\)

UO₂SO₄ ⇒ Limiting reactants

mol (NH₄)₂U₂O₇ : mol UO₂SO₄

\(\tt \dfrac{1}{2}\times 1.314=0.657\)

mass (NH₄)₂U₂O₇

\(\tt 0.657\times 624.131=410.05\)

Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

A) Ethanol in water: Distillation.

B) Boiling the mixture of chloride crystals with water: Evaporation.

C) Pure water from muddy water: Filtration.

D) Sodium chloride in water: Evaporation or Crystallization.

E) Sodium carbonate in water: Filtration or Evaporation.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol.

G) Mixture of acetic acid and alcohol: Distillation.

H) Serum from blood sample: Centrifugation.

I) Kerosene from water: Separatory funnel or Decantation.

J) Ammonium chloride in sand: Sublimation or Dissolving in water and Filtration.

A) Ethanol in water: Distillation can be used to separate ethanol from water based on their different boiling points.

B) Boiling the mixture of chloride crystals with water: By heating the mixture, the water will evaporate, leaving behind the chloride crystals.

C) Pure water from muddy water: Filtration can be used to separate the solid particles (mud) from the water.

D) Sodium chloride in water: Evaporation can be used to separate sodium chloride from water by heating the mixture until the water evaporates, leaving behind the salt.

E) Sodium carbonate in water: Filtration can be used to separate solid sodium carbonate from water, similar to muddy water.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol or acetone can be used to separate chlorophyll from leaves.

G) Mixture of acetic acid and alcohol: Distillation can be used to separate the mixture based on their different boiling points.

H) Serum from blood sample: Centrifugation can be used to separate the serum, which is the liquid part of blood, from the solid components like cells.

I) Kerosene from water: Separatory funnel or decantation can be used to separate the immiscible liquids by pouring off the top layer (kerosene) from the bottom layer (water).

J) Ammonium chloride in sand: Sublimation can be used to separate ammonium chloride by heating the mixture, causing the ammonium chloride to vaporize and then condense back into solid form in a cooler region, leaving the sand behind.

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We have that  the correct wedge and dash conformation for the following Newman projection is

IV

From the Diagrams above

Two CH_3 groups points on opposite sides in plane

Two Br are on same side  of plane

Two H also on same side of the plane so the plausible  structure is IV

Therefore

The Correct option is IV

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Answer:

D. 2 NO3(aq)+Ca2+

Explanation:

Reaction of calcium nitrate and potassium phosphate produce calcium phosphate and potassium nitrate. The net ionic equation for this is written as : \(3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)\). Thus option C is correct.

What is double displacement reaction?

In a double displacement reaction, two species or groups in reactant side are displaced in the products.

In a balanced chemical equation, all the reactants have to be in proper stochiometric ratio and the states of all species are mentioned in brackets.

In an ionic equation all the ions and charges are balanced both side and the number of each elements on both side too. The net ionic equation represents the formation of a solid product from its ions.

The balanced molecular equation and complete ionic equation are written for the given  reaction below:

\(3 Ca (NO_{3})_{2} (aq)+ 2K_{3} PO_{4} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 KNO_{3}(aq)\)

\(3 Ca^{2+} (aq) +6 NO_{3}^{-} + (aq)+ 6K^{+} + (aq) 2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 NO_{3}^{-} (aq)+ 6K^{+} (aq)\)

Now when the same species on both side is cancelled, then the net ionic equation is written as:

\(3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)\)

Therefore, the correct et ionic equation is option c.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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