Strontium-90 is present in radioactive fallout and has a half-life of 28.8 years. The first atomic detonation was at a place called Trinity Site in New Mexico in 1945 - 68 years ago. What percentage of Strontium-90 would remain in the soil at the site?
Round your answer to the nearest 5%. Example: If your answer would be greater than or equal to 32.5%, and less than 37.5%, you would report 35 - do not use a decimal or percent sign (%) after the number.

Answer:

a composition of elements

Answer: Pressure of the gas is 19.65 atm.

Explanation: Known quantities=

No of moles=37

Temperature=167 °C=440K

Volume=68 liters

unknown quantities

Pressure=x atm

The unknown quantity pressure can be found out by using the ideal gas law equation given by:

PV=nRT ---------- (1)

P = pressure.

V =volume.

n =amount of substance.

R= ideal gas constant.

Substituting the values in equation (1)

P=(37x0.0821x440)/(68)

=19.65 atm

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Answer:

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K.The mixture reacts completely with 130 g of O2 to produce CO2 and H2O . Assuming ...

Missing: 32 ‎Br2

Answer:

a.25.50

Explanation:

Explanation:

We determine the mass of the helium gas,

mHe, that is required to produce the given sample. We do this by first considering that neon gas behaves ideally with the given conditions, such that we use the equation

PV=nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Moreover, we express the number of moles as:

n= mMW

where 'MW is the molar mass. We use the following values for the variables:

P =255atm

V =100.0 L

R = 0.08206Latm/molK

T = 25 + 273= 298 K

MW = 4.003 g/mol

We proceed with the solution.

We would need a total of 4.17×103 grams of helium gas.Now, we determine the mass when we are going to consider oxygen gas. We would be applying the same working equation but we use a different value for MW, wherein we have

MW=16.00g/mol

We proceed with the solution and plug in the variables

We would need a total of 1.67×10^4 grams of oxygen gas.

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The maximum temperature of the water in the insulated container after the copper metal is added is 40.7 °C.

The problem can be solved using the principle of conservation of energy, which states that the heat lost by the copper metal is equal to the heat gained by the water.

To calculate the heat lost by the copper, the formula

q = m * c * delta T

is used, where q is the heat lost, m is the mass of copper, c is the specific heat of copper, and delta T is the change in temperature of the copper.

Given that the copper is heated from 19.3 °C to 100.0 °C, the heat lost by the copper is calculated to be 450.5 J.

To calculate the heat gained by the water, the same formula is used, where m is the mass of water, c is the specific heat of water, and delta T is the change in temperature of the water.

We are given that the initial temperature of the water is 19.3 °C and the mass of water is 47.5 g. Assuming the final temperature of the water to be T °C, the expression for the heat gained is

47.5 g * 4.184 J/(g·°C) * (T - 19.3) °C.

Equating the expressions for the heat lost and gained, we get

450.5 J = 47.5 g * 4.184 J/(g·°C) * (T - 19.3) °C.

Simplifying and solving for T, we get

T = 40.7 °C,

which is the final temperature of the water after the copper is added.

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A metastable system is a physical or chemical system that is in a stable equilibrium state but has the potential to move to a more stable state with lower energy if it is subjected to an external perturbation or trigger.

In a metastable system, the energy of the system is high enough to keep it in a stable state but is not high enough to allow it to reach the lowest possible energy state or equilibrium.

This makes the system unstable, as it can be triggered to transition to a more stable state with a lower energy level. However, the system may remain in the metastable state for a long time if the external conditions or triggers are not present to initiate the transition to the lower energy state.

Thus, metastable systems are important in various fields, including physics, chemistry, materials science, and biology, and understanding their behavior is crucial in designing and predicting the properties of materials and systems.

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After considering all the given options we come to the conclusion that the set of products that are accurate for double replacement reaction is 2KNO₃ (aq) + PbI₂ (s), which is Option D under the condition that the given reaction is 2KI(aq) + Pb(NO₃)₂(aq).

A double replacement reaction generally comprised of reactions in regarding the positive and negative ions of two ionic compounds exchanges locations to form two new compounds. The general form for this type  reaction is: AB + CD → AD + CB .
For instance, when silver nitrate (AgNO₃) is added  with sodium chloride (NaCl), the following reaction takes place AgNO₃ + NaCl → AgCl + NaNO₃ ²

The correct set of products for the double replacement reaction 2KI(aq) + Pb(NO₃)₂(aq) is 2KNO₃ (aq) + PbI₂ (s).
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Answer: D

Explanation:

Thermal energy is akin to kinetic energy, which is movement of particles in a substance.

Answer:

[OH⁻] = 8.33 * 10⁻¹²

Explanation:

We know that [OH⁻] * [H⁺] = 10⁻¹⁴

plugging the value of [H⁺]

[OH⁻] * 1.2 * 10⁻³ = 10⁻¹⁴

[OH⁻] = 10⁻¹⁴ * (10³/1.2)

[OH⁻] = 833.3 * 10⁻¹⁴

[OH⁻] = 8.33 * 10⁻¹²

Sodium carbonate, also known as washing soda or soda ash, has a wide range of applications. Sodium carbonate can be naturally occurring or synthetically produced through various methods, including the Solvay process, which is the most common method of industrial production.

Sodium carbonate, also known as washing soda or soda ash, has many uses, including:

1) Cleaning agent: Sodium carbonate is an effective cleaning agent due to its alkaline nature. It is used in laundry detergents and household cleaners to remove stains and grease from clothes and surfaces.

2) Industrial applications: Sodium carbonate is used in a variety of industrial applications. It is used in the production of glass, pulp and paper, and soaps and detergents. It is also used as a water softener and pH regulator in chemical processes.

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Temp. is lowered from 15 to 10 degrees C: Pressure decreased

Temp. rises from 20 to 30 degrees C: Pressure increased

More molecules of gas are introduced into the container: Pressure increased

The volume of the container holding gas is increased: Pressure decreased

The pressure of a gas is affected by several factors, such as temperature, the number of gas molecules present, and the volume of the container.

When the temperature of a gas is lowered, the kinetic energy of the gas molecules decreases. As a result, the molecules move slower and exert less force on the walls of the container, causing the pressure to decrease.

Conversely, when the temperature is raised, the kinetic energy of the gas molecules increases, leading to more collisions with the walls of the container and an increase in pressure.

When more gas molecules are added to a container, there are more collisions between the gas molecules and the walls of the container. This increase in collisions leads to an increase in pressure. On the other hand, if the number of gas molecules is decreased, there are fewer collisions with the walls of the container, resulting in a decrease in pressure.

Finally, the pressure of a gas is inversely proportional to the volume of the container holding the gas. When the volume of the container is increased, the gas molecules have more space to move around, and fewer collisions occur with the walls of the container.

As a result, the pressure decreases. Conversely, when the volume of the container is decreased, the gas molecules have less space to move, leading to more collisions with the walls of the container and an increase in pressure.

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PROPER QUESTION

Read each description of the various conditions that are likely to affect the pressure of a gas. Drag each description into the correct box.

Temp. is lowered from 15 to 10 degrees C

Temp. rises from 20 to 30 degrees C

More molecules of gas are introduced into the container

The volume of the container holding gas is increased

Box:

Pressure increased

Pressure decreased

The experimenters could isolate the effect of the color of the cans on the temperature of the water inside, assuming all other variables were held constant.

A scientific or empirical approach of testing a hypothesis or looking into a particular phenomena or relationship between variables is to conduct an experiment. In order to monitor changes in one or more dependent variables, it entails changing one or more independent variables while holding all other variables constant.

The variables that were controlled in the experiment were:

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A symbol used in a chemical equation is called a chemical formula. A chemical formula is a shorthand notation that represents the type and number of atoms in a molecule or compound.

The elements are represented by their chemical symbols, and the number of atoms of each element is indicated by a subscript written to the right of the symbol. The chemical formula for a reactant or product in a chemical equation provides information about the identity and amount of substances involved in the reaction.

Chemical formulas are typically composed of chemical symbols and numerical subscripts that indicate the number of atoms or molecules of each element or compound present in the reaction.

For example, in the chemical equation [tex]H_2 + O_2[/tex] → [tex]2H_2O[/tex]  , the chemical formulas are [tex]H_2[/tex], [tex]O_2[/tex], and [tex]H_2O[/tex], which represent the molecules of hydrogen gas, oxygen gas, and water, respectively.

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The skier is able to coast between points s and t even though it is uphill because of gravity. The correct answer is A.

Gravity is the force that pulls objects towards each other. In the case of a skier coasting uphill between points s and t, gravity is still acting on the skier, pulling them towards the Earth. This gravitational force is what allows the skier to maintain their speed and momentum, even as they move uphill.

While centripetal force, cohesive force, and inertia are all important concepts in physics, they are not directly relevant to the scenario described in the question.

Centripetal force refers to the force that keeps an object moving in a circular path, cohesive force refers to the force that holds molecules together in a substance, and inertia refers to an object's tendency to resist changes in motion.

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The transition that involves the greatest change in energy is the transition shown by (f)

When an electron moves from one energy level to another, this is referred to as an energy transition in an atom. An atom's electrons can be found in various orbitals or energy levels, and because these levels are quantized, only specific values are permitted.

The transition in f involves a movement from n = 1 to n =4 that shows a great involvement of energy for such to occur.

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The AH for the reaction 2NC1(g) +[tex]3H_{2}[/tex](g) → [tex]N_{2}[/tex](g) + 6HCl(g) using bond energies is -1,074 kJ/mol, indicating an exothermic reaction.

To predict the enthalpy change (AH) of the reaction using bond energies, we need to calculate the energy required to break the bonds in the reactants and the energy released when the products' new bonds are established.

The AH of the reaction is the difference between the energy required to break the bonds in the reactants and the energy released when new bonds are formed in the products.

The following is the chemically balanced equation for the reaction:

2NC1(g) + [tex]3H_{2}[/tex](g) → [tex]N_{2}[/tex](g) + 6HCl(g)

The bond energies that we need are:

Bond energies to break:

N≡C1: 305 kJ/mol

H-H: 436 kJ/mol

Bond energies to form:

N≡N: 946 kJ/mol

H-Cl: 431 kJ/mol

Now we can calculate the energy required to break the bonds in the reactants:

2(N≡C1)(305 kJ/mol) + 3(H-H)(436 kJ/mol) = 2(610 kJ/mol) + 3(436 kJ/mol) = 2,218 kJ

We can also calculate the energy released when new bonds are formed in the products:

1(N≡N)(946 kJ/mol) + 6(H-Cl)(431 kJ/mol) = 1(946 kJ/mol) + 6(431 kJ/mol) = 3,292 kJ

Therefore, the AH of the reaction is:

AH = energy released when new bonds are formed minus energy needed to break existing bonds.

= -1,074 kJ/mol

The exothermic nature of the reaction, or the release of energy, is indicated by the negative sign. Therefore, the AH of the reaction is -1,074 kJ/mol.

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The half-reaction that occurs at the anode is :

The cell potential (Ecell) is 1.560 V

The  Keq for this reaction is 6.98 x 10¹³

The half-reactions occurring in the voltaic cell are given below:

Cathode: Pd²⁺(aq) + 2e⁻ → Pd(s)

Anode: Cu(s) → Cu²⁺(aq) + 2e⁻

The half-reaction that occurs at the anode is the oxidation of copper:

Cu(s) → Cu²⁺(aq) + 2e⁻

The cell potential (Ecell) can be calculated using the formula:

Ecell = E°cathode - E°anode

Ecell = 0.951 V - (-0.609 V) (Note: E°anode is negative because it's an oxidation reaction)

Ecell = 1.560 V

(b) The equilibrium constant (Keq) can be calculated using the Nernst equation:

Ecell = E°cell - (RT/nF)lnKeq

where:

R = gas constant = 8.314 J/mol-K

T = temperature in Kelvin = 298 K

n = number of moles of electrons transferred in the balanced redox equation = 2

F = Faraday's constant = 96,485 C/mol

Rearranging the equation and solving for Keq, we get:

lnKeq = (nF/RT)Ecell - (nF/RT)E°cell

Keq = [tex]e^{(nF/RT)(Ecell - E^{o}cell)}[/tex]

Keq = [tex]e^{((296485)/(8.314298))(1.560 - 0.342)}[/tex]

Keq = 6.98 x 10¹³

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Chemical and physical methods are two approaches used to measure the rate of chemical reactions. Chemical methods involve the use of spectroscopic techniques and analyses of reaction products to measure the speed of a reaction. Physical methods involve using thermodynamics and other physical measurements to determine the speed of a reaction.

Both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

option B is correct.

Based on the given models, the statement that is most likely correct is: Both models show reactions which produce energy in the sun.

Model 1 represents a type of nuclear reaction called fusion, which is the process of combining two atomic nuclei to form a heavier nucleus. Fusion reactions occur naturally in stars like the sun, where the high temperatures and pressures allow atomic nuclei to overcome their natural repulsion and fuse together. The energy released by fusion reactions in the sun is what makes it shine and provides the energy for life on Earth.

Model 2 represents a type of nuclear reaction called fission, which is the process of splitting a heavy atomic nucleus into two or more lighter nuclei. Fission reactions are typically used in nuclear power plants to generate energy, where the heat produced by the fission reactions is used to produce steam and generate electricity. both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

so, the correct option B

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Bodies of water can have a significant impact on climate in several ways, including through the influence of sea breezes, land breezes, and ocean currents.

Sea breezes occur when cooler air from over the water moves towards the warmer air over land. This movement of air can affect the temperature and humidity of coastal areas. During the day, the land heats up faster than the ocean, creating a low-pressure area over the land. The cool air over the ocean then moves towards the warmer, low-pressure air over the land, creating a sea breeze. The opposite occurs at night, when the land cools off faster than the ocean, creating a high-pressure area over the land, and causing a land breeze to blow from the land towards the ocean.

Ocean currents also play a significant role in climate. These currents are like rivers in the ocean, moving water from one place to another. They can transport heat from warmer to cooler areas, affecting the temperature and weather patterns of coastal regions. For example, the Gulf Stream, a warm ocean current that originates in the Gulf of Mexico and flows towards Europe, helps keep the climate of coastal Europe relatively mild.

In addition to sea breezes and ocean currents, bodies of water can also affect climate through their thermal properties. Water has a higher specific heat than land, meaning it can absorb and retain more heat energy. This can result in cooler temperatures near bodies of water during the summer and warmer temperatures during the winter, as the water releases or absorbs heat from the surrounding air.

Overall, bodies of water have a significant impact on climate through their influence on sea breezes, land breezes, ocean currents, and thermal properties. Understanding these processes is essential for predicting and managing climate patterns, particularly in coastal areas.

Answer:

Electrolysis of water

Explanation:

decomposition of water into oxygen and hydrogen due to an electric current being passed through the water.

Answer: Shown below

Explanation:

CaCl2=calcium chloride

Mg(NO3)2=Magnesium nitrate

ZaCl2=Zinc Chloride

NH2Cl=Chloramine

AgNO2=Silver nitrate

NaCl= Sodium chloride

KI=Potassium iodide

PbSO4=Lead(II) Sulfate

n82CO3=Sodium carbonate

KNO3=Potassium nitrate

N82SO4=Sodium Sulfate.

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The name of the compounds and the involved ion are as follows;

Ionic compound is any of a large group of chemical compounds consisting of oppositely charged ions, wherein electron transfer, or ionic bonding, holds the atoms together.

Ionic compounds, when in an aqueous solution, dissociates into its respective ions. This question gives the chemical formula of certain compounds. For example, the sodium ions attract chloride ions and the chloride ion attracts sodium ions. The result is a three-dimensional structure of alternate Na⁺ and Cl⁻ ions.

The names of the chemical compound and the ionic elements that make them up are given in the main answer part.

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The physical examination of an organic compound are appearance and physical state, melting point and boiling point, solubility, density, and spectroscopic analysis

Appearance and physical state: observe the appearance of the compound and note its physical state.

Melting point and boiling point: measure the melting point and boiling point of the compound to determine its purity and identity.

Solubility: Test the solubility of the compound in different solvents such as water, ethanol, acetone, etc.

Density: determine the density of the compound to calculate its molecular weight and to assess its purity.

Spectroscopic analysis: use spectroscopic techniques such as nuclear magnetic resonance (NMR), and mass spectrometry (MS) to determine the functional groups, molecular structure, and identity of the compound.

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Answer:  3.142 M

Explanation:

use the dilution formula

M1V1=M2V2

M2= 5.9 X 4.1 / 7.7  = 3.142 M  if need to correct sig figs its 3.1 M

The chemical compound with highest boiling point is  NaI

Due to ionic bonding between the elements there is a stronger bond that is seen than other compounds. Hence, maximum boiling point.

Answer:

285.35 liters.

Explanation:

To calculate the new volume of the air sample, we can use the formula:

Volume = Mass / Density

Given:

Mass of the air sample = 5.65 × 10^2 g

Initial density of the air sample = 1.24 g/L

Final density of the air sample = 1.98 g/L

Using the formula, we can calculate the initial volume and then use the final density to find the new volume.

Initial Volume = Mass / Initial Density

Initial Volume = 5.65 × 10^2 g / 1.24 g/L

Initial Volume = 456.45 L

New Volume = Mass / Final Density

New Volume = 5.65 × 10^2 g / 1.98 g/L

New Volume = 285.35 L

Therefore, the new volume of the air sample is approximately 285.35 liters.

The percent yield of the reaction 2NO(g)+O₂(g)→2NO₂(g) is 7.98%.

Mole ratio of NO to NO₂ is 2:2 or 1:1. Therefore, the number of moles of NO₂ formed is equal to the number of moles of NO reacted.

For an ideal gas, PV = nRT

                              n = PV/RT where temperature is in kelvin

volume of NO₂ formed = 98.3 L

temperature = 39.0°C or 312.15 K

pressure = 631 mmHg or 0.830 atm

n(NO) = PV/RT \

= (0.830 atm)(98.3 L)/(0.0821 L·atm/mol·K)(312.15 K)

= 33.6 mol

Since, the ratio is 1:1  yield of NO₂ is also 33.6 mol.

Actual yield can be found by converting moles in molar mass of NO₂

NO₂: 1 × 14.01 + 2 × 16.00 = 46.01 g/mol

If  the mass of NO2 obtained was 123.4 g. Then the number of moles of NO₂ is

n(NO₂) = m/M = 123.4 g/46.01 g/mol = 2.68 mol

% yield = (actual yield/theoretical yield) x 100%

= (2.68 mol/33.6 mol) x 100%

= 7.98%

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The solution contains 66 g of sodium acetate, which is less than the maximum amount that can remain in the solution, no recrystallization occurs when a seed crystal is added.

Calculate the amount of sodium acetate that dissolves in 100 g of water at 25°C:

46 g NaC₂H₃O₂ / 100 g H₂O = x / 100 g H₂O

x = 46 g

Therefore, at 25°C, the solution is already supersaturated and contains 112 g - 46 g = 66 g of undissolved sodium acetate.

When the solution is heated to 100°C, all the sodium acetate dissolves, since the solubility at this temperature is 170 g per 100 g H₂O. The total mass of the solution is now 100 g + 112 g = 212 g.

When the solution is cooled back to 20°C, the solubility of sodium acetate decreases to 46 g per 100 g H₂O. The maximum amount of sodium acetate that can remain in solution at this temperature is:

46 g NaC₂H₃O₂ / 100 g H₂O x 212 g H₂O = 97.52 g NaC₂H₃O₂

All the sodium acetate remains dissolved in the solution.

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