a man walked 1560 meters in 16000 seconds what is the speed at which he walked

Answer:

No

Explanation

I say no because that could possibly put many species of animals i danger of nuclear reaction. Not only would it put many animals in danger it would put humans plant and most likely make that area a toxic waste for years

Answer:

No

Explanation:

Answer

84.8485 g

Explanation

Initial temperature, T₁ = 148 °C

Final temperature, T₂ = 20.4 °C

ΔT = T₂ - T₁

ΔT = 20.4 - 148

ΔT = -127.6 °C

Since heat is released, i.e heat loss, then Q = -324.8 calories

specific heat of the lead bar, c = 0.0300 cal/g°C

Using Q = mcΔT, we can find m as shown below

The mass of the bar is 84.8485 g

In a solution of 0.49 M Ca(NO3)2, the molar solubility of calcium fluoride  is 0.86X10-5

The solubility product constant, abbreviated Ksp, can be used to calculate the equilibrium concentration of ions when a salt dissolves in a solvent. Literature can be used to determine the Ksp value of salts that are often consumed at 25°C.

Ca(NO3)2 -> Ca2+(aq) + 2(NO3)-1

        CaF2(s) -> Ca2+(aq) + 2 F-(aq)

I                            0.49                 0

C                            x                     2x

E                          0.49+X             2x

We know the Ksp of Ca2+ is 1.46x10-10

solubility ksp = [Ca2+][F-]2

ksp = (0.49+x) *(2x)^2

1.46x10-10= (0.49) * 4x^2

x= √(0.756*10-10) = 0.86x10-5

Hence the molar solubility of calcium fluoride in a solution containing 0.49M Ca(NO3)2.  is 0.86x10-5M

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The magnitude of the force acting on the body is 4000 Newtons.

To find the magnitude of the force, we can use Newton's second law of motion, which states that the force applied to an object is equal to the product of its mass and acceleration.

The given information includes the mass of the body (80 kg) and the resulting velocity (10 m/s). However, since the time duration (0.2 seconds) is also provided, we can use it to calculate the acceleration of the body.

The formula to calculate acceleration is:

Acceleration = Change in Velocity / Time

The change in velocity can be calculated by subtracting the initial velocity (which is 0 m/s as the body is at rest) from the final velocity:

Change in Velocity = Final Velocity - Initial Velocity

Change in Velocity = 10 m/s - 0 m/s

Change in Velocity = 10 m/s

Now, we can calculate the acceleration:

Acceleration = Change in Velocity / Time

Acceleration = 10 m/s / 0.2 s

Acceleration = 50 m/s²

Finally, we can calculate the magnitude of the force using Newton's second law:

Force = Mass x Acceleration

Force = 80 kg x 50 m/s²

Force = 4000 N

Therefore, the magnitude of the force acting on the body is 4000 Newtons.

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Answer:

C. Ionic-Li and S are two nonmetals

Answer:

Pressure, volume and temperature

Explanation:

Ideal gas law

\(\boxed{pV=nRT}\)

where

p= pressure,

V= volume,

n= number of moles,

R= universal gas constant

T= temperature

_____

The ideal gas law is made up of the 4 laws below:

1) Avogadro's law

• The volume of a sample of gas is directly proportional to the number of moles of gas in the sample at constant temperature and pressure

• V∝ n

2) Boyle's law

• The volume of a fixed mass of gas is inversely proportional to its pressure at constant temperature

• p∝ 1/V

3) Charles' Law

• The volume of gas is directly proportional to its absolute temperature at constant pressure

• V∝ T

4) Gay-Lussac's Law

• The pressure of gas is directly proportional to its absolute temperature at constant volume

• p∝ T

Answer:

nickel 48.1063%

Phosphorus 16.9245%

Oxygen 34.9692%

The percent composition of each element like nitrogen, oxygen and phosphorous in Ni₃(PO₄)₂ are 48.03%, 34.97% and 16.93% respectively.

Percent composition of any element present in any compound will be calculated as:
% comosition = (Mass of element / Mass of compound)×100%

Mass of Ni₃(PO₄)₂ compound = 366.02 g/mol

Molar mass of 3 Nitrogen atoms = 3×58.6 = 175.8 g/mol

Moar mass of 2 Phosphorous atoms = 2×31 = 62 g/mol

Moar mass of 8 Oxygen atoms = 8×16 = 128 g/mol

% comosition of Nitrogen = (175.8/366.02)×100% = 48.03%

% comosition of Oxygen = (128/366.02)×100% = 34.97%

% comosition of Phosphorous = (62/366.02)×100% = 16.93%

Hence % composition of nitrogen, oxygen and phosphorous is 48.03%, 34.97% and 16.93% respectively.

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The pH of a 0.050 M ammonia solution is 12.699 using the appropriate number of significant figures.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.pH can also be reported in significant figures.

pOH =-log(OH⁻)=-log(0.050)=1.301, thus pH= 14-1.301=12.699.

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Human devices use potential energy to store energy, whereas kinetic energy is potential energy in motion. Both types of energies can be measured in Joules (J).

Human devices generate and use different sources of energy, which can be classified into renewable sources (e.g., solar, hydraulic, winds, etc) and non-renewable sources (e.g., nuclear energy) of energy.

For example, a hydroelectric power plant transforms the potential energy stored in water reservoirs (e.g., a lake) into mechanical energy (a type of kinetic energy) when this energy is released from the water reservoir and flows through a turbine.

Subsequently, this type of kinetic energy is then used to generate electricity.

On the other hand, a nuclear power plant uses the potential energy that is stored within the nuclei of atoms to produce kinetic energy by a process known as nuclear fission.

This process (nuclear fission) releases energy in the form of heat (i.e., thermal energy).

Subsequently, this type of kinetic energy (heat) is used to generate steam, which then moves turbines to generate mechanical energy and finally generates electricity.

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Answer: Predominant tropical easterly winds sweep across the central and southern portions of the state, keeping the temperatures mild

Explanation:

bc

Answer:

Body fluid has electrolytes, they are chemicals that dissolve in water and then produce charged ions.

Electrolytes play an important role in our body and there are many of them.

The main electrolytes include chloride, potassium, calcium, sodium, and magnesium.

For example Sodium ions (Na+)

Function in our body: regulate osmotic pressure and the content of water of our body, transmit nerve signals, contract muscle, etc.

That is one type of ion.

The chemical equation given represents a double displacement reaction, also known as a precipitation reaction.

In this type of reaction, two ionic compounds are mixed together, and the cations and anions of each compound switch places to form two new compounds. One of the products is usually a precipitate, which is an insoluble solid that forms from the reaction.

In the given equation, FeCl2 (iron(II) chloride) and AgNO3 (silver nitrate) are two ionic compounds that are mixed together. When they react, the iron(II) cation (Fe2+) and the silver ion (Ag+) switch places, resulting in the formation of Fe(NO3)2 (iron(II) nitrate) and AgCl (silver chloride) as products.

The iron(II) nitrate formed in the reaction is soluble in water and exists in solution as Fe2+ and NO3- ions, whereas the silver chloride formed is insoluble in water and precipitates out of the solution as a solid. Therefore, the formation of AgCl as a solid precipitate confirms that this is a precipitation reaction.

In summary, the given chemical equation represents a double displacement reaction, also known as a precipitation reaction, where Fe2+ and Ag+ ions switch places to form Fe(NO3)2 in solution and AgCl as a solid precipitate.

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The formula for a molecular formed form N and Cl would be N\(Cl_{3}\).

According to the given configuration of Nitrogen(N) and Chlorine(Cl) we have,

N needs 3 electrons and Cl needs 1 electron to complete their octet.

Therefore, one atom of N will combine with three atoms of Cl.

So the molecular formula of the compound formed will be N\(Cl_{3}\).

The addition reaction is:

    N    +     Cl     ------->    N\(Cl_{3}\)

(nitrogen)   (chlorine)     ( Nitrogen(III) chloride)

Therefore the formula for a molecule formed from N and Cl would be N\(Cl_{3}\).

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Answer: D. Synthesis

Explanation:

Sodium Oxide + Water = Sodium Hydroxide

Stoichiometry and the idea of percent yield can be used to calculate the mass of K required to produce 27.6 g of H2. The reaction's balanced chemical equation is 2 K + 2 HCl 2 KCl + H2.

Response and justification Hence, 126.23 g of potassium chlorate are needed to generate 32 g of oxygen.

Divide the mass of the reactant by the molecular weight to get the mass per mole. As an alternative, we can multiply the liquid solution's density in grammes per millilitre by the amount of reactant solution in millilitres. Next, divide the outcome by the reactant's molar mass.

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Answer:

Iodide ion, I- will form the weakest bond with sodium ion, Na+

Explanation:

Electronegativity is the ability with which a neutral atom attracts electrons to itself.

The electronegativity of the halogens decrease on going down the group among the halogens. This is is because on going down the group, the atomic size as well as ionic size of the atoms in the group increases. This increase decreases the effect of the attraction of the positive nucleus on the electrons. Thus, valence electrons can be more readily removed.

The transfer of electrons from metallic sodiummto a halogen results in annionic bond between the two atoms. The strength of the ionic bond decreases on going down the group due to decrease in electronegativity. Thus, iodide ion, I-, which is the least electronegative among the given options will form the weakest bond with Na+.

combustion

burning a hydrocarbon is oxygen produces carbon dioxide and water

Answer:

A. Combustion

Explanation:

It is a reaction that involves the combination of substances with the oxygen in air to produce heat and light

Carbon dioxide is produced when 5 mL of methane gas interacts.

Methane, a hydrocarbon, is the primary component of natural gas. Methane has an effect on the climate and temperature of the earth because it is a greenhouse gas (GHG). Methane is released into the atmosphere through a variety of natural and anthropogenic (caused by humans) sources.

Methane is non-toxic and safe to breathe in small amounts, but if it is allowed to replace air in large quantities, the absence of oxygen could result in suffocation.

\(CH_{4}(g) + 2O_{2} \rightarrow CO_{2} + 2H_{2}O(g)\)

1 volume of \(CH_{4}\) = 1 volume of \(CO_{2}\)

5 ml of \(CH_{4}\) = 1 × 5 mL CO2

                    = 5 mL CO2

So, volume of methane = 5mL

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Free energy change for transporting Ca2+ ions is calculated as follows:∆G = RT ln ([Ca2+]outside/[Ca2+]inside)∆G = 8.315 J/mol.K x 310 K x ln (25 mM/145 mM) = -15,400 J/mol.

Here, ∆G is negative, which implies that Ca2+ ions transport spontaneously from the cell to blood. This is because the free energy of the system decreases when Ca2+ ions move from high concentration to low concentration. Therefore, transporting Ca2+ ions is energetically favorable.

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The number of valence electrons in each of the atoms are;

B - 3

Al - 3

Cl - 7

Ne - 8

We define an atom as the smallest part of a substance that can take part in a chemical reaction. We know that when we begin to break down the elements that the atoms can be found in the element and there are sub atomic particles that can also be found inside the atom of the element.

The electrons that are found at the last shell or the outermost shell of the atom are the ones that we call the valence electrons that can be found in the atom.

The electronic configuration of boron is \(1s^2 2s^2 2p^1\) (the n =2 level is the valence shell)

The electronic configuration of Al is \(1s^2 2s^2 2p^6 3s^2 3p^1\)( the n= 3level is the valence shell)

The electron configuration of Cl is \(1s^2 2s^2 sp^6 3s^23p^5\) ( the n= 3level is the valence shell)

The electron configuration of Ne is \(1s^2 2s^2 2p^6\) (the n =2 level is the valence shell)

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The final isotope produced in the thorium decay series after losing 6 alpha particles and 4 beta particles in a 10-stage process is lead-208. This is because thorium-232 undergoes a series of alpha and beta decay, ultimately resulting in the stable isotope lead-208.

To find the final isotope produced, we need to track the changes in atomic mass and atomic number due to the loss of alpha and beta particles.

1. Alpha particles consist of 2 protons and 2 neutrons, so their loss will result in a decrease of 4 atomic mass units (AMU) and 2 atomic number units.
2. Beta particles are electrons emitted during the decay process, which leads to an increase of 1 atomic number unit without changing the atomic mass.

Now, let's apply these changes to thorium-232:

Initial isotope: Thorium-232 (atomic number 90, atomic mass 232)

Loss of 6 alpha particles:
- Decrease in atomic number: 90 - (6 * 2) = 78
- Decrease in atomic mass: 232 - (6 * 4) = 208

Loss of 4 beta particles:
- Increase in atomic number: 78 + (4 * 1) = 82

Final isotope: Atomic number 82 and atomic mass 208

The element with atomic number 82 is lead (Pb), so the final isotope produced is lead-208 (Pb-208).

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Answer:

Reaction is already balanced

Explanation:

The equation in reaction 1 is given as;

CH3COOH + NaHCO3 --> CO2 + H2O +  Na+   +  CH3COO-

The reaction is already balanced. This is because the umber of atoms of elements in the reactant is equal to that of the products

Carbon

Reactant = 2 + 1 = 3

Product = 2 + 2 = 3

Hydrogen

Reactant = 3 + 1 + 1 = 5

Product = 2 + 3 = 5

Oxygen

Reactant = 2 + 3 = 5

Product = 2 +1 + 2 = 5

Sodium

Reactant = 1

Product = 1

Answer:

The reaction is already balanced because the number of atoms in the reactant is equal to the products

Explanation:

The balanced equation for the combustion of ethane, C2H6, is: C2H6 + 3O2 → 2CO2 + 3H2OTo determine how much heat is produced if 7.0 moles of ethane undergo complete combustion, we need to use the balanced equation and the standard enthalpies of formation of the reactants and products.

The standard enthalpy of formation of a compound is the enthalpy change when one mole of the compound is formed from its constituent elements, with all reactants and products in their standard states (usually at 1 atm and 25°C).The standard enthalpies of formation of the reactants and products in the combustion of ethane are:

ΔHf°(C2H6) = -84.68 kJ/mol

ΔHf°(O2) = 0 kJ/mol

ΔHf°(CO2) = -393.51 kJ/mol

ΔHf°(H2O) = -285.83 kJ/mol

Now we can calculate the heat produced by using the difference between the enthalpies of the products and reactants:

2CO2 + 3H2O - (C2H6 + 3O2)

ΔH = 2(-393.51 kJ/mol) + 3(-285.83 kJ/mol) - (-84.68 kJ/mol + 3(0 kJ/mol))

ΔH = -1560.78 kJ/mol

Therefore, if 7.0 moles of ethane undergo complete combustion, the amount of heat produced will be:

-1560.78 kJ/mol x 7.0 mol

= -10,925.46 kJ or -10,925,460 J.

Note that the negative sign indicates that heat is released by the reaction, which is exothermic.

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Out of the options listed, "Water vapor, carbon dioxide, and other volatile organic compounds (VOCs)" would not be considered a material stream exiting the roaster.

A material stream is a flow of a physical substance, such as a solid, liquid, or gas, that enters and exits a system or process. In the context of a chemical or process plant, a material stream is a stream of raw materials, intermediate products, or final products that are being produced, transported, or processed.

To perform a mass balance on a coffee roaster, you would consider all the material streams that enter and exit the system. These are gaseous emissions resulting from the roasting process and are not a physical material. The other options, "Spent coffee grounds," "Chaff," and "Roasted coffee beans" are physical materials that can be weighed and measured, and would be considered as material streams exiting the roaster.

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The annual emission of carbon (C) into the atmosphere from burning fossil fuels is equivalent to 5.4 trillion kilograms (kg) of carbon per year.

This emission occurred in the form of carbon dioxide (CO2), a greenhouse gas that contributes to climate change. Fossil fuel combustion, such as that from power plants, vehicles, and industrial processes, releases carbon stored in coal, oil, and natural gas into the atmosphere, amplifying the greenhouse effect and leading to global warming. Reducing carbon emissions is crucial for mitigating climate change and transitioning to more sustainable energy sources.

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Explanation:

I hope it helps

ya welcome