A car has a displacement of 480 km to the east in eight hours. What is its velocity in kilometers per hour?

The answer is (D) Henry Moseley. He conducted X-ray experiments on various elements and determined that each element had a unique number of protons in its nucleus, which he called the atomic number.

The atomic number or nuclear charge number of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number or the number of protons found in the nucleus of every atom of that element. The atomic number can be used to uniquely identify ordinary chemical elements.

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The composition of the sigma bonds in methane i.e. the atomic orbits comprise the molecular orbit is σsp³-sp³

Methane is a one-carbon compound in which carbon is attached to four hydrogen atoms by single bonds. It is colorless, odorless, non-toxic, but a flammable gas (bp -161°C). It serves as a fossil fuel, a member of greenhouse gases, and a bacterial metabolite. In the methane molecule, a carbon atom forms covalent bonds with four different hydrogen atoms. There are no lone pairs of electrons in carbon atoms. So the 4 hydrogen atoms are at the 4 corners of the tetrahedron and the carbon is at the center of the tetrahedron. Hybridization in the methane molecule occurs by mixing one orbital with three p-orbitals. Each orbital consists of an unpaired electron. Carbon's s orbital and three p orbitals overlap with her 1s orbital of hydrogen to form a bond. Therefore, methane hybridizes to sp3 resulting in tetrahedral geometry. The methane molecule is non-polar. In particular, the dipole moment of methane is zero. A dipole moment of zero means that the "center of negative charge" in the molecule corresponds to the "center of positive charge".

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Answer:

its 210

Explanation:

Just add all atomic mass used in the formula together: 2*(14+16*3)+88= 2*62+88=124+88=210

Hope this was helpful

The relative formula mass of strontium nitrate Sr(NO₃)₂ is 210

The relative atomic masses of N, O and Sr are 14,16 and 88 respectively.

In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. Adding the atomic masses together gives the relative formula mass of a compound

So, relative atomic mass of Sr(NO₃)₂ is calculated as

88+ 2(14+16×3) = 210

The atomic mass constant (symbol: mu) is defined as being 1/12 th of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative atomic mass.

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Answer:

Translate your language to English ok

Answer:

balance

Explanation:

Answer:

production of antibodies

Answer:

C

Explanation:

The body will start to make antibodies to rid of the "invasion".

So the answer is C

1. The equilibrium constant (Keq) is approximately 0.002 for the reaction A → B with a standard free energy change of -15 kJ/mol.

2. The actual free energy change (ΔG) for the reaction A → B is approximately -27,240 J/mol when [A] = 10 mM and [B] = 0.1 mM.

3. The standard free energy change (ΔGo') for the reaction A + B → C is approximately -10,117.23 J/mol.

1. The equilibrium constant (Keq) can be determined using the equation: ΔGo' = -RT ln(Keq), where ΔGo' is the standard free energy change, R is the gas constant (8.314 J/mol.K), and T is the temperature in Kelvin.

Given that ΔGo' = -15 kJ/mol, we need to convert it to Joules by multiplying by 1000:

ΔGo' = -15 kJ/mol = -15,000 J/mol.

Assuming the temperature is 310 K, we can calculate Keq as follows:

ΔGo' = -RT ln(Keq)

-15,000 J/mol = -(8.314 J/mol.K)(310 K) ln(Keq)

Simplifying the equation:

ln(Keq) = -15,000 J/mol / (8.314 J/mol.K * 310 K)

ln(Keq) ≈ -5.97

Taking the exponential of both sides:

Keq ≈ e^(-5.97)

Calculating Keq:

Keq ≈ 0.002

Therefore, the equilibrium constant (Keq) for the reaction A → B is approximately 0.002.

2. To determine the actual free energy change (ΔG) for the reaction A → B, we can use the equation: ΔG = ΔGo' + RT ln(Keq), where ΔG is the overall free energy change, R is the gas constant (8.314 J/mol.K), T is the temperature in Kelvin, and Keq is the equilibrium constant.

Given that [A] = 10 mM and [B] = 0.1 mM, we can calculate the actual free energy change as follows:

ΔG = -15,000 J/mol + (8.314 J/mol.K)(310 K) ln(0.1/10)

Simplifying the equation:

ΔG ≈ -15,000 J/mol + (8.314 J/mol.K)(310 K) ln(0.01)

Calculating ΔG:

ΔG ≈ -15,000 J/mol + (8.314 J/mol.K)(310 K)(-4.605)

ΔG ≈ -15,000 J/mol - 12,240 J/mol

ΔG ≈ -27,240 J/mol

Therefore, the actual free energy change (ΔG) for the reaction A → B, when [A] = 10 mM and [B] = 0.1 mM, is approximately -27,240 J/mol.

3. To calculate the standard free energy change (ΔGo') for the reaction A + B → C, we can use the equation: ΔGo' = -RT ln(Keq), where ΔGo' is the standard free energy change, R is the gas constant (8.314 J/mol.K), T is the temperature in Kelvin, and Keq is the equilibrium constant.

Given the concentrations at equilibrium: [A] = 2 mM, [B] = 3 mM, and [C] = 9 mM, we can calculate the standard free energy change as follows:

First, let's calculate the ratio of products to reactants based on their concentrations:

[A] = 2 mM, [B] = 3 mM, and [C] = 9 mM

Keq = ([C]^coefficient[C] * [A]^coefficient[A] * [B]^coefficient[B]) / ([A]^coefficient[A] * [B]^coefficient[B])

Keq = (9^1 * 2^0 * 3^0) / (2^1 * 3^1)

Keq = 9 / 6

Keq = 1.5

Now, we can calculate ΔGo' using the equation:

ΔGo' = -RT ln(Keq)

Assuming the temperature is 310 K, and using the gas constant R = 8.314 J/mol.K:

ΔGo' = -(8.314 J/mol.K)(310 K) ln(1.5)

Calculating ΔGo':

ΔGo' ≈ -(8.314 J/mol.K)(310 K)(0.405)

ΔGo' ≈ -10,117.23 J/mol

Therefore, the standard free energy change (ΔGo') for the reaction A + B → C, when the concentrations are [A] = 2 mM, [B] = 3 mM, and [C] = 9 mM, is approximately -10,117.23 J/mol.

1. The equilibrium constant (Keq) is approximately 0.002 for the reaction A → B with a standard free energy change of -15 kJ/mol.

2. The actual free energy change (ΔG) for the reaction A → B is approximately -27,240 J/mol when [A] = 10 mM and [B] = 0.1 mM.

3. The standard free energy change (ΔGo') for the reaction A + B → C is approximately -10,117.23 J/mol.

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Answer:

pH>7

sour taste

donate H+ ions

turn litmus paper from blue to red

Explanation:

Answer:

Explanation:

   pH < 7.

   Sour taste (though you should never use this characteristic to identify an acid in the lab)

   Reacts with a metal to form hydrogen gas.

   Increases the H+ concentration in water.

   Donates H+ ions.

   Turns blue litmus indicator red.

Sea Arches are formed when a cave continues to be eroded and expanded until it cuts through a headland.

A sea cave forms when a sea arch pursues to be eroded and widened until the rock becomes too weak to carry the roof of the sea cave and collapses into the sea. Caves are devised by the dissolution of limestone. Rainwater collects carbon dioxide from the air and as it percolates through the soil, which rotates into a weak acid.

Sea caves occur on almost every precipice headland or coast where the waves break straight on a rock cliff and are formed Sea caves by mechanical erosion rather than the chemical solution procedure that is responsible for the majority of inland caves.

So we can conclude that Sea caves or littoral caves are formed fundamentally from erosion caused by waves

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Answer:

V = 25.7 L.  

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve for the volume of hydrogen, by firstly calculating the moles of this gas produced by 37.6 g of magnesium, according to the 1:1 mole ratio between them:

\(n_{H_2}=37.6gMg*\frac{1molMg}{24.305gMg}*\frac{1molH_2}{1molMg}=1.55molH_2\)

Now, we use the ideal gas equation:

\(PV=nRT\)

To solve for the volume, and obtain:

\(V=\frac{nRT}{P}\\\\V=\frac{1.55mol*0.08206\frac{atm*L}{mol*K}*293.15K}{1.45atm}\\\\V=25.7L\)

Regards!

Answer:

They need to use energy from other tress to survive so that they can do basic functions, like absorbing nutrients from the ground, and growing back leaves. They don't have chlorophyll, so they need that energy to do the functions I mentioned above.

Explanation: Hope this helps!

Answer:

Trees need chlorophyll to make energy. Because albino trees don’t have chlorophyll, they can’t create their own energy. So, they must take energy from other trees to survive.

Explanation:

Answer:

Kinetic energy to mechanical energy, and mechanical energy to electrical energy.

Explanation:

From the Law of conservation of Energy, which state that energy can neither be created nor destroyed but can be transformed from one form to another. Energy transformation is essential in science and technology, in the process of generating electricity from dams and nuclear power plants

some of the energy transformations are the same, the energy transformations occur in both dams and nuclear power plants is Kinetic energy to mechanical energy, and mechanical energy to electrical energy. Kinectic energy is the energy in motion which means the dams is a running water and posses a Kinectic energy then it's is been convert to mechanical energy (which is the macroscopic energy) then to electrical energy by producing light.

Answer:

Explanation:

Kinetic energy to mechanical and mechanical to electrical

1. The filter paper can get clogged when the pores of the paper get filled with precipitate

2. While the filter paper getting clogged is not necessarily a human error, it can be a result of poor technique or improper preparation

Uneven surfaces or gaps in the filter paper caused by improper folding or fitting can let ppt get through and pollute the filtrate. The mixture being filtered can have more tiny particles that can clog the paper if it is not properly prepared or given time to settle.

Overall, even though filter paper clogging is a common problem in filtration, using the right method and getting ready can help reduce the risk and guarantee accurate results.

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B is the answer ,ammonium accepts a proton and becomes ammonium ion

Answer:

\(The \: metric \: system \: uses \: one \: unit \: for \: each \: \\ category \: of \: measurement. \)

Answer:

in the modern periodic table elements are raised according to increasing atomic number

The measure of the energy in any EM waves is electron volts (eV).

The Electromagnetic waves (EM waves) are the waves that are made up of both electric and magnetic fields that oscillates around a field.

The electromagnetic wave can be measured in electron volts (eV) because is can be described in terms of its energy—in units of measure.

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Explanation:

27.0*C OPTION . GLAD IT HELPS

The pressure of a 1.50-mole sample of He in a 2.25-L container at 298 K, assuming non-ideal behavior with a compressibility factor of Z = 1.2, is 4.39 atm.

The equation of state for a fictitious ideal gas is known as the ideal gas law. Although it has significant drawbacks, it is a good approximation of the behaviour of several gases under various conditions.

To solve this problem, we can use the ideal gas law with a correction factor for non-ideal behavior, known as the compressibility factor, Z. The compressibility factor accounts for the deviation of real gases from ideal behavior due to intermolecular forces, finite molecular size, and other factors. The compressibility factor, Z, is defined as the ratio of the actual molar volume of a gas to its molar volume as predicted by the ideal gas law.

The compressibility factor can be expressed as:

Z = PV/RT

where P is the pressure, V is the volume, R is the gas constant, and T is the temperature.

For He gas at 298 K, we can assume a compressibility factor of Z = 1.2 based on experimental data.

So, we can rearrange the ideal gas law with the compressibility factor to solve for the pressure:

P = Z nRT/V

where n is the number of moles of gas.

Substituting the given values, we get:

P = (1.2)(1.50 mol)(0.08206 L·atm/mol·K)(298 K)/(2.25 L)

P = 4.39 atm

Therefore, the pressure of a 1.50-mole sample of He in a 2.25-L container at 298 K, assuming non-ideal behavior with a compressibility factor of Z = 1.2, is 4.39 atm.

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In a neutralization reaction involving an acid and a base, one of the products is always water.

Neutralization reactions occur when an acid reacts with a base, resulting in the formation of a salt and water. The acid donates a proton (H+) to the base, which accepts the proton. The combination of the positively charged hydrogen ion (H+) from the acid and the negatively charged hydroxide ion (OH-) from the base forms water (H2O). This water molecule is a byproduct of the neutralization reaction. The salt formed in the reaction depends on the specific acid and base involved. For example, if hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the salt formed is sodium chloride (NaCl).

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Answer:

1) petroleum, mixture, not found on periodic table

2) hydrogen and helium, mixture, contains "and"

3) iron sulphide, compound, ends with "ide"

4) carbon dioxide, compound, ends with "ide"

5) salt water, mixture, not found on periodic table

6) milk and sugar, mixture, contains "and"

7) silver nitrate, compound, ends with "ate"

8) sodium carbonate, compound, ends with "ate"

9) carbon electrode, mixture, not found on periodic table

10) astatine, element, found on periodic table

11) argon, element, found on periodic table

12) oxidane, compound, contains "ane"

13) iron and sulphur, mixture, contains "and"

14) methane, compound, contains "ane"

Explanation:

Answer:

The correct response is "9.313 M".

Explanation:

According to the question, the values are:

Moles of solute,

= 0.57 moles

Liters of solution,

=  61.2 mL

or,

= 0.0612 L

Now,

The molarity will be:

= \(\frac{Moles \ of \ solute}{Liters \ of \ solution}\)

On putting the given the values in the above formula, we get

= \(\frac{0.57}{0.0612}\)

= \(9.313 \ M\)

The temperature in a bar of silver of length 10 cm and constant cross-section is 50°C after 500 seconds.

According to the given question, Length of silver bar, L = 10 cm, Area of cross-section of the bar, A = 1 cm2, Density of silver, ρ = 10.6 g/cm3, Specific heat of silver, c = 0.056 cal/(g °C), Thermal conductivity of silver, K = 1.04 cal/(cm sec °C), Temperature of the silver bar at time t = 0, u(x, 0) = f(x) = 0°C, Temperature of the left end of the bar (x = 0) is 100°C, and temperature of the right end of the bar (x = L) is 0°C.

Now, we can find the temperature of the bar using the formula for the heat equation. The heat equation can be written as: where u(x, t) is the temperature of the bar at position x and time t. Now, let's find the values of the constants: We can use the formula for the temperature distribution to find the temperature of the bar after 500 seconds. Substituting the values in the formula, we get: The temperature in a bar of silver of length 10 cm and constant cross-section is 50°C after 500 seconds.

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Remove dry chemicals.Remove contaminated clothing or jewelry. Bandage the burn. Rinse again if needed.

the amount of harm to the skin relies upon on how strong the chemical was, how lots of it become at the skin, and how long it become there. Chemical burns, even minor ones, can be very painful. A minor burn may heal inside a few days. however a extra extreme burn might also take weeks or maybe months to heal completely.you need to now not use ice, or even ice-bloodless water, on a burn. extreme cold carried out to a burn can further damage the tissue. to properly cool and clean a burn, remove any apparel that covers it.

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The change in entropy of the gas is 27.6 J/K.

Entropy of a gas:

Entropy of a gas is the measure of the disorder or randomness of the particles in a system. The second law of thermodynamics states that in an isolated system, the total entropy will always increase over time, indicating that the disorder of a system will always increase if it is left alone.

A diatomic ideal gas begins at a volume of 1.91 m3, a pressure of 105 kPa and a temperature of 21oC. It undergoes a constant volume process that triples its temperature. The change in entropy of the gas is J/K.

The relationship between entropy and temperature is given by:

\($$\Delta S = nC_{v}ln\frac{T_{2}}{T_{1}}$$\)

Where , ΔS is the change in entropy of the gas,

n is the number of moles of the gas,

Cv is the heat capacity at constant volume,

T2 is the final temperature of the gas and

T1 is the initial temperature of the gas.

Since the gas is diatomic, its heat capacity is given by:

Cv = 5/2R  where R is the ideal gas constant.

Therefore, the change in entropy of the gas is:

\($$\Delta S = nC_{v}ln\frac{T_{2}}{T_{1}}$$\)

\($$\Delta S = n(\frac{5}{2}R)ln\frac{T_{2}}{T_{1}}$$\)

\($$\Delta S = (\frac{5}{2})(8.31)ln\frac{3T_{1}}{T_{1}+273}$$\)

At a temperature of 21oC, the initial temperature of the gas is:T1 = 21 + 273 = 294 K.

Substituting T1 into the equation gives:

\($$\Delta S = (\frac{5}{2})(8.31)ln\frac{3(294)}{294+273}$$\)

\($$\Delta S = 27.6 J/K$$.\)

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Invented by Bernard Launy and Jeremie Metz, flaws in the system in terms of energy inputs and outputs is the overbalanced wheel in which spokes are attached

Energy is the ability to do work to cause changes in matter

The overbalanced wheel perpetual motion machine is one of the most commonly proposed perpetual motion machine designed and wheel is designed to turn clockwise just after the weighted spoke reaches the top of the wheel and the spoke flip outward to the right exerting the force downward toward the ground and some energy will be lost from friction as the mechanism rub on the inner spoke and more energy will be lost when it transferred into sound and thermal energy

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Answer: 3.2

Explanation:

In the given redox reaction 2 Sr + O2 → 2 SrO, the reducing agent is the species that undergoes oxidation, meaning it loses electrons.

In this reaction, Sr goes from an oxidation state of 0 to +2 in SrO, gaining two electrons. Oxygen (O) goes from an oxidation state of 0 to -2 in SrO, gaining two electrons.

Therefore, the correct answer is:

D. Sr is the reducing agent, with an oxidation change from 0 to -2.

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The law of mass action best fits that the law of mass action is a model that emphasizes the energy and orientation of molecular collisions to explain and predict reaction kinetics.

The relationship between concentrations of reactants and products in a chemical reaction at equilibrium is described by the law of mass action, which is a fundamental concept in chemistry. According to this, the rate of a chemical reaction is inversely related to the product of the reactant concentrations, where each reactant concentration is increased to a power equal to its coefficient in the balanced chemical equation.

This rule also serves as the foundation for a kinetic model that forecasts the speeds of chemical reactions by taking into account the energy and orientation of molecular collisions. It aids in the explanation of how temperature, concentration, and other variables affect response speeds.

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