these transformations can be achieved by the irradiation of azonaphthalene solutions with uv-vis light of appropriate wavelength.

Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.

The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.

This model is  often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.

The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.

Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

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Answer: The correct statements about thermal conductivity are:

Explanation:

The rate at which transfer of heat takes place from one object to another by conduction over a unit cross section area of a material is called thermal conductivity.

Hence, more is the distance between atoms of a substance less will be its thermal conductivity. This is because more is the space between molecules of a substance more will be their random motion due to which there will be less effective energy transport.

The thermal conductivity of metals is very high than liquids.

Also, the thermal conductivity of solids is generally higher than that of liquids.

As gases have more space between its molecules so they have less thermal conductivity.

Thus, we can conclude that the correct statements about thermal conductivity are:

water is watching over you

Answer:

it means the higher the water content in the air, the more moderate (less extreme) the climate is.

Answer:

fluorine is the most electronegative element

Answer:

Their atoms obey the octet rule

Explanation:

Chemical compounds are formed when atoms combine with one another in order to comply with the octet rule. The octet configuration gives an atom stability in electronic structure.

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

well gravity

Explanation:

gravity pull everything to earth

Answer:

80 ml.

Explanation:

The balanced equation is:

KOH + HNO3 ---->  KNO3 + H2O

So 1 mole of KOH reacts with 1 mole of HNO3

200ml of 0.16M KOH contains 0.16 * 200/1000

= 0.16 * 0.2

= 0.032 M KOH.

So we need the volume (V) of 0.4 M HNO3 which contains 0.032 moles.

0.4 * V = 0.032

V = 0.032 / 0.4

V = 0.08 liters

= 80 mls.

If the efficiency of a machine increases, it means that the machine is able to convert a higher percentage of its input energy into useful work output.

This could happen due to various factors, such as reducing friction, improving the design of the machine, or using more efficient components. The machine requires less energy input to perform the same amount of work. This could result in cost savings, reduced energy consumption, and lower environmental impact.

The output of the machine increases while the input remains constant. This could result in increased productivity, faster production rates, and improved performance. The wear and tear on the machine may decrease, as it is working more efficiently and experiencing less stress. This could result in longer machine life and reduced maintenance costs. Increasing the efficiency of a machine can have many positive effects, including cost savings, improved performance, and reduced environmental impact.

The complete question is

If the efficiency of a machine increases, what happen?

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The ideal gas law may be used to determine the volume of oxygen created in the electrolysis that produces 548 litres of hydrogen at STP (Standard Temperature and Pressure). 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, according to the ideal gas equation.

The pressure is 1 atm, the temperature is 273 K, and the number of moles of hydrogen is 548/22.4 = 24.5 in this example. We may compute the volume of oxygen created by rearranging the ideal gas law: V = nRT/P = 24.5*0.082*273/1 = 483.3 litres.

As a result, the volume of oxygen created in the electrolysis at STP that produces 548 litres of hydrogen is 483.3 litres.

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The carbon-to-selenium bond is nonpolar covalent.

If the electronegativity of two elements is the same, the bond between them is nonpolar. The shared electrons of a bond will be found equally far from the nuclei of the two atoms since neither atom has a particularly strong inclination to bring the electrons of a bond towards itself. The electronegativity of an atom is a measurement of its capacity to attract shared electrons to itself. On the periodic table, electronegativity usually increases from left to right throughout a period and decreases as you move down a group. The bigger an atom's electronegativity, the more strongly it will draw electrons from its bonds.

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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The balanced half-reaction equation for the reduction of Pb2+ ions to lead metal is:

Pb2+ + 2e- → Pb

According to this equation, 2 electrons are required to reduce 1 Pb2+ ion to lead metal.

The molar mass of lead (Pb) is 207.2 g/mol, so the mass of 1 mole of lead is 207.2 g. Therefore, the mass of 0.299 g of lead is:

0.299 g / (207.2 g/mol) = 0.00144 mol

To deposit this amount of lead, we need to transfer 0.00144 mol of Pb2+ ions to lead metal. This requires the transfer of 2 x 0.00144 = 0.00288 moles of electrons.

The amount of electric charge required to transfer 0.00288 moles of electrons is:

Q = n x F = 0.00288 mol x 2 x 96,485.3329 C/mol = 557.4 C

where n is the number of moles of electrons transferred and F is the Faraday constant.

The amount of time required to deposit this amount of lead at a current of 0.627 A is given by the equation:

Q = I x t

where Q is the electric charge in coulombs, I is the current in amperes, and t is the time in seconds. Solving for t, we get:

t = Q / I = 557.4 C / 0.627 A = 888.9 seconds

Therefore, it would take approximately 888.9 seconds (or about 14.8 minutes) to deposit 0.299 g of lead metal from a solution containing Pb2+ ions at a current of 0.627 A.

Answer:

the answer is a          shh /..\  yall smell that

Explanation:

Answer:

Because these exchange particles are so heavy, particles feel the weak force only on very short ranges—within atomic nuclei. The strong force, too, operates only on short ranges. But gravity, which theorists believe is carried by particles called gravitons traveling at the speed of light, is a long-range force.

Explanation:

Answer:

Explanation:

Because these exchange particles are so heavy, particles feel the weak force only on very short ranges—within atomic nuclei. The strong force, too, operates only on short ranges. But gravity, which theorists believe is carried by particles called gravitons traveling at the speed of light, is a long-range force.

The index of hydrogen deficiency (IDH or HDI) for the compound having a molecular formula C-H-Br₂O is 3. The corrct option is a.

The index of hydrogen deficiency (IHD) or the degree of unsaturation is the measure of the number of rings or the multiple bonds in the molecule. The expression is as :

IHD = (2n + 2) - (h + x)/2

Where n is the number of the carbons,

The h is the number of the hydrogens,

The x is the number of the heteroatoms like as the O, N, S, etc. in the molecule.

For the molecular formula C-H-Br₂O, we have:

n = 1

h = 1

x = 3

Now, we have :

IHD = (2(1) + 2) - (1 + 3)/2

IHD = 3

Therefore, the correct option is a.

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Based on the data shown in the graph, the rate of reaction is directly proportional to the temperature of a reaction.

The speed at which a chemical reaction occurs is called the reaction rate or rate of reaction. The rate of a reaction is proportional to the increase in product concentration per unit time and the decrease in reactant concentration per unit time.

The rate of a reaction is affected by the following:

the temperature of the reaction - the rate of reaction is directly proportional to the temperature of a reaction. Hence, the rate of a reaction increases with an increase in temperature.

presence of a catalyst - the rate of a reaction increases with the addition of a catalyst. A catalyst speeds up the rate of a reaction.

the surface area of the reactants - the rate of a reaction increases with an increase in the surface area of the reactants,

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Answer:

At higher temperatures, chemical reactions occur more quickly.

Explanation:

edmentum

The concentration of the iodide ions is obtained as 4.75 * 10^-4 M.

We know that the concentration has to do with the amount of substance that is in the solution. In this case, we have been told that n 38.0 mL of 0.1250 M sulfuric acid is added to 100 mL of a solution of lead II iodide a lead II sulfate precipitate is formed and when filtered we obtain 0.0471 g of the filtrate and we want to find the concentration of the iodide ions in the original solution.

We must look to the balanced reaction equation as well as the stoichiometry of the reaction as we know it in this case.

Number of moles = volume * concentration of solution

Number of moles of sulfuric acid = 38/1000 L *  0.1250 M

= 4.75 * 10^-5 moles

Now we know that the reaction is 1:1 so;

Number of moles = volume * concentration of solution

concentration of solution = Number of moles/ volume

= 4.75 * 10^-5 moles/100 * 10^-3 L

= 4.75 * 10^-4 M

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Answer:

It transports heat from warm places to cool places, causing the body to maintain a more even temperature.

Explanation:

I hope I helped ^-^

Answer:

Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.

Hope its helpful!

Minerals are inorganic solids that develop in nature and have a crystalline structure as well as a specific spectrum of chemical formulas. Ores are areas of mineral concentration in rock that may be economically mined for use. Lodestone is one of the iron ores. The mineral known as ore is where metal is easily and affordably mined. The composition of ore is known. Minerals are naturally occurring metals that are found in the crust of the planet. Ores are minerals that can be utilized to profitably extract metal.

A (they are experimentally determined exponents)

Answer:

i think is  D

Explanat

bc i got it right

Two solutions are mixed and react to produce the solid precipitate AgCl, then the mass remains constant.

The law of conservation of mass, also known as the principle of mass conservation, asserts that the mass of any system closed to all transfers of matter and energy must remain constant over time.

Since the mass of the system cannot change, and hence quantity cannot be added or removed. In the given reaction when we add two solutions then the mass of the mixture does not changes.

Hence, mass remains constant.

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1. For the pair of half-reactions:

Pt2+(aq) + 2e- → Pt(s)    ... (1)

Sn2+(aq) + 2e- → Sn(s)    ... (2)

To obtain the balanced equation for the overall cell reaction, we need to multiply the half-reactions by appropriate coefficients to ensure that the number of electrons transferred is equal. In this case, we can multiply equation (1) by 2 and equation (2) by 1:

2(Pt2+(aq) + 2e-) → 2(Pt(s))

Sn2+(aq) + 2e- → Sn(s)

Combining the equations, we have:

2Pt2+(aq) + Sn2+(aq) → 2Pt(s) + Sn(s)

The cell notation for this reaction is:

Pt2+(aq) | Pt(s) || Sn2+(aq) | Sn(s)

To calculate the standard cell potential (E°), we need to know the standard reduction potentials for Pt2+/Pt(s) and Sn2+/Sn(s) half-reactions. Referring to standard reduction potential tables, we find:

E°(Pt2+/Pt(s)) = +1.20 V

E°(Sn2+/Sn(s)) = -0.14 V

The overall cell potential (E°cell) is the difference between the reduction potentials:

E°cell = E°(cathode) - E°(anode) = 0.00 V - (-0.14 V) = +0.14 V

Therefore, the standard cell potential for this reaction is +0.14 V.

2. For the pair of half-reactions:

Co2+(aq) + 2e- → Co(s)    ... (3)

Cr3+(aq) + 3e- → Cr(s)    ... (4)

To balance the number of electrons transferred, equation (4) can be multiplied by 2:

2(Co2+(aq) + 2e-) → 2(Co(s))

Cr3+(aq) + 3e- → Cr(s)

Combining the equations, we have:

2Co2+(aq) + Cr3+(aq) → 2Co(s) + Cr(s)

The cell notation for this reaction is:

Co2+(aq) | Co(s) || Cr3+(aq) | Cr(s)

To calculate the standard cell potential (E°), we refer to the standard reduction potentials:

E°(Co2+/Co(s)) = -0.28 V

E°(Cr3+/Cr(s)) = -0.74 V

The overall cell potential (E°cell) is the difference between the reduction potentials:

E°cell = E°(cathode) - E°(anode) = -0.74 V - (-0.28 V) = -0.46 V

Therefore, the standard cell potential for this reaction is -0.46 V.

3. For the pair of half-reactions:

Hg2+(aq) + 2e- → Hg (l)    ... (5)

Cr2+(aq) + 2e- → Cr(s)    ... (6)

The equation for the overall cell reaction can be obtained by multiplying equation (6) by 2:

2(Hg2+(aq) + 2e-) → 2(Hg (l))

Cr2+(aq) + 2e- → Cr(s)

Combining the equations, we have:

2Hg2+(aq) + Cr2+(aq) → 2Hg (l) + Cr(s)

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Answer: Hello Luv.......

Find the pH of a 0.0025 M HCl solution. ... The hydronium ion concentration can be found from the pH by the reverse of the ... 8.34 = - log [H3O+].

Explanation:

Calculate the pH of the solutions below. 1. ... a) [H+] = 1.0 x 102 M OH-]= 1 x 10-2M aad ... What is the pH of a 7.98 x 10-2 M solution of HNO3 (nitric acid). ... Find the hydronium ion concentration [H3O+] from the pH of the following solutions.

Hope this helps. Sorry if wrong.

Mark me brainest please.

Anna ♥

Answer:

2.5 mol/L

Explanation:

We'll begin by calculating the number of mole in 7 g of KOH. This can be obtained as follow:

Mass of KOH = 7 g

Molar mass of KOH = 39 + 16 + 1

= 56 g/mol

Mole of KOH =?

Mole = mass /molar mass

Mole of KOH = 7 / 56

Mole of KOH = 0.125 mole

Next, we shall convert 50 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

50 mL = 50 mL × 1 L / 1000 mL

50 mL = 0.05 L

Finally, we shall determine the molarity of the KOH solution. This can be obtained as follow:

Mole of KOH = 0.125 mole

Volume = 0.05 L

Molarity of KOH =?

Molarity = mole / Volume

Molarity of KOH = 0.125 / 0.05

Molarity of KOH = 2.5 mol/L

Thus, the molarity of the KOH solution is 2.5 mol/L