hydrogen decomposes quickly when exposed to light. the reaction for decomposing hydrogen peroxide is:

The amount of aluminum that can be formed by the passage of 305 C (coulombs) through an electrolytic cell containing a molten aluminum salt is 0.0286 g

Faraday's law of electrolysis states that the amount of substance produced during electrolysis is directly proportional to the amount of electricity passed through the cell. The relationship can be expressed by the equation:

moles of substance = (current in amperes x time in seconds) / (Faraday's constant x charge on one mole of the substance)

where Faraday's constant is 96,485.3 C/mol and the charge on one mole of aluminum is 3 x 96500 C (since aluminum has a 3+ charge in the electrolyte). To find the mass of aluminum produced, we need to first calculate the number of moles of aluminum produced, and then multiply by its molar mass (27 g/mol).

So, the number of moles of aluminum produced is:

moles of aluminum = (305 C / (3 x 96500 C/mol)) x (1 A / 1 C) x (1 s / 1 s)

moles of aluminum = 0.001059 mol

Finally, the mass of aluminum produced can be calculated by multiplying the number of moles by the molar mass:

mass of aluminum = 0.001059 mol x 27 g/mol

mass of aluminum = 0.0286 g

Therefore, approximately 0.0286 grams of aluminum can be formed by the passage of 305 C through an electrolytic cell containing a molten aluminum salt.

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Natural selection is a process in which organisms that are better adapted to their environment tend to survive and produce more offspring. These offspring are likely to inherit the traits that made their parents successful, which can lead to predominance and suppression of certain traits in a population.

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Answer:

128gCaCl2 per 200gH2O

Explanation:

I might be wrong rlly srry if I am:/ Hope this helps doe have a wonderful day

Answer:

porcelain is more fragile

Explanation:

Answer:

the last one: all three are examples of Newton's laws

Explanation:

i guess

When we convert 135 grams of potassium chloride, KCl to mole, the result obtained is 1.81 moles

To convert mass (in grams) to mole, we must understand that mole and mass are related according to the following formula:

Mole = mass / molar mass

Applying the above formula, we can successfully convert 135 grams of KCl to mole as shown below:

Mole = mass / molar mass

Mole of potassium chloride, KCl = 135 / 74.5

Mole of potassium chloride, KCl = 1.81 moles

Thus, we can conclude that 135 grams of KCl is equivalent to 1.81 moles

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Solid Lead II carbonate can not conduct electricity because it is insoluble in water.

First of all, we must establish the fact that ionic solids conduct electricity in solution because they can be broken up into ions in solution.

In the solid state, they do not conduct electricity because the ions are strongly bound by electrostatic forces.

However, if an ionic substance is insoluble in water, its ions are not available to conduct electricity since ions are the charge carrier in solution. As a result of this, such a substance will not conduct electricity.

Since Lead II carbonate is insoluble in water, its ions are not available hence the substance does not conduct electricity.

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Answer: The stage of metamorphosis this occurs is called the PUPA stage. The correct option is D.

Explanation:

Metamorphosis can be defined as the change in form, mode of life and behaviour that occurs during embryonic development of an organism. In the metamorphosis of insects, which mostly reproduce sexually, insects can be grouped according to the way the eggs develop into adults. Some show:

--> Complete metamorphosis or

--> Incomplete metamorphosis.

In the life cycle of a butterfly, a COMPLETE metamorphosis occurs. This is because after fertilization, the EGG hatches into LARVA which passes through a PUPAL stage before becoming transformed into an ADULT insect. That is:

Egg --> Larva --> Pupa --> Imago.

When the caterpillar, which is the Larva stage, has reached its full size, it spins a pad of silk on a twig. It moves upward and attached it's clasper to this pad. It spin another silk thread at the thorax. These aids it to assume a slanting position with the head end pointing upwards. The pupa stage called the CHRYSALIS is reached when it tucks it's head under its thorax, arches it's body, shortens and broadens, and moults for the last time. Therefore the correct option is D (pupa).

Answer:

The answer is D. Pupa

The normal direction for current and magnetic field in the battery with the floodlight is from the positive terminal (anode) to the negative terminal (cathode).

Conventionally, a positive charge would go in the same direction as an electric current. As a result, the battery's positive terminal receives less current in the external circuit than its negative counterpart.

The positive charge in the battery or cell moves from the negative terminal, which has a lower potential, to the positive terminal, which has a higher potential. While in an external circuit, the battery's positive terminal transfers its positive charge to the negative terminal.

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At the freezing point, the liquid form of a substance is in equilibrium with

the solid form of the substance.

It is approximately the same temperature between the freezing and melting points. At 0 degrees Celsius, liquid water freezes and solid ice melts. When a phase transition takes place from liquid to solid or solid to liquid, temperature doesn't change.

Freezing. The average energy of the molecules in a liquid drops as it cools. It is a condition of equilibrium between opposing forces or actions that can be static as when forces act on a body and the resultant is zero or dynamic, such in a chemical reaction that is reversible and has equal rates of reaction in both directions.

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Given the data from the question, the sample of the glucose contain 6.04×10²¹ atoms of hydrogen

1 mole of substance = 6.02×10²³ atoms

From the formula of glucose, C₆H₁₂O₆, we can see that the mole ratio of carbon to hydrogen is:

Ratio = carbon / hyddrogen

Ratio = 6 / 12

Thus, for every 6 moles of carbon, there are 12 moles of hydrogen.

Thus, we can determine the number of atoms of hydrogen present in the compound as follow:

6 moles of carbon = 12 moles of hydrogen.

Therefore,

3.02×10²¹ atoms of carbon = (3.02×10²¹ × 12) / 6

3.02×10²¹ atoms of carbon = 6.04×10²¹ atoms of hydrogen

Thus, the number of atoms of hydrogen present in the compound is 6.04×10²¹ atoms

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The negatively charged subatomic particle is located in the electron cloud or electron shell of an atom.

Electrons are negatively charged subatomic particles that are found outside of the atomic nucleus. They orbit around the nucleus in shells or energy levels that are at various distances from the nucleus. These shells can be thought of as being similar to the different orbits of planets around the sun.

Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, which is the dense, positively charged center of the atom. Electrons, on the other hand, are found outside of the nucleus and have a negative charge. They orbit around the nucleus in shells or energy levels that are at various distances from the nucleus. These shells can be thought of as being similar to the different orbits of planets around the sun.

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The bond enthalpy of the N-N triple bond is 418kj/mol. The correct statement about the N2 molecule is correct is that It requires less energy to break the bonds in molecule A than it does in molecule B.

A molecule is described as a group of two or more atoms held together by attractive forces known as chemical bonds

In chemistry, bond energy (E) or bond enthalpy (H) is the measure of bond strength in a chemical bond which means that the higher the bond enthalpy, the more energy is needed to break the bond and the stronger the bond.

The lower the bond enthalpy, the lesser energy is needed to break the bond and the weaker the bond.

So we can say that the e correct option is A. Since A has a lower energy value compared to B, it would take a lesser amount of energy to break the bonds in A.

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#completye question:

The bond enthalpy of the N-N triple bond is 418kj/mol. Which statement about the N2 molecule is correct?​

A. It requires less energy to break the bonds in molecule A than it does in molecule B.

B.It requires more energy to break the bonds in molecule A than it does in molecule B.

C. Molecule A is more stable than molecule B.

D. Molecule A has stronger bonds than molecule B.

Cooking any food.

Burning of wood.

Digestion of food.

Acid-base reaction.

Answer:

In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.

They share electrons between them

When the negatively charged metal ball comes in contact with the iron bar, the positive charges of the bar aligns near to the negative charges and they electrostatically attracts results in a static electricity.

When a negatively charged body is comes in contact with an conductor or an insulator, the random charges gets polarized, where the positive charges of the second object align with the negative charges and there occurs a flow of electron from the negatively charged object. This is called static electricity.

A metal in its neutral state contains a sea of positive ions and free electrons. Here, the when the negatively charged metal ball comes near the iron bar, the iron bar gets polarized.

The positive charges of the iron bar gets polarized near the negative charge of the ball and there occurs an electrostatic force of attraction. Electrons from the negative charged ball tends to flow to the conductive iron bar and leads to a static electricity.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

The initial volume of the container can be calculated using the ideal gas formula, PV = nRT, where P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature:

The best illustration of Avogadro's law is when a balloon is inflated. The volume of the balloon grows as you add moles of gas. Similar to how a balloon loses gas and its volume as you collapse it

According to Avogadro's law, all gases with an identical volume and the same temperature and pressure have an equal number of molecules. The volume of an ideal gas at a certain mass.

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Given that the reaction A — → Products is second-order with respect to A. We need to determine the true statements among the given statements. When [A] doubles, the rate quadruples. This is true because the rate of a second-order reaction varies directly as the square of the concentration of the reactant. The correct options are options (A) and (B).

Therefore, when the concentration of A doubles, the rate of the reaction will be four times. The plot of [A]2 versus time gives a straight line with slope +k. This statement is true. The slope of the plot of [A]2 versus time gives a straight line with slope +k. This is because the rate constant is

k = slope/intercept.

A plot of [A] versus time gives a straight line with slope – k.

This statement is not true.

The plot of [A] versus time gives a straight line with slope –k.

This is because the rate constant is

k = -slope/intercept.

A plot of [A]– versus time gives a straight line with slope +k.

This statement is not true because the reaction is second-order with respect to A, not first-order with respect to A.

The plot of [A]– versus time gives a straight line with slope -k.

None of the statements above are true.

This statement is not true as the first and the second statement is correct, hence option (E) is incorrect.

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The key differences between pneumatic and hydraulic systems are:

The fluid used: Pneumatic systems use air as the fluid, while hydraulic systems use a liquid such as oil.

The transmission of power: In pneumatic systems, power is transmitted through the movement of air, while in hydraulic systems, power is transmitted through the movement of a pressurized liquid.

The types of forces involved: Pneumatic systems typically involve forces that are relatively low in magnitude but high in speed, while hydraulic systems involve forces that are high in magnitude but low in speed.

Pascal's Law states that the pressure applied to a confined fluid is transmitted undiminished in all directions and acts with equal force on equal areas. An example of a household item that applies Pascal's Law is a hydraulic jack, which uses a confined fluid (usually oil) to transmit pressure and lift heavy objects. When the handle of the jack is pressed down, the pressure of the fluid is increased and transmitted through the system, causing the lift arm to rise.

Advantages of pneumatic systems:

They are relatively simple and easy to maintain.

They are energy efficient, as air is a readily available and inexpensive fluid.

They are safe to use, as there is no risk of explosions or fires.

Disadvantages of pneumatic systems:

They are limited in their power transmission capabilities, as the forces generated by pneumatic systems are typically lower than those generated by hydraulic systems.

They are not suitable for use in high-pressure or high-temperature applications.

They are prone to leakage, as air can escape through small openings.

Examples of pneumatic systems:

Air compressors

Pneumatic tools such as hammers and drills

Automatic doors in buildings

Advantages of hydraulic systems:

They can transmit large amounts of power with relatively small amounts of force.

They are able to generate high pressures, making them suitable for use in a wide range of applications.

They are relatively simple and easy to maintain.

Disadvantages of hydraulic systems:

They require a separate power source to operate, such as an electric motor or gasoline engine.

They can be expensive to repair if they fail or leak.

They can be hazardous to use, as the fluid used (usually oil) is flammable and can cause burns or fires.

Examples of hydraulic systems:

Hydraulic lifts in automotive garages

Hydraulic jacks and presses

Hydraulic brakes in vehicles

Excavators and bulldozers

Type of light each space telescope primarily uses is Shortest wavelength: Chandra, Hubble, Spitzer and Longest wavelength: Spitzer, Hubble, Chandra.

The Chandra X-ray Observatory primarily uses X-rays, which have very short wavelengths in the electromagnetic spectrum.

The Hubble Space Telescope primarily uses visible light, which has a slightly longer wavelength than X-rays. The Spitzer Space Telescope primarily uses infrared light, which has the longest wavelengths of the three types of light.

Therefore, the order of telescopes from shortest to longest wavelength is Chandra, Hubble, and Spitzer. Conversely, the order of telescopes from longest to shortest wavelength is Spitzer, Hubble, and Chandra.

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Answer:

Metals tend to have a low attraction for electrons.

Answer:

First, we need to find out how many moles of BaBr2 we have. We can do this by dividing the given mass by its molar mass:

Moles of BaBr2 = 272.08 g / 297.13 g/mol = 0.915 moles

From the balanced equation, we know that 1 mole of BaBr2 reacts with 2 moles of KBr. Therefore, we can use stoichiometry to find out how many moles of KBr will be produced:

Moles of KBr = 0.915 moles BaBr2 × (2 moles KBr / 1 mole BaBr2) = 1.83 moles KBr

Finally, we can use the molar mass of KBr to calculate its mass:

Mass of KBr = 1.83 moles × 119.00 g/mol = 217.77 g

Therefore, 272.08 grams of BaBr2 will produce 217.77 grams or 1.83 moles of KBr.

The temperature for the can explode : 627 °C

Gay Lussac's Law  

When the volume is not changed, the gas pressure is proportional to its absolute temperature  

\(\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\)

T₁=27 C+273=300 K

P₁=30 psi

P₂=90 psi

\(\tt T_2=\dfrac{P_2\times T_1}{P_1}\\\\T_2=\dfrac{90\times 300}{30}\\\\T_2=900~K=627^oC\)

Transport via pipelines is only possible for specialist goods like liquids and gases.

Gas is a state of matter that lacks both a defined shape and volume. Compared to other states pf material, such as liquids and solids, gasses have a lower density. Particles, which have a great deal of kinetic energy but aren't very attracted to one another, are separated by a lot of free space.

The Earth's atmosphere is made up of approximately % ammonia, 21 percent oxygen, 0.93 % argon, 0.04 % carbon dioxide, and small traces of bright blue, helium, methane, krypton, ozone, and hydrogen in the form of water vapor, according to the educational website Vision Starting to learn (opens in new tab).

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Answer:

Chemical was added in the zinc oxide to the theorems to reduce the zinc oxide.

Explanation:

The number of moles of phosphoric acid is  0.35 moles

A kidney stone is a hard, solid mass that forms in the kidneys or urinary tract. Kidney stones are made up of minerals and salts that are normally found in the urine, but when they become concentrated, they can form solid crystals that can grow in size.

Kidney stones can vary in size and shape, and can be as small as a grain of sand or as large as a golf ball. They can be located anywhere in the urinary tract, from the kidneys to the bladder, and can cause significant pain and discomfort as they pass through the ureters and urethra.

The reaction equation is;

3Ca(NO3)2 + 2H3PO4 → Ca3(PO4)2 + 6HNO3

Number of moles of calcium nitrate = 85 g/164 g/mol

= 0.52 moles

If 3 moles of Ca(NO3)2 reacts with 2 moles of H3PO4

0.52 moles of Ca(NO3)2 reacts with 0.52 * 2/3

= 0.35 moles

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