Describe two differences between transition elements and alkali metals?

In the molecule Fe(CO)5, the central Fe atom has no formal charge. This molecule is an example of a coordination compound where the Fe atom is bonded to five carbonyl (CO) ligands. The CO ligands are neutral, and the overall charge of the molecule is zero.

Fe(CO)5 is known as iron pentacarbonyl and belongs to a class of compounds called metal carbonyls. In these compounds, the metal atom forms a coordinate covalent bond with the carbon atom of the carbonyl group. The metal donates a pair of electrons to the carbon atom, while the carbon atom donates a pair of electrons back to the metal atom. This type of bonding results in no formal charge being assigned to the central metal atom or the ligands.

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Explanation:

Hey there!

Your answer is: acid X having ph value 2.

The reason is when we see on an indicator, we find that different ph values of acids and bases. Generally, acids are located in left side of an indicator. 1,2,3 are most strong acid and 4,5,6 are weak acid according to the indicator's study.

So, we can derive that " X " acid is strong.

Hope it helps...

Answer:

Calcium monohydride is a molecule composed of calcium and hydrogen with formula CaH. It can be found in stars as a gas formed when calcium atoms are present with hydrogen atoms.Calcium carbonate is a chemical compound with the formula CaCO3 formed by three main elements: carbon, oxygen and calcium.

Explanation:

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There would be two possible unique products of the reaction which could be found to be stereoisomers of each other.

Now we know that the compound as shown can undergo monobromination and the product of that bromination is the same compound. However, we would have two steroisomers because of the mechanism of the reaction.

Given the mechanism of the reaction we know that there would be two possible unique products of the reaction which could be found to be stereoisomers of each other.

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The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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If hard water is softened by the ion exchange method, the level of sodium (d) will increase. This is because calcium and magnesium ions in the hard water are replaced with sodium ions during the ion exchange process.

The ion exchange method for softening hard water includes swapping out the calcium and magnesium ions for sodium ions, which raises the concentration of sodium in the water. This procedure has no impact on the levels of dissolved oxygen or iron.

The correct answer is d. sodium. Softening hard water through the ion exchange method involves replacing the calcium and magnesium ions with sodium ions, which results in an increase in the level of sodium in the water. Dissolved oxygen and iron levels are not affected by this process, and P1-1 is not a relevant term for this question.

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Question

The system international (SI) unit for energy is:

Answer: joule

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Explanation:

We have to balance the following equation:

__ H₂O + __ F₂ -------> __ HF + __ O₂

First we have to determine the number of atoms of each element that we have on both sides of the equation.

__ H₂O + __ F₂ -------> __ HF + __ O₂

O: 1 O: 2

H: 2 H: 1

F: 2 F: 1

We have 2 atoms of O on the right side and 1 atom of O on the left side. To balance the O atoms we can change the coefficient for H₂O and write a 2 in front of it.

2 H₂O + __ F₂ -------> __ HF + __ O₂

O: 2 O: 2

H: 4 H: 1

F: 2 F: 1

Then we have 4 atoms of H on the left and 1 atom of H on the right side of the equation. We can change the coefficient for HF to balance the H atoms.

2 H₂O + __ F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 2 F: 4

And finally we have 2 atoms of F on the left and 4 atoms of F on the right. We can change the coefficient for F₂ and write a 2 there.

2 H₂O + 2 F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 4 F: 4

The equation is balanced.

Answer: 2 H₂O + 2 F₂ -------> 4 HF + O₂

Hunting deer can be considered resource extraction. It involves the loss of biodiversity.

Resource extraction refers to the usage of fundamental resources (biodiversity resources) from the environment.

Hunting deer is considered a resource extraction activity because this activity involves the loss of biodiversity.

Biodiversity is a fundamental issue for the health (homeostasis state) of the whole ecosystem.

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Answer:

Hunting dear, fewer trees to a decrease in earths carbon dioxide absorption, advancements in medicine, Hydrogen is a component of water , removing acid causing oxides from factory smoke  

Explanation:

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Answer:

The electronegativity difference of the atoms in the bond.

Explanation:

Carbon is electropositive while Oxygen is highly electronegative, hence highly polar due to strong intermolecular forces.

The molecule is not symmetrical because it's dipole moments don't cancel out.

Radio waves have a lower frequency and energy than X-Rays, so the wavelength of radio waves is longer than X-Rays. longer. Option d is correct.

The best approach to compare them is to say that "A gamma ray has more energy than a radio wave because it has a shorter wavelength and a higher frequency."

The most energetic and high frequency particles are gamma rays. On the other side, radio waves are the EM radiation types with the lowest energies, longest wavelengths, and lowest frequencies.

All electromagnetic radiation travels in a vacuum at the speed of light (c), which is the same for all electromagnetic radiation types, including microwaves, visible light, and gamma rays.

Gamma rays contain the maximum energy because they are the strongest members of the electromagnetic spectrum. As a result, they also have a very low frequency and are better able to penetrate solids since they are less likely to interact with matter.

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Given:

Sum of masses of two isotopes = 371.9087 u

Re-185 natural abudance = 37.40%

Re-187 natural abudance = 62.60%

Known:

atomic weight of Re = 186.207 u

Atomic mass of Re-185:

To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.

abundance of Re-185 = 37.40% = 0.3740

(371.9087 - x) = atomic weight of Re-187 in u

To find mass of Re-187:

abundance of Re-187 = 62.60% = 0.6260

Solution:

Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.

Re-185: (0.3740)(x) = 0.3740x

Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x

Step 2. Add the results and set them equal to 186.207.

0.3740x + 232.8148462 - 0.6260x = 186.207

Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.

0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -

232.8148462

0.3740x - 0.6260x = -46.6078462

-0.2520x = -46.6078462

-0.2520x/-0.2520x = -46.6078462/-0.2520

x = 184.9517706 u

Step 4. Atomic weights of Re-185 and Re-187.

x = 185.0 u = the atomic weight of Re-185

(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187

Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.

Answer:

Explanation:

When Iron is dipped in Aluminium Chloride, a redox reaction occurs. Basically iron reacts with Chloride ion and forms a solid precipitate of Aluminium.

End result :Iron (II) Chloride forms and Aluminium forms the precipitate

The amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C is 1084.4 J.

To calculate the amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C, we can use the formula:

q = m x C x ΔT

where q is the heat absorbed, m is the mass of the solution, C is the specific heat capacity of the solution, and ΔT is the change in temperature.

First, we need to calculate the mass of the solution. The mass of the solution is the sum of the mass of the sodium hydroxide and the mass of water:

mass of solution = mass of NaOH + mass of water

mass of solution = 1.00 g + 25.0 g

mass of solution = 26.0 g

Next, we need to calculate the specific heat capacity of the solution. The specific heat capacity of a solution is the amount of heat required to raise the temperature of one gram of the solution by one degree Celsius. The specific heat capacity of a solution can be estimated as the weighted average of the specific heat capacities of the solute and solvent. The specific heat capacity of water is 4.18 J/g °C, and the specific heat capacity of sodium hydroxide is 1.23 J/g °C. The weight fraction of water in the solution is:

weight fraction of water = mass of water / mass of solutionweight fraction of water = 25.0 g / 26.0 g

weight fraction of water = 0.9615

The weight fraction of sodium hydroxide is therefore:

weight fraction of NaOH = 1 - weight fraction of water

weight fraction of NaOH = 1 - 0.9615

weight fraction of NaOH = 0.0385

Using these weight fractions and specific heat capacities, we can calculate the specific heat capacity of the solution:

C = (0.9615 x 4.18 J/g °C) + (0.0385 x 1.23 J/g °C)

C = 4.08 J/g °C

Finally, we can use the formula to calculate the heat absorbed:

q = m x C x ΔT

q = 26.0 g x 4.08 J/g °C x (45.3 °C - 23.2 °C)

q = 1084.4 J

Therefore, the amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C is 1084.4 J.

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Answer:

Explanation:

D.

carbon and oxygen atoms mixed without being bonded together

Answer:

168.75 ml

Explanation:

M1V1=M2V2

375ml*.45M=1M*V2

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 number of moles of Helium gas that could occupy the container when the volume is increased to 500 mL is 9.05 mol.

We can use the combined gas law to solve this problem:

(P1 x V1) / (n1 x T1) = (P2 x V2) / (n2 xT2)

where;

We know that the pressure and temperature are constant, so we can simplify the equation to:

V1/n1 = V2/n2

Solving for n2, we get:

n2 = (V2n1) / V1

Plugging in the values, we get:

n2 = (500 mL * 4.00 mol) / 221 mL

n2 = 9.05 mol

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Answer:

molecule

Explanation:

Answer:

The balanced chemical equation for the reaction you provided is: CaC2 + 2H2O → Ca(OH)2 + C2H2.

According to this equation, for every mole of CaC2 that reacts with 2 moles of H2O, one mole of C2H2 is formed. So if 1.25 moles of C2H2 are formed, it means that 1.25 moles of CaC2 reacted with 2.5 moles of H2O.

Therefore, 2.5 moles of water are consumed when 1.25 moles of C2H2 are formed.

Steps:

Here are the steps I took to determine how many moles of water are consumed when 1.25 moles of C2H2 are formed:

1. First, I looked at the balanced chemical equation you provided: CaC2 + 2H2O → Ca(OH)2 + C2H2.

2. From this equation, I could see that for every mole of CaC2 that reacts with 2 moles of H2O, one mole of C2H2 is formed. This is known as the stoichiometry of the reaction.

3. Since you mentioned that 1.25 moles of C2H2 are formed, I used the stoichiometry of the reaction to determine that 1.25 moles of CaC2 must have reacted with 2.5 moles of H2O (since for every mole of CaC2 that reacts, 2 moles of H2O are consumed).

4. Therefore, I concluded that 2.5 moles of water are consumed when 1.25 moles of C2H2 are formed.

I hope this explanation helps! Let me know if you have any further questions.

Answer: heterogeneous

Explanation: sorry if his did not help

Answer:

Condensation

Explanation:

By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

Your approach is incorrect because it does not consider all possible arrangements that satisfy the given conditions. Let's analyze your approach step by step.

You correctly start by seating one biologist, which can be done in 1 way. However, when you proceed to seat the second biologist, you assume that there are 3 choices. This is where the error occurs.

Consider the following possibilities:

If the first biologist is seated at Chair 1, the second biologist cannot be seated at Chair 2 or Chair 6, as they would be sitting next to each other. Therefore, the second biologist can only be seated at Chair 4.

If the first biologist is seated at Chair 2, the second biologist can only be seated at Chair 5.

If the first biologist is seated at Chair 3, the second biologist can only be seated at Chair 6 or Chair 1.

If the first biologist is seated at Chair 4, the second biologist can only be seated at Chair 1.

If the first biologist is seated at Chair 5, the second biologist can only be seated at Chair 2.

If the first biologist is seated at Chair 6, the second biologist can only be seated at Chair 3.

So, there are actually 6 different arrangements for seating the two biologists.

Now, if we continue with your approach, seating the chemists and physicists, we need to consider the additional possibilities that arise due to the constraints of the biologist's seating arrangements.

Therefore, the correct approach would involve considering all possible arrangements that satisfy the given conditions. By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

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Answer: Carbon,Hydrogen, Chlorine

Explanation:

C=Carbon

H=Hydrogen

Cl=Chlorine

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Answer:

Physical

Explanation:

When a substance changes from liquid to gas it's a physical change. There is no chemical reaction between the rubbing alcohol or anything else that would change it's chemical composition.

The hydrogen can be produced from water using renewable energy sources, which makes it more sustainable.

If we based our energy on hydrogen, two major economic or global problems that could be alleviated are:

1. Climate change: This is a global issue that requires an immediate response. The world needs to move away from carbon-emitting fossil fuels. Burning hydrogen fuel emits only water and does not release greenhouse gases. If the world shifts to hydrogen fuel, it will reduce carbon emissions and help to slow down climate change.

2. Dependence on Oil: Most countries are dependent on oil. The price of oil is volatile, and the demand and supply fluctuate due to political, economic, and weather events. This dependence on oil is a major economic challenge for many countries. If we based our energy on hydrogen, we could reduce our dependence on oil and decrease oil imports, which could significantly improve the economy of countries that do not produce oil.

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