When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron filings and sulphur.Explain this observation

Answer:

Not too reactive

Explanation:

Iodine is a halogen and is reactive, but it is significantly less reactive than other halogens like chlorine, bromine, and fluorine.

Answer: The correct answer is (1).

Explanation:

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = = 0.005 grams

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

What are parts per million?

Parts per million (ppm) is how many parts a certain molecule or compound makes up within the one million parts of the whole solution.

Concentration of the solute in 1000 g of solution: 5 parts per million

1 part per million = 1 milligram/Liter

Then , 5 parts per million = 5 mg/liter

This means that 5 milligrams of solute is present in 1 liter solution.

1 gram = 1000 milligrams

Then 5 milligram = 5 X = 0.005 grams.

Hence, 0.005 grams is the total mass of solute in 1000 grams of a solution having a concentration of 5 parts per million.

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The atoms that would sterically interact with methyl group located axially are highlighted in pink color in the attached image.

Further Explanation:

The stereoisomer of a molecule that has same chemical formula and connectivity of bond but differs in the arrangement of the atoms in space is known as conformer. The rotation about the carbon-carbon single bond can lead to the formation of conformer of a molecule.

There are four conformers of cyclohexane molecule as follows:

• Chair conformation
• Boat conformation
• Twist boat conformation
• Half chair conformation

Chair conformation is considered as the best conformation of cyclohexane. The hydrogen in blue denote the axial positions and the hydrogen in pink denote equatorial positions. (Refer to the attached image)

The stable conformation is that in which the bulky groups such as hydroxyl, methyl, and nitro group occupy the equatorial positions while the relatively small groups such as hydrogen atoms occupy axial positions. The reason is that the axially placed substituents suffer more steric repulsion and that generates strain in the molecule. The strain leads to high energy and thus less stability.

While writing the chair conformation the bulkier groups are preferentially placed at equatorial positions. The conformation that has bulky group at equatorial position is more favorable than the conformation that has bulky group at axial position. The reason for the stability of the conformation is diaxial interactions.

1,3-diaxial interaction: The 1,3-diaxial interactions occur among the axial substituent present at 1 and 3 positions.

The conformation in the problem has axial substituent hydrogen and bromine at the two positions 3 and 3’ which lead to 1,3-diaxial strain in the molecule and makes it unstable. (Refer to the attached image)

Learn more:

1. Balanced chemical equation brainly.com/question/1405182

2. Oxidation and reduction reaction: brainly.com/question/2973661

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Conformation of cyclohexane  

Keywords: Cyclohexane, planar, chair conformation, axial positions, equatorial positions, steric repulsion, high energy, 1, 3-diaxial interaction, 1, 3-diaxial strain.

Final answer:

In a substituted cyclohexane, 1,3-diaxial interactions happen between groups on the same side of the ring but are two carbons apart. In this scenario, the hydrogen atoms on carbons 3 and 5 would interact with the methyl group, causing steric strain.

Explanation:

In a substituted cyclohexane compound, 1,3-diaxial interactions occur between groups that are on the same side of the ring but are two carbons apart. In this case, the question focuses on the steric interactions with the methyl group. Assuming that the methyl group is on carbon-1 of the ring, the hydrogen atoms on carbons 3 and 5 (both axial positions) on the same face of the ring would sterically interact with the methyl group in a 1,3-diaxial fashion. This steric interaction leads to steric strain, which destabilizes the compound and promotes a conformational flip to relieve this strain.

Learn more about Steric Interactions here:

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Answer : Option D) The outer ear has to collect the sound waves and lead them to the middle ear.

Explanation : Hearing is dependent on a series of complex steps that change vibrations of sound waves in the air into electrical signals. At first the vibrations of sound waves gets collected by the outer ear and from there sound waves travel through a narrow passageway called the ear canal, which leads to the eardrum. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. The auditory nerve then carries these signals to the brain.