Question

chemistry help me no useless answer​

Answer 1

Answer :

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

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Answer 2

GIVE REASON

• Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material (e.g. steel) in a room environment.

• This helps oxygen get to your lungs and heart, and other parts of your body. The extra oxygen can make you stronger and more alert. It can help prevent death in people with COPD (severe chronic obstructive pulmonary disease) who have low oxygen levels much of the time. But people often stay on oxygen therapy too long.

• The increase in mass is due to the fact that oxygen from the air has combined with the magnesium to make magnesium oxide, MgO. The chemical equation,Mg+O2→MgO shows this reaction but it needs to be balanced to make 2Mg+O2→2MgO

Differences between

• Combustion is a rapid process while rusting is a slow process. 2. Combustion releases light during the process while rusting does not produce any light. ... Combustion results in release of large amount of heat while rusting very little amount of heat evolved.

• Temperature doesn't rise and most of the energy is trapped in the form of ATP molecules. At the end of the reaction between oxygen and coenzymes, oxidation occurs during respiration.
• Temperature doesn't rise and most of the energy is trapped in the form of ATP molecules. At the end of the reaction between oxygen and coenzymes, oxidation occurs during respiration....
• Temperature doesn't rise and most of the energy is trapped in the form of ATP molecules. At the end of the reaction between oxygen and coenzymes, oxidation occurs during respiration....Difference Between Respiration and Combustion.
• Temperature doesn't rise and most of the energy is trapped in the form of ATP molecules. At the end of the reaction between oxygen and coenzymes, oxidation occurs during respiration....Difference Between Respiration and Combustion.Respiration Combustion
• Temperature doesn't rise and most of the energy is trapped in the form of ATP molecules. At the end of the reaction between oxygen and coenzymes, oxidation occurs during respiration....Difference Between Respiration and Combustion.Respiration CombustionIt takes place in a controlled manner inside the cells. It is an uncontrollable process

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