Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.

Dissolving is your answer to this question. Becuase when something dissolves it is no longer in the same shape or state cause if something dissovles then goes away into another state.

Changes of state are physical changes. They occur when matter absorbs or loses energy. Processes in which matter changes between liquid and solid states are freezing and melting. Processes in which matter changes between liquid and gaseous states are vaporization, evaporation, and condensation.

The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.

Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter’s chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization. These changes are shown in Figure below.

Processes involved in changes of state include melting, freezing, sublimation, deposition, condensation, and evaporation. Energy is always involved in changes of state. Particles of matter either absorb or lose energy when matter changes from one state to another.

State changes are reversible – ice can be melted and then frozen again. No new elements or compounds are formed. The closeness, arrangement and motion of the particles in a substance change when it changes state. bonds between particles break when a substance melts or evaporates, or sublimes to form a gas from a solid.

Answer: Statement-1 : Change in internal energy in the melting process is due to change in internal potential energy. Statement-2 : This is because in melting, distance between molecules increases but temperature remains constant.

evaporation

Volume of body sweat increased in both races with rate of walking; volume of hand sweat increased more in Whites than in Blacks. The Mann-Whitney test revealed that volumes of hand sweat were significantly greater for Whites than for Blacks.

The most common areas of sweating on the body include:

• armpits.
• face.
• palms of the hands.
• soles of the feet.

Sweating is the release of liquid from the body’s sweat glands. This liquid contains salt. This process is also called perspiration. Sweating helps your body stay cool.

Thermoregulatory stimuli (heat) stimulate the release of acetylcholine (the neurotransmitter) from nerve endings in the eccrine glands and catalyse sweat secretion.

Sweating is your body’s mechanism to cool itself. Your nervous system automatically triggers your sweat glands when your body temperature rises. Sweating also normally occurs, especially on your palms, when you’re nervous. The most common form of hyperhidrosis is called primary focal (essential) hyperhidrosis.

Sweating, or perspiring, is how the body regulates temperature—sweat keeps us cool and comfortable and prevents the body from overheating in hot environments or during exercise.

Sweat is 99% water combined with a small amount of salt, proteins, carbohydrates and urea, says UAMS family medicine physician Dr. Charles Smith. Therefore, sweat is not made up of toxins from your body, and the belief that sweat can cleanse the body is a myth. “You cannot sweat toxins out of the body,” Dr.

Night sweats refer to excess sweating during the night. But if your bedroom is unusually hot or you are wearing too many bedclothes, you may sweat during sleep, and this is normal.

Sweat is good for the skin. Water hydrates, minerals and salt naturally exfoliate, and urea and uric acid combat dry skin and dermatitis. Sweating purges the skin of bacteria, dirt, oils and impurities. The optimal pH factor for the skin is the same as the pH factor of sweat.

Sweating in normal amounts is an essential bodily process. Not sweating enough and sweating too much can both cause problems. The absence of sweat can be dangerous because your risk of overheating increases. Excessive sweating may be more psychologically damaging than physically damaging.

On top of this, increased circulation from exercise means more oxygen and nutrients are delivered to your skin cells – which will radiate on your face. But you can also enhance elasticity by toning your facial muscles specifically.

Sweating is great for your skin unless you leave it there to dry, which may clog the pores. “But make sure you’re cleansing your skin immediately afterward,” says Jodi Dorf, manager and esthetician at Stars Esthetics Spa in Baltimore. Allowing sweat to dry on the skin can clog pores and cause acne.

All you absolutely need, bare bones, to stay clean is water. Just water. Water does a fine job of rinsing away dirt without stripping vital oils from your skin. Also, avoid those luxurious long, hot showers.

When it is humid out the atmosphere is already fairly saturated, making it difficult for the sweat from your body to evaporate. Since that sweat can not evaporate, it tends to cling onto the body giving you that overall ‘sticky’ feeling.

Excessive sweating, or hyperhidrosis, can be a warning sign of thyroid problems, diabetes or infection. Excessive sweating is also more common in people who are overweight or out of shape. The good news is that most cases of excessive sweating are harmless.

From a physiological perspective, sweating is absolutely a good thing. Our body would overheat if we did not sweat. But some of the activities that cause sweating (excessive time in the heat, being nervous or sick) is associated with other problems, such as heat exhaustion, anxiety and illness.

Sweating more than usual — especially if you aren’t exercising or being active — could be an early warning sign of heart problems. Pumping blood through clogged arteries takes more effort from your heart, so your body sweats more to try to keep your body temperature down during the extra exertion.

Ross syndrome is a rare dysautonomia characterized by a clinical complex of segmental anhidrosis or hypohidrosis, areflexia, and tonic pupils. A very few cases (≃50) have been reported in literature since its original description in 1958.

Changing state Transferring energy to or from a substance can change its state. Heating a substance in the solid state will cause it to melt , which changes it to the liquid state. Continued heating will cause the substance to evaporate or boil, which changes it to the gas state.

A change in state refers to the changing of the arrangement and bonding between particles (and thus shape) of a substance at a given temperature.

Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter’s chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization.

In order for the molecules to actually separate from each other, more energy must be added. This energy, called heat of fusion or heat of melting, is absorbed by the particles as potential energy as the solid changes to a liquid.

Matter changes state when energy is added or taken away. Most matter changes because of heat energy. When matter is heated enough, the molecules move faster and with greater energy. If enough heat is added, a solid can become liquid and a liquid can become gas.

All matter can move from one state to another. It may require extreme temperatures or extreme pressures, but it can be done. Sometimes a substance doesn’t want to change states. To create a solid, you might have to decrease the temperature by a huge amount and then add pressure.

There are three common states of matter:

• Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other.
• Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded.
• Gases – no definite volume or shape.

The common things among the three states of matter are: They are made up of small tiny particles. They have a particular mass and can occupy space. The atoms of these three states have force of attractions between them.

Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Three States of Matter

• Matter can exist in one of three main states: solid, liquid, or gas.
• Solid matter is composed of tightly packed particles.
• Liquid matter is made of more loosely packed particles.
• Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.

The two most common properties are intermolecular forces and density. Explanation: Anything that has mass and volume and can occupy space is known as matter. The composition of matter shows that it has small particles.

Matter can be defined or described as anything that takes up space, and it is composed of miniscule particles called atoms. It must display the two properties of mass and volume.

All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample).

Key Points

• All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive.
• Extensive properties, such as mass and volume, depend on the amount of matter being measured.

All properties of matter are either extensive or intensive and either physical or chemical. Extensive properties, such as mass and volume, depend on the amount of matter that is being measured. Intensive properties, such as density and color, do not depend on the amount of matter.

The characteristics that enable us to distinguish one substance from another are called properties. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed.

An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount.

The properties that are independent of the mass or size of the system or which does not depend on the amount of substance are known as intensive properties. Hence volume is an extensive property.