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When you dissolve salt in water, the sodium chloride dissociates in Na + ions and Cl - ions, which may be written as a chemical equation : NaCl (s) → Na + (aq) + Cl - (aq) Therefore, dissolving salt in water is a chemical change. The reactant (sodium chloride, or NaCl) is different from the products (sodium cation and chlorine anion).

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A solution of salt dissolved in water is an example of a homogeneous mixture. When the salt dissolves, it spreads evenly through the water so that all parts of the solution are the same, and you can no longer see the salt as being separate from the water. Think also of coffee without milk.

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Salt has 14,000 known uses. Manufacturing textiles, glass, rubber, leather, even drilling oil wells, depends on salt. Common uses of salt include seasoning of food, deicing for safe roads, feeding animals and plants, and softening hard water. Will salt dissolve in all liquids? No. In process of dissolving, molecules of the solute are inserted ...

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Water is absorbed by a paper towel Physical When copper metal is heated in concentrated nitric acid, the copper dissolves to form a deep blue solution, and a brown gas is evolved from the acid.

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A point will come where you will see the undissolved salt particles in water. Keep count of the number of pen caps of salt transferred till this point, and hence the mass of the salt dissolved. This will give you the solubility of salt in 50 ml of boiling hot water.

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because salt lowers the freezing point of water. When snow mixes with salt on the roads, a saltwater solution that does not freeze at 0°C is formed. The more salt that is used, the lower the freezing point of the solution. Since salt dissolves in the small amount of water usually present on the surface of ice, it helps to melt any ice already

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For example, if you dissolve sugar in water you can easily reverse the change by evaporating the water from the solution. When all the water evaporates, sugar crystals will be left behind. Physical changes also happen when matter changes states.

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Dec 15, 2010 · its physical or chemical depending on which salt you dissolve in water. usually salt is an ionic compound. when you put salt in water, the salt dissociates into its ions and so it dissolves. you...

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Almost anything can be found in seawater. This includes dissolved materials from Earth's crust as well as materials released from organisms. The most important components of seawater that influence life forms are salinity, temperature, dissolved gases (mostly oxygen and carbon dioxide), nutrients, and pH.

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For example, the fact that sodium reacts with water is a chemical property. Physical properties are properties of an element or compound that can be observed without a chemical reaction of the substance. Examples : A substance's color and density are physical properties.

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The sugar dissolves in the water, and you cannot see it. ... How is a chemical change different from a physical change? ... What will happen to the salt water if the ...

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Sep 02, 2020 · The solution of water and rock salt should be passed through the filter paper where the sand ( which will not have dissolved in the water ) will collect. Salt does dissolve in water and so will pass through the filter paper. Stage 4 – Evaporating. To separate the salt from the water the water needs to be evaporated off, either by leaving the ...

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