it is as i think a physical change
Heating anything to a visible change is ALWAYS a chemical change
sulfur sodium chloride sand is a homogeneous mixture (solution)
No, heating sodium chloride is a physical change rather than a chemical change. When heated, sodium chloride simply changes physical state from a solid to a liquid (molten form) without any change in its chemical composition.
Heating potassium bicarbonate is a chemical change because it causes a decomposition reaction. This results in the formation of new substances (potassium carbonate, water, and carbon dioxide) that have different chemical properties than the original compound.
Neither, Sodium Chloride (NaCl) is a salt (table salt) made by reacting the metal Sodium with the Gas Chlorine. The substance, Sodium Chloride, has both physical and chemical properties but is not a property itself.
Chemical
The chemical name for electrolyte paste is typically a mixture of salts, such as sodium chloride, potassium chloride, and/or calcium chloride. These salts help replenish electrolytes like sodium and potassium that are lost through sweating during physical activity.
Potassium metal does not dissolve in water, it is so reactive that it rips water molecules apart releasing hydrogen gas and combining with the remaining hydroxyl group to form potassium hydroxide (potash lye) which then dissolves in the water. This chemical reaction releases so much heat that it ignites the hydrogen gas that was emitted which produces water vapor/steam and a light purple flame (caused by excited potassium ions).
Heating anything to a visible change is ALWAYS a chemical change
Potassium is not a change; potassium (K) is a chemical element.
Sodium chloride is a chemical compound (NaCl), not a property.
The reaction between hydrochloric acid and potassium hydroxide is a chemical reaction that forms water and potassium chloride salt. It is an exothermic reaction, meaning that heat is released as a result of the reaction.
physical
The physical appearance of Sodium chloride is a white crystalline solid.
It would be chemical.
This is a chemical reaction, a chemical change.
Dissolving sodium chloride in water is a physical change because the chemical composition of sodium chloride remains the same. The sodium and chloride ions are simply dispersed throughout the water, but they can still be recovered by evaporating the water.