State two different between scale and chemical change. Why is rusting considered as a chemical change? Is…

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State two different between scale and chemical change. Why is rusting considered as a chemical change? Is dissolving sugar in water the chemical or physical change? Explain. State three signs that a chemical change has occurred.

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1) State two differences between physical and chemical change. In a physical change, no new substance is formed, only the form or appearance of the substance changes. This change is often reversible. In a chemical change, a new substance with different chemical properties is formed. This change is usually irreversible. 2) Why is rusting considered a chemical change? Rusting is considered a chemical change because it involves iron reacting with oxygen and water to form a new substance, iron oxide (rust), which has different chemical properties than the original iron. 3) Is dissolving sugar in water a chemical change or a physical change? Explain. Dissolving sugar in water is a physical change. When sugar dissolves, the sugar molecules disperse throughout the water, but their chemical structure remains the same. No new substance is formed, and the sugar can be recovered by evaporating the water. 4) State three signs that a chemical change has occurred. Three signs that a chemical change has occurred are: Formation of a gas (e.g., bubbles). Change in color. Change in temperature (heat is absorbed or released).

State two different between scale and chemical change. Why is rusting considered as a chemical change? Is dissolving sugar in water the chemical or physical change? Explain. State three signs that a chemical change has occurred.

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