![]() We often notice a change in odor when we cook food.ġ1 Food that is being cooked often gives off an aroma, or smellįood that is being cooked often gives off an aroma, or smell. We often detect a chemical change by noticing a change of odor or aroma. ![]() It is also known as a chemical reaction.ġ0 We often notice a change in odor when we cook food. Examples: Sugar dissolved in waterħ What do all physical changes have in common?Īll physical changes alter the form of an object without changing what type of matter it is.Ĩ What are some examples of physical changes you see around school?Ĭrushing aluminum cans Shaping clay Blowing up a basketball Balling up paperĩ Chemical Changes A chemical change occurs when atoms link together in new ways to create substances different from the original substances. The substances in a mixture can be separated. In each state, the particles are still water.Ħ Combining two substances to form a mixture is a physical change. Finally, when it evaporates, it is water in gas form. The substance does not change its chemical identity in this process. Are these physical changes? Yes, a substance can change from solid to liquid to gas. After some time, it will disappear as the water turns to gas. You only change the size of each piece, not the type of elements inside.ĥ Change of state If you place a piece of ice on the sidewalk outside, it will melt. ![]() ![]() Molding clay Cutting a piece of paper Sharpening a pencil Melting iceĤ What happens when you tear a sheet of paper into tiny pieces? Presentation on theme: "Physical and Chemical Changes"- Presentation transcript:Ī change that alters the form of an object without changing what type of matter it is.ģ What are some examples of physical changes? ![]()
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