Answer:
Step 1: Burning Candle - Mass- 2.19 The wick of the candle changed colors, from white to black. The shape and height of the candle changed.
Step 2: Cooling Candle - Mass- 2.18, The shape of the has a flat surface.
Step 3: Tearing paper - The paper is somewhat easy to tear, and its edges change shape. It does take a bit to tear it into pieces though.
Step 4: Wet paper - It absorbed the water easily. It became very fragile.
Step 5: Burning pieces of paper - The paper burned fast, it changed color and folded inward and downward.
Step 6: Salt and water in test tube - The water changed color and even bubbled. Small particles of salt dissolve.
Step 7: Baking soda and vinegar - The substance bubbled and changed to a white yet somewhat transparent color.
In chemical changes, composition is the factor that changes, and it's sometimes harder to identify a chemical change as it can't always be seen. Whereas physical changes are more easily identifiable because they include smell, color, anything to do with appearance.
In the candle tests, it was a physical change because its physical appearance changed, such as its height, mass, and color of the wick. The tearing paper test was a physical change too because its physical appearance changed. It’s shape being the main change. I think the burning the paper was both physical and chemical because its physical appearance, the color and shape, changed. But the properties of it changed too, because it went from being paper to being ashes. The salt & water and the baking soda & vinegar were both chemical changes because some properties changed and they formed new substances. Both things caused a gas like substance to form which caused the bubbling formation of both.
Explanation:
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