B. Chemical change 9. It is an example of physical change. A. rusting metal B. burning wood C. cutting paper D. ripening fruit 10. Which of the following shows a chemical change? A. slicing cake B. souring milk C. melting ice candy D. tearing paper 11. The following are examples of chemical change EXCEPT A. rusting nail B. burning paper C. rotting banana D. boiling water 12. What causes rust to form? A. reaction of iron to oxygen C. reaction of iron to force D. reaction of iron to light B. reaction of iron to heat 13. When an apple is cut, the fleshy part of the fruit changes its color into?
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Answer:
B.
Explanation:
B.
9. A physical change is a change in appearance only. ... Examples of physical change include, cutting paper, melting butter, dissolving salt in water, and breaking glass. A chemical change occurs when matter is changed into one or more different types of matter.
10. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change. Burning, cooking, rusting and rotting are examples of chemical changes. The souring of milk is a chemical reaction. Milk that is spoiled is sour, with a foul taste and odor. It can also become lumpy and curdled.
11. Boiling water: Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O).
12. Rust is the result of corroding steel after the iron (Fe) particles have been exposed to oxygen and moisture (e.g., humidity, vapor, immersion). ... Oxygen causes these electrons to rise up and form hydroxyl ions (OH). The hydroxyl ions react with the FE⁺⁺ to form hydrous iron oxide (FeOH), better known as rust.
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