Question

is this a chemical or a physical change? a iron nail is left in a puddle of water and begins to rust. a physical change b chemical change pregunta 6 (1 punto) is this a chemical or a physical change? you combine two clear liquids, and once mixed they turn cloudy - white in color. a physical change b chemical change pregunta 7 (1 punto) is this a chemical or a physical change? water that is dyed blue is mixed with water that is dyed yellow. once mixed the color of the water is green. a physical change b chemical change pregunta 8 (1 punto) is this a chemical or a physical change? cutting an apple in half. a physical change b chemical change

Explanation:

1. Rusting of an iron nail is a chemical change as a new substance (iron oxide) is formed through a chemical reaction with oxygen in water.
2. When two clear - liquids turn cloudy - white upon mixing, it usually indicates the formation of a precipitate, which is a sign of a chemical reaction.
3. Mixing dyed water of different colors to get a new color is a physical change as no new chemical substances are formed; it's just a mixture of colored substances.
4. Cutting an apple in half is a physical change as it only changes the physical form of the apple without altering its chemical composition.

Answer:

1. b. Chemical change
2. b. Chemical change
3. a. Physical change
4. a. Physical change