1. classify each description as a physical change or chemical change.\na) milk spoiling in the fridge and…

1. classify each description as a physical change or chemical change.\na) milk spoiling in the fridge and starting to sour\nb) transforming iron into steel using a blast furnace\nc) water evaporating from a sidewalk in a hot day\nd) dissolving sugar into coffee\ne) digesting food after eating a large meal\ne) popping popcorn in a microwave\nf) shredding paper\ng) a firework exploding

1. classify each description as a physical change or chemical change.\na) milk spoiling in the fridge and starting to sour\nb) transforming iron into steel using a blast furnace\nc) water evaporating from a sidewalk in a hot day\nd) dissolving sugar into coffee\ne) digesting food after eating a large meal\ne) popping popcorn in a microwave\nf) shredding paper\ng) a firework exploding

Answer

Brief Explanations:

  • a) Milk spoiling is a chemical change as new substances are formed by bacterial action.
  • b) Transforming iron to steel is a chemical change as the composition changes through reactions in the blast - furnace.
  • c) Water evaporating is a physical change as it is a change of state from liquid to gas without changing the substance's chemical identity.
  • d) Dissolving sugar in coffee is a physical change as it is a mixture formation without new chemical substances.
  • e) Digesting food is a chemical change as enzymes break down food into new substances.
  • f) Popping popcorn is a chemical change as heat causes chemical reactions in the kernels.
  • g) Shredding paper is a physical change as it only changes the physical form, not the chemical composition.
  • h) A firework exploding is a chemical change as it involves rapid chemical reactions producing heat, light, and new substances.

Answer:

a) Chemical change b) Chemical change c) Physical change d) Physical change e) Chemical change f) Chemical change g) Physical change h) Chemical change