part a\ncan you recognize the chemical and physical changes that happen all around us? if you change the way…

part a\ncan you recognize the chemical and physical changes that happen all around us? if you change the way something looks, but havent made a new substance, a physical change (p) has occurred. if the substance has been changes into another substance, a chemical change (c) has occurred.\n1. an ice cube is placed in the sun. later there is a puddle of water. later still the puddle is gone.\n2. two chemical are mixed together and a gas is produce.\n3. a bicycle changes color as it rusts.\n4. a solid is crushed to a powder.\n5. two substances are mixed and light is produced.\n6. a piece of ice melts and reacts with sodium.\n7. mixing salt and pepper.\n8. chocolate syrup is dissolved in milk.\n9. a marshmallow is toasted over a campfire.\n10. a marshmallow is cut in half.

part a\ncan you recognize the chemical and physical changes that happen all around us? if you change the way something looks, but havent made a new substance, a physical change (p) has occurred. if the substance has been changes into another substance, a chemical change (c) has occurred.\n1. an ice cube is placed in the sun. later there is a puddle of water. later still the puddle is gone.\n2. two chemical are mixed together and a gas is produce.\n3. a bicycle changes color as it rusts.\n4. a solid is crushed to a powder.\n5. two substances are mixed and light is produced.\n6. a piece of ice melts and reacts with sodium.\n7. mixing salt and pepper.\n8. chocolate syrup is dissolved in milk.\n9. a marshmallow is toasted over a campfire.\n10. a marshmallow is cut in half.

Answer

Explanation:

Step1: Analyze ice - cube melting

Ice melting to water and then evaporating is a change of state (solid - liquid - gas). No new substance is formed. So it is a physical change (P).

Step2: Analyze chemical mixing producing gas

When two chemicals are mixed and a gas is produced, a new substance (the gas) is formed. So it is a chemical change (C).

Step3: Analyze bicycle rusting

Rusting of a bicycle involves iron reacting with oxygen and water to form iron oxide (rust), a new substance. So it is a chemical change (C).

Step4: Analyze solid crushed to powder

Crushing a solid to a powder only changes the physical form (size and shape) of the substance. No new substance is formed. So it is a physical change (P).

Step5: Analyze substances mixing and producing light

When two substances mix and light is produced, a chemical reaction is occurring and new substances are likely formed. So it is a chemical change (C).

Step6: Analyze ice melting and reacting with sodium

The melting of ice is a physical change, but the reaction of water (from melted ice) with sodium is a chemical reaction forming new substances like sodium hydroxide and hydrogen gas. Overall, it is a chemical change (C).

Step7: Analyze mixing salt and pepper

Mixing salt and pepper is just a physical combination of two substances. No new chemical substances are formed. So it is a physical change (P).

Step8: Analyze chocolate syrup dissolving in milk

Dissolving chocolate syrup in milk is a physical process of dispersion. No new chemical substances are formed. So it is a physical change (P).

Step9: Analyze toasting marshmallow

Toasting a marshmallow over a camp - fire causes the sugar in the marshmallow to undergo a chemical reaction (caramelization and combustion), forming new substances. So it is a chemical change (C).

Step10: Analyze cutting marshmallow in half

Cutting a marshmallow in half only changes its physical shape and size. No new substance is formed. So it is a physical change (P).

Answer:

  1. P
  2. C
  3. C
  4. P
  5. C
  6. C
  7. P
  8. P
  9. C
  10. P