can you recognize the chemical and physical changes that happen all around us? if you change the way…

can 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. 1. an ice cube is placed in the sun. later there is a puddle of water. later still the puddle is gone. 2. two chemical are mixed together and a gas is produce. 3. a bicycle changes color as it rusts. 4. a solid is crushed to a powder. 5. two substances are mixed and light is produced. 6. a piece of ice melts and reacts with sodium. 7. mixing salt and pepper. 8. chocolate syrup is dissolved in milk. 9. a marshmallow is toasted over a campfire. 10. a marshmallow is cut in half.

can 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. 1. an ice cube is placed in the sun. later there is a puddle of water. later still the puddle is gone. 2. two chemical are mixed together and a gas is produce. 3. a bicycle changes color as it rusts. 4. a solid is crushed to a powder. 5. two substances are mixed and light is produced. 6. a piece of ice melts and reacts with sodium. 7. mixing salt and pepper. 8. chocolate syrup is dissolved in milk. 9. a marshmallow is toasted over a campfire. 10. a marshmallow is cut in half.

Answer

Explanation:

Step1: Analyze ice - cube melting

An ice cube melting in the sun and turning into 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 is a chemical reaction between iron in the bicycle, oxygen, and water to form iron oxide (rust). A new substance is formed. So it is a chemical change (C).

Step4: Analyze crushing a solid to powder

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

Step5: Analyze mixing substances producing light

When two substances are mixed and light is produced, a chemical reaction is likely occurring and new substances are 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 when it reacts with sodium, a chemical reaction occurs and new substances are formed. So 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 substance is formed. So it is a physical change (P).

Step8: Analyze dissolving chocolate syrup in milk

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

Step9: Analyze toasting a marshmallow

Toasting a marshmallow over a camp - fire causes a chemical reaction due to heat, changing the composition of the marshmallow. A new substance is formed. So it is a chemical change (C).

Step10: Analyze cutting a marshmallow in half

Cutting a marshmallow in half only changes its physical shape. 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