in a chemical change, a chemical reaction occurs and new products form. energy is either absorbed or…

in a chemical change, a chemical reaction occurs and new products form. energy is either absorbed or released. in a physical change, matter changes form, but its identity is not changed. identify each change as chemical or physical.\n\n| change | physical or chemical change? |\n| ---- | ---- |\n| 1. heating water into steam | |\n| 2. milk going sour | |\n| 3. dissolving sugar in water | |\n| 4. iron rusting | |\n| 5. hydrochloric acid and sodium hydroxide reacting and forming salt and water | |\n| 6. digesting food into nutrients | |\n| 7. melting ice into water | |\n| 8. acid rain dripping onto limestone and making carbon dioxide gas | |\n| 9. breaking glass into pieces | |\n| 10. hydrogen peroxide decomposing into oxygen gas and water | |

in a chemical change, a chemical reaction occurs and new products form. energy is either absorbed or released. in a physical change, matter changes form, but its identity is not changed. identify each change as chemical or physical.\n\n| change | physical or chemical change? |\n| ---- | ---- |\n| 1. heating water into steam | |\n| 2. milk going sour | |\n| 3. dissolving sugar in water | |\n| 4. iron rusting | |\n| 5. hydrochloric acid and sodium hydroxide reacting and forming salt and water | |\n| 6. digesting food into nutrients | |\n| 7. melting ice into water | |\n| 8. acid rain dripping onto limestone and making carbon dioxide gas | |\n| 9. breaking glass into pieces | |\n| 10. hydrogen peroxide decomposing into oxygen gas and water | |

Answer

Explanation:

Step1: Analyze heating water into steam

Water changes from liquid to gas, but still H₂O. Physical change.

Step2: Analyze milk going sour

Chemical reaction occurs due to bacteria, new substances form. Chemical change.

Step3: Analyze dissolving sugar in water

Sugar disperses in water, no new substance chemically. Physical change.

Step4: Analyze iron rusting

Iron reacts with oxygen to form iron - oxide. Chemical change.

Step5: Analyze HCl and NaOH reaction

Acid - base reaction forms new substances (salt and water). Chemical change.

Step6: Analyze digesting food

Complex chemical reactions break food into nutrients. Chemical change.

Step7: Analyze melting ice into water

Ice changes from solid to liquid, still H₂O. Physical change.

Step8: Analyze acid rain on limestone

Acid - carbonate reaction produces CO₂ and new substances. Chemical change.

Step9: Analyze breaking glass

Glass shape changes, no new chemical substance. Physical change.

Step10: Analyze hydrogen peroxide decomposition

H₂O₂ breaks into O₂ and H₂O. Chemical change.

Answer:

  1. Physical change
  2. Chemical change
  3. Physical change
  4. Chemical change
  5. Chemical change
  6. Chemical change
  7. Physical change
  8. Chemical change
  9. Physical change
  10. Chemical change