1. classify each of the following as a homogeneous or heterogeneous substance.\n a. iron ore\n b. quartz\n…

1. classify each of the following as a homogeneous or heterogeneous substance.\n a. iron ore\n b. quartz\n c. granite\n d. energy drink\n e. oil - and - vinegar salad dressing\n f. salt\n g. rainwater\n h. nitrogen\n2. classify each of the following as a physical or chemical change.\n a. ice melting\n b. paper burning\n c. metal rusting\n d. gas pressure increasing\n e. liquid evaporating\n f. food digesting\n3. compare a physical change with a chemical change.

1. classify each of the following as a homogeneous or heterogeneous substance.\n a. iron ore\n b. quartz\n c. granite\n d. energy drink\n e. oil - and - vinegar salad dressing\n f. salt\n g. rainwater\n h. nitrogen\n2. classify each of the following as a physical or chemical change.\n a. ice melting\n b. paper burning\n c. metal rusting\n d. gas pressure increasing\n e. liquid evaporating\n f. food digesting\n3. compare a physical change with a chemical change.

Answer

Brief Explanations:

  1. a. iron ore: Heterogeneous as it has varying compositions.
    • b. quartz: Homogeneous, a pure - like mineral.
    • c. granite: Heterogeneous, composed of different minerals.
    • d. energy drink: Homogeneous if well - mixed, uniform appearance.
    • e. oil - and - vinegar salad dressing: Heterogeneous, oil and vinegar separate.
    • f. salt: Homogeneous, a pure compound.
    • g. rainwater: Homogeneous if pure, but can be heterogeneous with impurities.
    • h. nitrogen: Homogeneous, a pure element.
  2. a. ice melting: Physical change, change of state without new substances.
    • b. paper burning: Chemical change, new substances like ash and gases formed.
    • c. metal rusting: Chemical change, metal reacts with oxygen to form rust.
    • d. gas pressure increasing: Physical change, change in physical property without new substances.
    • e. liquid evaporating: Physical change, change of state.
    • f. food digesting: Chemical change, complex substances broken down into new substances.
  3. A physical change involves a change in physical properties like state, shape, or size without changing the chemical composition of the substance. A chemical change results in the formation of new substances with different chemical properties through chemical reactions.

Answer:

    • a. Heterogeneous
    • b. Homogeneous
    • c. Heterogeneous
    • d. Homogeneous
    • e. Heterogeneous
    • f. Homogeneous
    • g. Can be Homogeneous or Heterogeneous
    • h. Homogeneous
    • a. Physical change
    • b. Chemical change
    • c. Chemical change
    • d. Physical change
    • e. Physical change
    • f. Chemical change
  3. Physical change: Change in physical properties without new substances. Chemical change: Formation of new substances with different chemical properties.