homework - due in class 9/18 (thursday)\nclassifying matter - classify the following examples as an element…

homework - due in class 9/18 (thursday)\nclassifying matter - classify the following examples as an element, compound, or mixture:\n1. ammonia nh₃ - compound\n2. hydrogen - element\n3. salt water nacl(aq) - mixture\n4. steel containing 3% carbon - compound\n5. sodium hydroxide naoh - compound\n6. mixture 1 (homogeneous/heterogeneous)\n7. mixture 2 (homogeneous/heterogeneous)\n8. describe the difference between a heterogeneous and homogeneous mixture:\na hetero mixture is a substance not mixed subsequently and a homo mixture is a substance mixed evenly.\nphases - 9. molecules of kcl in the solid phase\na. move slowly in straight lines\nb. move rapidly in straight lines\nc. are arranged in a regular geometric pattern\nd. are arranged in a random pattern\n10. draw a particle diagram of h₂o in the gaseous phase. use shading to differentiate hydrogen from oxygen.\ninformation about two mixtures at 20.°c\n|mixture 1|mixture 2|\n|--|--|\n|composition|nacl in h₂o|fe filings in h₂o|\n|student observations|colorless liquid\nno visible solid on bottom of beaker|colorless liquid\nblack solid on bottom of beaker|\n|other data|mass of nacl(s) dissolved = 2.9 g|mass of fe(s) = 15.9 g\ndensity of fe(s) = 7.87 g/cm³|

homework - due in class 9/18 (thursday)\nclassifying matter - classify the following examples as an element, compound, or mixture:\n1. ammonia nh₃ - compound\n2. hydrogen - element\n3. salt water nacl(aq) - mixture\n4. steel containing 3% carbon - compound\n5. sodium hydroxide naoh - compound\n6. mixture 1 (homogeneous/heterogeneous)\n7. mixture 2 (homogeneous/heterogeneous)\n8. describe the difference between a heterogeneous and homogeneous mixture:\na hetero mixture is a substance not mixed subsequently and a homo mixture is a substance mixed evenly.\nphases - 9. molecules of kcl in the solid phase\na. move slowly in straight lines\nb. move rapidly in straight lines\nc. are arranged in a regular geometric pattern\nd. are arranged in a random pattern\n10. draw a particle diagram of h₂o in the gaseous phase. use shading to differentiate hydrogen from oxygen.\ninformation about two mixtures at 20.°c\n|mixture 1|mixture 2|\n|--|--|\n|composition|nacl in h₂o|fe filings in h₂o|\n|student observations|colorless liquid\nno visible solid on bottom of beaker|colorless liquid\nblack solid on bottom of beaker|\n|other data|mass of nacl(s) dissolved = 2.9 g|mass of fe(s) = 15.9 g\ndensity of fe(s) = 7.87 g/cm³|

Answer

Explanation:

Step1: Define homogeneous and heterogeneous mixtures

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non - uniform composition with visible different parts.

Step2: Analyze Mixture 1

NaCl in H₂O forms a solution where the salt is uniformly dissolved in water. There are no visible separate parts. So, Mixture 1 is homogeneous.

Step3: Analyze Mixture 2

Fe filings in H₂O have a black solid (Fe filings) at the bottom of the beaker. The composition is not uniform as there are distinct solid and liquid parts. So, Mixture 2 is heterogeneous.

Step4: Answer question 9

In the solid phase, molecules of KCl are arranged in a regular geometric pattern (lattice structure). So the answer is c.

Step5: Regarding question 10

In the gaseous phase of H₂O, water molecules are far apart and move freely. For a particle diagram, you can draw small circles to represent hydrogen atoms (lightly shaded) and larger circles to represent oxygen atoms (darker shaded), with the molecules separated from each other.

Answer:

  1. Homogeneous
  2. Heterogeneous
  3. c. Are arranged in a regular geometric pattern
  4. Draw separate H₂O molecules with hydrogen atoms (lightly shaded) and oxygen atoms (darker shaded) far apart to represent the gaseous phase.