elements, molecules, compounds, mixtures\nclassify each of the materials below. in the center column, state…
elements, molecules, compounds, mixtures\nclassify each of the materials below. in the center column, state whether the material is a pure substance or a mixture. if the material is a pure substance, further classify it as either an element, molecule, and/or compound in the right column. similarly, if the material is a mixture, further classify it as homogenous or heterogenous in the right column.\nmaterial pure substance or mixture element / molecule / compound homogenous / heterogenous\nsugar + pure water (c₁₂h₂₂o₁₁ + h₂o)\niron filings (fe)\nlimestone (caco₃)\norange juice (no pulp)\npacific ocean\nair inside a balloon\naluminum (al)\nbromine (br₂)\nacetylene (c₂h₂)\ntap water in a glass\nsoil\npure water (h₂o)\nchromium (cr)\nchex mix\nsalt + pure water (nacl + h₂o)\nbenzene (c₆h₆)\nmuddy water\nbrass (cu mixed with zn)
Answer
Explanation:
Step1: Recall definitions
A pure substance is either an element or a compound. An element consists of only one - type of atom, a compound consists of two or more different types of atoms chemically bonded. A mixture is a combination of two or more substances that are not chemically combined. A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non - uniform composition.
Step2: Analyze Sugar + Pure Water
It is a mixture. Sugar dissolves in water to form a homogeneous mixture.
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Step3: Analyze Iron Filings (Fe)
It is a pure substance and an element.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Element
Step4: Analyze Limestone ($CaCO_3$)
It is a pure substance and a compound.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Compound
Step5: Analyze Orange Juice (no pulp)
It is a mixture and homogeneous.
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Step6: Analyze Pacific Ocean
It is a mixture and heterogeneous (due to presence of salts, sand, organisms etc. in non - uniform distribution).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Heterogenous
Step7: Analyze Air inside a balloon
It is a mixture and homogeneous (a well - mixed combination of gases).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Step8: Analyze Aluminum (Al)
It is a pure substance and an element.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Element
Step9: Analyze Bromine ($Br_2$)
It is a pure substance and a molecule (a diatomic molecule of the same element).
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Molecule
Step10: Analyze Acetylene ($C_2H_2$)
It is a pure substance and a compound.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Compound
Step11: Analyze Tap water in a glass
It is a mixture and homogeneous (contains dissolved minerals etc. uniformly).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Step12: Analyze Soil
It is a mixture and heterogeneous (contains different particles like sand, clay, organic matter etc. non - uniformly).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Heterogenous
Step13: Analyze Pure Water ($H_2O$)
It is a pure substance and a compound.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Compound
Step14: Analyze Chromium (Cr)
It is a pure substance and an element.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Element
Step15: Analyze Chex Mix
It is a mixture and heterogeneous (contains different types of snacks non - uniformly).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Heterogenous
Step16: Analyze Salt + Pure Water ($NaCl + H_2O$)
It is a mixture and homogeneous.
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Step17: Analyze Benzene ($C_6H_6$)
It is a pure substance and a compound.
- Pure Substance or Mixture: Pure Substance
- Element / Molecule / Compound Homogenous / Heterogenous: Compound
Step18: Analyze Muddy Water
It is a mixture and heterogeneous (mud particles are not uniformly distributed).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Heterogenous
Step19: Analyze Brass (Cu mixed with Zn)
It is a mixture and homogeneous (an alloy is a homogeneous mixture of metals).
- Pure Substance or Mixture: Mixture
- Element / Molecule / Compound Homogenous / Heterogenous: Homogenous
Answer:
| Material | Pure Substance or Mixture | Element / Molecule / Compound Homogenous / Heterogenous |
|---|---|---|
| Sugar + Pure Water ($C_{12}H_{22}O_{11}+H_2O$) | Mixture | Homogenous |
| Iron Filings (Fe) | Pure Substance | Element |
| Limestone ($CaCO_3$) | Pure Substance | Compound |
| Orange Juice (no pulp) | Mixture | Homogenous |
| Pacific Ocean | Mixture | Heterogenous |
| Air inside a balloon | Mixture | Homogenous |
| Aluminum (Al) | Pure Substance | Element |
| Bromine ($Br_2$) | Pure Substance | Molecule |
| Acetylene ($C_2H_2$) | Pure Substance | Compound |
| Tap water in a glass | Mixture | Homogenous |
| Soil | Mixture | Heterogenous |
| Pure Water ($H_2O$) | Pure Substance | Compound |
| Chromium (Cr) | Pure Substance | Element |
| Chex Mix | Mixture | Heterogenous |
| Salt + Pure Water ($NaCl + H_2O$) | Mixture | Homogenous |
| Benzene ($C_6H_6$) | Pure Substance | Compound |
| Muddy Water | Mixture | Heterogenous |
| Brass (Cu mixed with Zn) | Mixture | Homogenous |