13. classify the following as pure substances or as mixtures: air, gasoline, grain alcohol, water, sugar…

13. classify the following as pure substances or as mixtures: air, gasoline, grain alcohol, water, sugar, gold, mercury, oxygen, salt water\n14. classify the following as heterogeneous or as homogeneous: sand & salt mixture, hydrogen, iron, salt water, unfiltered air, iron with rust, pure water, an apple, nitric acid, tossed salad, granite, wood\n15. classify the following as an element, a compound, a solution, or a heterogeneous mixture: aluminum, raisin bread, carbon dioxide, water, sugar and water, sulfur, sulfuric acid, mercury, an orange, water & instant coffee, a pencil, carbon particles & sugar, nitrogen, air, gasoline, grain alcohol

13. classify the following as pure substances or as mixtures: air, gasoline, grain alcohol, water, sugar, gold, mercury, oxygen, salt water\n14. classify the following as heterogeneous or as homogeneous: sand & salt mixture, hydrogen, iron, salt water, unfiltered air, iron with rust, pure water, an apple, nitric acid, tossed salad, granite, wood\n15. classify the following as an element, a compound, a solution, or a heterogeneous mixture: aluminum, raisin bread, carbon dioxide, water, sugar and water, sulfur, sulfuric acid, mercury, an orange, water & instant coffee, a pencil, carbon particles & sugar, nitrogen, air, gasoline, grain alcohol

Answer

Brief Explanations:

  1. Pure substances have a fixed - composition, mixtures have variable composition. Air is a mixture of gases, gasoline is a mixture of hydrocarbons, grain alcohol is a mixture (usually contains water), water is a pure substance (compound), sugar is a pure substance (compound), gold is a pure substance (element), mercury is a pure substance (element), oxygen is a pure substance (element), salt water is a mixture.
  2. Homogeneous mixtures have uniform composition, heterogeneous mixtures have non - uniform composition. Sand & salt mixture is heterogeneous, hydrogen is homogeneous (element), iron is homogeneous (element), salt water is homogeneous, unfiltered air is homogeneous, iron with rust is heterogeneous, pure water is homogeneous, an apple is heterogeneous, nitric acid is homogeneous, tossed salad is heterogeneous, granite is heterogeneous, wood is heterogeneous.
  3. Elements are made of one type of atom, compounds are made of different types of atoms chemically bonded, solutions are homogeneous mixtures, and heterogeneous mixtures have non - uniform composition. Aluminum is an element, carbon dioxide is a compound, sugar and water is a solution, sulfuric acid is a compound, an orange is a heterogeneous mixture, a pencil is a heterogeneous mixture, nitrogen is an element, gasoline is a solution, raisin bread is a heterogeneous mixture, water is a compound, sulfur is an element, mercury is an element, water & instant coffee is a solution, carbon particles & sugar is a heterogeneous mixture, air is a solution, grain alcohol is a solution.

Answer:

Air: Mixture Gasoline: Mixture Grain alcohol: Mixture Water: Pure substance Sugar: Pure substance Gold: Pure substance Mercury: Pure substance Oxygen: Pure substance Salt water: Mixture 14. Sand & salt mixture: Heterogeneous Hydrogen: Homogeneous Iron: Homogeneous Salt water: Homogeneous Unfiltered air: Homogeneous Iron with rust: Heterogeneous Pure water: Homogeneous An apple: Heterogeneous Nitric acid: Homogeneous Tossed salad: Heterogeneous Granite: Heterogeneous Wood: Heterogeneous 15. Aluminum: Element Carbon dioxide: Compound Sugar and water: Solution Sulfuric acid: Compound An orange: Heterogeneous mixture A pencil: Heterogeneous mixture Nitrogen: Element Gasoline: Solution Raisin bread: Heterogeneous mixture Water: Compound Sulfur: Element Mercury: Element Water & instant coffee: Solution Carbon particles & sugar: Heterogeneous mixture Air: Solution Grain alcohol: Solution