Concept: Mixtures and Pure Substances

1. Concept: Mixtures and Pure Substances

2. UEQ: How does the structure of matter influence its physical and chemical behavior?LEQ: How is matter classified? Bell Work 09/19/2012 Write question and answer. Can you chemically break down an atom? Why or why not? Too much energy is required to break an atom down into its protons, neutrons, and electrons alone. It would require a nuclear reaction to do this.

3. UEQ: UEQ: How does the structure of matter influence its physical and chemical behavior?LEQ: How is matter classified? Bell Work 10/05/2012 Write question and answer. Explain why is it easier to separate a heterogeneous mixture than a homogeneous mixture? In a heterogeneous mixture, you can identify the components of the mixture

4. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How is matter classified? • Vocabulary • Write word and definition. Underline and highlight vocabulary word. • Write word on front and definition on back of index cards. • Create a poem or rap of vocabulary words and definitions. • Create foldable with words and definitions. • Create a crossword puzzle using words and definitions. Also make answer key!!! • Heterogeneous mixture • Homogeneous mixture • Solution • Solute • Solvent • Suspension • Colloid

5. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How is matter classified? • What are atoms? • The smallest unit of an elementthat maintains the chemical propertiesof that element

6. UEQ: How does the structure of matter influence its physical and chemical behavior?LEQ: How is matter classified? • What is matter? • Anything with mass and volume(or takes up space) • Matter can be broken into two categories • Pure Substances(1st) • Mixtures

7. UEQ: How does the structure of matter influence its physical and chemical behavior?LEQ: How is matter classified? • Pure Substances • Definite composition/uniform/unchanging • Pure substances can be broken down further into two more categories: elements and compounds

8. UEQ: How does the structure of matter influence its physical and chemical behavior?LEQ: How is matter classified? • Elements • A substance that cannot be separated or broken down into simpler substances by chemical means • Found on periodic table

9. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How is matter classified? • Compounds • 2+ atoms chemically bound • Must break bonds to get elemental form • May form molecules • Water • Carbon dioxide • Law of Definite Proportions • The law that states that a chemical compound alwayscontains the same elementsin exactly the same proportions by weight or mass

10. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How is matter classified? • Mixtures • Contains 2+ kinds of matter physically mixed • Can be physically separated • Broken down into 2 main groups • Homogeneous • Heterogeneous

11. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? • Homogeneous Mixtures • Looks pureb/c evenly/uniformly mixed • Also called a solution • Solid in liquid (salt water) • Gas in liquid • Solid in solid • Alloys-mixture of 2+ metals • Solid at room temperature

12. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? solutions • Solute – substance being dissolved (sugar) • Solvent – substance doing the dissolving (water) RULE OF THUMB!!! USUALLY YOU WILL HAVE MORE SOLVENT THAN SOLUTE!!! • What is solubility? • Amountof solute that can be dissolved • Concentration – high C – high solute/solvent, low C – low solute/solvent

13. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? • Heterogeneous • Looks impure - Substances can be identified • Not uniform throughout b/c unevenly mixed • Examples: granite, wood, blood, tossed salad • Also called suspensions • Visible particles settle

14. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? • Colloids • Ex. Milk, fog, clay • Look like a solutionb/c particles do not settle, but acts like a suspension b/c particles do not dissolve • How can you tellif it is a colloid? • Tyndall effect – scattering of light by particles in a mixture

15. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous?

16. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? Bell Work 10-08-2012 Write Question and Answer How can you tell a solution, suspension, and colloid apart from one another? Differentiate between the 3.

17. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can substances be identified as homogeneous or heterogeneous? Bell Work 09-21-2012 Write Question and Answer How can you tell a solution, suspension, and colloid apart from one another? Differentiate between the 3. Solution is a homogeneous mixture where particles are uniform throughout and does not settle. Suspensions are heterogeneous mixtures that have particles that settle and it is not uniform throughout. Colloids fall in between solutions and suspensions in that it has particles that do not settle (like solutions); but, the particles do not dissolve (like in suspensions). You can also use the Tyndall effect to differentiate colloids from solutions because colloids will scatter the light.

18. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can the components of mixtures be separated? • Methods for separating mixtures • Distillation • Filtration • Chromatography

19. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can the components of mixtures be separated? • Distillation • Separating mixture by using differences in boiling points • Good for separating solutions • How? • Heat mixture to the b.p. of the substance with the lowest b.p. This will create a vapor first. Collect and condense into a liquid in a separate container. Continue process if solution contains more than 2 substances.

20. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can the components of mixtures be separated? • Filtration • Separating solid from liquid • Use porous barrier to separate

21. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can the components of mixtures be separated? • Chromatography • Separation technique that identifies parts of a mixture by how fast compounds move across a material • Greatest attraction moves the fastest

22. UEQ: In dealing with matter, how are composition, structure, properties and energy related? LEQ: How can the components of mixtures be separated? Write question and answer. Explain how you could separate sand and salt. You could first add water to the solid mixture to form salt water. Filter the salt water from the sand. This will leave sand in the filter and salt water in the container. Then, through distillation process, heat the salt water to the water’s boiling point so that you can collect and condense water vapor in separate container leaving only salt behind.