II. Composition of Matter

II. Composition of Matter

Intentions for success: Sept. 6, 2018 3.1 Cell Theory We will be successful when we can classify matter by its composition. Vocab: Element, Compound, Colloid, Suspension, Solution Warm up: Matter surrounds us everywhere. What kind of properties would we use to classify all this matter? You mix two colorless liquids, the mixture turns green.

What type of change occurred? Why? How? MATTER Ch. 9 - Classification of Matter II. Composition of Matter (p.36-44) Matter Flowchart Pure Substances Mixtures A. Matter Flowchart MATTER yes

MIXTURE yes Is the composition uniform? Homogeneous Mixture (solution) no

Can it be separated by physical means? PURE SUBSTANCE no Heterogeneous Mixture yes Can it be decomposed by chemical means?

Compound no Element B. Pure Substances Element matter composed of identical atoms EX: copper

B. Pure Substances Compound matter composed of 2 or more elements in a fixed ratio properties differ from those of individual elements EX: salt (NaCl) C. Mixtures Variable combination of 2 or more pure

substances. Homogeneous Mixture (Solution) even distribution of components very small particles particles never settle EX: saline solution C. Mixtures Heterogeneous Mixture uneven distribution of components

colloids and suspensions EX: granite C. Mixtures Colloid medium-sized particles Tyndall effect - particles scatter light (looks cloudy) particles never settle EX: milk C. Mixtures

Suspension large particles particles scatter light particles will settle (needs to be shaken) EX: fresh-squeezed lemonade Review Questions Write down the answers as we discuss. 1. Why does every sample of a given

substance have the same properties? 2. Why is the composition of an element fixed? 3. What is the basis of classifying solutions, suspensions or colloids? Review Questions Write down the answers as we discuss. 4. Why can the properties of a mixture vary?

5. Describe the composition of a compound? Intentions for success: Sept. 7, 2018 3.1 Cell Theory We will be successful when we can prepare for the test Vocab: Molecule,

Compound, Element Warm up: What formulas and definitions will you put on your note card?

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