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15 Cards in this Set
- Front
- Back
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Describe, give examples of physical changes.
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a change in form/appearance, without changing composition. ex: grinding, cutting, breaking, condensation, vaporization, solidification, fusion, mixtures.
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Types of compounds that are electrolytes and non-electrolytes.
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electrolytes: NaCl (bonds ionically)
non-electrolytes: sucrose C12H22O11 (bonds covalently) |
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Factors that determine the amount of solute that dissolves.
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if it's concentrated/dilute, solubility, molarity.
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Describe the solution process.
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*solute particles separate
*solvent particles separate solute & solvent particles get closer |
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How does dissolving of electrolytes differ from dissolving of non-electrolytes?
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electrolytes conduct electricity, & non-electrolytes don't.
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Why do electrolytes conduct electricity?
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electrolytes provide ions of both positive and negative charges in water.
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List 3 ways to get a solid to dissolve faster, & explain why each method works.
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stir - carries away already dissolved particles, carries fresh liquid to crystal.
heat - increased motion of particles away increases solubility. powder - solution occurs at the surface, & powdering increases surface area. |
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When a solid is dissolved in a liquid, what happens to the boiling & melting points of the liquid?
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boiling point rises, melting point lowers
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List some applications of dissolving a solid in a liquid.
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antifreeze - so the car won't freeze/overheat.
salt - for making streets have lower melting points. |
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List some examples of emulsions.
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oil and water, whole milk
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List some examples of emulsifiers.
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mayonnaise, kerosene, water
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Describe a chemical change.
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the process in which atoms are rearranged or exchanged between 2 compounds.
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How can you identify a chemical change?
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*change in color
*evolution of gas (bubbles) *formation of an insoluble solid *release/uptake of energy |
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Outline the steps in writing a balanced chemical equation.
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*identify all materials involved
*writer proper formulas for all materials *balance the equation |
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What are the 4 types of chemical changes?
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1)synthesis
2)decomposition 3)single-displacement 4)double-displacement |
