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15 Cards in this Set

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