Chem 12-13 Flashcards
What category includes emulsions, foams, sols, and gel?
Colloid
What is a mixture containing tiny clumps or particles that remain suspended within the mixture and will not settle out?
Colloid
True or false— a catalyst increases the activation energy of a chemical reaction? 4.
False
What type of substance is the scattering of light known as the Tyndall effect a characteristic of ?
Colloid
- True or false— if two substances in the same phase are miscible , they are completely soluble in each other?
True
When a liquid in a closed container reaches a state of equilibrium with its vapor, which of the following is true? 7
The number of molecules evaporating and condensing are equal
What is the attraction of a substance to the surface of a solid called?
Adsorption
What is the total heat absorbed or released when one substance dissolves in another?
Enthalpy of solution
When a solution reaches a state of equilibrium, why does the amount of undissolved solid remain constant?
The rate of crystallization equals the rate of dissolution
What do colligative properties primarily depend upon?
Concentration of the solution
In a solution of glucose in water, what is the glucose?
Solute
- How does increasing concentration usually affect the rate of a reaction?
Increases the rate of reaction
- Describe chain reaction
A chemical reaction in which the products of one reaction step cause other reactions to occur
Describe enzyme
A protein catalyst found in living organisms
Describe inhibitor
A substance that slows down the rate of a reaction
Describe rate-determining step
A reaction in a proposed series that has a greater activation energy than the others and thus occurs more slowly
Describe reaction mechanism
A series of steps describing the way in which a chemical reaction proceeds
Describe solution
A homogeneous mixture of two or more substances