exam 1

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exam 1
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2013-04-21 13:39:58
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exam chemistry 121 chemeketa community college
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exam 1
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  1. what's the relationship between the temperature of gas and its volume?
    Volume increases with temperature.
  2. What is the smallest particle of an element that can exist?
    an atom
  3. What's the most abundant element in Earth's crust, atmosphere, and oceans?
    oxygen
  4. Metal or non-metal:
    lustrous, malleable, conduct heat and electricity, ductile, high density, high melting point.
    metal
  5. metal or non-metal:
    dull, brittle, poor conductors of heat and electricity, non-ductile, low density, low melting point
    non-metal
  6. What type of element has characteristics between metals and non-metals, and list
    metalloids (don't need to know metalloids): Boron, silicon, Germanium, Arsenic, Antimony (SB), & Tellurium.

    (Big sisters get arsenic sober teddies)
  7. What group of elements are nonreactive and found as elements in nature
    noble gasses, because they have a full shell, they're least reactive and found uncombined in nature.
  8. List 7 diatomic molecules:
    I, H, N, F, Cl, O, Br

    (I have never found clubs on board).
  9. What kind of bond do t non-metals make
    a molecular/covalent bond
  10. what kind of bond does a metal and nonmetal make
    ionic bond
  11. how are molecules held together
    by shared electron
  12. how are ionic compounds held together
    negative and positive force
  13. Do metals form cations or anions, and do they have a negative or positive charge?
    Metals form cations with a positive charge
  14. What is the difference between a pure substance and homogeneous mixture
    the pure substance has a fixed compound formula, and can not be broken down without undergoing chemical change. 

    The mixture can be separated without undergoing chemical change, and has varying composition.
  15. What is an alloy
    a mixture of metals (e.g. steel is an alloy of iron).
  16. what is a percipitate
    the deposit of a substance in solid form.
  17. What is a filtrate
    the liquid that has passed through a filter.
  18. what is a reactant
    the starting substances to needed to undergo change
  19. what is the product
    the substance produced in a reaction
  20. Law of conservation:
    Energy/mass can not be created or destroyed.
  21. Potential energy is? List example
    • potential energy stored energy.
    •  (e.g. gasoline burning is potential energy in the chemical bonds breaking to form kinetic energy).
  22. What is the relationship of the following: Kcal, J, Cal, and cal?
    • Cal and Kcal are 1000X cal. 
    • 1 cal= 4.184 Joules, which is the amount of energy needed to increase the temp of H2O 1 degree (like specific heat is for other elements).
  23. temperature is
    the intensity of thermal energy (how hot the system is) that is proportional to it's kinetic energy.
  24. what is heat:
    heat is the amount of energy transfer.
  25. formula for heat
    (Mass g)X(Specific heat)(Delta T)

    *Delta T is the final temp minus the initial temp.

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