11. which picture(s) would best represent a rock? explain why.
12. if measurements of a gas are 100l and 300 kilopascals and then the gas is measured a second time and found to be 75l, describe what had to happen to the pressure (if temperature remained constant). include which law supports this observation. no calculations are required! (page 449)
matching: place the name of the scientist in the blank next to their ideas about the atom. (page 492)
democritus, thompson, rutherford, bohr
. he said that all positive charges were found in the central nucleus.
. he theorized that electrons were imbedded in the positive sphere, like a chocolate chip cookie.
. he believed electrons were in fixed orbits.
. he named the atom.
for question #12, use the following picture:
17. what element is this? how do you know? (page 495 and periodic table pages 500-501)
for questions 18-21, use the information on pages 590-592 and page 567. in each space, classify the reaction type.
18. 2libr + pb(no3) - pbbr2 + 2lino3
19. fe + 2hcl - fecl2 + h2
20. cao + h2o - ca(oh)2
21. nicl2 - ni + cl2. (the minus sign are meant to be arrows.
for questions 22 – 24, write an equation for the reaction of hydrogen chloride and sodium sulfide to produce hydrogen sulfide with sodium chloride. (page 582 and page 567-568)
22. show the formulas of the reactants.
23. show the formulas of the products.

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance