19.3-1. diffusion of co2 through rubber. a flat plug 30 mm thick having an area of 4.0 × 10 –4m2 and made of vulcanized rubber is used for closing an opening in a container. the gas co2 at 25°c and 2.0 atm pressure is inside the container. calculate the total leakage or diffusion of co2 through the plug to the outside in kg mol co2 /s at steady state. assume that the partial pressure of co2 outside is zero. from barrer (b1), the solubility of the co2 gas is 0.90 m3 gas (at stp of 0°c and 1 atm) per m3 rubber per atm pressure of co2 . the diffusivity is 0.11 × 10 –9m2 /s.

Which of the following electromagnetic waves can create ions?

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

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.