user: Answer the following question given this paragraph:   The major cause of outdoor air pollution is the burning of fossil fuels.   Q: The major cause of outdoor air pollution is the burning of?   Choices:  - trees  - trash  - charcoal briquettes  - fossil fuels  A:
fossil fuels


(Question)
Answer the following question given this paragraph:   Tadpoles go through many changes to become adult frogs.   Q: What do tadpoles change into?   Choices:  - reptiles  - toads  - mud puppies  - adult frogs  A:
(Answer)
adult frogs


Ques: Answer the following question given this paragraph:   Figure 14.11 Vinegar is a solution of acetic acid, a weak acid. (credit: modification of work by “HomeSpot HQ”/Flickr).   Q: Vinegar is a solution of which acid?   Choices:  - boric  - magnesium  - crystalline  - acetic  A:
Ans: acetic


(Q).
Answer the following question given this paragraph:   Polar tundra climates occur near the poles. Tundra climates have permafrost. Permafrost is layer of ground below the surface that is always frozen, even in the summer. Only small plants, such as mosses, can grow in this climate.   Q: What is the layer of ground below the surface that is always frozen, even in the summer?   Choices:  - tundra  - bedrock  - upper crust  - permafrost  A:
(A).
permafrost


Ques:Answer the following question given this paragraph:   Fossils of ocean animals are found at the top of Mt. Everest. Mt. Everest is the highest mountain on Earth. These fossils show that the area was once at the bottom of a sea. The seabed was later uplifted to form the Himalaya mountain range. An example is shown in the Figure below .   Q: What evidence is there that mt. everest was once at the bottom of a sea?   Choices:  - skulls  - corals  - glaciers  - fossils  A:

Ans:fossils


Ques:Answer the following question given this paragraph:   In catalysis, if a molecule forms strong bonds to the catalyst, then the catalyst may become poisoned. Experiments on various catalysts showed the following results: a. Fe, Ru, and Os form weak bonds with N2; however, O2, alkynes, alkenes, CO, H2, and CO2 interact more strongly. CO2 and H2 form weak bonds with a Co or Ni surface. Rh, Pd, Ir, and Pt form weak bonds with H2 but do not bond with CO2. Cu, Ag, and Au form weak bonds with CO and ethylene. Explain why Fe was chosen as a catalyst to convert nitrogen and hydrogen to ammonia. Why is Fe more suitable than Ru or Os? f. Because alkenes generally interact more strongly with metal surfaces than does H 2, what catalyst would you choose for hydrogenation of an alkene such as ethylene? g. Although platinum is used in catalytic converters for automobile exhaust, it was not found to be a particularly effective catalyst for the reaction of H2 with a mixture of carbon monoxide and carbon dioxide to produce methane. Why? h. If you were interested in developing a catalyst to reversibly bind ethylene, which of the catalysts listed here would you choose? 14. Nonstoichiometric metal oxides can be effective catalysts for oxidation–reduction reactions. One such catalyst is Ni1−xO, found to be effective for converting CO to CO2when oxygen is present. Why is it so effective? 15. The chemical reactions in an organism can be controlled by regulating the activity of certain enzymes. Efficient regulation results in an enzyme being active only when it is needed. For example, if a cell needed.   Q: What happens if a molecule forms strong bonds to the catalyst?   Choices:  - molecules gets poisoned  - surface gets poisoned  - membrane gets poisoned  - catalyst gets poisoned  A:

Ans:

assistant: catalyst gets poisoned