Answer the following question given this paragraph: In all the previous calculations we have performed involving balanced chemical equations, we made two assumptions: (1) the reaction goes exactly as written, and (2) the reaction proceeds completely. In reality, such things as side reactions occur that make some chemical reactions rather messy. For example, in the actual combustion of some carbon-containing compounds, such as methane, some CO is produced as well as CO2. However, we will continue to ignore side reactions, unless otherwise noted. The second assumption, that the reaction proceeds completely, is more troublesome. Many chemical reactions do not proceed to completion as written, for a variety of reasons (some of which we will consider in Chapter 13 "Chemical Equilibrium"). When we calculate an amount of product assuming that all the reactant reacts, we calculate the theoretical yield, an amount that is theoretically produced as calculated using the balanced chemical reaction. In many cases, however, this is not what really happens. In many cases, lesssometimes much lessof a product is made during the course of a chemical reaction. The amount that is actually produced in a reaction is called the actual yield. By definition, the actual yield is less than or equal to the theoretical yield. If it is not, then an error has been made. Both theoretical yields and actual yields are expressed in units of moles or grams. It is also common to see something called a percent yield. The percent yield is a comparison between the actual yield and the theoretical yield and is defined as Saylor URL: http://www. saylor. org/books. Q: What is the amount actually produced in a reaction called? Choices: - individual yield - maximum yield - minimum yield - actual yield A:
actual yield
(Question)
Answer the following question given this paragraph: Larger cycloalkanes also exist, but are less common. Cyclic hydrocarbons may also be unsaturated. A cycloalkene is a cyclic hydrocarbon with at least one carbon-carbon double bond. A cycloalkyne is a cyclic hydrocarbon with at least one carbon-carbon triple bond. Shown below are the simplified structural formulas for cyclohexene and cyclooctyne. Q: What's the term for a cyclic hydrocarbon with a carbon-carbon triple bond? Choices: - bialkyne - tricycloalkyne - bicycloalykne - cycloalkyne A:
(Answer)
cycloalkyne
Ques: Answer the following question given this paragraph: The variable is the speed of light. For the relationship to hold mathematically, if the speed of light is used in m/s, the wavelength must be in meters and the frequency in Hertz. Q: The variable is the speed of light. for the relationship to hold mathematically, if the speed of light is used in m/s, the wavelength must be in meters and the frequency in what? Choices: - gigawatts - miles - centimeters - hertz A:
Ans: hertz
(Q).
Answer the following question given this paragraph: Q: The effects of which kind of selection are larger than the effects of direct natural selection on individuals? Choices: - topical selection - stranger selection - unnatural selection - kin selection A:
(A).
kin selection
Ques:Answer the following question given this paragraph: 4. State how phagocytosis helps defend the body from pathogens. Q: What does phagocytosis defend the body from? Choices: - allergies - obesity - parasites - pathogens A:

Ans:pathogens
Answer the following question given this paragraph: larger cities and economic growth therein leads to the construction of dams, the consequent flooding of ecosystems, and increased emissions of pollutants. Other threats to tropical forests come from poachers, who log trees for their precious wood. Ebony and Brazilian rosewood, both on the endangered list, are examples of tree species driven almost to extinction by indiscriminate logging. The number of plant species becoming extinct is increasing at an alarming rate. Because ecosystems are in a delicate balance, and seed plants maintain close symbiotic relationships with animalswhether predators or pollinatorsthe disappearance of a single plant can lead to the extinction of connected animal species. A real and pressing issue is that many plant species have not yet been catalogued, and so their place in the ecosystem is unknown. These unknown species are threatened by logging, habitat destruction, and loss of pollinators. They may become extinct before we have the chance to begin to understand the possible impacts from their disappearance. Efforts to preserve biodiversity take several lines of action, from preserving heirloom seeds to barcoding species. Heirloom seeds come from plants that were traditionally grown in human populations, as opposed to the seeds used for large-scale agricultural production. Barcoding is a technique in which one or more short gene sequences, taken from a well-characterized portion of the genome, are used to identify a species through DNA analysis. Q: What type of seeds come from plants that were traditionally grown in human populations, as opposed to the seeds used for large-scale agricultural production? Choices: - old-fashioned seeds - modified seeds - original seeds - heirloom seeds A:
heirloom seeds