Why do elements form compounds? List some of the uses of the noble gases and reasons for those uses. What is the main reason why there is heavy water in a nuclear reactor? Why are nonmetals good oxidizing agents? Why is it important in this experiment to be accurate in all your measure...
Give three reasons why carbon is preferred over hydrogen in the relative atomic mass of an atom. What is the reason that chemists categories Fe, Co and Ni in the same group VIIIB? Why do elements form compounds? Why is iodine sometimes introduced into a tungsten lamp?
Proteins are polymers, and yet the language used in describing their thermodynamics and kinetics is most often that of small molecules. Using the terminology and mathematical descriptions of small molecules impedes understanding why proteins have evolved to be big in comparison. Many properties of the ...
compounds. For example, plants, trees, snakes, lizards, frogs, fungi, corals and fish have all yielded potent lead compounds which have either resulted in clinically useful drugs or have the potential to do so. There is a good reason why nature should be so rich 正在翻译,请等待...[...
The term "Vitamin B12" refers to a group of cobalamin compounds, of which the most frequently used is cyanocobalamin. All vitamin B12 found in nature is made by microorganisms (bacteria essentially), and none is found in sterile plants. In the early to mid 1800s, an unrecognized vitamin B12...
A class of plant hormones (especially INDOLE-3-ACETIC ACID (IAA) and similar compounds) that control cell division, cell expansion and differentiation. Cambium A population of stem cells that sustain the production of vascular tissues in higher plants. They allow the stem and the root to increas...
Melatonin comes form the remnant of the body of our 'third eye'. This, ourpineal gland, contains light-sensitive cells and monitors our environment. It keeps our body in tune with daily and seasonal rhythms and changes. Hence, we are synchronous with nature; rest and sleep when it is dark...
If any of the macronutrients are missing or hard to obtain from thesoil, this will limit the growth rate for the plant. In nature, the nitrogen, phosphorous and potassium often come from the decay of plants that have died. In the case of nitrogen, the recycling ofnitrogenfrom dead to liv...
Why do cis and trans isomeric compounds exhibit different properties? Why are the properties of alloys generally superior to their constituent components? Using the activity series, explain the reason that most metals cannot exist in nature as elements but are found as compounds inst...
Which of the following compounds will form hydrogen bonds with water? (a) CH_3CH_2OCH_2OH (b) CH_3CH_2CH_2F (c) CH_3CH_2CH_2NHCH_3 (d) CH_3CH_2CH_2COOH (e) CH_3CH_2N(CH_3)_2. What joins the two strands of the...