By Eiichiro Ochiai
Chemicals usually have a unfavorable snapshot one of the common public. yet there isn't any fabric international or certainly people with out chemical compounds. the fabric global is operated through chemical substances. The name ‘Chemicals for all times and dwelling’ means that the fabric international is staged and performed by means of chemical substances. The publication comprises 5 components and an appendix. half 1 – necessities for all times; half 2 – bettering overall healthiness; half three – For the joys of lifestyles; half four – Chemistry of the universe and earth, and half five - a few unwanted effects of chemical substances. The appendix offers a quick precis of what chemistry is all approximately, together with a quick bankruptcy of chemical ideas. No quantitative calculations are incorporated during this booklet in order that it really is attractive for everybody – not only chemists.
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The sea water is salty; it contains a lot of ionic compounds, the highest among which are sodium (Na+), potassium (K+), magnesium (Mg2+), and calcium (Ca2+) cations, and chloride (Cl−) and sulfate (SO42−) anions. 54 mol)/L) >SO42−. In addition, seawater contains a large variety of elements (their cations and anions). About 70 elements have been identified in seawater, and certainly others are also present but may not be detected by currently available techniques. Why is the seawater salty? The materials in seawater are supplied by the rivers that are not very salty.
The formation of water from an acid (H+) and a base (OH−) is a very strong reaction in the sense that the reaction gives off a lot of heat (energy) or more properly that the (Gibbs) free energy change is a large negative value. Formation of a bond always releases energy. 1) are accompanied by a relatively small change in the (Gibbs) free energy. 1). Or we may say that the bond formation is energy releasing, but the bond splitting is energy absorbing, and so that the energy change in a substitution reaction is small, as it involves both bond formation and bond cleavage.
Two amino acids, say, R1CH(NH2)COOH and R2CH(NH2)COOH combine in the following manner: ( ) R1CH (NH 2 ) COOH + (NH 2 )CH R 2 COOH ( ) → H 2 O + R1CH (NH 2 )− CONH − CH R 2 COOH In the process, one molecule of water is removed, and a new connection through a “–CO(NH)–” bridge (called “peptide bond”) is formed between the two amino acids. ” Condensation is a reaction in which two small molecules combine to form a larger molecule, usually shedding off a small molecule such as water as in the case above.