Wednesday, March 18, 2020

Schindlers list essays

Schindler's list essays The movie Schindlers List touched me in many ways. I didnt realize the extent of the horror that the Jews faced. The thought that someone could come and barge in to my house and take all my belongings scares me. I now feel more sympathy than ever for the Jews who had to suffer through this horrible ordeal. The girl in the red dress really touched me, and I think it was the turning point for Schindler to start his factory of Jews when he saw her at the crematorium. The fact that she was the only person in color made it obvious that she played in important role in the faith of the Jews. Schindler first sees her as an innocent young girl walking along the streets of the ghetto. He later spots her body being wheeled off to be burned. The young girl in the red dress symbolizes the hope the Jews had. In the beginning of the movie, the Jews hope was pretty high, and most people expected to be freed sooner or later. As things became progressively worse, the hope for any liberation went down, and all hope died as the girl in the red dress was being carried to be burned. Schindler notices this, and he then takes the initiative to change the situation by hiring Jews as ammunition factory workers. Also, her death can be viewed as the most angelic and innocent child suffering the wrath of the co ncentration camps. I also liked how Schindler changes during the movie. He starts out as a Nazi party member, who enjoyed partying and spending time with women. As he witnesses the horrible things being done to the Jews, he realizes that he needs to make some efforts to save at least some of the Jews. Since he had already developed a relationship with many of his employees (the Jews), Schindler was able to feel the harshness much more than any other German. I admire his skills and determination that help him do what he needs to do to get the job done. Even if it included bribes, Schindler was bent upon keeping the Jews from being ...

Monday, March 2, 2020

Formulas of Ionic Compounds

Formulas of Ionic Compounds Ionic compounds form when positive and negative ions share electrons and form an ionic bond. The strong attraction between positive and negative ions often produce  crystalline solids that have high melting points. Ionic bonds form instead of covalent bonds when there is a large difference in electronegativity between the ions. The positive ion, called a cation, is listed first in an ionic compound formula, followed by the negative ion, called an anion. A balanced formula has a neutral electrical charge or net charge of zero. Determining the Formula of an Ionic Compound A stable ionic compound is electrically neutral, where electrons are shared between cations and anions to complete outer electron shells or octets. You know you have the correct formula for an ionic compound when the positive and negative charges on the ions are the same or cancel each other out. Here are the steps for writing and balancing the formula: Identify the cation ( the portion with a positive charge). It is the least electronegative (most electropositive) ion. Cations include metals and they are often located on the left-hand side of the periodic table.Identify the anion ( the portion with a negative charge). It is the most electronegative ion. Anions include halogens and nonmetals. Keep in mind, hydrogen can go either way, carrying either a positive or negative charge.Write the cation first, followed by the anion.Adjust the subscripts of the cation and anion so the net charge is 0. Write the formula using the smallest whole number ratio between the cation and anion to balance charge. If the charges of the cation and anion are equal (e.g., 1/-1, 2/-2, 3/-3), then combine the cation and anion in a 1:1 ratio. An example is potassium chloride, KCl. Potassium (K) has a 1- charge, while chlorine (Cl-) has a 1- charge. Note that you do not ever write a subscript of 1.If the charges on the cation and the anion are not equal, add subscripts as needed to the ions to balance the charge. The total charge for each ion is the subscript multiplied by the charge. Adjust the subscripts to balance charge. An example is sodium carbonate, Na2CO3. The sodium ion has a 1 charge, multiplied by the subscript 2 to get a total charge of 2. The carbonate anion (CO3-2) has a 2- charge, so there is no additional subscript.If you need to add a subscript to a polyatomic ion, enclose it in parentheses so it is clear the subscript applies to the entire ion and not to an individual atom. An example is aluminum sulfate, Al2(SO4)3. The parenthesis around the sulfate anion indicates three of the 2- sulfate ions are needed to balance 2 of the 3 charged aluminum cations. Examples of Ionic Compounds Many familiar chemicals are ionic compounds. A metal bonded to a nonmetal is a dead giveaway that youre dealing with an ionic compound. Examples include salts, such as table salt (sodium chloride or NaCl) and copper sulfate (CuSO4). Compound Name Formula Cation Anion lithium fluoride LiF Li+ F- sodium chloride NaCl Na+ Cl- calcium chloride CaCl2 Ca2+ Cl- iron(II) oxide FeO Fe2+ O2- aluminum sulfide Al2S3 Al3+ S2- iron(III) sulfate Fe2(SO3)3 Fe3+ SO32- Ionic Compound Formulas