QUIZ IN STOICHIOMETRY ESSAY, Quizzes of Chemistry

Download QUIZ IN STOICHIOMETRY ESSAY and more Quizzes Chemistry in PDF only on Docsity! 1. Describe the domains of chemistry and give example of each. Answer: Chemistry has three domains known as microscopic domain, macroscopic domain, and symbolic domain. Most subject of microscopic domain such as atoms and molecules are too small to be seen even with standard microscopes and often must be pictured in the mind (ex, Bacteria and Viruses). Macroscopic domain is large enough to be sensed directly by human sight or touch (ex, The food we eat). The symbolic domain contains the specialized language used to represent components of the microscopic and macroscopic domains (ex, Chemical formulas and chemical equations). 2. In your own understanding, what is the difference between an atom and a molecule? Answer: In my own understanding, atom is a single neutral particle that retains all of the chemical properties of an element while molecule is a neutral particle made of two or more atoms bonded together. 3. Differentiate ions and isotopes. Answer: An ton is an atom that gained or lost electrons and has a negative or positive charge while isotopes are atom that have the same numbers of protons but different numbers of neutrons. 4. In your own words, discuss the types of chemical bonding. Answer: In chemistry, we have two types of chemical bonding which are the ionic bond and the covalent bond. Let us first discuss the ionic bonding, this type of chemical bonding involves a transfer of an electron thus one atom gains an electron while one atom loses an electron. For further understanding, I will use the sodium chloride (NaCl) as an example to illustrate the transfer of electrons between atoms. Considering that a sodium is a metal atom and chlorine is a non-metal atom. This bonding will occur when a sodium gives negative charge to chlorine and as a return it carries positive charge to sodium which end up with positive charge for sodium and negative charge for chlorine atom. As we've learn before opposite charges attract, the atoms bond together to form sodium chloride. In the case of covalent bond, the transfer of electrons between atoms are not applicable but only sharing of electrons will occur. The pair of shared electrons forms a new orbit that extends around the nuclei of both atoms, producing a molecule. Hence covalent bond has two secondary types known as polar bonds and hydrogen bonds. 5. In your own words, describe the structure of an atom. Answer: Atom is a basic unit of chemical elements. The structure of an atom contains subatomic particles in their nucleus and in the electron cloud that surround the nucleus. These subatomic particles include protons and neutrons which are located in the nucleus and electrons which are located in the cloud or field that surrounds the nucleus. Protons have a positive electrical charge, neutrons are uncharged and electrons have negative electrical charge. 6. Explain the difference between molecular, empirical, and structural formulas. Answer: To explain the difference between molecular, empirical and structural formulas, I will begin with an example. Consider the formula for Ethane (C,Hg), this formula is called regular formula which exactly tells how many atoms of each element are in a compound so that is also Rnown as molecular formula. If we get the ratio of an atoms of the said compound, we can have four (4) carbons and eight (8) hydrogens. If we simplified or reduced the given ratio, we can have one (1) carbon and two (2) hydrogen (CH) which is now the so called empirical formula. The given formula for ethane became structural when you draw out the structure of a compound individually to indicate the bonding arrangement of an atoms in the molecule. 7. Which of the has greater atomic radius? Chlorine or aluminum? Why? Tip: Periodic Trends Answer: Aluminum Arrange the following elements with increasing ionization energy — Fe, Co, Ni, Cu, and Zn. Tip: Periodic Trends Answer: Fe, Co, Ni, Cu, Zn.