Which electron configuration represents the electrons in an atom of sulfur in an excited state? (1) 2 – 8 – 6 (2) 2 – 7 – 7 (3) 2 – 8 – 7 (4) 2 – 7 – 8 Explanation: We must first look at the Periodic Table on the Reference Table, and find Sulfur. Sulfur's electron configuration is 2-8-6 according to the Reference Table. An excited state is a state in which an electron jumps to a higher energy level, while the ground state is the lowest energy most stable state for electrons.
Which compound is an electrolyte? (1) CH3CHO (2) CH3OCH3 (3) CH3COOH (4) CH3CH2CH3 Answer: Choice 3 CH3COOH is the correct answer choice Explanation: Electrolytes are compounds that can conduct electricity. Electrolytes are: Ionic compounds melted or dissolved in water (ionic means metal +nonmetal, metal +polyatomic ion, or two polyatomic ions together). Acids (The list of acids is on the Regent Reference table) Bases (The list of bases is on the Regent Reference table) All t
There is a simple and easy way to identify ionic versus compounds. Ionic compounds can be of three types: 1. Metal + Nonmetal To figure out whether an element is a metal or a nonmetal, look at the periodic table. Elements on the right of the staircase on the periodic table are metals. Elements to the left of the staircase on the periodic table are nonmetals. Hydrogen is a nonmetal even though it is located on the right side. Examples: KCl, BaS 2. Metal + Polyatomic ion Polya
A 0.050 M aqueous solution of which compound is the best conductor of electric current? (1) C3H7OH (2) C6H12O6 (3) MgSO4 (4) K2SO4 Answer and Explanation: First we need to go over what kind of compounds are the best conductors of electricity, or electrolytes. These are: metals, ionic compounds that are molten, ionic compounds that are dissolved in water, strong acids and strong bases. Let's now go over the compounds listed in answer choices: C3H7OH is a covalent compound (al
Reference table on Chemistry regent is your very best friend. It has the answer to probably around 80% of the questions asked. Today, we will go over understanding how to use table G and what kind of information it contains. Table G is titled as Solubility Curves at Standard Pressure. The x-axis title is Temperature and the y-axis is Solubility (g solute/100. g H2O). This chart shows us how much of each substance dissolves in 100g of water, emphasis on 100 grams, at different
Chemistry regent in approaching. This year, it will be administered on June 25, 2019 at 9 am. Format: The test consists of fifty multiple choice questions and thirty-five short response questions. Score conversion: There is a score conversion for every Chemistry Regent administered. For example for June 2012 test, a student got got 1 answer wrong would get 98, 10 answers wrong would be 86, and 36 answers wrong would pass with a 65. Test topics: Matter and its properties, atom
All students in public schools in New York state are required to take Regents. Chemistry regent is a three hour test that consists of 85 questions, 50 of which are multiple choice and the rest are short responses. Chemistry regent covers the topics of: Atomic Concepts, Periodic Table, Moles/Stoichiometry, Chemical Bonding, Physical Behavior of Matter, Kinetics/Equilibrium, Organic Chemistry, Oxidation-Reduction, Acids, Bases and Salts and Nuclear Chemistry. To review these t