General Chemistry Questions & Answers

General Chemistry Questions & Answers - change in color - change in temperature - light is given off - gas is given off - precipitate - change in voltage - ANSWER: Chemical reactions - melting/boiling point - odor, color, taste - solubility - density - hardness/softness - volatility - ductility/malleability - viscosity - physical state - heat/electrical conductivity - ANSWER: Examples of physical properties 7 7 - ANSWER: Solutions with more H⁺ ions than OH⁻ ions = ___ Solutions with less H⁺ ions than OH⁻ ions = ___ 7 - acidic = 7 - neutral 7 - basic - ANSWER: pH scale values 1 cal = 4.184 J - ANSWER: The quantity of heat energy required to change the temperature of 1g of water by 1°C 1. A metal may lose 1 to 3 e⁻ to form a cation with the EC of previous noble gas (ionic) 2. A nonmetal may gain 1 to 3 e⁻ to form an anion with the EC of the next noble gas (ionic) 3. Atoms, usually 2 nonmetals, may share e⁻ with other atoms (molecular) - ANSWER: 3 octet rules 1. All matter is composed of atoms 2. All atoms of an element are identical but the atoms of one element differ from the atoms of any other element 3. Atoms of different elements combine with each other in certain whole-number proportions to form compounds 4. Atoms are rearranged to form new compounds; they are not created, destroyed, nor changed into atoms of any other element - ANSWER: Atomic theory (John Dalton) 1. Concentration of reactant/product when system shifts to the RIGHT = ↑ product, ↓ reactant when system shifts to the LEFT ↑ reactant, ↓ product if reactant is increased = shift RIGHT to produce more product if product is increased = shift LEFT away from reactant = decrease towards reactant = increase