Portage Chemistry 103 Module 1 Exam Questions With All Correct Answers

calorimetry - ANSWER-study of how much heat is involved in temperature or physical change thermochemistry - ANSWER-study of how much heat is involved in chemical change exothermic - ANSWER-heat given off by (or extracted from) system as process takes place ex using cold pack on injury, burning natural gas endothermic - ANSWER-heat absorbed by (or added to) system as process takes place ex. melting ice Combustion, oxidizing, exploding, baking, cooking - ANSWER-5 types of chemical changes (heat/light, color change, gas, producing insoluble solid) Melting, freezing, boiling, condensation, dissolving - ANSWER-5 types of physical changes (easily reversible) Name of the material is on the periodic table - ANSWER-Question 1, element Names of 2 elements or parts of the names are in the scientific name of the substance - ANSWER-Question 2, compound Mixture appears to be one substance, layer, or color - ANSWER-Question 3, solution (homogeneous mixture) Mixture appears to be more than one substance, layer, or color - ANSWER-Question 4, heterogeneous mixture Accuracy - ANSWER-nearness of measured value to actual value Precision - ANSWER-the degree of agreement among several measurements of the same quantity Adding or subtracting significant figures - ANSWER-Round to number of decimal places as those with fewest decimal places (L to R) Multiplying or dividing significant figures - ANSWER-Round to number of significant figures as those with fewest significant figures (L to R) Method of unit conversion - ANSWER-new unit divided by old unit, 1 in front of larger unit, multiply by number to be converted