CHEM 1110 Midterm: Chemistry 1110 2007 Spring Test 1
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You have 75 minutes to complete this 100 point test. Please mark each answer clearly and show all work. No gaphing calculators: (10 pts) multiple choice: circle the best answer, in chemistry, the numbers in front of formulas in a balanced equation are referred to as: Ii. (30 pts) calculations and explanations: clearly show all work for full credit. Isotopic mass: (8 pts) an element has three naturally occurring isotopes with the following masses and percent abundances. (a) calculate the average atomic weight of this element and (b) give the chemical name of the element. (u) Element name:_________________________: (8 pts) acetic acid is an ingredient in vinegar. Pure acetic acid has a strong vinegar smell but is corrosive to the skin. What is this speed in m/s? (1 mi = 1. 609 km: (6 pts) explain the difference between precision and accuracy as it applies to chemical measurements.
