Question

Name: SCI 121 Quiz 1 (10pts) Please be sure to show all your work for full credit. Be careful about significant figures. 1. (2 pts) Choose which of the following is a physical or chemical property of the substance. a) The boiling point of liquid nitrogen is -196°C b) A tendency of ethanol to burn c) Iron rusts in an atmosphere of moist air d) Hydrogen sulfide gas smells like rotten eggs 2. (1.5 pts) How many significant figures does each of the following numbers have? a) 2008.670 b) 0.0013050 c) 2.590 x10+4 d) 400.00 3. (2 pts) Calculate (74.3-11.569) +0.0049 and place your answer in the space provided. 4. (2 pts) Convert 94.3 °F to K 5. (2 pts) Platinum has a density of 2.14 g/cm what is the mass of 4.5 cm of this metal?

Answer 1

a) Physical property 6) Chemical property c) Chemical property d) Physical property ع ع ع 2 3) (74.3 – 11569) = 0049 = 13000 4) K = (94.3 -32) *5 + 273.15 = 307.76 → K = 308. 5) Mass - volume x density - 4.5 cm3 X 2.14 m2 = 9.63g mass = 9.6g