advertisement

Measurements and Calculations 是非題 ( ) nm= 10-3 m ( ) A number that is greater than 1 will always have a positive exponent when written in scientific notation. ( ) Specific gravity has no units. ( ) Exact numbers can be assumed to have an unlimited number of significant figures. (1) (2) (3) (4) 1 2 3 4 5 ○ × ○ ○ 6 7 8 9 10 11 12 13 14 15 16 選擇題 (1) ( ) 10-3 (A) c (B) d (C) k (D) m (2) ( ) 109 (A) G (B) M (C) P (D) T 12 (3) ( ) 10 (A) G (B) M (C) P (D) T (4) ( ) 1 nm = (A) 10-3 (B) 10-6 (C) 10-9 (D) 10-12 m (5) ( ) Which is correct? (A) 100 oF = 32 oC (B) -40 oF = -40 oC (C) 77 K = -186 oC (D) 70 oC = 333 K (6) ( ) (7) ( ) There are 5280 feet in 1 mile. Indicate the number of significant figures implied in the above statements. (A) 1 (B) 2 (C) 3 (D) infinite (9.7871)( 2) (0.00182)( 43.21) How many significant digits should the answer to the calculation be expressed? (A) 1 (B) 3 (C) 4 (D) 5 (8) ( ) 1.492×102 + 3.40×10-2 + 2.00034×103 How many significant digits should the answer have? (A) 3 (B) 4 (C) 5 (D) 6 (9) ( ) (10) ( ) (67.41 + 0.32 + 1.98)/(18.225) How many significant digits should the answer have? (A) 3 (B) 4 (C) 5 (D) 6 Iron has a density of 7.87 g/cm3. If 52.4 g of iron is added to 75.0 mL of water in a graduated cylinder, to what volume reading will the water level rise? (A) 78.4 (B) 79.5 (C) 80.6 (D) 81.7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 D A D C B D A C B D 問答或計算題 (1) (2) Give the answer for each calculation to the correct number of significant figures. a. 12.6 x 0.53 b. (12.6 x 0.53) – 4.59 Perform the indicated temperature conversions. a. 275 K to oC b. 82 oF to oC (1) a. 6.7 b. 2.1 (2) a. 2 oC b. 28 oC