Chem 111 Exam 1 Review Practice Exams (Questions & Answers) Rated 100% Correct!!

What is the wavelength in meters of green light with a frequency of 5.75 × 1014 s−1? (a) 5.22 × 10−7 m (b) 1.92 × 106 m (c) 1.92 × 108 m (d) 1.73 × 1023 m - Answer-(a) 5.22 × 10−7 m What is the energy of a photon having a wavelength of 900 nm? (a) 3.33 × 1014 J (b) 2.21 × 10−19 J (c) 1.79 × 10−31 J (d) 5.96 × 10−40 J - Answer-(b) 2.21 × 10−19 J Which light has the highest energy? (a) 700 nm, red light (b) 575 nm, yellow light (c) 475 nm, blue light (d) 400 nm, violet light - Answer-(d) 400 nm, violet light Convert 25.0 mL to liters. (a) 25,000 L (b) 0.250 L (c) 0.025 L (d) 0.00250 L - Answer-(c) 0.025 LConvert 5253 mg to kg. (a) 5.253 × 106 kg (b) 5.253 × 103 kg (c) 5.253 kg (d) 5.253 × 10−3 kg (e) 5.253 × 10−6 kg - Answer-(d) 5.253 × 10−3 kg Which of the following measurements represents a mass? (a) 100.0oC (b) 2.18 g (c) 25.0 mL (d) 186 cm - Answer-(b) 2.18 g Which of the following measurements represents a volume? (a) 250 mL (b) 7.12 g (c) 53.5oC (d) 186 mm - Answer-(a) 250 mL Which of the following has the largest density? (a) A 1-g object with a volume of 10 mL. (b) A 10-g object with a volume of 1 mL. (c) A 200-g object with a volume of 200 mL. (d) A 10-g object with a volume of 10 mL. (e) The densities of all the above objects are the same - Answer-(b) A 10-g object with a volume of 1 mL.What is the answer to this addition problem to the correct number of significant figures? 12.01 mL + 3.2 mL + 6 mL = (a) 21.21 mL (b) 21.2 mL (c) 21 mL (d) 20 mL - Answer-(c) 21 mL What is the answer to this division problem to the correct number of significant figures? "3.2416 g" /"2.15 mL" = (a) 15.077 g/mL (b) 1.5077 g/mL (c) 1.51 g/mL (d) 0.663 g/mL (e) 0.66325 g/mL - Answer-(c) 1.51 g/mL How many neutrons are in one atom of 79Br ? (a) 114 (b) 79 (c) 44 (d) 35 - Answer-(c) 44 How many electrons, protons, and neutrons are in one atom of 42Ca? (a) 42 e, 42 p, 42 n (b) 22 e, 22 p, 20 n (c) 22 e, 20 p, 22 n(d) 20 e, 20 p, 20 n (e) 20 e, 20p, 22 n - Answer-(e) 20 e, 20p, 22 n In what ways are isotopes of an element similar yet different? (12C and 13C would be examples of isotopes) (a) They have the same numbers of protons and neutrons. (b) They have the same numbers of protons and different numbers of neutrons. (c) They have the same number of neutrons, but different numbers of protons. (d) They have the same number of protons, but different numbers of electrons. - Answer-(b) They have the same numbers of protons and different numbers of neutrons. The charge on an electron is __________. (a) positive (b) negative (c) neutral - Answer-(b) negative