SCH3USome Ch 1 and 2 Review Questions 1.How many significant figures should be quoted in the product (4.6 cm x 12.62 cm)? (a) 5(b) 2(c) 3(d) 4 2.With significant figures in mind, what is the sum of the following; 27.23 g, 30 g, 108.1 g, 7.512 g? 3.When lighting a bunsen burner, which of the labeled parts in the diagram above may be openedWELL BEFORE the match is struck? 4.You have examined a material. Which one of the following factors suggests that the substance is amixture? 5.Which of the following diagrams best illustrates the temperature versus time graph for the heating ofice at -10°C to produce steam at 125°C? (a) (b) (c) (d) 6.Suspensions exhibit 7.Collidal dispersions exhibit 8.If atom Acontains 18 protons and 22 neutrons, while atom Bcontains 20 protons and 20 neutrons,then atoms Aand Bare 9.The number of protons in the atom whose atomic mass is 89 and atomic number is 39, is (a) 39 (b) 50 (c) 51 (d) 89 (e) 128
10.The number of neutrons in an atom of the radioactive carbon isotope 146C, is 11.What is the mass number of an isotope of hydrogen consisting of 1 proton, 1 electron, and 2 neutrons?
- Summer '19
- Atom, Electrons