Midterm Review Day 2

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Unit 2 (Atomic Concepts) Review

Classwork

In the space below, set up a calculation to find the weighted atomic mass of Copper, Cu. Atomic Mass =

Base your answers to questions 18 and 19 on the information below.

Iron has been used for thousands of years. In the air, iron corrodes. One reaction for the corrosion of iron is represented by the equation below.

Equation 1: 4Fe(s) + 3O2(g) 2Fe2O3(s)

In the presence of water, iron corrodes more quickly. This corrosion is represented by the unbalanced equation below.

Equation 2: Fe(s) + O2(g) + H2O(l) Fe(OH)2(s) 15. Identify one substance in Equation 1 that can not be broken down by a chemical change. [1]

______________________________________________________________________________ 16. Balance the equation in the space below, using the smallest whole-number coefficients. [1] __________Fe(s) + __________O2(g) _________Fe2O3(s)

17. Explain, in terms of electrons, the type of bonding in the molecule Fe2O3

18. Explain, in terms of types of elements (metal or nonmetal), the type of bonding in the molecule Fe2O3

19. A sample of which of the following substances has covalent bonds?(note – there are two correct answers.) (1) NaCl (3) Ag(2) C (4) Li(OH)