Score: ______ / ______
Chemistry Midterm Exam
Answer each question below. Make sure to show your work on any math problem.
1. Write the formula for mercury(II) chloride.
2. Arrange the following elements in order of decreasing atomic size: Li, C, K, F, Cs
3. Ammonia, NH3, is a typical ingredient in household cleaners. It is produced through a combination reaction involving N2(g) and H2(g). If 24.0 mol of H2(g) react with excess N2(g), how many moles of ammonia are produced? Show your work.
4. Name the following compound: KMnO4
5. Balance the following equation: KBrO3(s) KBr(s) + O2(g)
6. Write the formulas for silicon dioxide.
7. Complete and balance the following equation. Then write it as a net ionic equation. K3PO4(aq) + MgCl2(aq)
8. Explain how the atoms of one isotope differ from those of other isotopes of the same element.
9. The outermost energy level configurations for various theoretical elements are listed below. Match the questions below with the correct theoretical element.
____ 1. 3s1 A. Which has the highest electronegativity?
____ 2. 2s22p6 B. Which has the lowest first ionization energy?
____ 3. D = 2s22p5 C. Which is a noble gas?
10. Convert 4.3 kilograms to centigrams using dimensional analysis.
11. Consider the elements neon, bromine, and phosphorus. Which has five electrons in its 4p sublevel?
12. Write the formula obtained when this atoms loses or gains valence electrons and becomes an ion. Tell whether it is a cation or an anion. Be