This enclosed container has a shirt with a vapor surrounding it. 15. Which type of vapor was first used in the Song dynasty to prevent other people from becoming sick? A. poison B. smoke C. steam D. bleach

48. What charge would an oxygen atom with 10 electrons have?

2. Give three examples of synthetic products made from plants or animals.

Which of the following is an isomer of $H-\underset {H}{H}-C\equiv C-\underset {H}{H}-\underset {H}{H}-H$ 2-pentene 1-pentyne pentane

2) What charges would Aluminum, chlorine and calcium ions have?

45) Explain the differences between an ionic bond and a covalent bond. 46) What is the difference between a polar covalent and nonpolar covalent bond? 47) How can you determine whether a bond is ionic or covalent? 48) Classify these bonds as ionic bonds or covalent bonds: a. Br-br b. N-O c. K-Br d. $Mg-S$ 49) Explain the main characteristic of a metallic bond.

Explain why ionization energy decreases as you move down a group. Atomic radius decreases Electrons are added to the same energy level Nuclear charge decreases Outer electrons are farther from the nucleus and more shielded

Name or give formulas for the following compounds. a) $Na_{2}SO_{4}$ __ b) Strontium Oxide __ c) AuCl __ d) Iron (II) Chromate __ e) Carbon Tetrachloride __ f) $C_{2}O_{7}$ __ g) $Cu(NO_{3})_{2}$ __ h) $(NH_{4})_{2}CO_{3}$ __

The strength of the dipole-dipole interactions __ with the number of electrons in a molecule. a Increases b Decreases C Remains constant d First increases and then decreases

Changing from one element to another is called transmutation isotopic change radioactivity

d. What volume of 5:00 M Kl stock solution is needed to make 250. mL of a 1.50 M solution? 833 mL 0.030 oml 33.3 mL 75.0 mL