Chemistry Mid-Term

1. Classify each of the following products as acid, base or neutral. a. Grapes, pH=4.0 ______________________ b. Orange Juice, pH=3.7 c. Shampoo, pH=10.0 d. Hair Remover, pH=12.0 e. Bread, pH=5.5 ______________________ ______________________ ______________________ ______________________

2. Label each of the following as a physical or chemical change. a. Grinding coffee beans in a grinder.__________ b. Burning a piece of paper. ____________ c. Water being boiled in a pan.________________ d. Water being frozen in the freezer.______________ e. Hydrogen peroxide decomposing into water and oxygen gas in the presence of light. _______ f. Rain droplets high in the atmosphere forming hail.__________ 3. Describe two ways of separating a mixture. Please be very detailed in your description. 4. Give names for the following elements: a. C__________________ b. O__________________ c. N__________________ d. H__________________ e. Al__________________ f. Ca_________________ g. Mg_________________

5. Explain what each number and letter means in the following notation: 3p6 3 means __________________ p means __________________ 6 means___________________ 6. Name the elements whose electron configurations are: a. 1s2 2s2 2p6 3s2 3p6 4s2 3d3________________ b. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d9 ________________ 7. Write electron configurations for these elements: a. Copper b. Bromine _______________________________ _______________________________

8. Write the symbol, atomic number and atomic mass for the atoms with the following characteristics: a. Contains 15 neutrons and 13 protons. ______________ b. Atomic number is 41. ______________ c. Contains 33 electrons and 42 neutrons. _______________ 9. Rank the following elements by increasing atomic radius: carbon, aluminum, oxygen, potassium.

10. Rank the following elements by increasing electronegativity: sulfur, oxygen, neon, aluminum.

11. What is the difference between electron affinity and ionization energy?

12. Why do elements in the same family generally have similar properties?

13. Naming Ionic CompoundsGive the name and molar mass of the following ionic compounds:

Name

Molar Mass

1) Na2CO3 ____________________________________________________ 2) NaOH _____________________________________________________ 3) MgBr2 _____________________________________________________ 4) KCl _______________________________________________________ 5) FeCl2 ______________________________________________________ 6) FeCl3 ______________________________________________________

Chemical Formula Writing Worksheet14. Write chemical formulas for the compounds in each box. The names are found by finding the intersection between the cations and anions. Example: The first box is the intersection between the zinc cation and the chloride anion, so you should write ZnCl2, as shown. zinc ZnCl2 iron (II) iron (III) gallium silver lead (IV)

chloride acetate nitrate oxide nitride sulfate 15. Mole Calculations: a. How many moles are in 15 grams of lithium?

b. How many grams are in 2.4 moles of sulfur?

c. How many moles are in 22 grams of argon?

d. How many grams are in 4.5 moles of sodium fluoride, NaF?

e. How many molecules are there in 122 grams of Cu(NO3)2?

f. How many grams are there in 1 x 1024 molecules of BCl3?