hunting the elements part 1

Name: ____________________________Date_____________hchem Period______

NOVA VIDEO: “Hunting the Elements”

Answers can be found online at: http://video.pbs.org/video/2217713569/

PART 1: Basics of Chemistry

Gold - Au

1. Write the number of subatomic particles in a gold atom:

a. # of Protons:

b. # of Neutrons:

c. # of Electrons:

2. Give one property of gold.

3. How much gold is in one ton of the mined rock?

4. How much is each truckload of ore worth, once the gold is extracted?

5. What determines how reactive an element is?

6. What are the noble metals?.

7. Why is gold so heavy?

Copper - Cu

8. Write the number of subatomic particles in copper:

a. Protons:

b. Neutrons

c. Electrons:

9. List three uses of copper.

10. Give one property of copper.

Tin - Sn

11. What alloy does tin make when mixed with copper?

12. How are atoms arranged in pure metals?

13. Why isn’t pure copper used for bells instead of bronze?

Electron Microscope

14. How much would you have to zoom in on a map of the United States to replicate the power of an electron microscope?

15. Why is the microscope wrapped in acoustic blankets?

16. What part of the atom is actually visible under the microscope?

17. What do protons determine about an element?

18. What is the number of protons called? (The a_______ number)

19. Label the atomic number, symbol, and atomic mass of calcium below:

Chlorine - Cl

25. Give the number of atomic particles in chlorine:

a. Protons –

b. Neutrons –

c. Electrons –

26. Chlorine atoms tend to ( take / give away ) one electron, becoming an ( ion / isotope ).

27. Why do alkali metals and halogens react so strongly with other elements?

28. What do sodium and chlorine make when combined?

29. Compare the properties of each of the following:

Oxygen - O

30. What is ANFO?

31. What do each of the spikes on the ion chromatograph represent?

32. This is the chemical reaction of the ANFO explosion. Notice oxygen is NOT listed on the reactants side. Explain what happens during this reaction to release so much heat energy.

3NH₄NO₃ + 2CH₃NO₂ -------> 4N₂ + 2CO₂ + 9H₂O

33. Below is the chemical equation for the burning candle. What gas is needed to start this reaction (what gas in on the reactants side? _________________)

C₂₅H_{52 (solid)} + 38 O_{2 (gas)} → 25 CO_{2 (gas)} + 26 H₂O _(liquid)

34. The chemical equation for the formation of rust (iron reacting with oxygen) is:

4 Fe _(solid) + 3 O2 _(gas) => 2 Fe₂O_{3 (solid)}

What gas is on the reactants side? ______________________

35. Compare the speed and explosive force of gunpowder, emulsion-gel, and C4. Which is the

fastest explosion? WHY?