Chemical Physical Changes 2P
     The Answers

Fill in the Blanks

1. new substances
2. limewater      milky white
3. oxygen gas
4. 18
5. lose
6. dysprosium
7. 6
8. magnesium      chlorine
9. ability of a fluid to flow
10. into the third shell (Note: you probably wouldn't know this)
11. 6
12. fuming amber gas produced, colourless nitric acid becomes deep green in colour
13. 3

Chart

• carbon has 6 protons 6 neutrons 6 electrons, 2 shells and 4 valence (outer shell) electrons.
• oxygen has 8 protons 8 neutrons 8 electrons, 2 shells and 6 valence (outer shell) electrons.
• magnesium has 12 protons 12 neutrons 12 electrons, 3 shells and 2 valence (outer shell) electrons.
• calcium has 20 protons 20 neutrons 20 electrons, 4 shells and 4 valence (outer shell) electrons.
• This atom is phosohorus. 15 protons 16 neutrons 15 electrons,
• This is a lithium ion with one less electron than a neutral atom. It has two shells with a missing valence electron.

Match the columns

1. E
2. C
3. G
4. K
5. A
6. J
7. B
8. I
9. F
10. D
11. H

True or False

1. T
2. F
3. F
4. T
5. F
6. F
7. T
8. F
9. F
10. F