TEST 2: CHEMISTRY AND ELECTRICITY
Multiple Choice (_______/12 marks)
1. Cation is........
a) Metal which has gained an electron
b) metal which has lost an electron
c) non-metal which has gained an electron.
d) Non-metal which has lost an electron.
2. Anion is.....
a) Metal which has gained an electron
b) metal which has lost an electron
c) non-metal which has gained an electron.
d) Non-metal which has lost an electron.
3. True or False: Molecular compounds have a metal and a non-metal that share electrons
a) True
b) False
4. True or False: Hydrogen is an exception to the rule. It is actually a non-metal.
a) True
b) False
5. How many connections can oxygen form with another non-metal
a) 1
b) 2
c) 3
d) 4
6. How many electrons does Phosphorus Ion have in its outer shell when it forms an ionic bond.
a) 2
b) 3
c) 5
d) 8
7. When we refer to static electricity, which of the particles transfer between objects?
a) Atoms
b) electrons
c) protons
d) neutrons
8. Charging an object by induction refers to which of the following ... .
a) transferring electrons by rubbing one object against another to develop electrical charge
b) transferring electrons by physical contact with another object
c) Transferring electrons without phisical contact (jumping through air)
d) none of the above
9. When you rub glass rod against cotton, which of the following is true?
a) Glass becomes positive, and cotton becomes negative.
b) Glass becomes negative and cotton becomes positive
c) Glass becomes positive and cotton becomes positive
d) Glass becomes negative and cotton becomes negative
10. When an object looses electrons it becomes......
a) positively charged
b) neutral
c) negatively charged
d) all of the above
11. When a neutral object is touched by a negatively charged object, the neutral object gains...
a) electrons and becomes positively charged
b) electrons and becomes negatively charged
c) protons and becomes positively charged
d) protons and becomes negatively charged
12. The following symbol represents which of the following....
a)
b)
c)
d)
Switch
Light Bulb
Voltmeter
Resistor
Short Answer
1. Draw how the following IONIC compounds form (_______/9 marks)
a) Magnesium Oxide
b) Sodium Phosphide
c) Lithium Chloride
2. Draw the structure of following MOLECULAR (COVALENT) Compounds
( 6 Marks)
a) O2
b) CH4
c) H2O
3. Count the atoms in the following compounds (_______ /12 marks)
a) Na2SO4
TYPE OF ATOM
NUMBER
TOTAL
b) 3 Mg(OH)2
TYPE OF ATOM
NUMBER
TOTAL
c) AlNO3
TYPE OF ATOM
TOTAL
NUMBER
4. Explain the following phenomenon: You touch the Van De Graaff Generator (the big
sphere that makes your hair stand up). Your friend touches your hand and gets a zap.
Explain what happens (you can either words words, diagrams or both).
Consider the following:
i) What type of charge did your hand receive (friction, conduction,
induction)?
ii) How did the charge transfer to your friend to result in a zap (is
your body a conductor or insulator). Explain why?
5. Draw diagrams for each of the following steps (Make sure to show the charges) .
(____/9 marks)
a) You rub a plastic comb against wool and you comb. (2 marks)
b) You bring the charged comb close to a neutrally charged pith ball. (3 marks)
c) Neutrally charged pith ball touches the comb. ( 3 marks)
d) You now bring a negatively charged object to the pith ball (only show what the pith ball
does) (1 mark)
Label the following parts of a circuit diagram : (_________/4 Marks)