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Chemistry
12th
grade
Form 5 revision: Structure of atom (Form 4 chapter 2)
12 questions
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- 1. Fill in the Blank
What is the process occurs when iodine is heated?
- 2. Multiple Choice
The graph shows ____________________________.
supercooling curve
heating curve
cooling curve
- 3. Multiple Choice
This graph will occur when _______________.
the substance is not cooled evenly
the substance is hard
the substance has a low melting point than the room temperature
the substance has a high melting point
- 4. Multiple Choice
Which of the following is true?
Liquid particles absorb heat and turn into solid
Gas molecules contain more kinetic energy than liquid molecules
Solid has lower force of attraction between molecules than liquid
The process to turn liquid to gas is condensation
- 5. Multiple Choice
Rate of diffusion can be increased by ___________________
decreasing the temperature
increasing the temperature
having a lower molecular mass
having a higher molecular mass
- 6. Multiple Choice
Which of the following has the highest rate of diffusion?
ammonia
hydrogen chloride
methane
carbon dioxide
- 7. Multiple Choice
during the melting process, the substance exist in ________________.
solid
solid and liquid
liquid
liquid and gas
- 8. Multiple Choice
Which two substances have the same number of valence electrons?
Proton number of A: 8
Proton number of Z: 6
Proton number of D: 16
Proton number of X: 11
A and Z
Z and D
A and D
Z and X
- 9. Multiple Choice
The nucleon number of element A is 20. It contains 9 protons. What is the number of electron?
20
11
9
10
- 10. Multiple Choice
Who discovered proton?
J,J,Thompson
James Chadwick
Ernest Rutherford
Neils Bohr
- 11. Multiple Choice
Which isotope is used to detect the leaks in underground pipes?
carbon - 14
sodium - 24
cobalt - 60
uranium - 235
- 12. Multiple Choice
Isotopes have the same ___________________ .
chemical properties
proton number
nucleon number
number of electron
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