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- Created by: Ravi2002
- Created on: 10-04-18 20:21
1. Why are covalent bonds so strong
- strong inter-molecular forces
- strong forces of electrostatic attraction between positive nucleus and surrounding bonded negative electrons
- Has a closely packed regular lattice with strong forces of electrostatic attraction between oppositely charged ions
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Other questions in this quiz
2. Describe the process of gas chromatography?
- The sample is injected into long tube coated inside with the stationary phase, and the time taken for the sample to come out is measured
- The sample is pumped as gas in a chamber, where is detected by a data logger, which logs its retention time
- The sample is injected into long tube coated inside with the mobile phase, and the time taken for the sample to come out is measured
3. Equation for Rf Value
- solute distance / solvent distance
- solvent distance / solute distance
4. What is the mobile and stationary phase for GC
- mobile phase - unreactive gas (nitrogen). stationary phase - viscous liquid (oil)
- mobile phase - argon gas. stationary phase - sodium chloride
- mobile phase - solvent. stationary phase - silica gel
5. Describe metallic bonding
- strong electrostatic attraction between closely packed positive metal ions and the 'sea' of delocalised free electrons
- strong bonds between atoms that requires lots of energy to break
- strong electrostatic attraction between closely packed negative metal ions and the 'sea' of delocalised free electrons
- strong forces of electrostatic attraction between positive nucleus and surrounding bonded negative electrons
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