ATP
1. Metal carbonates tend to be highly reactive with acids.
2. The mobile phase in chromatography is a type of substance. It refers to the type
of substance that the molecules can move in (which is either a liquid or gas).
Here, it would be the solvent. Stationary phase in chromatography is where the
molecules can't move in (which is probably a solid) Here, it is the paper.
3. Flame tests should use non-luminous flame, that is when the air hole is open. A
yellow flame is produced due to incomplete combustion when the air hole is
closed.
4. Density of air is 28.97, approximately 29. This information can be used to
deduce which gases should be collected using the downward displacement
method and the upward displacement method. Make sure to remember that
some gases are diatomic.
5. More denser liquids/gases tend to be at the bottom.
6. Nitrogen dioxide is an acidic reddish-brown gas.
7. Effect of Nitrogen on a lighted splint - Extinguishes the flame.
8. FeSO4+NH3 (or any metal + ammonia) gives Fe (OH)2 (metal hydroxide).
9. Hot water baths cannot exceed 100 degree celsius, because of course, the
water will evaporate.
10. Stoppers should be used above the fractionating column in fractional
distillation so that the vapours don't escape (when in a water bath), as the
temperature doesn’t have to be recorded.
11. Lead is a silver/grey solid.
12. Universal indicator for titration shows too many colour changes (cannot figure
out the end-point) and so it isn't used.
13. Titration(when to stop repeating) - at least two results(volume) are within 0.2
cm3 or less.
14. Melting point decreases for an impure substance.
15. Boiling point increases for an impure substance.
16. To collect gases during electrolysis, usually a test tube is placed upside down
above the electrode (the test tube is partially filled with the electrolyte due to
the way it is placed)
17. Fe2+ is a reducing agent, Fe3+ is an oxidising agent.
1. Metal carbonates tend to be highly reactive with acids.
2. The mobile phase in chromatography is a type of substance. It refers to the type
of substance that the molecules can move in (which is either a liquid or gas).
Here, it would be the solvent. Stationary phase in chromatography is where the
molecules can't move in (which is probably a solid) Here, it is the paper.
3. Flame tests should use non-luminous flame, that is when the air hole is open. A
yellow flame is produced due to incomplete combustion when the air hole is
closed.
4. Density of air is 28.97, approximately 29. This information can be used to
deduce which gases should be collected using the downward displacement
method and the upward displacement method. Make sure to remember that
some gases are diatomic.
5. More denser liquids/gases tend to be at the bottom.
6. Nitrogen dioxide is an acidic reddish-brown gas.
7. Effect of Nitrogen on a lighted splint - Extinguishes the flame.
8. FeSO4+NH3 (or any metal + ammonia) gives Fe (OH)2 (metal hydroxide).
9. Hot water baths cannot exceed 100 degree celsius, because of course, the
water will evaporate.
10. Stoppers should be used above the fractionating column in fractional
distillation so that the vapours don't escape (when in a water bath), as the
temperature doesn’t have to be recorded.
11. Lead is a silver/grey solid.
12. Universal indicator for titration shows too many colour changes (cannot figure
out the end-point) and so it isn't used.
13. Titration(when to stop repeating) - at least two results(volume) are within 0.2
cm3 or less.
14. Melting point decreases for an impure substance.
15. Boiling point increases for an impure substance.
16. To collect gases during electrolysis, usually a test tube is placed upside down
above the electrode (the test tube is partially filled with the electrolyte due to
the way it is placed)
17. Fe2+ is a reducing agent, Fe3+ is an oxidising agent.
