Questions From Past Papers Flashcards
(10 cards)
What is the test for pure water?
Boil the water and if it boils at 100° it is it is water
Explain how physical chromatography separates the dice in a food coloring
The dyes distribute differently between the stationary and the Mobile phase, so the guys move up the paper at different speed
Explain how the student could tell from the chromatogram that the food coloring contained more than one dye
There would be more than one dot in a vertical column
Explain how the student could use chromatography to identify unknown die in the food coloring
Run the unknown dies in the food coloring compare the RF value to known dies and substances so can I identify those that move the same distance as the known
Describe how crude oil is separated into fractions
Heat or vaporize the crude oil the column is cooler at the top and hotter at the bottom the vapor condenses into fractions, depending on boiling point of fractions
How can copper sulfate be used as a test for the presence of water?
Add water to the hydra copper sulfate color changing from white to blue
Do disadvantage of Phyo mining compared to traditional mining methods
Slower to produce copper and larger area of land required
Suggest how a catalyst will affect the equilibrium position
There will be no effect there would be an increase in the rate of the forward and the rate of the backward reaction by the same amount
Describe how cold was formed from the carbon dioxide present in the early atmosphere
Carbon dioxide was taken in my plants and used in photosynthesis by trees they die and then they are compressed over millions of years and the decomposers didn’t have the conditions to break them down
What can scientist predict using the shittier principle?
The effect of changing conditions in a position of an equal
