Salt water , from the ocean
Answer:
C
Explanation:
an index fossil is a fossil from a very short-lived, geographically widespread species known to exist during a specific interval of geological time.
5. It was evident that the marker ink is a mixture because when it was subjected to chromatography process the constituent materials which made up the marker ink got separated and appear as different bands on the chromatography paper.
6. YES, the constituents of the marker have different travelling speed, so some travel slowly while others are fast. Their travelling rates depend on the mobile phases that are used during the chromatography process.
The constituents of the marker has different travelling speed because each one of them react differently with the mobile solvent that is used. Those constituents that have high affinity for the solvent used will travel faster that those that did not.
7. The mixture travel faster in alcohol that in water. This is because the ink dissolves more in the rubbing alcohol and has higher affinity for rubbing alcohol compare with water.
8. I can improve on my RF measurement by making sure that I read to the millimeter marks when taking my readings with ruler and by making sure that I record my value to four significant figures.
Answer:
red
Explanation:
Benedict's solution -
It is the chemical composition of copper(II) sulfate pentahydrate , sodium citrate and sodium carbonate .
The solution of Benedict is used to test sugars , like glucose.
The color of Benedict's solution is blue.
And the reaction with various sugars changes the color of the solution.
The color change is usually from blue to yellow , green , brick red , depending on the concentration of the sugar.
- In case of low concentration of glucose , the color change is from blue to green / yellow.
And ,
- In case of high concentration of glucose , the color change is from blue to red.
