Answer:
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. ... It is a weak acid, which can lose H+ ions in solution.
Chemical formula: C20H14O4
GHS precautionary statements: P201, P281
Explanation:
*internet*
That is false. mass is converted into energy
Explanation:
Let us assume that volumes is equal to spheres volume of nucleus.
fm = femto meter = 
pm = pico meter = 
Hence, calculate the volume as follows.
V = 
= 
= 82.4481 
(cubic femtometers)
or, = 82
Now, we will calculate the volume of the atom as follows.
V =
= 
= 1436758.4 
(cubic picometers)
thus, we can conclude that volume of the nucleus is 82 and volume of the atom is 1436758.4 .
Answer:
True
Explanation:
Yes.
The distance that the molecules move depends on their solubility in the solvent and the size of the molecules. Heavy molecules will travel slower and therefore travel a shorter distance in the time the chromatography is run.
We know from such things as felt tip pens that colourings can be soluble in different solvents. Water soluble felt pens have colours that are - well - water soluble. Permanent felt pens have colours that are insoluble in water but that are soluble in another solvent. This could well be alcohol.
The water soluble colours may also be soluble in alcohol. The solubility in alcohol will be different from the solubility in alcohol, and so the Rf value ( the distance travelled) will also be different.
Because of the complicated shapes of the colours, the colours may not have the same order in the Rf values in the different solvents.
