Answer:
which of these elements has the chesmistry
it is water because it is dissolving the sodium chloride
Answer:
B, adding an indicator to a solution to test its acidity
Explanation:
Answer:
Correct combinations are
For option A it is 2
For option B it is 4
For option D it is 3
For option C it is 1
Explanation:
For checking the spontaneity of a reaction, we have to check the sign of ΔG using the below formula
<h3>ΔG = ΔH - T×ΔS</h3>
where
ΔG is the change in Gibbs free energy
ΔH is the change in enthalpy
T is the temperature
ΔS is the change in entropy
<h3>For spontaneous reactions, ΔG must be less than zero and for non-spontaneous reactions ΔG must be greater than zero but for an equilibrium reaction ΔG must be equal to zero</h3>
So in case of 1 as ΔH and ΔS are positive if the temperature is above a certain value then ΔG will be less than zero
So in case of 2 as ΔH is negative and ΔS is positive then ΔG will always be less than zero at all temperatures
So in case of 3 as ΔH and ΔS are negative if the temperature is below a certain value then ΔG will be less than zero
So in case of 4 as ΔH is positive and ΔS is negative then ΔG will always be greater than zero but in reverse direction as ΔG is less than zero therefore in reverse direction the reaction will be spontaneous at all temperatures
Answer:
The Retention factor (rf) value is = 0.2
Explanation:
- Retention factor (Rf) is factor used substances that could be separated using Chromatography. Retention factor determines how fast the component can move on the chromatogram (stationary phase) after elution. Elution occurs when mobile phase (solvent) moves across the stationary phase when the solute has been spotted on the origin.
- Retention factor (Rf) ranges from value between 0 and 1. The closer the value to 1, the faster it can move upon elution. Rf can be calculated.
- Rf value = distance moved by the solute / distance moved by the solvent
= 0.40cm / 2.00cm
= 0.2