Answer:
Mixing them with water and acetone
Step-by-step explanation:
Hi, the first step is mix a bit of each other with water:
- The salt and the sugar will disolve and leave a clean water
- The flour will also disolve but the resulting water will be a little cloudy
- The baking soda will release CO2 and the bubbles cna be seen.
So far you have identify the flour and the baking soda. Now, the sugar is an organic compound soluble in organic solvents like acetone, but the salt isn't much soluble in non polar solvents like this one.
Mixing a bit of this two substances in acetone will tell you that:
- The one that disolves is the sugar
- The one that doesn't disolve is the salt.