yes
Yes , the volume of water will increase if salt is added , as salt is a solute and water is a solvent. When salt is added , it affects the weight of molecules and the liquid itself.
No. If the water doesn't overflow, then the addition of the fish will increase the total weight of the tank and its contents by 50 pounds.
To the best of my knowledge there is no chemical method of increasing the weight of a fish in water. I am intrigued as to why on earth any sane person would desire to do so.
Yes --assuming you don't hold your breath. A person will sink in water if he is not holding enough air in his lungs to keep him floating. Therefore, the person weighs more than the amount of water that he will displace.
The pH deccrease.
Oh yes.
Increase pH (water) = 7 pH (KOH solution) is about 8 - 10
The solution for this riddle is salt. When salt is dropped in water, its weight doubles due to water absorption. If you then add more salt, making it saturated, the weight will triple due to full saturation with water.
The movement of molecules increase when the temperature increase; some molecules at the water surface can escape as a gas.
The salt that will result in a temperature increase when added to water is calcium chloride (CaCl2). This is because it is an exothermic salt, meaning it releases heat when dissolved in water.
No, seltzer does not weigh more than water. Seltzer is simply water with added carbonation (carbon dioxide gas) which might make it feel heavier due to the bubbles, but it does not actually increase its weight.
The temperature increase a bit.