How can you demonstrate the law of conservation of mass?

The law of conservation of mass suggests that after a reaction, there is no change in the mass. It does not get bigger or smaller.

Using the chemical equation

For example, in the combustion reaction we have methane - CH4 and oxygen 02 which makes CO2 and H20

You need to balance this so you will end up getting

CH4 + 202 > CO2+2H20 (sorry I cant use the small formula numbers)

The mass of the products = mass of reactants which PROVES law conservation of mass :)

an ice cube will have the same mass as the water that forms as the cube melts.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: