A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions .
It is a homogeneous mixture since the components of tap water are blended so that it looks like a single substance, since you only see water and nothing else.
(Heterogenous mixtures are mixtures in which the separate components that make up the substance are visible .)
1. A mixture is a material made up of two or more different substances which are physically combined.A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspension and colloids.
2. Tap water is a homogeneous mixture, not heterogeneous. This is because tap water has dissolved minerals inside it, but they are equally distributed throughout the water.
3. 70% rubbing alcohol means that 70% of the molecules in the rubbing alcohol is actually alcohol. The other 30% is water. As I have stated at the start the answer, although alcohol is technically pure, rubbing alcohol is not purely made of alcohol.
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Use ideal gas law PV=nRT at STP, pressure is 1atm and temperature is 273K (0 Celsius) 1×1.5L=n × 0.0821 × 273 n is moles and R is ideal gas law constant, always 0.0821 moles= 14.9422(6.02×10^23 molecules)=9.0×10^24 molecules
