Question

Chemical change involving change in state color evolution of gas or change on temperature

Answer 1

The density of an object is its mass divided by its volume (d=m/v). A substance will have a higher density if it has more mass in a fixed amount of volume. For example, take a ball of metal, roughly the size of a baseball, compressed from raw metal. Compare this to a baseball made of paper. The baseball made of metal has a much greater weight to it in the same amount of volume. Therefore the baseball made out of metal has a much higher density. The density of an object will also determine whether it will sink or float in a particular chemical. Water for example has a density of 1g/cm3. Any substance with a density lower than that will float, while any substance with a density above that will sink.

Answer 2

in state

H2O(soild)__heat___>H2O (liquid)

evolution of gas

CO2 pass in lime water

change in heat

water + conc.HCl (inc in temp)