The chimicals in some liquids burn others do not.
Because some liquids have less kinetic energy.
Some are, such as acetic acid. Other such as hydrocyanic acid are gases while others, such as citric acid are solids..
Some, yes, and others, no.
They don't. Some liquids expand when they become solid and others shrink, while some do maintain the same volume.
On some liquids it will float, on others it will not.
Some examples of liquids that burn at very low temperatures include alcohol (such as ethanol and methanol), acetone, and gasoline. These liquids have relatively low flashpoints, making them highly flammable and able to ignite at low temperatures.
water
It depends which elements you are talking about. Some would exist as solids at this temperature while others would be gases or liquids.
no some of them are misible while some not
On the copper surface, as a result of reactions with oxygen, carbon dioxide and water from atmosphere, copper carbonate (CuCO3) is formed; of course this compound is not soluble in all liquids, it is impossible. Copper carbonate can be removed with dilute acetic acid (vinegar), but not with water.
There is no wood that does not burn. All types of wood are combustible and can burn if exposed to high enough temperatures. Some woods may burn more slowly or with less intensity than others, but they are all capable of burning.
Some liquids are denser than others. In general, everyday experience, most liquids are denser than gases, but not as dense as solids. There are some exceptions to this rule.