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The ice-to-water ratio of hard ice is 1:0, meaning there is no water present in hard ice as it is solely composed of frozen water molecules.
Nope. In many books they are described as 'hard as ice' or 'ice cold' but not actually ice.
Ice.
Yes, the ice on Pluto is likely harder than the rock on Earth. This is because the ice on Pluto is made up of compounds like water ice and nitrogen ice which are generally harder compared to most types of rocks found on Earth.
Crushed ice melts faster than ice cubes because crushed ice has a greater surface area exposed to the surrounding temperature, allowing for quicker heat transfer. This increased surface area results in faster melting compared to larger ice cubes with less surface area exposed.
Reversible reactions are those where the products are in equilibrium at a set of conditions. For one of the most simple examples to illustrate this, look at ice water. At equilibrium conditions, a class of ice water is half ice and half water. If you shift the conditions by heating the ice water, ice will melt to bring the temperature back to equilibrium conditions but the ratio of ice to water will have changed.