Classify the following as a physical or chemical change Change
Dry ice sublimates.
Mercury oxide decomposes into mercury and oxygen
Nail polish remover evaporates
Intermolecular forces are overcome between iodine molecules
Milk is heated to 40°C
Butter softens when heated
Sugar is ground to form icing sugar
Sugar caramelises during the making of fudge
Ice melts
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Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

What is the most important factor in determining climates.