A precipitation was formed after mixing two substance . is my question a chemical change or is not a chemical change?

If the same amount of cacl2 is added to equal volumes of water and maple syrup, which will have the higher temperature?

What is the theoretical yield of carbon dioxide? a)0.993 gb)2.98 gc)3.65 gd)8.93 g

Agas at 155 kpa and standard temperature has an initial volume of 1.00 l. the pressure of the gas rises to 500 kpa as the temperature also rises to 135°c. what is the new volume? 2.16 l 0.463 l 0.207 l 4.82 l