1.Which of the following demonstrate s a chemical reaction? a. Boiling water
b. Lighting incense sticks
c. Melting ice cubes
d. Subliming mothballs

2.which following is a chemical reaction
a. salt dissolved in water
b. Food spoilage
c. crystallization of fish sauce
d. Melting ice cream

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?

Which statement best describes the function of enzymes?