(1) (a) This is a physical change where the solid crystals of Iodine change unde

Question

(1)

(a)

This is a physical change where the solid crystals of Iodine change undergo sublimation to give purple vapors.

(b)

Heating cobalt chloride crystals is a chemical change because here the water of crystallization is removed by heating.

(2)

Add sulfuric acid to the two solutions, the one containing CaCl2 will form a precipitate because CaSO4 is insoluble in water.

(3)

The precipitate forms because the molecule is insoluble in water.

Consider the following reaction:

CaCl2 + H2SO4 ---> CaSO4(ppt) + 2HCl

Here the ppt formation takes place because CaSO4 is insoluble.

Hope this helps !

Explanation / Answer

INSTRUCTION: Give your answers to all questions in the space provided 1. Classify the following changes as physical or chemical: (2Pts.) a) b) lodine produces a purple vapor upon gentle heating CoCl2.6H20 (blue) turns into CoClz (pink) when heated overnight in an oven 2. You have a solution containing KCl or CaClz. What specific test(s) would you run to identify the compounds? (2 Pts.) Sometimes mixing two clear aqueous solutions results in a formation of a precipitate. What causes a precipitate to form? (2 Pts.) 3. If 15.0 mL of 0.10 M NaOH solution is required to titrate 10.0 mL of H2S04, what is the molarity of the acid. (Show your calculations) (3 Pts.) 4. 5 ow many moes of ron are present in 0150 sampl f e5o (2 Pts

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