The sun is located in the center of our solar system. Where is the sun located in our disc-shaped galaxy?

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The sun is about 1/3 the distance from the center of the Milky Way galaxy to its outer edges. It's located in a smaller spiral arm, between two large arms, called the Orion Arm.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.