Ahmad pours 2 tablespoons of vinegar into a cup that contains 250 grams of milk. He watches the mixture change as the milk separates into curds and whey. After the reaction takes place, Ahmad records the mass of the product as 280 grams.

false

explanation:

boats, things on boats luggage are way more heavy then water.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.