1. a chemical change is shown in the picture below. name three signs that you could use to tell it is a…

1. a chemical change is shown in the picture below. name three signs that you could use to tell it is a chemical change.\n2. look at the picture below. which of the two glasses, a or b, contains a dissolved mixture? describe the difference between the particles in the dissolved mixture and the contents from the other glass.

1. a chemical change is shown in the picture below. name three signs that you could use to tell it is a chemical change.\n2. look at the picture below. which of the two glasses, a or b, contains a dissolved mixture? describe the difference between the particles in the dissolved mixture and the contents from the other glass.

Answer

Brief Explanations:

  1. For the first question about chemical - change signs, common signs include color change, formation of a new substance, and production of gas. Rusting of a car shows color change (from metal color to brown - red rust) and formation of a new substance (iron oxide).
  2. For the second question, glass (a) contains a dissolved mixture as sugar is being added and dissolved in water. In a dissolved mixture (solution), the solute (sugar) particles are evenly dispersed at a molecular level among the solvent (water) particles. In the other glass (b, saturated solution), the maximum amount of solute has been dissolved and no more can dissolve under the given conditions, and there may be undissolved solute at the bottom or equilibrium between dissolved and undissolved solute.

Answer:

  1. Three signs of a chemical change: Color change, formation of a new substance, production of gas.
  2. Glass (a) contains a dissolved mixture. In the dissolved mixture (glass a), sugar particles are evenly dispersed at a molecular level in water. In glass (b) (saturated solution), the maximum amount of sugar is dissolved and there may be an equilibrium between dissolved and undissolved sugar or undissolved sugar at the bottom.