ISBS #1- 12 p.50

1) A physical property is a property that can be observed and measured without changing the chemical makeup of the substance.

2) Three physical properties of water are freezing point, density, and it's ability to dissolve solutes as a solvent.

3) The density of solid water compares to the density of liquid water because it's the only solid that is less dense compared to its liquid form. This is why ice floats in water.

4) A setting where I might observe water as a solid , a liquid and a gas all at the same time is when I'm in the snow and there is a flowing river with water vapor in the air.

5) Heterogeneous and homogeneous mixtures are different because heterogeneous means different, which means the composition of the mixture is not the same, and homogeneous is the same or uniform throughout the mixture. All solutions are homogenous mixtures.

6) When gasoline and water and poured into the same container they form two distinct layers. The gasoline would form a layer on top because it is less dense than the water.

7) a) a medicine accompanied by instructions to "shake before using" is a suspension
    b) Italian salad dressing could be classified as suspension
    c) mayonnaise is a colloid
    d) a cola soft drink is a solution
    e) an oil - based paint is a suspension
    f) milk could be classified as a colloid

8) When you notice beams of light passing into a darkened room through the blinds on a window it is demonstrating that the air in the room is a colloid. This is known as the Tyndall effect because the light is scattered though the blinds.

9) See photos below of solutions and a suspension
solution
 solution

 suspension





10) Suppose you have a clear, red liquid mixture, and a beam of light is observed as it passes through the mixture. Over a period of time, no particles settle to the bottom of the container. The mixture would be classified as a solution because the beam of light is able to completely pass through. A solution is a homogenous mixture in which a solute is dissolved in a solvent, so no beams of light would be retracted.

11) The term substance is a material with a uniform, definite composition and distinct properties. Two examples of substance are table salt and sugar.

12) a) CO compound
      b) Co element
      c) HCl compound
      d) Mg element
      e) NaHCO3 compound
      f) NO compound
      g) I2 element