Activity+5

__**Activity #5: Post lab wrap up:

PART 1. For each of the following pairs, describe two ways that each is the same, and two ways that each is different. Then, tell me if you used a chemical or physical property to describe each similarity or difference. The first one is done for you.

a. copper and silver**__

SAME: They both tarnish and conduct electricity, used as money, both metal. DIFFERENT: mass, density and chemical makeup, color

CHEMICAL PROPERTIES LISTED ABOVE: mass, density, color, chemical makeup. PHYSICAL PROPERTIES LISTED ABOVE: Color, Height, Weight, Texture, Size, Density


 * __b. distilled water and salt water__**

SAME: liquid and transparent DIFFERENT:mass, texture, density

CHEMICAL PROPERTIES LISTED ABOVE: distill water is made of H and O, salt water has a lower boiling point PHYSICAL PROPERTIES LISTED ABOVE:salt water is more dense than distilled water


 * __c. table sugar and table salt__**

SAME:color, grainy, dissolves in water DIFFERENT:mass, chemical make up,

CHEMICAL PROPERTIES LISTED ABOVE:chemical make up, mass, color PHYSICAL PROPERTIES LISTED ABOVE:mass, size

__**PART 2. For the reaction methane + oxygen ⇒ carbon dioxide + water + energy answer the prompts and questions that follow.**__

List the reactants: methane and oxygen

List the products: carbon dioxide, water, and energy

What evidence is there that a chemical change has taken place above? the reactants were not in the product.