(80 points) (7 questions)

1.) how did lavoisier transform the field of chemistry in the late 1700's? *transform means to change so think about how chemistry was different before lavoisier's work and after lavoisier's work*

2.) use an example from your own experience to explain how collaboration can be valuable to the successful outcome of a project. *the key to this question is the explanation and experience*

3.) the density of osmium, which is the densest metal, is 22.57g/cm . what is the mass of a block of osmium that measures 1.00cm x 4.00cm x 2.50cm?

4.) why is the metric system the preferred system of measurement for science?

5.) explain the difference between mass and weight. provide an example to illustrate the distinction.

6.) a student must determine the density of an irregularly shaped metal object. which combination of equipment and method would provide the best quantitive observations?

a- find the mass with a balance, find the volume by linear measure, and then calculate the density.

b- find the mass with a balance, find the volume by linear measure, and then calculate the average density of several trials.

c- find the mass with a balance, find the volume by water displacement, and then calculate the density

d- find the mass with a balance, find the volume by water displacement, and then calculate the average density of several trials.

7.) scientists have found geysers on one of saturn's moons. the geysers release water vapor containing complex organic compounds, which may indicate the presence of life.

which of the following elements is most likely abundant in the organic compunds in the water vapor?

a- carbon

b- chlorine

c- iron

d- zinc