Exam 3: Elements of Chemistry

Read carefully. Twice as much as one million trillion is two million trillion. One thousand times as much is 1000 million trillion. One million times as much is 1,000,000 million trillion, which is the same as one trillion trillion. Thus, one trillion trillion is a million times greater than a million trillion. Got that? So how many more water molecules than impurity molecules are there in a glass of water that is 99.9999 percent pure?

The Colorado River water in Colorado has a salinity of about . By the time this water passes into Mexico its salinity has increased to about . How many milligrams of salts have been added to each liter of water?

How would you classify the following material? coffee (black)

Which of the following elements are in the same period as magnesium (Mg)?

Elements that are in the same ________ have a tendency to have very similar chemical properties due to periodic trends.

The following image describes what type of change?

How would you classify the following material? a cappuccino (with foam)

A sample of water that is 99.9999 percent pure contains 0.0001 percent impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × ) molecules. If 0.0001 percent of these molecules were the molecules of some impurity, about how many impurity molecules would this be?

Nanotechnology may play an important role in the development of ________.

Which of the following statements best describes an element?

Which of the following elements are in the same group as silicon (Si)?

Which of the following elements is a transition metal?

Which of these is not a metal?

What happens to the properties of elements across any period of the periodic table?

Which of the following images could describe an element at the atomic level?

What do chicken noodle soup and garden soil have in common?