Electrons are sent one at a time through a single slit. This slit is about the width of an atom. The slit can be adjusted to make it wider or narrower. Each electron is later detected using a screen that produces a spot of light wherever it is hit by a charged particle. If the slit is made narrower in an attempt to know exactly where each electron is when it passes through the slit, how does this affect the results?

In his forum, Dr. William Phillips stated that his belief in God was not scientific, although it was rational. Why did he say it wasn’t scientific?

The vertical columns on the periodic table are called families because they share similar chemical behavior. Why do they have the same behavior?

In an important experiment used to determine the nature of atoms, a gas like hydrogen, neon or mercury is excited by sparking it with electricity. The light emitted is separated out into individual colors using a prism or diffraction grating and a few lines of colored light are seen. The next three questions deal with your understanding of the mechanism behind these discrete spectra.    Jkasd, CC BY 3.0 , via Wikimedia Commons

The tires on your car get hot as you drive. In the next four questions, use your understanding of the molecular model of matter to explain the behavior of the air inside the tires.

As the tire is heated, what happens to the pressure inside?

The air in the tires is a mix of oxygen and nitrogen, 20% oxygen molecules and 80% nitrogen molecules. Oxygen has more mass than nitrogen. At any given temperature, how does the behavior of the two types of molecules compare?

In this chart, a periodic property is graphed for the first 35 elements on the periodic table. The first element of each row (Li, Na, and K) are indicated with squares and labeled on the graph. Identify patterns in the way this property changes along the first 3 rows.    Image Description Graph starts at 0 increases to about 1/2 for Li (the first element in row 2. Continues to increase for the next two elements, levels off, then drops to 0 for the final 4 elements of the row. Na (the first element in row 3) is at 1, increases for the next two elements, levels off, and drops to 0 for the last two elements. K (the first element in row 4) is at about 1. Increase for the next 8 elements, levels off, decreases for 6 elements, drops to 0 for the final element in the row Use the information in the chart to predict which of Rb, Pd, and Xe (atomic numbers of 37, 46, and 54) have the largest and smallest values of this property, then place them in order from smallest to largest. (smallest first, biggest last.)

  Dehydration is a worldwide problem. Even in the U.S., it has been suggested that nearly ¾ of the population live in a chronically dehydrated condition while being totally unaware of the problem. The effects of dehydration include a slowing down of the metabolism, increased fatigue, joint and back pain, loss of memory, as well as loss of mental focus. Imbibing 8 to 10 glasses of water daily, on the other hand, can mitigate joint pain, improve memory, and relieve some headaches. Drinking a glass of water when hunger pangs occur can even aid in dieting by silencing hunger pangs and speeding up metabolism. Researchers have discovered that taking in 5 or more glasses of water daily cuts the risk of colon cancer by almost 50% and the risk of breast cancer by about 80%.             Coke, on the other hand, is the preferred drink of millions of Americans. They are largely ignorant of the characteristics of this common beverage. Few, for instance, know that steak placed in a container of Coke will be dissolved in two days or less. Coke has been used to clean corrosion off the terminals of car batteries, to remove rust from chrome auto parts, and to remove grease from dirty clothing. Additionally, the citric acid in Coke makes it an ideal toilet bowl cleaner. Phosphoric acid in Coke is able to dissolve nails. In fact, those who consume the most Coke are at significantly greater chance of developing osteoporosis, a bone-wasting disease that makes bones brittle and easy to break. “Phosphoric acid in Coke is able to dissolve nails.“  The above statement is a statement of

  Dehydration is a worldwide problem. Even in the U.S., it has been suggested that nearly ¾ of the population live in a chronically dehydrated condition while being totally unaware of the problem. The effects of dehydration include a slowing down of the metabolism, increased fatigue, joint and back pain, loss of memory, as well as loss of mental focus. Imbibing 8 to 10 glasses of water daily, on the other hand, can mitigate joint pain, improve memory, and relieve some headaches. Drinking a glass of water when hunger pangs occur can even aid in dieting by silencing hunger pangs and speeding up metabolism. Researchers have discovered that taking in 5 or more glasses of water daily cuts the risk of colon cancer by almost 50% and the risk of breast cancer by about 80%.             Coke, on the other hand, is the preferred drink of millions of Americans. They are largely ignorant of the characteristics of this common beverage. Few, for instance, know that steak placed in a container of Coke will be dissolved in two days or less. Coke has been used to clean corrosion off the terminals of car batteries, to remove rust from chrome auto parts, and to remove grease from dirty clothing. Additionally, the citric acid in Coke makes it an ideal toilet bowl cleaner. Phosphoric acid in Coke is able to dissolve nails. In fact, those who consume the most Coke are at significantly greater chance of developing osteoporosis, a bone-wasting disease that makes bones brittle and easy to break. “They are largely ignorant of the characteristics of this common beverage. Few, for instance, know that steak placed in a container of Coke will be dissolved in two days or less.” What is the relationship between the two sentences above?