Chapter 4, Problem 13RQ

Figure 2.3 How many neutrons do (K) potassium-39 and potassium-40 have, respectively?

The pH of lemon juice is 2, and the pH of orange juice is 4. Which of these is more acidic, and by how much? What does this mean?

The following chemical reactants produce the ester ethyl ethanoate (C4H8O2): C2H6O + CH3COOH What type of reaction occurs to make ethyl ethanoate? condensation hydrolysis combustion acid-base reaction

What is the overall purpose of the light reactions in photosynthesis?

A molecule into which a radioisotope has been incorporated can be used as an ____________. a. compound c. salt b. tracer d. acid

What property of carbon makes it essential for organic life?

Why are drinking water supplies still a major concern for many countries?

Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po become after it emits an alpha particle?