Exam 2: The Chemical Basis of Life

Consider the following situations: (1)a magnesium atom and two chlorine atoms join together to form a molecule of magnesium chloride; (2)water molecules interact with each other in a beaker; and (3)two carbon atom and six hydrogen atoms join together to form ethane. Rank the strength of the bonding interactions taking place in each situation, from the weakest bonds to the strongest bonds.

You've made a hot drink by dissolving a teaspoon of instant coffee and a teaspoon of sugar in a cup of hot water. Which of the following statements is true?

The four most common elements in living organisms are

What happens to an atom if the electrons in the outer shell are altered?

The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds, whereas neighboring water molecules are held together by ________ bonds.

Below is the structure of leucine, an amino acid. What type of bond is the arrow pointing to?

In plants, the process of photosynthesis produces glucose (C₆H₁₂O₆)and oxygen from carbon dioxide and water. Which of the following statements about photosynthesis is true?

As ice melts,

After reading the paragraph below, answer the questions that follow. Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. The vast majority of uranium found on Earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235. -If the atomic mass of uranium is 92, how many neutrons does an atom of uranium-235 have in its nucleus?

Water's surface tension and heat storage capacity are accounted for by its

If you found a fossilized dinosaur bone, what could be done to determine the age of the fossil?

When full, the innermost electron shell of argon contains ________ electrons, and the outermost shell contains ________ electrons.

Which of the following statements about water is false?

The body uses atoms in different ways to accomplish different tasks. For example, one portion of the body's calcium supply strengthens bones, whereas another portion combines with proteins to stimulate blood clotting after tissue injury. Which of the following statements provides the most logical chemical explanation of calcium's ability to perform such different functions?

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?

You want to design a controlled experiment to determine which tablet, PEPCID AC or Alka-Seltzer, neutralizes stomach acid the quickest. Which of the following experiments would be the best to perform?

A solution with a pH of 7 is

After reading the paragraph below, answer the questions that follow. Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. The vast majority of uranium found on Earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235. -In a certain type of nuclear reactor, uranium-238 can be converted to plutonium-239, another radioactive element (with an atomic number of 94)that can be used to power nuclear reactions. Which of the following statements regarding uranium-238 and plutonium-239 is false?

What change is occurring in this figure?

Which of the following statements about radioactive isotopes is true?