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Bio Chapter 2
Terms in this set (20)
In a covalent bond, electrons are __________. In an ionic bond, electrons are __________. Which is the stronger type of bond?
shared; transferred; covalent
What is radon?
A radioactive gas from the decay of uranium that can cause lung cancer
An atom's mass number equals which of the following?
number of protons + number of neutrons
What information is provided by a molecule's structural formula that is not provided by its molecular formula?
number of covalent bonds and whether they are single, double, or triple
Which of the following is a characteristic of Carbon-14, but not of Carbon-12 or Carbon-13?
Of what substance are coral reefs mainly composed?
calcium carbonate skeletons of coral animals
Sodium chloride (NaCl, table salt) is a compound but not a molecule. Why?
It does not contain covalent bonds.
Which of the following are the reactants in the chemical reaction that results in 2 molecules of water (2H2O)?
2 molecules of hydrogen gas and 1 molecule of oxygen gas
Scientists have found several lines of evidence pointing to the existence of water on Mars. Which of the following have they observed?
ice caps at both poles and soil samples containing water
Hydrogen and helium are the only elements in the first row of the periodic table. What characteristic(s) do they share that determine(s) their position?
They have only one electron shell.
Which of the following is a disease caused by an excess of a trace element and what is the element?
In Sweden (a cold country) one year, there was sunshine from July 1 to July 10, followed by several days of very cold, rainy weather. If you wanted to stay warm that year during your late-July camping trip, where was the best place to pitch your tent? Why?
Near the coast: Water stores heat from the sun and releases it gradually.
What happens when water is heated?
Hydrogen bonds are broken.
The atomic number of neutral sulfur = 16. How many electrons does a sulfur atom have in its valence shell?
which subatomic particles are directly involved in an atom's chemical activity?
The cells of the human body are about __________% water. Six elements together make up about 99% of the body. These are oxygen, carbon, hydrogen, __________, __________, and __________.
70; nitrogen; calcium; phosphorus
Drinking a buffering solution, such as milk of magnesia, after eating a very acidic meal would be likely to have which of the following effects on the pH of a person's stomach contents?
The pH would increase.
Water has different properties from its components hydrogen and oxygen. Such properties are called __________.
A deficiency of __________ is the world's most common nutritional deficit.
Which of the following is the best definition of a polar molecule?
a molecule with an unequal distribution of charges
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