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CH2

Biology 1301

QuestionAnswer
what are the four elements make up more than 96% of the mass of most living organisms Carbon. oxygen, nitrogen, hydrogen
A substance that cannot be broken down into simpler substances by ordinary chemical or physical techniques is a(n) ____. element
The substance H2O is considered to be both a molecule and a compound.
The substance O2 is considered to be a molecule but not a compound.
What is the atomic mass number of an atom with 7 electrons, 7 neutrons, and 7 protons? 14 daltons
The isotope 14C undergoes radioactive decay with a neutron splitting into an electron and a proton. This decay produces an atom of nitrogen
Sodium has one valence electron in its third energy level. To reach a stable energy configuration, sodium will tend to give up an electron to another atom
True or false: argon (8 valence electrons) is likely to be chemically reactive false
True or false: carbon (4 valence electrons) is likely to share electrons with other atoms in joint orbitals? True
The chemical bonds that form when atoms that have lost electrons are electrically attracted to atoms that have gained electrons are called ____. ionic bonds
The chemical bonds that are formed when atoms share electrons equally are called ____. nonpolar covalent bonds
The chemical bonds that are formed when atoms share electrons unequally are called ____. polar covalent bonds
Which of the following types of chemical linkages is the weakest? van der Waals forces
In contrast to ionic bonds, covalent bonds ____. have distinct, three-dimensional forms
A mixture of vegetable oil and water will separate into layers because oil is ____ and forms ____. hydrophobic; nonpolar associations
When added to water, a base will act as a ____ and cause the pH of the solution to ____. proton acceptor; rise
A pH of 6 is ____ times more ____ than a pH of 2 10,000; basic
Without ____, living organisms would often experience major changes in pH in their cells. buffers
Created by: TejasRanger29
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