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BIO120-Chem of Life

BC - Chemistry

This number equals the number of protons in an atom. Atomic Number
Which of the properties of water listed in your notes are due to the polarity of the water molecule? All of the properties of water.
These bonds are formed when electrons are shared. Covalent Bonds
The charge for a neutron. Neutral - no charge
The charge for a proton. Positive
The 2 types of particles found in the core of an atom. Protons and neutrons
Diatomic nitrogen is held together by how many covalent bonds? triple covalent bond
This equals the number of protons plus the number of neutrons in an atom. Atomic Mass (or Mass Number)
These chemical bonds are fomed when one atom gains an electron(s) and the other atom involved loses an electron(s). Ionic bonds
Hydrogen bonds are based upon this type of covalent bond (choose either polar or non-polar). Polar Covalent Bonds
What 3 particles make up an atom? Protons, Neutrons & Electrons
Give an example of a compound formed due to ionic bonding. NaCl
The charge found on an electron. Negative
This equals the number of protons in an atom. Atomic Number
The term used for anything that takes up space and has mass. Matter
A substance that cannot be broken down to other substances by chemical reactions. Element
A molecule consists of two or more atoms held together by covalent bonds. Molecule
The natural elements which are required for life. Essential elements
The natural elements required by an organism in very small amounts. Trace elements
Atoms of the same element have the same number of _______. Protons
Isotopes are two atoms of an element with different numbers of ______. Neutrons
A parent isotope decays into a daughter isotope at a fixed rate known as _____. the half-life.
______ is defined as the capacity to do work or cause change. Energy
Electrons which occupy the outermost shell of an atom are termed _____. Valence
Chemical ______ are interactions between atoms are generally determined by the valence _______. Bonds; electrons
When atoms share one pair of electrons it forms a _____. Single covalent bond
When atoms share two pairs of electrons it forms a _____. Double covalent bond
Diatomic hydrogen is formed from a _______ covalent bond. Single
Diatomic oxygen is formed from a _______ covalent bond. Double
______ covalent bonds occur when electrons are shared equally among the atoms. Non-polar
______ covalent bonds occur when electrons are shared not equally among the atoms. Polar
An atom that has either gained or lost an electron is known as an _______. Ion
An atom that has gained an electron is known as a(n) _______ and is _______ charged. anion; negatively
An atom that has lost an electron is known as a(n) _______ and is _______ charged. cation; positively
The making and breaking of chemical bonds are collectively termed: chemical reactions
The molecules which are evident at the start of a chemical reaction are called: Reactants
The molecules which are evident at the end of a chemical reaction are called: Products
Reactions that proceed in both the direction of reactants and products are called _______. Reversible
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