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Biology Chapter 2

Chapter 2 information to study for test

What elements make up the majority of all living organisms Carbon, Hydrogen, Oxygen, and Nitrogen,
18% Carbon
10% Hydrogen
65% Oxygen
3% Nitrogen
Smallest particle of an element thqat displays the properties of the element. Atom
Substance that can not be broken down into substance with different properties; composed of only 1 type of atom. Element
Union of 2 or more atoms of the same element Molecule
Substance having 2 or more different elements united chemically in a fixed ratio. Compound
What charge is a proton + positive
What charge is a electron - negative
What charge is a neutron no electrical charge
_______________ _______________ is equal to sum of protons and neutrons. Mass Number
____________ have about zero mass. Electrons
Which ions are attracted to one another by opposite charges Ionic
Which atoms share one or more pairs of electrons Covalent
Weak chemical bond between a slightly positive hydrogen atom on one molecule and a slightly negative hydrogen on another molecule. Hydrogen
Have the same number of protons but a different number of neutrons is called _____________ Isotapes
Mathematical way to indicate the number of hydrgen ions in solution,. PH Scale
A measure of acidity or alkalinity of water soluble substance is _______ _______________ PH Scale
PH below 7 is acidic
More H+ than OH- acidic
PH above 7 is base or basic
More OH- than H+ Base or basic
OH- is hydroxide ions or NaOH
H+ is HCI
Ability of water molecules to cling to each other due to hydrogen bonding Cohesion
Ability of water molecules to cling to other polar surfaces. Adhesion
Allows water to be excellent transport system both in and outside of living organisms Adhesion
Contributes to water transport in plants Adhesion
The many hydrogen bonds linking water molecules. High heat capacity
Allow water to absorb heat without greatly changing its temperature. High heat capacity
Temperature of water rises & falls _______________. slowly.
Created by: jwatts1