click below
click below
Normal Size Small Size show me how
Biology Chapter 2
Chapter 2 information to study for test
Question | Answer |
---|---|
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. |