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ORHS Fr. Honors Bio Ch 4
N/A
24
Biology
9th Grade
10/07/2008

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Term
matter
Definition
anything that has massnd occupies space
Term
atoms
Definition
the smallest basic piece of an element
Term
element
Definition
a pure substance that cannot be broken into any simpler substances
Term
How many elements are found in living organisms?
Definition
20
Term
What are the elements that makep 96% of the human body?
Definition
Oxygen, Nitrogen, Carbon, Hydrogen
Term
trace elements
Definition
elements that are needed in small quantities for growth, development, and physiology of the organism
Term
molecule
Definition
the smallest particle of a compound that has all the chemical properties of that compound
Term
valence electrons
Definition
electrons in the outer-most shell of the atom
Term
What does the chemical activity of an atom depend on?
Definition
covalent bonding
Term
What are the two types of bonds?
Definition
ionic and covalent
Term
Ionic bond
Definition
a chemical bond in which one atom gives up an electron to another
Term
Covalent bond
Definition
a chemical bond in wich electrons areshared
Term
How many elemets does glucose have?
Definition
3
Term
How many molecules does glucose have?
Definition
31
Term
How many oxygen atoms does glucose have?
Definition
6
Term
How many hydrogen atoms does glucose have?
Definition
1
Term
How many carbon atoms does glucose have?
Definition
12
Term
What are the properties of an acid?
Definition
a pH lowerthan 7
Term
What are the properties of a base?
Definition
a pH higher than 7
Term
What are the properties of a buffer?
Definition
resists changes in its pH
Term
What are the properties of water?
Definition
cohesive, moderate temperature, expansion upon freezing, versatility as a solvent
Term
solution
Definition
a solute dissolved in a solvent
Term
solute
Definition
something being dissovled (i.e kool aid powder)
Term
sovent
Definition
something that has solute being dissovled in it (i.e. water)
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