Chapter 2: chemistry of life

Question 1

Matter

Answer 1

Anything that takes up space and has mass

Question 2

Element

Answer 2

Substance that cannot be broken down to other substances by chemical reactions

Question 3

What 3 elements make up 96% of living matter

Answer 3

Carbon, hydrogen, oxygen

Question 4

Trace elements

Answer 4

Only required by an organism in limited quantities

Question 5

Atom

Answer 5

Smallest unit of matter that still remains the properties of an element

Question 6

Isotopes

Answer 6

Are two atoms of an element that differ in number of neurons

Question 7

Potential energy

Answer 7

Energy that matter has because of its location or structure

Question 8

Atoms with a incomplete valence shell are:

Answer 8

Reactive

Question 9

Covalent bond

Answer 9

Sharing of a pair of valence electrons by 2 atoms

Question 10

Electronegativity

Answer 10

Atoms attraction for the electrons in a covalent bond.

More electronegative = more strong pulling electrons toward itself

Question 11

Hydrogen bonds are with what elements

Answer 11

Oxygen, fluorine, nitrogen