CHP 2 Atoms & Molecules The chemical basis of life

Question 1

element

Answer 1

substance can’t be broken down to simpler means.

Question 2

atom

Answer 2

smallest part of element.

Question 3

isotopes

Answer 3

same atomic number, different N.

Question 4

oxidation vs reduction

Answer 4

oxidation= gain O2
Loss of E-
Loss of H2

reduction= Loss of O2
Gain E-
Gain H2

Question 5

properties of water

Answer 5

H partial positive attaches to O partial neg (due to different charges)
water covers 70 percent of earth
universal solvent dissolves polar molecules
polar
forms H bonds between more electroneg atoms or groups
boils 100c
can break down bonds ie NaCl

Question 6

cohesion

Answer 6

attraction between molecules of same subs
water molecules drawn together producing surface tension ie ball floating on water
sticks together or itself ie sea and river

Question 7

adhesion

Answer 7

attraction between molecules of different subs
capillary reaction= water to rise against force of gravity
ie- water moves up from the plants roots all the way up or water rising in a narrow tube.
sticks to other things.