Fill-in-the-blank
word box (one term per response - no repeating, but you will not use every term):
*metabolism
*covalent
electrons
hydrogen ions
*protons
*ionic
*controlled experiment
18. an experiment in which only one variable is changed is a(an)
_experiment
19. the combination of chemical reactions through which an organism builds up or breaks down
materials as it carries out its life processes is called
20. neutrons and
are found in the nucleus of an atom.
21. a chemical bond formed by the transfer of electrons is a(an)
bond
22. the ph scale is a measurement system that indicates the concentration of
in a solution

Answer and Explanation:

18. An experiment in which only one variable is changed is a(an)  controlled experiment .

19. The combination of chemical reactions through which an organism builds up or breaks down  materials as it carries out its life processes is called  metabolism.

20. Neutrons and  protons are found in the nucleus of an atom.

21. A chemical bond formed by the transfer of electrons is a(an)  ionic bond .

22. The pH scale is a measurement system that indicates the concentration of  hydrogen ions in a solution.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

the form of energy changes and the total energy increases0l