48 points ! and
word bank:
acid, atomic number, base, buffer, chemical bond, chemical reaction, covalent bond, crystalline, hydrophilic, hydrophobic, ionic bond, isotope, matter, neutron, ph, physical property, polar molecule, proton, radical, radioactive

write the word or words from the word bank that best completes each sentence.

1. two atoms are held together by a(n) when an electron transfers from one atom to the other.

2. a(n) molecule can be dissolved in a water solution, but a(n) molecule does not mix with water.

3. the ability of water to change from solid to liquid is a(n) of water.

4. a(n) is a tiny particle in the nucleus of an atom that has a positive electrical charge.

5. atoms with a(n) electrons.

6. a(n) of an atom has the same atomic number but a different atomic mass.

7. a solution with a of 7.0 is considered to be neutral.

8. a(n) is a group of atoms that behave like they are one ion.

9. the number of protons in the nucleus of the atom is called the

10. a(n) donates hydrogen ions to a solution, but a(n) accepts hydrogen ions..

11. a(n) has no charge and is found in the nucleus.

12. anything that has mass and takes up space is

13. a solution that can receive moderate amounts of acid or base without changing its ph is a(n)

14. the rearranging of the chemical makeup of matter is called a(n)

15. water is a(n) because its opposite ends have opposite electric charges.

16. as they change to another substance over time, elements give off energy.

17. two or more atoms linked by a(n) form a molecule.

18. a(n) substance has a regularly repeating arrangement of atoms.

write the letter of the answer that completes each sentence correctly.

19. the central part of an atom is the

a nucleus

b neutron

c proton

d molecule

20. water is made up of two atoms and one atom.

a oxygen, hydrogen

b sodium, hydroxide

c hydrogen, oxygen

d carbon, oxygen

21. which of the following is a radical?

a h

b o

c h2o

d oh

write the answers to the following questions. use complete sentences.

22. explain the trend that atoms of certain elements give up or accept electrons based on their position in the periodic table.

23. what are the reactants and the product in the following reaction? c+o2 > co2

24. give an example that shows water is an excellent solvent.

25. explain three ways the special properties of water make it an important biological solvent.