3rd 9 weeks study guide
Physical Science
1. A ____________________ formula resembles a ball and stick model of a compound
except chemical symbols are used to represent the atoms.
2. In ionic compounds, the positively charged ions are formed from
____________________ elements.
3. A(n) ____________________ bond is formed by the attraction between positively charged metal
ions and the ____________________ around them.
4. Unlike a mixture, a compound has a(n) ____________________ that is always
the same.
5. Formula units of salt, NaCl, contain equal numbers of ____________________
and ____________________.
6. How is a mixture different from a compound?
7. What are covalent bonds formed between?
8. When covalent compounds are formed, where can you find these compounds in the periodic table?
9. Given H2O, how many hydrogen atoms are there and how many oxygen atoms are there?
10. Why do gases take up a lot of space?
11. Which has stronger attractions, solid, liquid, or gas?
12. What is a cation?
13. What is an anion?
14. How many valence electrons can be in the outer most energy level?
15. How is the charge of an ion determined?
16. How many molecules of carbon are in acetic acid, C2H4O2?
17. Describe the difference between an empirical and molecular formula. Give an example of two
materials that have the same empirical formula but different molecular formula.
18. What are the forces that hold ion or atoms together?
Write the following names for these covalent formulas:
19. PCl3
20. Ga3N3
21. As2O5
____________________
______________
___________________
Name the following ionic compound and specify the charge of each atom:
22. TiS
23. NiBr3
_______________
_____________________
Write the following ionic formulas:
24. Cesium iodide
25. Calcium nitride
_______________
_______________
26. Which of the following is considered matter?
a.
Air
c.
Sound
b.
Light
d.
Electricity
27. What is it called when two or more elements join together chemically?
28. Which of the following represents an element?
a.
H20
c.
Fe2O3
b.
NaOH
d.
S8
Physical Science
3rd 9 weeks study guide
29. A mixture that is the same throughout is described as __________.
30. Two liquids that are able to dissolve into each other in various proportions are described as __.
a.
Atoms
c.
Homogeneous
b.
Immiscible
d.
Heterogeneous
31. Group 8 noble gases are inert because
a. they readily form positive ions.
b. they can have either a positive or a negative charge.
c. their outermost energy level is missing one electron.
d. their outermost energy level is full.
32. Which statement about noble gases is correct?
a. They form compounds with very bright colors.
b. They exist as single atoms rather than as molecules.
c. They are highly reactive with both metals and nonmetals.
d. They are extremely rare in nature.
33. Which statement about the alkali metals is correct?
a. They are located in the left-most column of the periodic table.
b. They are extremely nonreactive.
c. They are usually gases.
d. They form negative ions with a 1_ charge.
34. Which statement about an element’s average atomic mass is correct?
a. It is determined by counting the number of isotopes in a sample of the element.
b. It is equal to one-twelfth the mass of the most common isotope.
c. It is a weighted average, so common isotopes have a greater effect than uncommon ones.
d. It is based on an isotope’s charge, so negatively charged isotopes have a greater effect than
positive ones.
35. Oxygen has a atomic number of 8, this means that oxygen has how many protons?
36. What is ionization?
37. What is the order of element’s in the periodic table based off of?
38. According to Bohr’s model of the atom, electrons behave like
a. planets orbiting the sun.
c. light energy in a vacuum.
b. waves on a vibrating string.
d. planets rotating on their axes.
39. Dalton’s atomic theory stated that every element was made of atoms that could not be subdivided,
atoms of the same element are alike, and
a. atoms are made of protons, neutrons, and electrons.
b. the nucleus is the center of the atom.
c. atoms can join to form molecules.
d. atoms are constantly in motion.
40. Which statement about the atomic nucleus is correct?
a. The nucleus is made of protons and neutrons and has a negative charge.
b. The nucleus is made of protons and neutrons and has a positive charge.
c. The nucleus is made of electrons and has a positive charge.
d. The nucleus is made of electrons and has a negative charge.