Chapter 4 Reading Assignment
1. What is matter?
2. What does mass mean?
3. What are two properties (types) of matter?
Give 2 examples of each.
4. How can we identify the an element by what it has?
5. What is an atom?
6. What is the nucleus of an atom?
7. What are the three subatomic particles?
Identify their mass, charge and location.
8. Why does the nucleus of an atom have positive charge?
9. How much of atom’s mass does the nucleus make up?
10. How much of an atom’s volume does the nucleus make up?
11. What makes up the most volume of an atom?
12. What is an electron cloud?
13. Why are electrons attracted to the nucleus of atom?
14. What holds the electrons in an atom?
15. What is an isotope?
16. Why do different isotopes of the same element have slightly different
properties?
17. Why does the periodic table use an average atomic mass for each element?
18. What does average atomic mass mean?
19. What is the average atomic mass of hydrogen, according to the periodic
table?
20. In groups 13-18 on the periodic table, what is the number of valence
electrons in each atom?
21. What is the main difference between metals and nonmetals?
22. Explain the equation CH4 + 2O2 → CO2 + 2H2O.
23. When is a chemical equation balanced?
24. Why can you not change chemical formulas to balance an equation?
25. What is a covalent bond?
26. What is a covalent compound?
27. What is a polar covalent bond?
28. What is a homogeneous mixture?
29. What is a solution?
30. What is dissolved the solution known as sea water?
31. What is an alloy?