8th Grade Physical Science
2nd Nine-Weeks Exam Review
1. An ionic bond is the attraction between
2. A chemical bond formed when two atoms share electrons is called a(n)
3. From an element’s location in the periodic table, you can predict
4. Which of the following will NOT increase the rate of a chemical reaction?
__ Using sugar cubes instead of granulated sugar
__ Raising the temperature of cake batter
__ Breaking a sugar cube into granules
__ Increasing the concentration of sodium hydroxide in a clogged drain
5. How do the atoms in a liquid state compare with the same atoms in a solid state based on energy?
6. A liquid mixture in which particles can be seen and easily separated by settling or filtration is
7. How is a solute different from a solvent in a solution?
8. Weak tea is an example of a
9. When you add so much solute that no more dissolves, you have a ______.
10. What is one way to increase the solubility of sugar in water?
11. What are the characteristic properties of acids?
12. What are some likely uses for a base?
13. In a water solution, how do acids differ from bases based on the ions formed?
14. The pH scale measures
15. Neutralization is a reaction between a(n)
16. Normal rainfall is slightly acidic, which means its pH must be around what numbers?
17. When a few spoonfuls of sugar are mixed into a cup of water, sugar is the
18. A measure of how well a solute can dissolve in a solvent at a given temperature is that substance's
19. What does it mean if a compound has a solubility of 15 g in 100 g of water at 0oC?
20. A mixture containing particles that are too small to be seen easily but are large enough to scatter a light beam is called a
21. You can find the pH of a substance by using
22. One example of a physical change is
23. One example of a chemical change is
24. A chemical equation thatshows the same number of each kind of atom on both sides of the equation is said to be
25. What happens when chemical bonds break and new bonds form?
26. CaCO3 represents a chemical
27. A shorter, easier way to show chemical reactions, such as 2H2 + O2 → 2H2O, is called a
28. The substances listed on the left side of a chemical equation are the
29. The substances listed on the right side of a chemical equation are the
30. In chemical reactions, what does the principle of conservation of mass mean?
31. Which of the following is a balanced chemical equation?
__ H2O2 → H2O + O2
__ 2 Fe2O3 + 3C → 4 Fe + 3 CO2
__ SO2 + O2 + 2 H2O → 4 H2SO4
__ 2 Mg + HCl → MgCl2 + H2
32. A chemical reaction that absorbs energy is described as
33. The minimum amount of energy that has to be added to start a reaction is the
34. Which of the following does NOT increase thenumber of particles of a substance available to react in a chemical reaction?
__ increasing the concentration
__ increasing the surface area
__ adding a catalyst
__ increasing the mass
35. A material used to decrease the rate of a chemical reaction is a(n)
36. The number placed below an element's symbol in a chemical formula is called a
37. When a solute is added to a solvent, the freezing point of the solution is
38. In water, bases form