12.11.08
7th Grade Exam Topic Summaries
UPDATE: Here is the Test Outline ->midterm-review-2008
Pick one of the topics off the list. Fill out the topic review fill-in and post your summary to the blog. Remember, this will help your classmates study for the exam so post quality work. (Please put your topic title in your post)
-Mr. K
December 12, 2008 at 9:42 am
TOPIC: pH Scale
Summary:
The pH scale is a range of values from 0-14 that expresses the concentration of hydrogen ions in a solution. A low pH=a high concentration of hydrogen ions (acid). A high pH=a low concentration on hydrogen ions (base). Examples: Hydrochloric acid-1, pure water-7, drain cleaner-14.
December 12, 2008 at 9:45 am
Topic Review
Lilly and Reagan
TOPIC: Non-Metals
Summary:
Nonmetals are elements that lack most of the properties of metals. You will find Nonmetals to the right of the zigzag line on the periodic table. Many of the Nonmetals are very common elements that are extremely important to living things on earth.
Many of the nonmetal elements are gases at room temperature, which means they have low boiling points. Most nonmetals are dull, unlike shiny metals.
December 12, 2008 at 9:49 am
Topic Review
TOPIC: _Newton’s 1st law
Summary: Newton’s first law states that an object in motion will stay in motion and an object at rest will stay at rest until acted upon by an outside force. This law is also known as the law of inertia.
Key Terms
1. Inertia – Inertia is the tendency of an object to resist change in its motion. Inertia explains many common events.
Thanks,
Natalie and Jessica
December 12, 2008 at 9:51 am
TOPIC : Bernoulli’s Principle _____________________________________________
Summary Bernoulli’s Principle is that a moving stream of fluid has less pressure than the surrounding fluid. The faster a fluid moves, the less pressure it has. An airplane wing and a spoiler are good examples of Bernoulli’s principle.
December 12, 2008 at 10:00 am
TOPIC: Newton’s 3rd Law
Summary:
Newton’s 3rd Law states: “For every action, there is an equal and opposite reaction.” An example of this is throwing a ball at a wall (action), and it bouncing back (equal and opposite reaction).
December 12, 2008 at 1:11 pm
Topic Review
TOPIC: Ionic Bonds
An ionic bond is the connection between two ions that are oppositely charged. When two ions meet, the opposite charges become balanced.
Ionic bonds have a crystal form, high melting points, and they are able to conduct electricity.
December 15, 2008 at 9:16 am
Topic Review
TOPIC: Neutralization
Summary
Neutralization reactions are reactions that occur between acids and bases. Neutralization reactions produce water and a salt. A salt is made of the positive ion of a base and the negative ion of an acid. Neutralization reactions reduce the strength of an acid or a base. If the acids and bases both have equal amounts, the solution will be neutral. If there is a larger amount of the acid, and a smaller quantity of the base, the solution will remain acidic, and vice versa. If there is a greater quantity of the base, the solution will remain basic.
December 15, 2008 at 9:26 am
Newton’s 2nd law states that force equals mass times acceleration. This is the formula for calculating the force of an object.
from, Jacob and Henry
December 15, 2008 at 9:54 am
Pascal’s principal states, “When pressure increases, it increases by te same amount throughout an enclosed, or confined, fluid.” This means that when a fluid is in a container, the molecules are bouncing off the sides creating pressure. This pressure is the same amount on the whole container. But, the law also says that when something deceases the space in the container, the pressure increases and is still in equilibrium.
December 15, 2008 at 9:59 am
Summary:
the solvent is the part of a solution that is present in the largest amount, and a solute is part of a solution present in the smallest amount and is dissolved in a solvent. When a solution forms, particles of the solute change physically. They leave each other and become part of the solvent. A dilute solution is when only a little bit of solute is dissolved in the solvent. A concentrated solution is when there is a lot of solute dissolved in the solvent. Solubility is a measure of how well a solute can dissolve in a solvent at a given temperature. A saturated solution is when you have added so much solute to the solvent that no more will dissolve. An unsaturated solution is when you can still dissolve more solute. Two factors that affect the solubility in a solvent are temperature and the type of solvent. Solutes lower the freezing point of the solvent, and solutes raise the boiling point of a solvent.
December 16, 2008 at 6:20 pm
hey, ours is pressure and will be up soon-
Regan and Ana