Science+5

Welcome to your class wiki! In this space, it is my hope that we will be able to creatively share with others what we are learning in class. This space is yours to collectively and collaboratively communicate your knowledge and understanding of scientific concepts.

2-19-08 During the month of February we have been studying mixtures. We have learned the difference between hetergeneous and homogeneous mixtures. We have also learned how to tell the difference between real substances and mixtures.Like milk is a mixture because of the different types of milk. Other things we have learned and studied are saturated and unsaturated substances. The difference is that saturated substances have the maximum amout of solvent at a given temperature. Unsaturated substances have less the maximun amout at a given temperature. There is also a supersaturated substance which can go above the maximum amount of solvent at a given temperature. These are just some of the things we have learned during the month of February.

2-19-08 Today for our class we learned how to calculate concentrations.We have done a work sheet and it was fun and educational. On the worksheet we have steps or directions and it contained formulas on how to calculate concentrartion.For example we had a problem such as what is the percent comncentration of alcohol by volume of a 400 mL solution that contains 250 mL of alcohol?To answer the question we had to use the solution which was x=250mL/400mL mulitipied by 100 which gave us the percent which is 62.5%.

2-29-08 During this month we have been studying mixtures, solubility, and solutions. A mixture contains more than one kind of substance. Solubility is a measure of how well a solute can dissolve in a solvent at a given temperature. Solutions are homogeneous mixtures that form when one substance is dissolved in another substance. When they are dissolved they maintain their indivdual properties but may change colors or other physical properties. You can separate them by the boiling of components, magnetism, settling, evaporation, filteration, chromatography, and centrifuge.

3-11-08 Today we did an experiment with cars and marbles to figure out their velocity. We use different types of ramps to make them go faster or slower.We timed marbles to see how fast they went down the motion track. We learned that we have to learn in scientific order.

3-12-08 Today we had a long discussion about our car experiment we did yesterday.

3-14-08 Today we are doing an experiment with cars. This time, instead of just creating an experiment ourselves, we got directions. First, we cleared a space for us to launch the car. Then, we made a ramp out of the materials we had(a stack of books and a wooden ramp). Next, we took masking tape and made marks on the floor from 0 to 2.5 meters. Lastly, we let the car go down the ramp while timing it to determine the average speed. We repeated this experiment several times.

3-17-08 Today, we took notes on Momentum. The homework is "The Laws of Motion".

3-18-08

Today we did an experiment. It was called Momentum in a collision. Our experiment consisted of 2 rulers, 2 marbles, and a book. one of the va ribles in this experiment was the fact that the rulers had holes in them.So the marble slowed down when it hit the holes. A nother variable is the height of the ramp.

3-19-08 Today, we had a long discussion on the experiment that we did yesterday. Objects that have alot of mass will also have alot of momentum. Also objects that have a small amount of mass can have a large momentum if they have a high velocity. Momentum can be transferred from one object to another object. The experiment showed that when the small marble was launched and collided with the other stationary marble. The collision casued the first marble to stop moving while it sent the stationary marble in motion. the same thing happend in the demo that Mrs J did for us in class with the Newton's cradle.

3-20-08 Today, we learned how to solve equations for Motion. We had to do a worksheet on figuring out the speed and the velocity for certain problems. For example: A car travled 1025 kilmoeters from El Paso to Dallas in 13.5 hours. What was its average velocity? First you divide 13.5 hours into 1025 kilometers. Once you do that, you get an answer of 75.9 km/h East. The only reason you put East is because velocity is the speed and direction of the object, unlike speed which is just how fast the object is moving.

3-25-08 Today we went over our study guides that were assigned over the Easter Vacation. The study guide consists of fill in the blanks and unscambling vocab words. Our study guide's were on the subjects of motion, momentum, velocity, acceleration, and deceleraction. Our notebook test is Tomorrow and our unit test is on Thursday, March 27, 2008. The test will consist of all of the material we have been going over for the past couple of weeks.



4-2-08 Today we are trying to make vidios and pictures about science for the future of 8th graders in Endless. We learned that people can be so nice to others. Tammy Sparth is the person who used her money to buy a cameria for our scienctific experiences so we can record everything about science in the wikipage.We are also writing thank letters for her kindness to help our website.

4-15-08 Today we are doing an experiment that tests a hot wheels car on three different surfaces (sand paper, cardboard, and wax paper). It invovled us using Newton's second law (F=ma).

4-25-08 Tody we made balloon cars. We raced them to see how far they got. Two meters was an a. We also learned about Newtons laws. We tested our balloon cars today. Everyone's car had gotten past the 2 meters so we all got an A.

5/12/08 to figure out work, power, or force you only need to know a few things Force=mass*Acceleration,Work =distance*force (weight),Power = work /time. The unit for force is newtons,the units for weight are newton meters or joules,and the unit for power is watts.The definition of work is force in the same direction as the motion of an object that the force is acting upon.Remembergravity is a force .9.8 is the acceleration due to gravitey.

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