Atomic Models

Do a research and explain what was the idea of the atom the following people had. Draw a picture of each model and write a brief description on this matter. If you need help do not hesitate writing a comment.
At the end of this post you will find a YouTube video explaining this topic.

Democritus



John Dalton



Joseph J. Thomson



Ernest Rutherford


Niels Böhr

Buoyant Force and Density Homework

Archimedes Principle Worksheet

Watch the video then read the following article and examine the examples and then answer the questions below.

4 2 Arch Prin Ws Answers-1-1 by Divanny Correa on Scribd

A block of gold and a block of wood both have the same volume. If they are both submerged in water, which has the higher buoyant force?

2. A 100-cm3 block of lead that weighs 11 N is carefully submerged in water. One cm3 of water weighs 0.0098 N.
a. What volume of water does the lead displace?
b. How much does that volume of water weigh?
c. What is the buoyant force on the lead?
d. Will the lead block sink or float in the water?


3. The same 100-cm3 lead block is carefully submerged in a container of mercury. One cm3 of mercury weighs 0.13 N.
a. What volume of mercury is displaced?
b. How much does that volume of mercury weigh?
c. What is the buoyant force on the lead?
d. Will the lead block sink or float in the mercury?

4. According to problems 2 and 3, does an object’s density have anything to do with whether or not it will float in a particular liquid? Justify your answer.

5. Based on the table of densities, explain whether the object would float or sink in the following situations:
                             material                                    density (g/ cm3)
                             gasoline                                               0.7
                             gold                                                     19.3
                             lead                                                     11.3
                             mercury                                              13.6
                             molasses                                             1.37
                             Paraffin(wax)                                     0.87
                             platinum                                             21.4

a. A block of solid paraffin (wax) in molasses. Answer - floats
b. A bar of gold in mercury. Answer - sink
c. A piece of platinum in gasoline. Answer - sinks
d. A block of paraffin in gasoline. Answer -sink

Scroll down to find the materials that you have to bring for our experiment.

Density Experiment

Rainbow in a Jar

Items Needed (Only one set per team, 3-people team)

• 1/4 cup Honey
• 1/4 cup Blue Dish Soap
• 1/4 cup Water
• 1/4 cup Corn Syrup
• 1/4 cup Olive Oil
• 1/4 cup Rubbing Alcohol
• Beeds
• Bolt
• Corn Kernell
• a tiny dice
• a dry bean

Instructions

1. Add one drop of red food coloring and one drop of blue food coloring to 1/4 cup of honey and stir until combined. This is create a purple color liquid. Pour the purple liquid carefully into the tall jar.
2. Next add about 1/4 cup of blue dish soap to the tall jar.
3. Then add a few drops of green food coloring to 1/4 cup of water and mix until combined. Then carefully pour the green liquid into the tall jar. Tip: When pouring in the green liquid, tilt the jar so the liquid runs down the side of the jar slowly.
4. Wait a few moments and then slowly pour 1/4 cup of olive oil into the jar. Tip: Again, be very careful when pouring in the liquid. Make sure to tilt the jar and pour very slowly so the colors don’t mix.
5. Add a few drops of red food coloring to 1/4 cup of rubbing alcohol and mix until combined. Then carefully pour the red liquid into the tall jar. Tip: I can’t stress enough how important it is to tilt the jar and pour slow. Otherwise the colors will mix together and you won’t get a distinct rainbow.

Changes of State

Review the information presented in class today and complete the worksheet below:

Fill in the phase changes in the blank provided.
 

Phase Change Worksheet

   The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph to answer the following questions.At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _______________ volume and _____________ shape. With each passing minute, _____________ is added to the substance. This causes the molecules of the substance to ____________ more rapidly which we detect by a ________________ rise in the substance. At point B, the temperature of the substance is ______°C. The solid begins to __________. At point C, the substance is completely ____________ or in a ___________ state. Material in this phase has _______________ volume and _____________ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ___________ to a ___________. This heat energy is called the latent heat of fusion.
Between 9 and 13 minutes, the added energy increases the ______________ of the substance. During the time frompoint D to point E, the liquid is ___________. By point E, the substance is completely in the __________ phase. Material in this phase has _____________ volume and ___________ shape. The energy put to the substance between minutes 13 and 18 converted the substance from a ___________ to a ___________ state. This heat energy is called the latent heat of vaporization. Beyond point E, the substance is still in the ______________ phase, but the molecules are moving _______________ as indicated by the increasing temperature.

Which of these three substances was likely used in this phase change experiment?

Substance	Melting point	Boiling point
Bolognium	20 °C	100 °C
Unobtainium	40 °C	140 °C
Foosium	70 °C	140 °C

BONUS: For water, the value for the latent heat of vaporization is 6.8 times greater than the latent heat of fusion. Imagine we were adding heat at a constant rate to a block of ice in a beaker on a hot plate, and it took 4 minutes for the ice to melt completely. How long would it take, after the water started boiling, for the beaker to be completely empty (the liquid water totally converted to water vapor)?

Mixtures Worksheet

Complete the table as you listen to some relaxing music:

Assignment Given so far

Good day Class!

Here you will find a list of the assignments that we have covered so far in Physical Science, if you haven't done any of them try to catch up ASAP. Progress report is around the corner.

STOP!
Don't forget this 2 things

1. Finish the homework that is due today, and
2. Bring the following materials for our experiment this coming friday
a) two pieces of pencil
b) table salt
c) a battery (D size or 9 volts) or an old charger for laptops or cellphones
d) a 4" x 6" piece of carton
e) two pieces of wire (not too thick, the thinnest you can)

Extra: Try to bring egg white

Now you can go ahead and check the list of assignment:

1. Chapter 1 Key terms and Key ideas. Define the keyterms and write the key ideas
2. Branches of science - this was the conceptual map of botany, zoology, ecology, etc.
3. Scientific Method: It was a worksheet about experiments with mice, size of cage, amount of water
4. Scientific Notation: Writing huge numbers in power of 10
5. Operations with scientific notation: Multiplication and division with numbers written in SN
6. SI units: the units use the measure length, mass. Meters, Kilograms, seconds
7. Beans Project
8. Quiz 1
9. Unit Conversion: Exercises to convert between grams and milligrams
10. Significant Figures.
11. Operation with significant figures
12. Graphing Data: Line graph, pie graph and bar grap
13. Graphs in magazines or newspapers
14. Chapter 2 Key Terms and Key Ideas
15. Elements, Compounds and Mixtures. What they are made up of, what is the difference.
16. Classifying Matter