This school year all home assignments will be found ONLY on my website in numerical order. No class time will be given to copy a home assignment unless a textbook must be used. The prompt should be copied in blue ink. The prompt should be answered in pencil. The parent should initial or sign the completed home assignment at the end of their child's written responses. Parents/guardians who check and sign or initial their child's completed assignment will earn their child one bonus point for each home assignment that is checked and signed.
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Homework # 1 10/22/09
1. Imagine you are teaching a group of younger students about the difference between chemical and physical changes. One of the students claims the change from liquid water to water vapor is a chemical change. Write a BCR that (a) define physical and chemical change, (b) explains which type of change is actually occurring, and (c) a picture that shows the spacing of atoms in such a change.
Homework # 2 10/23/09
1. Name the following binary compounds: LiCl2, BaP3, BeF, FrBr, CaI2
Homework # 3 10/26/09
1. What is matter?
2. What is mass?
3. Why aren't mass and weight the same thing?
4. What is volume?
5. What are the metric units for determining (a) the mass of a gas, (b) the volume of a liquid, and (c) the volume of a solid?
6. Which metric tool is used to determine (a) the mass of a solid, (b) the volume of a regularly-shaped solid, and (c) the volume of a liquid?
Homework # 4 10/27/09
1. Log onto www.ebsinstitute.com/Baseball/EBS.crp2df.html
2. Print all four pages and use them to answer the questions that follow.
3. Which piece of scientific apparatus would a chemist get out to measure the mass of a substance?
4. Use the formula. Substitute in the values with the correct metric or English units. Do the math and give the final volume for (a) the rectangular prism and (b) the triangular prism shown.
5. State the formula a chemist would use to calculate the volume of (a) a cylinder, (b) a sphere and (c) a cone.
6. How would Vanessa determine the volume of a solid object that is too large to be put into the mouth of her graduated cylinder? Explain step by step.
Homework # 5 10/28/09
1. Brief Constructed Response: Margaret wants to know the density of a special prism she purchased at the Maryland Science Center. Explain, step by step, what she will have to do. In your BCR, (a) name the equipment she will need to use, (b) what she will have to do with the prism as she uses each piece of equipment, (c) the metric units and the formula she will need to use to complete her calculations and (d) how Margaret can use her calculations to determine the buoyancy of her special prism WITHOUT getting it wet.
Homework # 6 10/29/09
NOTE: All calculations must include the correct formula, the substituted values with the correct metric units and the final answer. Failure to do so will result in a zero.
1. A piece of steel has a mass of 66 grams and a volume of 22 cubic centimeters, calculate its density. Does this piece of steel have a positive or negative buoyance and how do you know?
2. What is the mass of a potato if its density is 2.1 grams/cubic centimeter and its volume is 15.3 cubic centimeters?
3. How much space does a leather strap occupy if its mass is 20 grams and its density is 1.35 grams/cubic centimeter?
Homework # 7 10/30/09
1. Amy has been given five different elements by her teacher to identify. All that she is told is that one has a positive density, one is synthetically-prepared, one was named in honor of the good samaritan from the Holy Bible, one changes into a vapor at 1180 degrees Kelvin and one is a halogen. Using this information, identify which of the five is (a) Zn, (b) Sm, (c) I, (d) Es, and (e) Li.
Homework # 8 11/2/09
1. Put about one quarter of a cup of water into a clear container. Add one teaspoon of black pepper and stir well. What do you observe? What kind of mixture is this an example of?
2. To a second clear container, put one quarter of a cup of water and add a teaspoon of salt. Stir well. What do you observe? How does this mixture differ from the first one? What kind of mixture is this an example of?
3. What other mixtures have you seen that are similar to pepper and water? to salt and water?
Homework # 9 11/3/09
1. What is the density of the following five elements: (a) chromium, (b) boron, (c) mercury, (d) potassium and (e) neptunium?
2. Which of the above elements have a negative buoyancy and which have a positive buoyancy?
3. If you placed all of these elements into a graduated cylinder of water at the same, what do you think would happen to them? Note: There will not be any chemical reaction.
Homework # 10 11/4/09
1. Compare how well sixdifferent substances dissolve in water in your home. You may choose any six substances as long as three are solids and three are liquids. Examples might incluse dish soap, hand cream, sugar, coffee, fruit juice, seasoning, etc.
2. Test each substance you selected by placing a tablespoon of the substance into about a quarter cup of water and stirring the solution well. Which materials seem to dissolve the best in the water?
3. Use your ruler and a blue ink pen to generate a chart that summarizes the results of your experimentation.
4. Which seem to dissolve more easily in the water: the solids you tested or the liquids you tested?
5. How do you think your results would have been affected if you had used hot water instead of cold water from the tap? Explain your reasoning for this response using scientific vocabbulary.
Homeworks # 1 -10 were collected on Friday, November 6, 2009 for assessment. If you did not turn yours in to me, you will receive a 10 point deduction for each and every day it is submitted late unless you were on Friday's trip to Washington, D.C.
Homework # 11 11/6/09
1. Use the internet/library/or any other reliable source of information to research the following depending upon which row you sit in during science class:
ROW ONE: History behind the Periodic Table
ROW TWO: COMPOUNDS and CHEMICAL CHANGES
ROW THREE: MIXTURES and PHYSICAL CHANGES
ROW FOUR: Acids, Bases and Indicators
ROW FIVE: 10 different Lab safety rules
ROW SIX: 10 different pieces of Scientific equipment used in the lab (name, use and picture)
Note: You may copy and paste as long you cite the source(s) you used during your research. Bring to class on Monday, November 9, 2009.
Homework # 12 11/9/09
1. ALL RESEARCH IS TO BE BROUGHT TO THE COMPUTER LAB ON WEDNESDAY, NOVEMBER 11, 2009 OR YOU WILL BE GIVEN DETENTION!!! (Do not copy this announcement.)
2. Some important acids include hydrochloric acid, nitric acid, sulfuric acid, carbonic acid, acetic acid, and phosphoric acid. Match the chemical formula with its name: (a) H2SO4, (b) H3PO4, (c) HCl, (d) H2CO3, (e) HNO3, and (f) HC2H3O2.
3. What do you notice about the formula for each acid in the above question?
Homework # 13 11/10/09
1. Some important bases include NaOH, KOH, NH3, Ca(OH)2, and CaO. Match the correct name of each base with its chemical formula: (a) ammonia, (b) calcium hydroxide, (c) sodium hydroxide, (d) calcium oxide and (e) potassium hydroxide.
2. What do you notice about the formula for some of the bases?
Homework # 14 11/12/09
1. Log onto http://www.studyisland.com
2. Click on "Science" and take 20 questions on the pretest. Take your time, your score will be recorded as basic, proficient or advanced.
NOTE: For the students who would like to get the next three ho
me assignments done over the weekend, I am posting all three. However, you will only show me one at a time starting on Monday. In addition, each one of you should be working on your webquest, powerpoint presentation, or brochure. Remember to bring your flash drive to the computer lab on Wednesday.
Homework # 15 11/13/09
1. Log onto http://www.studyisland.com
2. Go to the lesson on "Scientific Investigations." Click on the word, "lesson" and print out Formulating Hypothesis and Experimental Design. Study each printout BEFORE you take the test.
3. Click on Scientific Investigations and respond to 10 questions. If you receive a "P" or an "A," you may stop. If you receive a "B," study your printouts again and complete 10 more questions.
Homework # 16 11/16/09
1. Go to study island.
2. Find the test on "Collect and Interpret Data." Click on the word "lesson." Printout the information on Interpret Graphs. Study this information BEFORE you take the test.
3. Click on "Collect and Interpret Data" and answer 10 questions. If you get a blue ribbon, you have passed the assessment and can stop. If you did not pass the assessment, study the printouts again. Respond to 10 more questions.
Homework # 17 11/17/09
1. Go to study island and log on.
2. Find the test on "Scientific Evidence." Click on the word "lesson" and print it out. Study the printouts BEFORE you take the test.
3. Complete 10 questions on "Scientific Evidence." If you get a blue ribbon, you may stop. If you did not, complete 10 more questions on this topic.
Homework # 18 11/19/09
READ THE EXERCISE. DO NOT COPY IT.
Sam washed his favorite pair of jeans. He hung the wet jeans on a clothesline outside his apartment on a hot, sunny day. An hour later the jeans were dry.
Copy the ONE choice you think best describes what happened to the water that was in the wet jeans an hour later and then write a minimum of six sentences to provide a scientific explanation for your choice. Your choices are:
A. The water soaked into the ground.
B. The water disappeared and no longer exists.
C. The water is in the air in an invisible form.
D. The water moved up to the clouds.
E. The water chemically changed into a new substance.
F. The water went up to the sun.
G. The water broke down into atoms of hydrogen and oxygen.
Homework # 19 11/20/09
To get credit for this home assignment, you must show your math work in pencil.
1. The 8th grade will leave Francis Scott Key at 9:45 a.m. and travel to Centennial Park for a cookout. If the bus arrives at 11:17 a.m., how long was the bus ride?
2. If it takes that much time to get to Centennial Park, what time will the bus need to leave to get back to Francis Scott Key by 3:05 p.m.?
3. Find the elapsed time for each trip:
a. Leaves 6:05 a.m., arrives 7:15 p.m.
b. Leaves at NOON and arrives at 6:27 a.m.
c. Leaves at 8:36 a.m. and arrives at MIDNIGHT.