Conservation of Mass Quiz 1/23

All questions require written responses.

Explain open and closed systems and give an example of each.

Explain the Law of Conservation of Mass.

Explain why the mass was not the same during the chemical reaction between the baking soda and vinegar even though it was supposed to be a closed system.

Using the following chemical reaction, be able to discuss the number of each type of element and whether it demonstrates the Law of Conservation of Mass.

Baking soda      +      vinegar           →       Sodium acetate        +      water        +         carbon dioxide

NaHCO₃             +      CH₃COOH       →         NaOOCCH₃              +        H₂O         +                 CO₂

Mystery powder lab

Make a title page  "Mystery Powder Lab", a picture colored, name, date, group

Attach in this order:  Title page, data table (station 1 toward front), Analysis (question 1 toward front) and rubric.

Powder Properties information:
Salt:  does not react with vinegar or iodine, has a crystal shape, less soluble than sugar.

Sugar:  does not react with vinegar, crystal shape, very soluble in water, dissolves in vinegar, truns brown when heated.

Baking Soda:  Reacts with vinegar(produces a gas), does not react with iodine, does not have a crystal shape, slightly soluble in water.

Corn Starch:  reacts with iodine, does not react with vinegar (gets thick, then hard), no crystal shape, insouble in water

Plaster of Paris:  Reacts with vinegar (produces a gas), turned grey with water, reacts with iodine(turned lighter brown), has not crystal shape, melts-then hardens in water and vinegar.


lab report due Tuesday except Yellow group (due Wednesday)

Extra points on the Characteristic Properties of matter test

http://studyjams.scholastic.com/studyjams/jams/science/index.htm

You can do up to 10 topics.  One point each one.  You cannot get a score of over a 100 on the test.  You must have a score of 90 or better or it will not be accepted. 

Click on a topic and under that heading are specific choices you can do.  (see below)

They can be e-mailed to me or printed.  Make sure your name and group color is on each page.

Choices:

MUST DO:
Under   "Properties"
                     Physical and Chemical Changes in Matter
                     Elements and Compounds
                     Solids, liquids, and gasses
Optional:
                     Energy and matter

Under  "Plants"
                      Photosynthesis

Under "Scientific Inquiry"
                       Any of them

Under  "Human Body"
                        Any of them

Properties of Matter test 1/9/15

INB page 56   Know definitions (matching on test) with examples on a few.
INB page 57   Know questions 2 - 8
INB page 58   Read your notes
INB page 59   Know how to tell the difference between an element and compound (#12) and
                      questions 18 - 21
INB page 60 and 61 - use these pages as examples for chemical and physical characteristics
INB page 62  A few examples from the front and back of the sheet are on the test.

Essay Question:  Know chemical changes when wood burns.

I WILL BE AFTER SCHOOL ON THURSDAY FROM 2:20 - 2:45 FOR ANYONE WHO WOULD LIKE EXTRA HELP.   ALSO PERIOD 1 ON TUESDAY AND THURSDAY

LAST TEST FOR QUARTER 2!!!!! STUDY, STUDY, STUDY