Your Name_________________________________________Period_________Teacher_________________________Today’s Date___________________________

Chemical Reactions

This packet will be practice in the following 8th Grade Standards:

I can compare and contrast physical and chemical changes and describe how the laws of conservation of mass applies to these changes

Name ____________________________________________________________________ Period

Periodic Table Unit VocabularyUnit Vocabulary List – Keep track of all of the unit’s vocabulary words as we go. For each

word, include a definition and a sketch.

Term Definition Sketch

Term Definition Sketch

Physical and Chemical Changes Conclusion

Instructions: Read section 1.1 in your textbook. Fill in the indicated words in your vocabulary sheet. When you are done reading, answer the following questions:

1. Name two indications that a chemical change has occurred.___________________________________________________________________________________________

2. What is the difference between a physical and a chemical change? ___________________________________________________________________________________________ 3. A sheet of paper is torn in half. Another sheet of paper is burned. A third sheet of paper is crumpled into a ball.

a. What kind of change has each sheet of paper undergone?torn ___________ burned ____________ crumpled ____________

b. In which sheet(s) of paper have the molecules changed? ________________________________________________________ c. In which sheet(s) of paper have the molecules not changed? ________________________________________________________4. Classify each example as a physical change or a chemical change. Give one piece of evidence for each classification.

example kind of change

evidence

penny flattened by a hammerrusting metal

glass of juice frozen, melted, and refrozenchewing a cookie

breaking a tooth

cooking an egg

Physical Change

Chemical Change

On a separate sheet of paper, answer the following questions IN COMPLETE SENTENCES about your lab results:

1. What is a chemical change?2. What is a precipitate and which reaction gave you a precipitate?3. What are six signs you observed that a chemical reaction took place during this lab?4. What are three chemical reactions that you observed over the last week?

Reaction ObservationsBefore

Observations During

Observations After

1

2

3

4

Notes: Conservation of Mass

Essential Question ___________________________________________________________________________________________________________________________________________________________________________________________________________

Main Ideas Supporting Details

Supporting Details

Counting Atoms Worksheet Name: _____________________

Directions for each problem 1) write down the different elements in each compound. 2) write down how many of that particular atom there are 3) how many atoms are there total in the compound.

Examples: 1) NaOH Na - 1 O - 1 3 total H - 1

1) NaOH 6) 4 HNO3 11) 4 CaBr2

2) MgCl2 7) 4 Li2O 12) 2 KNO3

3) Li2SO4 8) 3 H2O 13) 4 MgSO4

4) NaC2H3O2 9) 3 Al2O3 14) 2(NH4)3PO4

5) NH4Cl 10) 5 ZnSO4