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Chapter 2, Section 1. Elements and Compounds. Date: HW: 2.1 CTG, pg. 109 #1-4. LO: Explain matter Explain the differences between elements and compounds SC: Decompose water by electrolysis into the two elements from which it is composed Test 2 elements to determine their identities - PowerPoint PPT Presentation
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Chapter 2, Section 1
Elements and Compounds
Date:HW: 2.1 CTG, pg. 109 #1-4
• LO:– Explain matter– Explain the differences between elements
and compounds
• SC:– Decompose water by electrolysis into the
two elements from which it is composed– Test 2 elements to determine their
identities– Learn one way to determine the chemical
formula of a material– Compare characteristic properties of a
material to those of its constituent elements
– Represent materials with chemical formulas using numbers and the symbols of elements.
– Practice safe laboratory techniques with flames and explosions
• Do Now:– Read Chapter Challenge
on pg 98-99– Copy LO and SC on new
left side page– WDYS/WDYT-Pg. 101
• You must write at least 2 sentences for each and talk about the SCIENCE!
• Agenda:– Do Now– Investigate– Summary
Do Now:
• Do Now:– Number your notebook pages (1-100 at least)– WDYT-Pg. 101• You must write at least 2 sentences for each and talk
about the SCIENCE!
• Set up notebooks, 1-12– Teacher directed
Do Now
• Open up your notebook, check to make sure that you have it set up for notebook check
• Grab a book and turn to p. 102• Turn to a partner and describe what is going to
happen!
Investigate
• #1 Complete in your notebook, discuss at your table• #2 Complete in your notebook, share at your tables• #3 watch teacher demo of how to set up apparatus• Set up notebooks-teacher led• Assign jobs, complete #4-7
– You must wear safety goggles and aprons at all times!– Do NOT play around, you will lose lab privileges!
• Answer #9
Do Now:
• On p. 101, read through and answer question 1
• Skim through the investigationHW Due Friday: CTG p.109 #1-4
Do Now
• Open up to p. 102– Complete notebook up until number 9 (10
minutes)
Teacher Demo
• #10-12 while running electrolysis
Summary
• Explain how zinc and HCl produced Hydrogen?
• Read through the chem talk—p. 104-107
– When finished, answer the checking up questions in the margin of the last page.
Chem Talk
• What is an element?
• Name 5 elements that you know
• An element is any material that cannot be broken down into simpler materials by chemical means
Chem Talk
• What is Matter? • Anything that is made up of 1 or more elements
• EVERYTHING IS MATTER!
• Different combinations of elements make different things
Chem Talk
• What is Chemistry? • The study of the properties of elements, how the elements combine, the properties of these combinations, and the energy changes that result from these combinations.
Chem Talk
• How do we represent elements?
• We use Symbols to represent elements– O=Oxygen– H=Hydrogen– Cl=Chlorine
• 1st letter is always capitalized• If there is a 2nd letter, it is
lower case– Zn=Zinc– Pb=Lead
• Symbols can be found on the periodic table
Chem Talk
• What is a compound? • When elements combine to form new substances
• Compounds have entirely new characteristics
• Like combining letters to make words
• H2O is a compound – 2 Hydrogens– 1 Oxygen
Chem Talk
• What is electrolysis? • Using electricity in an ionic solution to result in a chemical change
• You did this in the lab when you decomposed water into Hydrogen and Oxygen in the test tubes
• The compound water has very different characteristics from H and O
Chem Talk
• How do we represent Compounds?
• Use a chemical formula– Combination of element
symbols in definite numerical proportions• H2O=2Hydrogens and 1
Oxygen• CCl4=1 Carbon, 4
Chlorines• CO2=?
Chem Talk
• Why do we write chemical equations?
• To “show” what is happening in a chemical reaction
• g=gas, l=liquid, s=solid, aq=aqueous (dissolved in water)
Chem Talk
• Remember Conservation of Mass?
• Matter cannot be created or destroyed…
• What we start with we have to end with!
• We need to apply this to chemical equations
Chem Talk
• More on Conservation of Mass…
• Unbalanced equation…
• Try balancing on your own…
•
Video: Ring of Truth
• http://www.youtube.com/watch?v=buFe-CyQctQ
Proficiency Check:
• Explain the main differences between an element and compound
Proficiency Check
Element or Compound
C CaNaNO3
CO Co
Do Now:
1. Write out the type and how many elements are in the compound.
NaCl H2SO4
C12H22O11 Ba(NO3)2
Summary
2. Go through and prove that you satisfied the Learning Objective
Highlight (underline) areas in your notebook and write a paragraph (2 or 3 sentences) talking about those areas
Worksheet
Do the worksheet on a separate sheet of paper
Summary
Go through and prove that you satisfied the Learning Objective
Highlight areas in your notebook and write a paragraph talking about those areas
When finished:
Essential Questions-pg. 108– What does it mean?– How do you know?– Why should you care?
Chem To Go (CTG)
• Pg. 109, #1-4