chapter 2, section 1 elements and compounds. date: hw: 2.1 ctg, pg. 109 #1-4 lo: – explain matter...
TRANSCRIPT
![Page 1: 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](https://reader033.vdocuments.us/reader033/viewer/2022051621/56649f505503460f94c72599/html5/thumbnails/1.jpg)
Chapter 2, Section 1
Elements and Compounds
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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
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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!
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• Set up notebooks, 1-12– Teacher directed
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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!
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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
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Do Now:
• On p. 101, read through and answer question 1
• Skim through the investigationHW Due Friday: CTG p.109 #1-4
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Do Now
• Open up to p. 102– Complete notebook up until number 9 (10
minutes)
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Teacher Demo
• #10-12 while running electrolysis
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Summary
• Explain how zinc and HCl produced Hydrogen?
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• Read through the chem talk—p. 104-107
– When finished, answer the checking up questions in the margin of the last page.
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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
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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
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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.
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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
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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
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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
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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=?
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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)
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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
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Chem Talk
• More on Conservation of Mass…
• Unbalanced equation…
• Try balancing on your own…
•
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Video: Ring of Truth
• http://www.youtube.com/watch?v=buFe-CyQctQ
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Proficiency Check:
• Explain the main differences between an element and compound
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Proficiency Check
Element or Compound
C CaNaNO3
CO Co
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Do Now:
1. Write out the type and how many elements are in the compound.
NaCl H2SO4
C12H22O11 Ba(NO3)2
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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
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Worksheet
Do the worksheet on a separate sheet of paper
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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?
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Chem To Go (CTG)
• Pg. 109, #1-4