1. Notes Tennessee SPI Objective: Classify common substances as elements or compounds based on their symbols or formulas. Science Essential Question(s) How do I interpret chemical symbols and chemical formulas to classify substances as elements or compounds? SPI 0807.9.3 Elements and Compounds Check for Understanding Describe how the characteristics of compounds are different than the characteristics of their component parts. Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher.

2. Notes SPI 0807.9.3 Elements and Compounds What Is An Element?  Each individual element is a unique particle called an atom  So in other words… elements are the different types of atoms  An element is a pure substance that CANNOT be broken down into a simpler substance by CHEMICAL means.  You CANNOT change one element into a different element with a chemical reaction Example Lithium is an element. Here is a lithium atom. 3 Li Lithium 6.9 Science

3. Examples of Elements Notes SPI 0807.9.3 Elements and Compounds Science H Na Ca -represents one sodium atom -represents one hydrogen atom -represents one calcium atom hydrogen sodium calcium More About Elements  The chemical symbols for elements always start with one capital letter  These chemical symbols can be followed by one (or more) lower case letters Ex: B, C, N, O, F, etc. Ex: He, Li, Be, Mg, etc.

4. Sodium and Chlorine Carbon and Oxygen Carbon, Hydrogen, & Oxygen NaCl CO 2 C 6 H 12 O 6 (Sodium Chloride) (Carbon Dioxide) (Glucose) What is a Compound?  The properties of the new substance (product) are different from the substances (reactants) that you started with. Examples of Compounds  two or more DIFFERENT elements that are chemically bonded via a chemical reaction to form a new substance.  Compounds are formed during chemical reactions

5. …note that it has more than 1 capital letter Notes SPI 0807.9.3 Elements and Compounds Science Examples of Compounds H2O H2O C 12 H 22 O 11 CH 3 COOH  Chemical formulas for compounds always contain more than one capital letter. This is the compound called water This is the acidic compound called vinegar This the compound called table sugar  This is how you can tell the difference between an element and a compound… count the number of capital letters! More About Compounds

6. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound Cs (Cesium) Why?...is a pure substance, consists of only one type of atom How to tell?...It only has one capital letter! Element Review Activity SPI 0807.9.3 Elements and Compounds Science F.Y.I. Used to regulate the seconds in atomic clocks F.Y.I. Used for creating electricity from light in photoelectric cells/solar panels

7. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound NaCl (Sodium Chloride) Why?... Has 2 different types of atoms bonded together How to tell?...It has more than one capital letter! Compound Review Activity SPI 0807.9.3 Elements and Compounds Science F.Y.I. This is the substance that you sprinkle on your French Fries F.Y.I. This compound is commonly called TABLE SALT

8. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound Fe (Iron) Why?...is a pure substance, consists of only one type of atom How to tell?...It only has one capital letter! Element Review Activity SPI 0807.9.3 Elements and Compounds Science F.Y.I. 6000 years ago: tools and weapons were first made out of iron. F.Y.I. 4000 years ago: people mixed iron & carbon to create steel.

9. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound MgCl 2 (Magnesium Chloride) Why?... has 2 different types of atoms bonded together How to tell?...It has more than one capital letter! Compound Review Activity SPI 0807.9.3 Elements and Compounds Science F.Y.I. Used for dust control on dirt roads and to reduce wind erosion of soil. F.Y.I. Use for de-icing roads, sidewalks, driveways and parking lots.

10. Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI 0807.9.3 Elements and Compounds

11. Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI 0807.9.3 Elements and Compounds

12. Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI 0807.9.3 Elements and Compounds

13. Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI 0807.9.3 Elements and Compounds

14. Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI 0807.9.3 Elements and Compounds