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Bell Work Apr 14, 2015 Instructions: On your paper, do the following… 1) Select the best answer (just write letter A or B) 2) Explain what is wrong with.

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Presentation on theme: "Bell Work Apr 14, 2015 Instructions: On your paper, do the following… 1) Select the best answer (just write letter A or B) 2) Explain what is wrong with."— Presentation transcript:

1 Bell Work Apr 14, 2015 Instructions: On your paper, do the following… 1) Select the best answer (just write letter A or B) 2) Explain what is wrong with the other one (complete sentences) 3) Select the best answer (just write letter A or B) 4) Explain what is wrong with the other one (complete sentences SPI 0807.9.3 Elements and Compounds

2 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 The element hydrogen The element sodium The element calcium  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  Elements are pure substances which can not be broken down by chemical means  Also… elements are the different types of atoms

3 Sodium and Chlorine Carbon and Oxygen Carbon, Hydrogen, & Oxygen Notes SPI 0807.9.3 Elements and Compounds Science NaCl CO 2 C 6 H 12 O 6 (Sodium Chloride (Carbon Dioxide) (Glucose) What Is a Compound? AA compound consists of two or more different elements that are chemically bonded via a chemical reaction to form a new substance.  The properties of the new substance are different from the substances that you started with. Examples of Compounds

4 …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! What Is a Compound?  A compound consists of two or more different elements that are bonded via a chemical reaction to form a new substance.

5 Bell Work Science SPI 0807.9.3 Elements and Compounds Answers

6 Bell Work Science  Explain what is wrong with these answers. (Call on several students to share their explanations) SPI 0807.9.3 Elements and Compounds Wrong Answers

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