Elements & compounds the differences
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The document describes an experiment to differentiate between elements and compounds. Students are provided sulfur powder, white sugar, iron fillings, alcohol lamps, test tubes, and a magnet. They observe and record the properties of each substance before and after heating in a test tube. Sulfur and sugar are heated to see if they change, while iron filings are tested with a magnet. The results are used to determine whether each substance is an element or compound based on whether it can be broken down through chemical means.
Elements & compounds the differences
- 1. Activity No. _____ ELEMENTS AND COMPOUNDS: THE DIFFERENCES An element is a pure substance which cannot be broken down by further chemical techniques. A sample of an element contains only one kind of atom in the sample. A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two. The key distinction is that compounds break down whereas the SAME techniques do not cause an element to break down. I. PROBLEM How will you differentiate elements from compound? II. MATERIALS • 3 g sulfur powder • 3 g white sugar • 1 alcohol lamp • Iron fillings III. PROCEDURE 1. Put 3 g sulfur into the test tube. Observe its properties. Record your observations. 2. Set aside the test tube with sulfur into the test tube rack. 3. Put 3 g white sugar into the other test tube. Observe its properties. Record your observations. 4. Set aside the test tube with sugar into the test rack. 5. Using a test tube holder, heat the test tube with sulfur for 5 minutes. Observe and record findings. 6. Secure the test tube with sulfur into the test tube rack. 7. Repeat step numbers 5 & 6 using sugar instead of sulfur powder. 8. Bring the magnet near the iron fillings. Observe what happens. 9. Repeat steps 5 & 6 using iron fillings. • 2 test tubes • 1 test tube holder • 1 test tube rack • magnet
- 2. IV. DATA AND OBSERVATIONS MATERIALS OBSERVATIONS Is the material element or compound? Before Heating After Heating White Sugar Sulfur Powder Iron fillings V. COMPREHENSION CHECK 1. Which of the materials has changed/not changed during heating? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 2. Which of these materials is an/a element or compound? Explain. _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 3. How is an element distinguished from a compound? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ VI. CONCLUSION ____________________________________________________________________ ____________________________________________________________________ ______________________________________________________________ VII. APPLICATION 1. Tell whether the material is an element or compound. Write your answer before each number. _______________ 1. oxygen ______________ 6. water _______________ 2. carbon monoxide ______________ 7. salt _______________ 3. sugar ______________ 8. sodium _______________ 4. lead ______________ 9. limewater _______________ 5. iron ______________10. sulfuric acid
- 3. EXERCISES A. TRUE OR FALSE: Write TRUE if the statement is correct. If the statement is false, changed the underlined word/s to make it true. ______ 1. Elements are the simplest form of pure substance. ______ 2. A molecule is a pure substance made from a chemical combination of at least two different elements. ______ 3. When heat is applied to an element in the absence of another substance a new substance is formed. B. ORGANIZE YOUR THOUGHTS: Fill in the Venn diagram based on the idea given. ELEMENTS Properties of elements and compounds S I M I L A R T I E S COMPOUNDS
- 4. C. Complete the table below. DEFINITION/DESCRIPTIO N EXAMPLES Element 1. 2. 3. 4. 5. Compound 1. 2. 3. 4. 5. D. Short – Response 1. Why do we consider air as a mixture and not a compound? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 2. How is element differ from a compound? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 3. Why are elements pure substances? ELEMENTS D I F F E R E N C E S COMPOUNDS
- 5. _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ E. In your own words…… and with your own hands Write the importance of some common element and compounds like oxygen, carbon dioxide and water to life. Write your answer on the table below. COMMON ELEMENTS & COMPOUNDS IMPORTANCE Oxygen Carbon dioxide Water
- 6. EXPECTED ANSWERS (Metals and Nonmetals) A. True or false 1. true 2. compound 3. no new substance B. Similarities of element and compound Has same properties throughout Differences of elements and compound Elements Compounds 1. Made up of only one kind of atom 2. Cannot be broken down by chemical means 3. Has same properties as atoms making it up 1. Made up of more than one kind of atom 2. Can be broken down by chemical means 3. Has different properties from elements making it up C. Completing the table DEFINITION/DESCRIPTIO N EXAMPLES Element Elements are the simplest type of pure substances which cannot be broken down in simpler substances without losing their identity. 1. oxygen 2. sodium 3. helium 4. mercury 5. gold (it may vary) Compound Compounds are two or more elements chemically combined which can be broken down into simpler substances. 1. carbon dioxide 2. water 3. table salt 4. hydrochloric acid 5. sodium monoxide (it may vary) D. Short response 1. Air is a mixture because it can be physically separated into several components and it has a varying composition according to location. 2. Element is made up only of one kind of atom which cannot be broken down by chemical means while compound is made up of more than one kind of atom which can be broken down by chemical means. 3. Elements are pure substance because it is made only of one kind of material and has definite properties. The particles making up an element are in their simplest form.
- 7. Prepared by: Ms. AGNES G. ARGUILLES SST – I Naujan Municipal HS-Or. Mdo.