Crude oil DNA Rearrange the words to work
- Slides: 14
Crude oil DNA – Rearrange the words to work out 3 key facts about today’s lesson. Sentence 1 a –Crude crude –oil is–isoil – mixture a mixture Sentence 2 hydrocarbons – oil – contains – crude Crude oil contains hydrocarbons Sentence 3 from – are – madeare – only –hydrogen – carbon –hydrocarbons –and Hydrocarbons made from only hydrogen and carbon Challenge- can you write the chemical formula for any hydrocarbon in the picture?
Progress indicators Good progress: • Describe the structure of the first four hydrocarbons • Calculate the formula of an unknown alkane using a general formula Outstanding progress: • Justify the classification of a compound as an alkane
Word consciousness Hydrocarbon - Compound made from only carbon and hydrogen atom Saturated – Hydrocarbons which contain all single bonds
Activity 1: Describe the structure of the first four hydrocarbons Complete the worksheet by moving around the classroom and collecting information from each other Once you have completed your tables, answer the questions on the bottom of your sheet
Self-asses Alkane name Number of Carbon atoms Molecular formula Methane 1 CH 4 Ethane 2 C 2 H 6 Propane 3 C 3 H 8 Butane 4 C 4 H 10 Structural formula
Swap and peer-assess What type of bond is represent by the line between the atoms? (remember carbon and hydrogen are both nonmetals) COVALENT _______ bond 4 How many bonds does each carbon atom form? _______ 1 How many bonds does each hydrogen atom form? ______ Can you state the molecular formula and draw the structural formula of pentane (5 carbons)? C 5 H 12
What do alkanes have to do with monkeys? • Monkeys • Eat • Peeled • Bananas • Methane • Ethane • Propane • Butane A phrase to help remember the name of the first four alkanes
Activity 2: Calculate the formula of an alkane Watch the video and note the following: 1. Define a saturated hydrocarbon 2. What is another name for saturated hydrocarbons? 3. What is the general Challenge: How would you write formula of an the formula of hexane (6 carbons)? alkane?
Activity 2: Calculate the formula of an alkane 1. Define a saturated hydrocarbon Hydrocarbons where the carbon atoms are connected by only single bonds 2. What is another name for saturated hydrocarbons? Alkane 3. What is the general formula of an alkane? Cn. H 2 n+2 where n= number of carbon atoms
Activity 3: Calculate the formula of an unknown alkane using a general formula Every alkane has the formula Cn. H 2 n+2 (n= number of carbon atoms) Calculate the formula of the following alkanes: 1. An alkane with 8 carbon atoms C 8 H 18 2. An alkane with 15 carbon atoms C 15 H 32 3. An alkane where n = 20 C 20 H 42 4. An alkanes where n = 25 C 25 H 52 5. An alkane with 20 hydrogen atoms C 9 H 20 Extension: Draw the structural formula for the alkanes in 1 -3
Activity 3: Justify the classification of a compound as an alkane 1. 2. Task: Pick three structural formulas from the four shown opposite and justify why it is or is not classed as an alkane 3. 4. Hint- Remember the definition of an alkane!
Activity 4: Exam practice • Complete the past paper question based on today’s lesson
PLENARY - These are five answers from the lesson, what were the questions? 1. Carbon and hydrogen 2. Alkane 3. Ethane 4. Cn. H 2 n+2 5. C 15 H 32
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