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What are the properties of covalent substances? TITLE: Properties of covalent substances (A-B grade) Describe the properties of typical simple molecular, covalent compounds, limited to: a low melting points and boiling points, in terms of weak forces between molecules b poor conduction of electricity  (B-C grade) Recall basic information about simple and giant covalent compounds

Properties of covalent substances Learning objectives for this question Describe the properties of typical simple molecular, covalent compounds, limited to: a) low melting points and boiling points, in terms of weak forces between molecules b) poor conduction of electricity 3.6 Demonstrate an understanding of the differences between the properties of simple molecular, covalent substances and those of giant molecular, covalent substances, including diamond and Graphite 3.7 Explain why, although they are both forms of carbon and giant molecular substances, graphite is used to make electrodes and as a lubricant, whereas diamond is used in cutting tools This is a key word! Describe questions want you to give details. Success criteria Read information about covalent substances and complete summary table to form a note on this topic. Use summary table to complete questions to show what you have learned about covalent substances. Success criteria Stick in diagrams of different covalent substances to show the difference in bonding/forces Success criteria Write a summary about the properties of diamond and graphite. List the similarities and differences using summary guides and textbooks to help you.

Task 1 Use the information cards to help you complete your summary table about simple and giant molecular covalent substances. Collect diagrams to show each type of molecular substance and label them as either a simple molecular covalent substance or a giant molecular covalent substances B-C grade give basic answers to complete table A grade give full answers with examples or explanations to complete table End 12 minutes

Task 2 Collect a question sheet and answer all 6 questions, using your completed table to help you. Peer assess each other’s answers and give them verbal feedback to help them better understand questions that they were not successful on first time. Higher extension work *(c) Methane is a gas at room temperature. It exists as molecules, CH4. Methane has a low boiling point. It does not conduct electricity. Explain, in terms of the nature of its molecules and the forces between its molecules, why methane has a low boiling point and does not conduct electricity.(6) B-C grade give basic answers to questions. May not do question 6 A grade give full answers with examples or explanations to questions, including question 6 End 12 minutes

Task 2 Answers List three compounds that are simple molecular covalent substances Any 3 of: water, carbon dioxide, oxygen, methane, hydrogen Why do most simple molecular covalent substances have low melting and boiling points? There are only weak forces between neighbouring molecules Why don’t simple molecular covalent substances conduct electricity? These molecules have not lost or gained electrons, so there is no charged particles to move around Name the three giant molecular covalent substances Sand (silica) diamond and graphite Compare the melting and boiling points of giant molecular structures to simple molecular covalent substances Giant molecular structures have a higher melting and boiling point than simple molecular covalent substances Explain why the melting points are different. (A/B level question) The melting and boiling point of giant covalent molecular substances are higher because the bonds that hold atoms in these molecules together are strong covalent bonds. In simple molecular structures, there are only weak forces that hold molecules together.

Mini Plenary Methane is a giant molecular covalent substance True False

Weak forces between molecules are found in simple molecular covalent substances True False

Mini Plenary Giant molecular covalent substances are held together by strong covalent bonds True False

Covalent substances are good conductors of electricty True False

What are the properties of covalent substances? TITLE: Properties of covalent substances (A-B grade) Describe the properties of typical simple molecular, covalent compounds, limited to: a low melting points and boiling points, in terms of weak forces between molecules b poor conduction of electricity  (B-C grade) Recall basic information about simple and giant covalent compounds

Properties of covalent substances Learning objectives for this question Describe the properties of typical simple molecular, covalent compounds, limited to: a) low melting points and boiling points, in terms of weak forces between molecules b) poor conduction of electricity 3.6 Demonstrate an understanding of the differences between the properties of simple molecular, covalent substances and those of giant molecular, covalent substances, including diamond and Graphite 3.7 Explain why, although they are both forms of carbon and giant molecular substances, graphite is used to make electrodes and as a lubricant, whereas diamond is used in cutting tools This is a key word! Describe questions want you to give details.

Task 3 Diamond and Graphite A grade task: Collect a textbook and read about diamond and graphite on page 143 (or page 54 in summary guide). Make a summary note about the differences and similarities between diamond and graphite. B-C grade task: Collect the revision book and read about diamond and graphite on page 56 Write a summary note about these two giant molecular covalent substances. B-C grade be able to state the diamond and graphite are made from the same atoms and give basic details about both compounds A grade give differences and similarities between these two compounds

Task 4 Construct a mind map to summarise what you have learned about covalent bonds in the last two lessons. You should include the following information: – Definition of covalent bonding – Facts about simple molecular covalent substances – Facts about giant molecular covalent substances – Differences between diamond and graphite, even though they are both made of carbon B-C grade give basic answers to questions. May not do question 6 A grade give full answers with examples or explanations to questions, including question 6 End 20 minutes