{"id":1047,"date":"2019-02-17T07:27:53","date_gmt":"2019-02-17T07:27:53","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/?page_id=1047"},"modified":"2019-09-09T09:22:07","modified_gmt":"2019-09-09T09:22:07","slug":"marking-guide-unit-3g1-bond-enthalpy","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/marking-guide-unit-3g1-bond-enthalpy\/","title":{"rendered":"MARKING GUIDE: Unit 3G1 \u2013 Bond Enthalpy"},"content":{"rendered":"<p>&nbsp;<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"50\">1.<\/td>\n<td>B<\/td>\n<td width=\"5\"><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>2.<\/td>\n<td>\u00a0D<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>3.<\/td>\n<td>\u00a0A<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>4.<\/td>\n<td>\u00a0B<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>5.<\/td>\n<td>\u00a0B<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>6.<\/td>\n<td>\u00a0D<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>7.<\/td>\n<td>\u00a0C<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>8.<\/td>\n<td>\u00a0C<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>9.<\/td>\n<td>\u00a0A<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>10.<\/td>\n<td>\u00a0B<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"50\">11.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0<img decoding=\"async\" class=\"alignleft wp-image-1266\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture5-1.png\" alt=\"\" width=\"953\" height=\"503\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture5-1.png 995w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture5-1-300x158.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=fe799d3b6b62e5c619772f244b09777588f53e5614ed824459b789517d8619d3 300w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture5-1-768x404.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=7024e0ef60c21ecdf3ac55955bd1ff61de9dba6cc2aa472a9646d24a4f352ebb 768w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/td>\n<\/tr>\n<tr>\n<td>12.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0<img decoding=\"async\" class=\"alignleft wp-image-1268\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture6-2.png\" alt=\"\" width=\"929\" height=\"823\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture6-2.png 1092w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture6-2-300x266.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=04eb20feef01b2632936f559139b0d9b9f3e4e57d3b714f6b4057c17144825a1 300w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture6-2-768x680.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=9ccfde9714124d8efe91671a0755646dde3728cd4823ca62fa5ab3a7fd6237a2 768w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture6-2-1024x907.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=9db5f459f0f28326be369e9dd2cd1bb8e253877fb929095267211cb1e177ba2f 1024w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/td>\n<\/tr>\n<tr>\n<td>\u00a013.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0B<\/td>\n<\/tr>\n<tr>\n<td>\u00a014.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0<img decoding=\"async\" class=\"alignleft wp-image-1328\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture1-6.png\" alt=\"\" width=\"870\" height=\"384\" srcset=\"https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture1-6-300x132.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=c03d4b34d3e82b111f38e1949f3eacc598f946a971b4130981a1baea443cc5c8 300w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture1-6-768x338.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=3550c9d6211cc017e43e12d8bb295b024d4bd1739a5758f2d98815608db28485 768w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/td>\n<\/tr>\n<tr>\n<td>\u00a015.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0<img decoding=\"async\" class=\"alignleft wp-image-1329\" src=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture2-5.png\" alt=\"\" width=\"904\" height=\"438\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture2-5.png 999w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture2-5-300x145.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=31e569d0df4a22c6932b0e981c3a1be0fceac864059a6a12cefe2df55ae822bf 300w, https:\/\/glow-prod-gc.s3.eu-west-1.amazonaws.com\/gc\/public\/hchemanswers\/uploads\/sites\/5342\/2019\/03\/Picture2-5-768x371.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEFcaCWV1LXdlc3QtMSJHMEUCIQCZ2UlFQ2Jw0kb%2BDjxB87VfmGtLKw%2FEzZisIKIbNVDOSQIgc1vihgYcY%2FjmFBQN%2FOCbmqoIgT59zTSYAdvjuFjKjp8quQUIIBAFGgwyNzM1NzAxOTU0MzMiDBAJmvTH3TllC31pzCqWBZZL3Ns5fs%2BhOAWvA3KH7phkTekdfLVcw%2FIo6RILNuA6hw2%2F262qsT0mJlNU4CEMTicxYtyqMLyFt3kJxHR7qPqnTDAGTp1zcnyLSNLmNMt1IKt4qQrByxl1%2FgvzGzEzCO0JwsFOVAxUUz3tAvuUg6sOLXpBrgoHUy3O%2BUKIVISt6vEQ0tODi5IxWJE%2FkEeQX9N%2Bo0JqTn2LT%2F3At8dPqJ1rZG%2BapN9Hwt5Pp94VJlteITdMLxoA6mmQ6yKWzT%2BnvxFtUJdMijjfNv5ebo%2FIADyaXejECJHBmeqSVMuKnxqf6ppl21xGpsdh%2FR%2BgT6phKVFzmLi0dt3dFI0Y9KRV0B0Tz%2FSwKhvrPsgJA%2FBQE6CfO6z54udLuHG1YPgXjJwMHWJ2ZSbVzPJBBMZkxbqaJuIqi63XLyX5YhCfea8p1TVUCH%2BX%2BKHXiSQ939AxhuM0R%2Bj2VSpRwpDZ5cV1ImuPTNmgFJZmIq%2FJxE8Mm5MKEEWeaX59vpPZ7%2BVQNkuKeJ6WDx%2B38hshQhj9CHtUBbUeeJn1EedeCBXlRFSuN7%2Felkk66nMszvCxvO2LWqWxvHTyuLpMe4bICliR%2FKPjIrqmkxYKnRJNO2OtGTxItz4ecgXdYvDiLu9eFz1rVS%2Fokh8eGBwoYw%2BgUJmwMnQL%2BJKaGMt9rAnEhTJRoZUroIwFEJ54ljgabhh%2FMQk7zzi7Bu5Uf3%2FNbbhMABv1siFQ5e2GJWVgX1ZyWlGkdkLS1C7sKgTEZvOni5PsjncuKIfDc3Yo6uUcXnBr6CESbCIHh4znBZIDljIHg%2FbA9zLbCedX5eNgqA6Zpp91Szri700SwOParkPBZ8DdT%2B5RgJK6O2S3eQ8OH9AeGH9cbvrEE%2FOs27H4v0ux0WBoMISxy9MGOrEBg37l%2FuuI%2BxJmRqzQFZZNDsotZ5UH0AnAJPJ9gszWMXsroAJiKJDxL5Hqhsy9VC5V4n2zKu1Xvin8i0rQOnMrHHuyWMdpjxxSLFNbBgglDWPANbKYQvq9ze0shcG%2FFFAg%2FF3Jh9R%2Bxnj43r2lMntKpIu9wzdsWWqEnRyfdfr5wOP94lnMnPhfk607uFD3QDswE1%2BXBdXb%2FTASrAcRzqqjtqNTW2JzrgCD9DCfRzvb3iGE&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47U7IPMDP4Z%2F20260805%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260805T065435Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=95bd4d8561c2e651c08e2a652937a8a5216cf6b36ab2697bf7d2fb852a04b9aa 768w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/td>\n<\/tr>\n<tr>\n<td>\u00a016.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0Mean bond enthalpy is the average\u00a0<a href=\"https:\/\/www.thoughtco.com\/definition-of-enthalpy-change-605090\">enthalpy change<\/a>\u00a0when one\u00a0<a href=\"https:\/\/www.thoughtco.com\/mole-definition-in-chemistry-606377\">mole<\/a>\u00a0of\u00a0<a href=\"https:\/\/www.thoughtco.com\/definition-of-bonds-in-chemistry-604392\">bonds<\/a>\u00a0are broken.<\/td>\n<\/tr>\n<tr>\n<td>\u00a017.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>a)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0i)<\/td>\n<td>\u00a0\u00a0\u00a0Hydration<\/td>\n<\/tr>\n<tr>\n<td>\u00a0ii)<\/td>\n<td>\u00a0-45 kj mol<sup>-1<\/sup><\/td>\n<\/tr>\n<tr>\n<td>\u00a018.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\u00a0-8 kj mol<sup>-1<\/sup><\/td>\n<\/tr>\n<tr>\n<td>\u00a019.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0b)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0i)<\/td>\n<td>\u00a0Enthalpy of formation.<\/td>\n<\/tr>\n<tr>\n<td>\u00a0ii)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>20.<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0a)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0b)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0c)<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; 1. B 2. \u00a0D 3. \u00a0A 4. \u00a0B 5. \u00a0B 6. \u00a0D 7. \u00a0C 8. \u00a0C 9. \u00a0A 10. \u00a0B &nbsp; &nbsp; 11. \u00a0 12. \u00a0 \u00a013. \u00a0B \u00a014. \u00a0 \u00a015. \u00a0 \u00a016. \u00a0Mean bond enthalpy is the average\u00a0enthalpy change\u00a0when one\u00a0mole\u00a0of\u00a0bonds\u00a0are broken. \u00a017. a) \u00a0i) \u00a0\u00a0\u00a0Hydration \u00a0ii) \u00a0-45 kj mol-1 \u00a018. \u00a0-8 kj mol-1 &hellip; <a href=\"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/marking-guide-unit-3g1-bond-enthalpy\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;MARKING GUIDE: Unit 3G1 \u2013 Bond Enthalpy&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1047","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/pages\/1047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/comments?post=1047"}],"version-history":[{"count":16,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/pages\/1047\/revisions"}],"predecessor-version":[{"id":1537,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/pages\/1047\/revisions\/1537"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hchemanswers\/wp-json\/wp\/v2\/media?parent=1047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}