Section B—Short answer (43 marks) a physical Classify the following as physical or chemical properties. b physical c chemical a Water is liquid at 25oC. chemical d b Copper sulfate is blue. e chemical c Copper corrodes to form a green substance. f physical d Petrol can explode in oxygen. e Nitric acid burns skin. f Helium gas is lighter than air. 6 a Bread roll: biodegradable. In your lunch, you have a bread roll Ham: biodegradable. filled with ham (wrapped in cling Cling wrap: non-biodegradable. wrap), an apple and a small plastic Apple: biodegradable. bottle of milk. Plastic bottle: non-biodegradable. Classify each of the substances in a Milk: biodegradable your lunch as biodegradable or b All biodegradable substances will non-biodegradable. eventually, decompose and ‘go off’. b Justify each of your answers. All non-biodegradable substances will not decompose. 8 A pile of autumn leaves eventually Bacteria and fungi. breaks down. Name two types of living things that help them do this. 2 a 0oC State the temperatures of the following: b 0oC a melting point of ice c 100oC b freezing point of water d –273oC c boiling point of water absolute zero d 4 A gas The three beakers below each show a different state of matter. Identify what B solid state each one is. C liquid 3
Section B—Short answer (43 marks) Classify the following as physical or chemical properties. a Water is liquid at 25oC. b Copper sulfate is blue. c Copper corrodes to form a green substance. d Petrol can explode in oxygen. e Nitric acid burns skin. f Helium gas is lighter than air. a physical b physical c chemical d chemical e chemical f physical 6 In your lunch, you have a bread roll filled with ham (wrapped in cling wrap), an apple and a small plastic bottle of milk. a Classify each of the substances in your lunch as biodegradable or non-biodegradable. b Justify each of your answers. a Bread roll: biodegradable. Ham: biodegradable. Cling wrap: non-biodegradable. Apple: biodegradable. Plastic bottle: non-biodegradable. Milk: biodegradable b All biodegradable substances will eventually, decompose and ‘go off’. All non-biodegradable substances will not decompose. 8 A pile of autumn leaves eventually breaks down. Name two types of living things that help them do this. Bacteria and fungi. 2 State the temperatures of the following: a melting point of ice b freezing point of water c boiling point of water d absolute zero a 0oC b 0oC c 100oC d –273oC 4 The three beakers below each show a different state of matter. Identify what state each one is. A gas B solid C liquid 3
PS72e_eBk_Test_Ch02.docx