Presentation on theme: "Objective: Tell the difference between a physical and a chemical change Warm-up: What is the difference between a physical & chemical change?"— Presentation transcript:
1 Objective: Tell the difference between a physical and a chemical change Warm-up: What is the difference between a physical & chemical change?
2 Tell the BASIC idea/definition for the following. What is a physical change:What is a chemical change:A change in appearance only that does NOT make a new substance.A change that causes a new substance to be formed, must have at least one indicator.
3 LAB: Changes in a Burning Candle First read through ALL of the proceduresPrepare materials-- Put 150-ml cold water into a beakerPerform experiment and record dataAnswer “Analyze and Conclude” questions
5 Changes in a Burning Candle 1. Physical Changes:2. Chemical Changes:Wax meltedwater turned to steamwater heatedcandle got smallerwick burningsoot createdsmoke createdcarbon dioxide created3. What else is needed for combustion besides fuel?Oxygen – Proof is the flame went out when we took oxygen away by putting a flask over the candle.4. What are the 2 chemical products of combustion??Carbon Dioxide – in the smokeCarbon – soot on beaker1. Why was the water needed?To seal out air