Chemical Changes Lesson 1 What is a chemical reaction?

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Presentation transcript:

Chemical Changes Lesson 1 What is a chemical reaction? Learning Objectives 04 December 2018 Chemical Changes Lesson 1 What is a chemical reaction? Learning Intentions Define “chemical reaction” Give examples of everyday chemical reactions How do we know when a chemical reaction has taken place? Key Words – State Reactants Products 5 Minute Task

What is a chemical reaction? Think, pair, share Think quietly then discuss with your neighbour what you think a chemical reaction is. Be prepared to share your answer Class Ideas

Why do we have these guidelines do you think? Copy this down! “ a chemical reaction occurs when two or more chemicals join together to form a new substance” Why do we have these guidelines do you think?

Everyday Chemical Reactions Think, pair, share Can you think of any chemical reactions that you have come across in your everyday life? Be prepared to share your answer Class ideas

Why do we have safety guidelines? Experiment Title: Investigating Chemical Reactions Aim: To find out how we know a chemical reaction has taken place Method: See work cards Results: Write a sentence explaining what happened in each experiment. We added and . Our evidence that a chemical reaction took place is: . The new chemicals produced were Why do we have safety guidelines?

Results Experiment Observations Experiment 1 Sodium Hydroxide + Hydrochloric Acid Experiment 2 Sodium Bicarbonate Acetic Acid Experiment 3 Silver nitrate Sodium chloride

Conclusion If you add two ________ together sometimes you get a chemical reaction. This is when a ___ ________ is made. It is very difficult to ______ the reaction and get the ______ substances back. Signs that a chemical reaction has taken place include ___________________________ _______________________________________

How did it go? Define “chemical reaction” Give examples of everyday chemical reactions How do we know when a chemical reaction has taken place?

    x x  x x  x x x   Adding acid to alkali Fireworks Driving a car    Ice cream melting Boiling the kettle frying an egg  x x Dissolving sugar in tea Burning a candle Melting candle wax  x x Lighting a match Making ice cubes Ironing clothes  x x Printing Baking a cake Launching a space rocket x  