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Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place?

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Presentation on theme: "Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place?"— Presentation transcript:

1 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place?

2 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Chemical Reactions Involve a change in the chemical composition of substances Something new has been formed so it is not possible to get back the original substances. For example, can you take an egg that is cooked, and turn it back to a raw egg?

3 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Chemical Reactions Chemical equations are used to show what happens to the elements during a chemical reaction CH 3 COOH + NaHCO 3 H 2 O + NaOCOCH 3 + CO 2 Reactants YieldProducts Vinegar Baking Soda Water Carbon Dioxide Sodium Acetate

4 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 1.) Gas bubbles For example: Baking soda and vinegar

5 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 2.) Temperature change

6 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 3.) Odor (smell) is produced For example: When food goes bad, it produces a smell

7 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 4.) A change in color

8 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 5.) A precipitate (solid) is formed

9 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 6.) Heat is produced

10 Now take some time… Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything:

11 Time to use the left hand column You will now write your own questions using the question starters provided.

12 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Chemical Reactions Involve a change in chemical composition in substances It is not possible to get back your original substances as something new has been formed. For example: can you take an egg that is cooked, and turn it back to a raw egg? Write a question using one of these question starters: How would you explain…? What is…?

13 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Chemical Reactions Chemical equations are used to show what happens to the elements during a chemical reaction CH 3 COOH + NaHCO 3 H 2 O + NaOCOCH 3 + CO 2 Vinegar Baking Soda Water Carbon Dioxide Sodium Acetate Write a question using one of these question starters: How is…? What is…?

14 Topic: Chemical Reactions Essential Question: What pieces of evidence indicate a chemical reaction has taken place? Evidence a chemical change has occurred 1.) Gas bubbles 2.) Temperature change 3.) Odor produced 4.) Color change 5.) Precipitate (solid) is formed 6.) Heat is produced Write a question using one of these question starters: How do you know…? List the…?

15 Now let’s write a summary Look at each question you wrote on your own, and answer each question in a complete sentence.


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