Chemical Changes Word equations. Chemical reactions – What to look for There may be a change of...
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Transcript of Chemical Changes Word equations. Chemical reactions – What to look for There may be a change of...
![Page 1: Chemical Changes Word equations. Chemical reactions – What to look for There may be a change of colour.](https://reader035.fdocuments.in/reader035/viewer/2022070402/56649f275503460f94c3ec28/html5/thumbnails/1.jpg)
Chemical Changes Word equations
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Chemical reactions – What to look for
• There may be a change of colour
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Chemical reactions – What to look for
• There may be a gas given off (bubbles)
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Chemical reactions – What to look for
• There may be an energy change (gets hotter or colder)
![Page 5: Chemical Changes Word equations. Chemical reactions – What to look for There may be a change of colour.](https://reader035.fdocuments.in/reader035/viewer/2022070402/56649f275503460f94c3ec28/html5/thumbnails/5.jpg)
Chemical reactions – What to look for
• New substances are formed, and the change is usually difficult to reverse
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Learning for today
1) Know the meanings of the words reactant, product and word equation
2) Be able to write word equations for chemical reactions
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Physical?
OR
Chemical?
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Physical or chemical – how can we tell?
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Part 1 – Reactants and ProductsIf we made a cake we would start with the ingredients,
mix and cook them to give us a finished cake
The ingredients are the reactants, and the finished cake is the product.
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Activity
Task:
1) Copy the table
2) Think of some
examples from the last
lesson, and from your
book, of reactants and
products
3) Fill in your table
Experiment Reactants Products
Baking a Cake
In a chemical reaction we start with one set of chemicals called
the reactants, a reaction happens and we end up with another
set, called the products.
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Part 2 - Word Equations
To show what is happening during a chemical reaction we can write a word equation
Eggs + flour + milk + butter Cake
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Word Equations
For this reaction the word equation is
Eggs + flour + milk + butter Cake
Copy this downWe use word equations to show what is happening in a chemical reaction. The reactants go on the left side and the products on the right. We use an arrow not an equals sign (=). The arrow means “reacts to form”
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Your Turn…
When methane is burned in oxygen it
produces a gas, carbon dioxide and water.
1) What are the reactants?2) What the products?3) What is the word equation?
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Your Turn…
When methane is burned in oxygen it
produces a gas, carbon dioxide and water.
1) What are the reactants?2) What the products?3) What is the word equation?
Methane + oxygen carbon dioxide + water
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Task
Using the work card, work out what are the
reactants and products then complete the
word equations for the chemical reactions
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How have you done?
1) Define and give examples of the words reactant and product and word equation
2) Give an example of a word equation for a chemical reaction that we did last lesson.