Y8 Science Chemistry Chemical Reactions.

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Presentation transcript:

Y8 Science Chemistry Chemical Reactions

Understanding Chemical changes involve substances reacting to form new substances. Elaboration What is the difference between chemical and physical change? What evidence shows a chemical change? Investigate different types of reactions. Recognise chemical properties of a substance.

What are Physical Changes? No chemical bonds are broken. No new bonds are formed. No new substance is made. They are more easily reversed What are Chemical Changes? Bonds between atoms are broken. Bonds are reformed. New substances form. They have different properties.

Questions to think about. Why does an apple go brown? Why are explosions different? Why does powdered sugar dissolve more quickly than cubes? What makes a nail rust? Why do they keep painting bridges?

What are Chemical Reactions ?

Bonds are broken and reformed.

Types of Reactions

http://www.youtube.com/watch?v=UZ849ea1Byk

Double displacement reactions. http://www.youtube.com/watch?v=z_WkD_TVENE http://www.youtube.com/watch?v=eGG3EI4mwok

Combination http://www.youtube.com/watch?v=A5H6DVe5FAI

http://www. youtube. com/watch. v=1a4kQCP4oi8 http://www. youtube http://www.youtube.com/watch?v=1a4kQCP4oi8 http://www.youtube.com/watch?v=4N0m95PExHY&feature=related Here is another

Combustion http://www.youtube.com/watch?v=UygUcMkRy_c&feature=fvst

Rusting http://www.youtube.com/watch?v=cDQLscEIa_M&feature=related

You have some experiments to do. 8.1 p 265 Checking properties. 8.2 p266 a burning candle. 8.3 p269 Burning Magnesium. 8.4 p269 Heating copper carbonate. 8.5 p269 Sodium sulphate and barium chloride. 8.6 p269 Steel wool in copper sulphate solution. 8.7 p272 The effect of heat on a reaction. 8.8 p273 Changing the rate of a reaction. 8.9 p274 Observing Rust. 8.10 p275 Investigating the corrosion of different matals. 8.11 p276 Rusting in salt water. 8.12 p278 Burning Magnesium. 8.13 p278 Burning Paper.

You have some questions to answer from the text book. 8.1 p265 Rem think 8.2 p267 Rem think 8.3 p270 Rem think 8.4 p273 Rem think 8.5 p276 Rem think 8.6 p278 Rem think