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Reactions2010
- 2. Chemical Reactions January 28, 2010
- 4. Molecules and Compounds Some elements exist as individual atoms. Molecules consist of two or more elements joined together. If more than one type of atom is in a molecule, we call it a compound .
- 5. Chemical Reactions Chemical reactions happen when the atoms in one or more molecules split up and join together in new ways. For example, hydrogen can react with oxygen :
- 10. 4 Types of Reactions Synthesis Decomposition Single Replacement Double Replacement
- 12. Synthesis Means to put together or combine occur when two substances (generally elements ) combine and form a compound. In general: A + B AB Fe + S FeS reactant + reactant 1 product
- 13. Decomposition In this type of reaction, a substance breaks down into simpler parts when it is heated. 1 Reactant Product + Product In general: AB A + B CuCO 3 heat Cu 2 O + CO 2 For example, copper carbonate will decompose when heated :
- 15. Double Replacement Occurs when one metal trades places with another one. AgNO 3 + KCl AgCl + KNO 3 Compound + compound product + product In general: AB + CD AD + CB
Notas do Editor
- We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green. We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green.
- We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green. We see the red / brown copper metal start to appear in place of the grey iron, and the solution changes colour from blue to green, as copper sulphate is blue but iron sulphate is green.