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• NCEA on TKI
• NZQA website

Chemistry 1.5 Demonstrate understanding of aspects of chemical reactions

Subject content

• The actual reactions you will carry out in class will be decided by your teacher but will include all four types: combination, precipitation, displacement and decomposition and all four types will be examined
• You will need to be able to classify a reaction as one of these 4 types and to explain how you did this
• You will need to know the names and symbols/formulae of the elements you use, especially the common metals plus  the non-metals carbon, oxygen, sulfur, nitrogen and chlorine.
• You need to be able to predict the formation of a precipitate and identify the spectator ions using solubility rules These are limited to the formation of:
• chlorides and iodides of silver and lead
• sulfates of calcium, barium and lead
• hydroxides of copper, iron(II), iron(III), calcium, barium and magnesium
• carbonates of copper, iron(II), calcium, barium, magnesium, zinc, and lead ions.

• And also how to use an activity series of metals to predict the products in displacement reactions
• You must be able to predict products formed in combination reactions such as those between metals and oxygen, sulfur and chlorine, and between two non-metals such as carbon, sulfur and nitrogen with oxygen
• And also how to predict the products formed when carbonate and hydrogen carbonate compounds decompose
• You need to learn the products and some possible catalysts for the catalytic decomposition of hydrogen peroxide.
• General observations  are expected for each of the above types of reactions you need to be able to use these observations to explain how you classify a reaction
• You may be required to compare and contrast the 4 types of reactions and to elaborate on the nature of the substances formed from each type
• You need to be able to write word and balanced symbol equations for the four types of reactions studied.

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