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1) Look at the Black Copper Oxide. Do you think it is a pure substance or a mixture? Explain!
2) Write the symbols for the elements contained in copper oxide____________________.
3) In this experiment the copper oxide will be heated and only copper will remain. Will the products weigh more or less than the reactants?
4) Fill in the blanks
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Mass of Copper Oxide
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Mass of Copper after heating
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Mass of Oxygen
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5.00g
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4.00 g
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6.50 g
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1.63 g
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12.00g
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2.40 g
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5) If 100 g of Copper Oxide is heated and 80 g of copper remains, what % of copper oxide is copper? What % is oxygen?
6) If 5.00 g. of Copper oxide is heated and 4.00 g. of copper remains, what % of copper oxide is copper? What % oxygen?
7) Using your periodic table, write down the relative atomic mass (RAM) of Copper_______ Write down the RAM of Oxygen ________________
8) How many times heavier is one atom of copper compared to one atom of oxygen?___________________
9) If one atom of copper combines with one atom of oxygen in forming copper oxide
i) Write the formula of copper oxide_______________
ii) Write the Relative molecular mass (RMM) of copper oxide_______________
iii) What % of copper oxide would be copper_______________ What % Oxygen______________
10) If one atom of copper combines with two atoms of oxygen in forming copper oxide
iv) Write the formula of copper oxide_______________
v) Write the Relative molecular mass (RMM) of copper oxide_______________
vi) What % of copper oxide would be copper_______________ What % Oxygen______________
11) If two atoms of copper combines with one atom of oxygen in forming copper oxide
vii) Write the formula of copper oxide_______________
viii) Write the Relative molecular mass (RMM) of copper oxide_______________
ix) What % of copper oxide would be copper_______________ What % Oxygen______________
Your teacher will now review this with you and you will watch copper oxide being heated in the presence of hydrogen gas. Later, you will collect some data to work out the formula of copper oxide.
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