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- 1. Multiple Choice
write the formula for the following compound:
Copper(II) nitrate
Cu(NO2)2
Cu(NO3)2
CuNO2
Cu3(NO)2
- 2. Multiple Choicewrite the formula for the following compound:
sodium hydroxideNaOHNaONa2ONaH2O - 3. Multiple Choice2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOHSynthesis (or combination)DecompositionSingle replacementDouble replacement
- 4. Multiple Choice3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2Synthesis (or combination)DecompositionSingle replacementDouble replacement
- 5. Multiple Choice2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4Synthesis (or combination)DecompositionSingle replacementDouble replacement
- 6. Multiple ChoiceCaCO3 ----> CaO + CO2Synthesis (or combination)DecompositionSingle displacementDouble displacement
- 7. Multiple ChoiceCuO(s) + 2 HCl(aq) ---> CuCl2 (aq) + H2O (l)
In the above reaction, you mixed the black CuO with 15 mL of HCL as called for in the directions. The solution turned an aqua color and all of the black solid disappeared. What was the limiting reactant?CuO (s)HCl (aq)CuCl2 (aq)H2O (l) - 8. Multiple ChoiceIn your copper lab, if you start with 1.50 g of Copper and end with 1.75 g of Copper, what is your percent yield?117%86%17%145%
- 9. Multiple ChoiceThe equation for Percent yield is:Initial mass divided by final mass x 100final mass - initial mass divided by 100final mass divided by initial mass x 100final mass - initial mass all divided by initial mass x 100
- 10. Multiple ChoiceYou get a percent yield of 115% in your copper lab. What is one explanation for this?You spilt your copper out of the beaker.Your finial copper product started to oxidize and turned green.You are bad at maths.Some of the copper escaped as the gas in reaction 1.
- 11. Multiple ChoiceYou get a percent yield of 85% in your copper lab. What is one explanation for this?You spilt your copper out of the beaker.Your finial copper product started to oxidize and turned green.You didn't manage to remove all of the aluminum from reaction 5 from the beaker.Some of the copper escaped as the gas in reaction 1.
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