AQA Sheet- Any help appreciated :DBonnie and clyde were asked to find out the percentage composition of brass. they were told that zinc dissolved in hydrochloric acid to give a solution of zinc chloride and hydrogen gas.Copper does not react with hydrochloric acid.They carried out the following procedure but steps 3 5 and 6 are missing complete the steps1-they weighed out 10g of brass shavings.2-they added the shavings to some hydrochloric acid. they stirred the mixture and waited until the reaction was finished.3- …4-they collected the solid and washed it with lots of dissolved water.5-…6-…Also answer the following questions:1 why did they use brass shavings and not a brass block?2 in step 2 how could they tell the reaction was finished?3a if the mass of copper was found to be 6.5g what was the mass of zinc?3b what was the percentage composition of the brass?thanks
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Yes, you have to use a concrete drill bit and a high powered drill. Also, if possible put your screws into grout instead of the tile.
You have to drill holes, using a masonry bit, thru the tile, and use an anchor of some sort. Best would be some sort of toggle bolt thru the drywall itself. A plastic expansion anchor would suffice. Any force on the tile itself, may cause eventual breakage.
1-they weighed out 10g of brass shavings. 2-they added the shavings to some hydrochloric acid. they stirred the mixture and waited until the reaction was finished. 3- they poured off the acid solution. 4-they collected the solid and washed it with lots of dissolved water. 5-dried the washed solid… 6-.weighed the dry solid.… Also answer the following questions: 1 why did they use brass shavings and not a brass block? increasing the surface area of the brass exposed to the HCl, sppeed the reaction 2 in step 2 how could they tell the reaction was finished? it quit bubbling 3a if the mass of copper was found to be 6.5g what was the mass of zinc? 10 - 6.5 3.5 grams of Zn 3b what was the percentage composition of the brass? 3.5 / 10 35% Zinc
