Ex. NaCI+ AgNO, (g)Agel NaNO, 8) In doing so many reaction, it is preferred to u

Question

Ex. NaCI+ AgNO, (g)Agel NaNO, 8) In doing so many reaction, it is preferred to use to distilled water over tap water, Can you explain the reason why? 9) Learn how to calculate the % yield from the reaction. Ex. The intimal mass of Cu is 0.45g, and the amount of copper that was recovered was 0.43g. Calculate the percent yield. % Yield-x100%-95.5% 10) Explain the purpose of adding Zn or Al in a blue Copper (CuSO) solution. 11) Practice the following calculation: A) The mass of evaporating dish and Mg is 15.5g. The mass of evaporating dish by itself is 13.6g. Calculate the mass of Mg. B) Calculate the percentage composition of Ca in Ca(NO,), 12) Practice some properties of gases. How could you distinguish between CO, from H.s so, from N,o. 3 Eplein-in-your own words what precipitate means. 14) What is a chemical reaction? How do you know or identify chemical reaction occurred? 15) Learn the name of chemical formulas that we used in the labs. Example: Ammonium chloride, copper (I) sulfate, Hydrochloric acid, Aluminum sulfate, Sulfuric acid, Nitric acid. CAPS Status Charge Poser

Explanation / Answer

You can distinguish CO2 and H2S by their smell. H2S has rotten egg like smell while CO2 is odourless.

Also, on passing the two through lime water, there are different observations. CO2 turns lime water milky while H2S doesn't.

Sulphate and nitrous oxide can be distinguished by their smell. N2O has a euphoric effect when inhaled. Sulphates are usually liquid (H2SO4) or solid(calcium sulphate). Adding BaCl2 to sulphates gives a white precipitate of BaSO4.

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