6 Pre-Laboratory Assignment SectionOLL Date l121 120)7 Na Classifying Chemical R

Question

6 Pre-Laboratory Assignment SectionOLL Date l121 120)7 Na Classifying Chemical Reactions ts used in this esperiment are flammable? Discuss the safety precautions that are necessary when working with flammable chemicals 2. Summarize the following description of a chemical reaction in the form of a bal When solid sodium bicarbonate is heated in a test tube, an invisible gas, carbon dioxide, is released into the surrounding air. Water condenses at the mouth of the test tube and a white solid residue, sodium carbonate, remains behind in the bottom of the test tube." 3. Common observations of a chemical reaction are described in the Introduction section. For each observation, name a common or everyday occurrence that must involve a chemical reaction. Example: When a candle burns, it gives off light and heat. The production of light and heat is evidence for a chemical reaction 4. The relative reactivity, or activity, of different metals can be determined by studying their single-replacement reactions with other metal compounds. Rank the following metals, copper, zinc and silver, from most active to least active based on the reactions summarized below. Explain your reasoning Zn(s) + CuCl,(aq) Cu(s) + ZnCl2(aq) Cu(s) + ZnCl2(aq)-NR Cu (s) + 2AgNo, (aq) 2Ag(s) + Cu(NO3)2 (aq)

Explanation / Answer

Q1

when working with flammables:

- Avoid sparks

- Do not work near open flame

- Avoid high temperature areas

- Always use protective gear

Q2

2NaHCO3(s) + heat = Na2CO3(s) + H2O(g) + CO2(g)

balance

NaHCO3(s) + heat = Na2CO3(s) + H2O(g) + CO2(g)

Q3

The bubble formation / decrease in mas of solid is sign of gas production , i.e. a chemical reaction

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