1· How is a chemical change distinguished from a physical change? Chemical chan

Question

1· How is a chemical change distinguished from a physical change? Chemical chan isan chang thal es hew e ··· ··· t bonds between atom 2. List four kind s of observations that can lead you to conclude that a chemical change has east e phgrienl efect such.as theemssion f obsenV and light , the go-maton t a pieci pitate, the- 3. How small of a change in temperature can you detect by touch? How could smaller changes in temperature be detected/ Soma- of these ace tke laction temper afune cha the hed s being paceive ,th is beny pancived 0 What would you expect to observe if KHCO, reacted with HBr? What test would you use to identify the product? 4. ello 5. How might a burning magnesium wire be used in a commercial application?

Explanation / Answer

4)

There will be effervescence of CO2
potassiumhydrogen carbonate + hydrobromic acid ==> potassium bromide + CO2 + water
KHCO3 + HBr(aq ) ==> KBr (aq) + CO2 + H2O
Test for K flame test violet
Br- perhaps Ag+ ions aq pale yellow ppt
CO2 limewater cloudy

5)
Burning Mg wire to initiate Thermit reaction for welding Rails

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