Refer to the two diagrams below to answer Questions 5 - 9
2H/10) 2010)
Reactants
2H O() 2H OM
286 kJ/mol
2H/a)
Products
288 kJ/mol
H,
Products Reactants
Combustion of hydrogen
Decomposition of water
5. How does this energy diagram differ from those in Lesson 11?
6. Consider the combustion of hydrogen.
a. Isenergy required to make the combustion of hydrogen happen? Use evidence from
the demonstration to explain your thinking,
b. Do you think the reaction feels hot or cold? Explain.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

the dissolution of polymer can be thermodynamically described in 2 steps.

elements make up everything, and they combine to make compounds.

the answer is c

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