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OLga [1]
3 years ago
11

Which process is an example of a chemical change?

Chemistry
2 answers:
Alinara [238K]3 years ago
6 0

Answer:

d- activating a glow stick

Explanation:

Glow sticks produce light through a chemical reaction.

Ilia_Sergeevich [38]3 years ago
5 0

Answer:

burning of paper

melting of lead

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The answer will be a because it's balance
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How many hours are in 188 years
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Read 2 more answers
What mass of octane must be burned in order to liberate 5270 kj of heat? δhcomb = -5471 kj/mol?
katrin2010 [14]
As,
                           5471 kJ heat is given by  =  1 mole of Octane
Then,
                    5310 kJ heat will be given by  = X moles of Octane

Solving for X,
                                  X  =  (5310 kJ × 1 mol) ÷ 5471 kJ

                                  X  =  0.970 moles of Ocatne

So, 0.970 moles of Octane will liberate 5310 kJ energy. Now changing moles to mass,
As,
                                  Moles  =  mass / M.mass
Or,
                                  Mass  =  Moles × M.mass
Putting values,
                                  Mass  =  0.970 mol × 114.23 g/mol

                                  Mass  =  110.83 g of Octane
6 0
3 years ago
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