Unit 3: 3 - Energy Calculations Flashcards

1
Q

What is the formula to find out the energy transferred to a substance?

A

Q = mcΔT

Heat energy transferred (J) = mass of liquid heated (g) × SHC of the liquid (J/g°C) × Change in temperature of the liquid (°C).

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2
Q

Show the shape of the energy change on an exothermic reaction graph.

A
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3
Q

Show the shape of the energy change on an endothermic reaction graph.

A
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4
Q

Give the 2 main reasons why hydrogen (at the moment) could be polluting or unsustainable?

A
  • Most hydrogen at the moment is made by reacting steam with coal or natural gas, which are both non-renewable;
  • Hydrogen can be made by passing energy through water, however most electricity is generated using coal and other fossil fuels, so pollution from these fuels still occurs.
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