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A negative enthalpy change represents an exothermic change where energy is released from the reaction, a positive enthalpy change represents an endothermic reaction where energy is taken in from the surro...

The first is in a closed economy, where there are just households and firms present and thus no exchange between the two in terms of spending and transfer of goods and services. The second is in an open e...

• Thin alveolar walls for O2 and CO2 to travel through - To travel across the membrane, gases have to be dissolved, so the alveolar walls are moist - Large surface area to volume ratio allows for maxi...

Rather than aimlessly searching through a novel looking for a quote, it is far easier to have a bank of quotes that you know well and can analyse, which can be applied to a variety of questions. To make s...

To tackle this question, start by expanding the brackets:
12x + 4y = 12 - 2y
Making x the subject of the equation requires x to be on its own. 
So, in this example, we need to first get ...