Does energy have balance?

The first law of thermodynamics means that

• Energy is neither created nor destroyed.

• All of these are apply

• In a thermal power station energy starts as chemical bonds which are turned into heat to make kinetic energy then electrical energy.

• Energy enters the food chain as light, becomes chemical and leaves as heat.

Energy must continue to enter an open system to enable it to function. True or false.

The second law of thermodynamics is to do with entropy. This means that ......

• You have to keep your room tidy

• There is an increase in the amount of energy available to do work in a system.

• Entropy does not change things in a closed system.

• There is an increase in disorder and randomness in a system.

Does this diagram show the law of entropy?

Yes or no?

In a food chain increase in entropy means there is less energy available to do work, therefore higher trophic levels have fewer animals. True or false?

Feedback in a system can be positive, negative or neutral. True or false?

This diagram shows negative feedback because

• It amplifies change and keeps the system going in the same direction.

• It changes the systems to a different state.

• It reverses the change and restores equilibrium.

• All the bunnies die.

• All the foxes die.

This picture shows the tipping point. Which statement is NOT true of tipping points?

• A system kick-starts self-perpetuating change.

• The environment may collapse

• Positive feedback loops continue.

• The system returns to its original state of equilibrium

Which of the following diagrams is accurate?

• 
• 
• 
• 

This is called ................-.................. equilibrium