Hello, does anyone know the answers to these application questions from the U3 Chemistry Sample Work??
1. The human body uses catalysts called enzymes to lower the activation energy of some reactions required for life. What is one way that the use of enzymes is helpful in the body? (p.10)
2. When an exothermic phase change occurs, such as freezing water into ice crystals, where does the energy released go? (p.2)
3. When a flashlight battery runs out of energy (charge) does that mean the energy has been destroyed? Why or why not?
4. Describe what happens on the molecular level when hot water is poured over ice to melt it. (p.3)
5. Explain why wood insulates and metal conducts heat energy.
6. What can you infer from the diagram of state changes? (p. 10)
7. Why is it that the bonds in nitrogen gas are particularly hard to break? (p.2)
8. The bond energy between two hydrogen (H) atoms is much higher than two iodine (I) atoms.Why do you think this is? (p. 2 and 3)
I don't have the information you have and I don't know what is on p10 or p5 or page whatever. Here is some help.
1. All you need to do is Google this. I did and found many examples. Trypsin, for one, an enzyme used to digest protein.
2. In a reaction you have the system and the surroundings. Exothermic reactions produce heat that goes to the surroundings.
3. Energy is redirected.
5. Look up the specific heats of wood and a metal such as aluminum.
6. I don't see a diagram.
7. N-N is a triple bond and not a single or double bond.
8. H-H bond which is a bond between the SMALLEST atoms available. I-I is a much larger atom so the bond distance is much longer. What do you know about force vs distance?