Answer:
pathogens antigen mark me as brain list
Answer: c
Explanation:energy cannot be made or destroyEd according to a law of energy
The problem could be a fuel related problem or a starting battery related problem according to the structure of an engine. An engine needs a good electric current, a good fuel flow, a good air compressing and a good cranking speed in order to start up. The problem on Joel's machine could be in its fuel pump or starting battery. It is because all of the engine parts working good besides those two parts.
C, the one with the most neutrons
Answer: (3) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.
Explanation:
1) The equation given is H₂(g) + Cl₂(g) → 2HCl(g) + energy
2) The energy is shown in the product side, so energy is a product of the reaction, so energy is release.
But this is just the net energy of the process. You need more insight to deal with the energy changes in the reaction.
3) Chemical bonds store energy; this stored energy is the potential chemical energy of the molecules.
When a chemical reaction occurs, the first stage is to brake bonds.
Braking chemical bonds requires energy to overcome the bond energy. Braking bonds always absorbs energy.
On the other hand, forming bonds always release energy.
The neat energy of the reaction is the difference between the energy needed to break bonds and the energy released when new bonds form.
So, regardless the fact that, in the chemical equation that represents the reaction a net energy release is shown, you know that energy is absorbed as bonds are broken, and energy is released as bonds are formed (option 3).
