PLEASE HELP

As climbers ascend (go up) a mountain, the amount of oxygen in the atmosphere decreases. In the body, hemoglobin (Hb) in red blood cells binds with oxygen (O2) to form oxyhemoglobin (HbO2).

This equation can be used to model the equilibrium between hemoglobin , oxygen, and oxyhemoglobin.

Hb + O2 <--> HbO2

According to Le Chatelier, how would the equilibrium shift as the climbers ascend to higher altitudes?

Question 1 options:

It shifts to the left

It shifts to the right

It would not shift

There is not enough information to answer this question

Question 2 (1 point)
Is the following reaction endothermic or exothermic?

N2 + 2 H2 <-> 2NH3 + heat

Question 2 options:

endothermic

exothermic

Question 3 (2 points)
Stress was added to the following reaction and this was the result:

As4O6 + 6C <-> As4 + 6CO

The equilibrium shifted to the right and the reverse reaction decreased.

Select all factors that would have caused this observation.

Question 3 options:

CO was added to the system

As4 was added to the system

As4 was removed from the system

As4O6 was removed

Question 4 (1 point)
If CO2 was added to this system what would the outcomes for this reaction be?

CO2 + H2O <-> H2CO3

Question 4 options:

It would shift to the right, favor the forward reaction and the rate of reaction would decrease.

It would shift to the left, favor the forward reaction and the rate of reaction would increase.

It would shift to the right, favor the forward reaction and the rate of reaction would increase.

It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.