Question 3 3 pts

(07.05 LC)

What happens to the rate of most reactions as the reaction progresses? (3 points)

The rate change depends on the energy change of the reaction.

The rate decreases as the concentration of the reactants decreases.

The rate increases as the concentration of the products increases.

The rate remains constant over the course of the reaction.

Question 4

3 pts

The rate decreases as the concentration of the reactants decreases.

Normally in a chemical reactions, reactants react with the product to form  reactants. The continuous availability of the reactants ensure constant formation of the products, thus the reaction continues to progress.

However, after a period of time,of reaction progress, the rate of reaction drops.This is because, the  concentration of reactants  has been used up, and therefore more product is formed.Thus the concentration of both the reactants and product changes; and this slows down  the rate of reaction as the concentration of the reactants drops.

Explanation:

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."