A + B + CD is: a. How will the reaction rate change if [A] is doubled?

The reaction rate will increase.

Rate = k[A]2[B] b. How will the reaction rate change if [B] is decreased to 1/4th of the initial concentration?

c. How will the reaction rate change if [C] is increased by 3times? What is the expected rate constant value for this experiment?

Explanation:

A + B + C → D

Given rate law of the reaction :

a) Rate of the reaction  if [A] is doubled = R'

R' = 4 × R

The rate of the reaction will change by factor of 4.

b) Rate of the reaction  if [B] is  reduced to quarter = R'

R' = 0.25 × R

The rate of the reaction will change by factor of 0.25.

c) Rate of the reaction  if [C] is increased by 3 times= R'

Rate law of the reaction :

As we can see that [C] does not appears in rate law of the reaction, which means that rte of the reaction is independent of [C].

R' = R

The rate of the reaction will remain the same.

The expected rate constant value for this experiment:

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hope this .

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.