1 pt

In a reaction A --> B, when C is added it reacts irreversibly with A. What can we say about C? A. C will make the reaction sp

pav-90 [236]

The answer is C. For C, it can react irreversibly with A. That means when adding C, the concentration of A will decrease. For reaction A-->B. if A decrease, then the reaction rate will decrease.

8 0

3 years ago

In a first–order reaction (A → B and rate = k [A]), tripling the concentration of A will have what effect on the reaction rate?

Natali [406]

Answer:

Tripling the concentration of A will triple the reaction rate.

Explanation:

For a first–order reaction hat has a rate law:

Rate = k[A].

It is clear that the reaction rate is directly proportional to the concentration of A.

Rate ∝ [A].

So, Tripling the concentration of A will triple the reaction rate.

5 0

4 years ago

Select the pair that consists of a base and its conjugate acid in that order. CO32−/CO22−

lana [24]

Answer: The pair that consists of a base and its conjugate acid in that order. $NH_3/NH_4^+$

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

$H_3PO_4\rightarrow H_PO_4{2^-}+2H^+$

$H_2CO_3\rightarrow HCO_3^-+H^+$

$NH_3+H^+\rightarrow NH_4^+$

$HCO_3^-\rightarrow CO_3^{2-}+H^+$

$NH_3$ is gaining a proton, thus it is considered as a brønsted-lowry base and after gaining a proton, it forms $NH_4^+$ which is a conjugate acid.