7. A study of hypothetical reaction 2A + B -----> C + D gave these results: Experiment Initial Concentration (mol/L) Initial Rate (mol L-1 s-1) [A] [B] 1 0.10 0.050 6.0 × 10-3 2 0.20 0.050 1.2 × 10-2 3 0.30 0.050 1.8 × 10-2 4 0.20 0.150 1.1 × 10-1 a) What is the rate law for this reaction? b) Calculate the rate constant k and express it in appropriate units.
Enzyme kinetics
In biochemistry, enzymes are proteins that act as biological catalysts. Catalysis is the addition of a catalyst to a chemical reaction to speed up the pace of the reaction. Catalysis can be categorized as either homogeneous or heterogeneous, depending on whether the catalysts are distributed in the same phase as that of the reactants. Enzymes are an essential part of the cell because, without them, many organic processes would slow down and thus will affect the processes that are important for cell survival and sustenance.
Regulation of Enzymes
A substance that acts as a catalyst to regulate the reaction rate in the living organism's metabolic pathways without itself getting altered is an enzyme. Most of the biological reactions and metabolic pathways in the living systems are carried out by enzymes. They are specific for their works and work in particular conditions. It maintains the best possible rate of reaction in the most stable state. The enzymes have distinct properties as they can proceed with the reaction in any direction, their particular binding sites, pH specificity, temperature specificity required in very few amounts.
7. A study of hypothetical reaction 2A + B -----> C + D gave these results:
| Experiment | Initial Concentration (mol/L) | Initial Rate (mol L-1 s-1) | |
| [A] | [B] | ||
| 1 | 0.10 | 0.050 | 6.0 × 10-3 |
| 2 | 0.20 | 0.050 | 1.2 × 10-2 |
| 3 | 0.30 | 0.050 | 1.8 × 10-2 |
| 4 | 0.20 | 0.150 | 1.1 × 10-1 |
a) What is the rate law for this reaction?
b) Calculate the rate constant k and express it in appropriate units.
8. The reaction 2 NO(g) + 2 H2(g) -------> N2(g) + 2 H2O(g) is found to be first-order in H2(g). Which rate equation cannot be correct?
a) Rate = k[NO]2[H2]
b) Rate = k[H2]
c) Rate = k[NO]2[H2]2
9. When phenacyl bromide and pyridine are both dissolved in methanol, they react to form phenacylpyridinium bromide.
When equal concentrations of reactants were mixed with methanol at 35°C, these data where obtained:
| Time (min) | [Reactant] (mol/L) | Time (min) | [Reactant] (mol/L) |
| 0 | 0.0385 | 500 | 0.0208 |
| 100 | 0.0330 | 600 | 0.0191 |
| 200 | 0.0288 | 700 | 0.0176 |
| 300 | 0.0255 | 800 | 0.0163 |
| 400 | 0.0220 | 1000 | 0.0143 |
a) What is the rate law for this reaction?
b) What is the overall order?
c) What is the rate constant?
d) What is the
![. A study of the hypothetical reaction 2A + B --C+D gave these results:
Intlal Concentration (mol/L
Intal Rate
motL
6.0 x 10
0.10
0.050
0,20
0.050
1.2 x 10-2
1.8 x 10-
1.1 x 10
0.30
0.050
0.20
0.150
a) What is the rate law for this reaction?
b) Calculate the rate constant k and express it in appropriate units.
S. The reaction
2 NO(g) + 2 H,(g) N2(g) + 2 H,0(g)
is found to be first-order in H,(g). Which rate equation cannot be correct?
a) Rate = k[NO] [H;]
c) Rate = k[NOJ°[H¿J²
b) Rate = k[H2]
9. When phenacyl bromide and pyridine are both dissolved in methanol, they react to form phenacylpyridinium bromide.
C,Hs-C-CH,Br + C3H5N -
CHs-C-CH,NC;H + Br"
When equal concentrations of reactants were mixed in methanol at 35°C, these data were obtained:
Time IReactand
(mol/L)
Time TReactant
0.0385
500
0.0208
100
0.0330
600
0.0191
0.0288
700
0.0176
200
300
0.0255
800
0.0163
400
0.0220
1000
0.0143
a) What is the rate law for this reaction?
b) What is the overall order?
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) What is the rate constant?
d) What is the rate of this reaction when the concentration of each reactant is 0.030 mol/L?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1e4c0e61-4062-42f2-969c-3b777a2e0973%2Fe8194d59-6df5-4028-8ccb-bff341fe8880%2Fa0uz8au_processed.jpeg&w=3840&q=75)
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