Respuesta :
A. adding a positive catalyst
Further explanation
The real problem:
Which will increase the rate of a chemical reaction?
A. adding a positive catalyst
B. decreasing the pressure
C. decreasing the temperature
D. adding a negative catalyst
If we want to increase the rate of reaction, the factors that influence are as follows:
- Increase in concentration. Collisions often occur because of the large number of particles.
- Increase in temperature. The higher the temperature, the greater the kinetic energy of the particles so that they can exceed the activation energy.
- Increasing the pressure (compressing) of the gas. Collisions will often occur because space is getting smaller.
- Expanding the surface (smoothing) of solids. Collisions easily occur because the touch area is getting wider.
- Add a positive catalyst. This can reduce the activation energy so that many particles have kinetic energy above the activation energy.
- Do not add a negative catalyst. Negative catalysts do not reduce activation energy but rather are combined with reactant molecules thereby reducing the number of colliding reactant molecules. This reduces the effective collision, hence the rate of reaction.
Thus, based on all the factors above, the right answer to the problem is adding a positive catalyst.
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Notes
- Most chemical reactions in living organisms that maintain life will not take place fast enough at normal temperatures if there are no enzymes.
- An enzyme is a type of catalyst, a substance that can increase the rate of chemical reactions without being consumed in the reaction.
- Catalysts are widely used in the industry because they produce products faster, thereby reducing costs.
- The catalyst does not increase the amount of production, the catalyst only accelerates the reaction rate, and is not included either as a reactant or as a product in the reaction. Thus, the catalyst is considered not to react.
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The rate of a chemical reaction can be increased by the following method:
- By increasing the temperature
- By increasing the concentration of reactants
- By adding a catalyst in the reaction mixture
Further Explanation:
A molecule that helps in increasing the speed of chemical reaction without being a reactant is referred to as catalyst. In a biochemical reaction, enzymes act as a catalyst. Enzymes are generally proteins, although some of the ribonucleic acid molecules also act as enzymes.
The activation energy is referred to as the amount of energy essential to start the reaction. Enzymes work by the binding of reactant molecules to the substrate .and hold them in a manner that the chemical bond-forming and bond-breaking processes occur more readily. The enzymes do not affect the ΔG value ; they don’t affect the energy-absorbing or releasing energy. The reason is that they don’t change the free energy of a reactant or product. By increasing temperature, the rate of the chemical reaction increases because, due to the increase in the temperature, the average kinetic energy of the reacting molecules increases.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Chemical Kinetics
Keywords:
Reactant, product, enzyme, bond, activation energy, bond-breaking, transition state, reaction, catalyst, biochemical reaction, proteins.
