A+b→2c when the reaction begins, the researcher records that the rate of reaction is such that 1 mole of a is consumed per minute. after making changes to the reaction, the researcher notes that 2 moles of a are consumed per minute. what change could the researcher have made to effect this change?

From kinetically point of view speed of the reaction depends on:

speed of the reaction = k [A] [B]

So to increase the speed of the reaction the researcher made this changes:

1. Increase the concentration of reactants

2. Increase the temperature

3. Add a catalyst to lower the activation energy of the reaction

Temperature and activation energy are found behind the k constant and they have an influence on the reaction speed.

The researchers can do to increase the rate of consumption of mol A:

Chemical reactions involve several factors, including factors such as reactants and products and external factors such as temperature and pressure

Factors that influence the speed of reaction in product formation.

Influencing factors include:

the concentration of the reactants, the faster the reaction will be

The form of reactant molecules in the form of powder or solids affects the speed of the reaction. For the same number of masses, the smaller particle size will make the reaction run faster because the reaction involves the larger surface area of the reactant

Catalysts are added to help the reaction faster

Low activation energy is usually due to the addition of a catalyst. The catalyst makes activation energy more lace. The activation energy itself is a minimum of energy that must be possessed to a particle so that the collision produces a reaction

External factors that influence include:

Pressure will reduce the volume so that the reaction increases

High pressure also causes the reaction rate to be faster. The number of collisions between molecules is greater because of the distance between the molecules.

High temperatures will speed up the reaction that occurs

the temperature is related to kinetic energy, heating makes kinetic energy increase and particles occur more often because particles move faster

For reaction

A + B ---> 2C

Reaction speed can be formulated:

where

v = reaction speed, M / s

k = constant, mol¹⁻⁽ᵃ⁺ᵇ⁾. L⁽ᵃ⁺ᵇ⁾⁻¹. S⁻¹

a = reaction order to A

b = reaction order to B

[A] = [B] = concentration of substances

So the researchers can do to increase the rate of consumption of mol A to 2 mol / min  :

the factor can decrease the rate of a chemical reaction

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increase the rate of a chemical reaction

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Which of the following does not influence the effectiveness of a detergent

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Keywords: reaction rate, products, reactants , the researcher

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e