Chemistry, 05.10.2019 04:40 2021andrewkell

Asubstance that changes the rate of the reaction and is not consumed in the reaction 1 catalyst 2. a uniform mixture of molecules or ions of one substance in another solvent 3. the substance dissolved in a solution solute 4. the substance that does the dissolving in a solution 2 solution

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Answer from: miargaree1823

Answer by YourHope:

Hi! :)

Answers:

A catalyst is a substance that changes the rate of the reaction, and is not consumed in the reaction!

A solution is a uniform mixture of molecules or ions of one substance in another!

A solute is the substance dissolved in a solution!

A solution is the substance that does the dissolving in a solution!

Have a BEAUTIFUL day~

Answer from: cristian901997

Option (1) is the correct answer.

Explanation:

A catalyst is defined as the substance that helps in decreasing the activation energy of a chemical reaction so that more number of reactant molecules can participate in the reaction.

During this process the catalyst doesn't get consumed in the chemical reaction.

As a result, a catalyst also helps in increasing the rate of a chemical reaction.

Thus, we can conclude that a substance that changes the rate of the reaction and is not consumed in the reaction is known as a catalyst.

Answer from: Quest

Talc (french chalk) is the ingredient

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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