What are 3 factors that can change the rate of a reaction?
The factors that affect reaction rates are:
- surface area of a solid reactant.
- concentration or pressure of a reactant.
- nature of the reactants.
- presence/absence of a catalyst.
What are 3 ways that speed up a chemical reaction?
- The concentration of the reactants. The more concentrated the faster the rate.
- Temperature. Usually reactions speed up with increasing temperature.
- Physical state of reactants.
- The presence (and concentration/physical form) of a catalyst (or inhibitor).
What can change in a chemical reaction?
The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.
Why do redox reactions change Colour?
The color changes are the result oxidation and reduction or a redox reaction. The potassium permanganate is reduced (gains electrons), while the sugar is oxidized (loses electrons). First, the permanangate ion (purple in solution) is reduced to form the manganate ion (green in solution):
What is the example of change in Colour?
Copper reacts with oxygen, H2O and CO2 to give copper carbonate, which changes color from brown to blue or blue green. Rusting, blackening of surfaces of cut vegetables and fruits are other examples of change of color in a chemical reaction.
How does oxidation change color?
As the oxidation state of the metal increases, so also does the amount of splitting of the d orbitals. Changes of oxidation state therefore change the colour of the light absorbed, and so the colour of the light you see.
What color is oxidation?
When oxidation occurs, large flakes of pigment are created, which form the final permanent dyes within the cortex – the target shade is a specific mix of red, blue and yellow tones.
Why is Zn2 ++ colorless?
Although there is splitting, but because of the d10 configuration, there is no vacancy in the higher energy d orbital for the promotion to take place. Since no colour is absorbed, the white light passes through and hence the solution appears colourless.
Why is Cu+ not Coloured?
the colour of transition elements is due to the presence of unpaired electrons. cu+ is colourless as its outermost configuration is 3d10 …so there are no unpaired electrons which causes the colour .
Is ti 4 a Colour?
Ti4+is a very small cation as compared to Ti2+ and hence, does not absorb any light. Hint: Titanium is a chemical element with the symbol Ti and atomic number 22. It is a lustrous transition metal with a silver color, low density, and high strength.
Is Ti2+ A Colour?
Ti2+ is coloured ion whereas ti4+ is colourless.
Is Zn2+ A Colour?
Why? Ans. Cu2+ (3d 9 4s 0) has one unpaired electron in d-subshell which absorbs radiation in visible region resulting in d-d transition and hence Cu2+ salts are coloured. No radiation is absorbed for d- d transition and hence Zn2+ salts are colourless.
Why are zinc salts white in Colour?
The Zn salts are white because this transition element has no free electron in d-orbital , so by this there is no d-d transitions hence it does not show color . While Cu2+ salts are coloured since according to there electronic configuration it has free electrons which show color due to d-d transition .
Why salts of Zn and Cu+ are white?
Solution. Zn2+(3d10) salts have no impaired electrons but Cu2-(3d9) salts have one unpaired electrons. Hence Zn2+ salts are white while Cu2- salts are coloured.
Why cupric salts are Coloured?
The cupric ion (Cu++ ) has one unpaired electron as it has configuration 3d9 . By absorbing the visible light, the unpaired electron can migrate from one set of d‐orbitals to another under the applied field of water molecules. Hence, cupric ion (Cu++) in aqueous solution shows blue colour.
Why are Zn 2 salts Colourless?
Detailed Answer: (i) Zinc has no unpaired electrons in has a stable fully filled d orbital its d orbital and state. Thus, due to absence of unpaired electrons, Zn2+ salts are colourless.
What is the Colour of cupric salt?
Why CD salts are Colourless?
Why are Cd2+ salts white? Transition element exhibit colour to d-d transition. d-d transition will be possible only when d- subshell is not fully filled. thus there will be not d-d transition take place, so Cd2+ is white.
Why are all salts of scandium white?
Compounds of transition metals are coloured because they absorb light for d-d transition, however in case of Sc as the d orbital is empty after formation of compound hence there is no d-d transition thus the compounds appear white.
What is the electron configuration of CD 2?
2. The ground state electron configuration of ground state gaseous neutral cadmium is [Kr]. 4d10.
Why do transition elements show variable oxidation state?
These elements show variable oxidation state because their valence electrons in two different sets of orbitals, that is (n-1)d and ns. The energy difference between these orbitals is very less, so both the energy levels can be used for bond formation. Thus, transition elements have variable oxidation states.