When a solution of iron(iii) nitrate is mixed with a solution of sodium hydroxide, a rust colored precipitate forms. this precipitate is probably when a solution of iron(iii) nitrate is mixed with a solution of sodium hydroxide, a rust colored precipitate forms. this precipitate is probably a. iron (iii) nitrate. b. sodium hydroxide. c. iron (iii) hydroxide. d. sodium nitrate. e. none of the above

c. iron (III) hydroxide

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The balanced chemical equation for solution of iron(III) nitrate is mixed with a solution of sodium hydroxide is:

As iron(III) hydroxide is insoluble in water , it is formed as a solid which is called as precipitate.

When a solution of iron(III) nitrate is mixed with a solution of sodium hydroxide, the precipitate formed is iron (iii) hydroxide, Fe(OH)₃.

The correct answer to the question is Option C. Iron (III) hydroxide

To know which option is correct, we shall write the net ionic equation for the reaction between iron(III) nitrate and sodium hydroxide. This is given below:

iron(III) nitrate => Fe(NO₃)₃

Sodium hydroxide => NaOH

Fe(NO₃)₃(aq) + NaOH(aq) —>

Fe³⁺(aq) + NO₃¯(aq) + Na⁺(aq) + OH¯(aq) —> Fe(OH)₃(s) + Na⁺(aq) + NO₃¯(aq)

Thus, the correct answer to the question is Option C. iron (III) hydroxide

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answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.