List the three requirements for a correctly written chemical equation.2. Give one example of a word equation, one example of a formula equation, and one example of a chemical equation.3. Write formulas for each of the following compounds. a. potassium hydroxide b. calcium nitrate

Requirements for a correctly written chemical equation are reactants and products, their formula and valency

Explanation:

Formula of the given compound are -

1 - Potassium Hydroxide -

2 - Calcium Nitrate -

The requirements for a correctly written chemical equation are -

Example of word equation, formula equation, and chemical equation is as follows -

Aluminium + iron9(III)oxide ⇒ aluminium oxide + iron (word equation)

 +    ⇒    + (formula equation)              

+    ⇒     + (chemical equation)

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