Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?
А
Because they are compounds, they cannot be pure substances.
B
Both compounds are considered pure substances.
These compounds have specific physical properties that never
change.
D
These compounds have distinct chemical properties.

This is false

А

Because they are compounds, they cannot be pure substances.

Because:Compounds are pure substance

i think it is true since you can test the answer and can use observations to complete it.

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.