Match these items. 1. freezing equals melting charles' law 2. allows molecular attractions to increase boyle's law 3. p x v = k normal boiling point 4. v/t = k phase equilibrium 5. temperature at which vapor pressure = atmospheric pressure cooling effect

1. freezing equals melting - phase equilibrium

2. allows molecular attractions to increase - pressure cooling effect

3. PV=k - Boyle's Law

4. V/T=k - Charles' Law

5. temperature at which vapour pressure = atmospheric pressure - normal boiling point

Explanation:

Phase equilibrium is the stage at which the rate of freezing equals the rate of melting.

Pressure cooling effect allows molecular attractions to increase.

Boyle's Law states that at constant temperature, the pressure and volume vary with each other:

PV = constant (k)

Charles' Law states that at constant pressure, the volume and temperature vary with each other:

V/T = constant (k)

The temperature at which vapour pressure is equal to the atmospheric pressure is called the normal boiling point.

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.