21. Which of the following involves a change of state in matter? * a. Adding food color to water b. From clouds to raindrops C. Placing a candy bar on scale d. Chopping of wood 22. Why do naphthalene balls disappear with time without leaving any solid? * a. Naphthalene balls sublimes. b. Naphthalene balls evaporates. c. Naphthalene balls are gases. d. Naphthalene balls condenses 23. Lenlen left a glass full of water on top of a table. After several days, the amount of water in the glass decreased. What process took place with the water in the glass? * a. Condensation b. Evaporation C. Solidification d. Sublimation

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.