Classify each of the following as a physical change or a chemical change. For each chemical change, explain how you can tell that a new substance has been formed.
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.
Classify each of the following as a physical change or a chemical change. For each chemical change, explain how you can tell that a new substance has been formed.
(a) Water boils and turns into steam.
(b) Wood is sawed and made into a toy box.
(c) Firewood burns and ashes remain.
(d) Orange drink crystals are stirred into a pitcher of water.
(e) Sugar, eggs, and flour are mixed and baked into cookies.
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