1. You took out your best bread knife and used it to slice your bread. After using it, you washed it and forgot to dry it afterwards. Later, you noticed reddish brown spots. Is it physical or chemical change? Support your answer. Chewing food to break it down to small pieces and the changing of starch into sugars through enzymes in the digestive system: is it physical or chemical change? Explain your answer
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.
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