. In each of the situations below, it seems that a new substance may have been produced. Explain why each situation represents a physical change. a) A tailor makes a new suit out of a piece of fabric. b) A chef makes a salad out of lettuce, tomatoes, and cucumbers. c) A mechanic builds a boat engine out of a lawnmower. d) A chemist boils salt water until only salt crystals are left. e) A child makes juice by adding water to juice concentrate.
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.
1. In each of the situations below, it seems that a new substance may have been produced. Explain why each situation represents a physical change.
a) A tailor makes a new suit out of a piece of fabric.
b) A chef makes a salad out of lettuce, tomatoes, and cucumbers.
c) A mechanic builds a boat engine out of a lawnmower.
d) A chemist boils salt water until only salt crystals are left.
e) A child makes juice by adding water to juice concentrate.
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