Write true for the correct statements and false for the A physical change is a change in the composition of a subs A homogeneous mixture always contains only one phase. 3 Atoms combine chemically to form elements. 4 Two different substances can not have similar physical pro Acids, bases and salts are all compounds. 6. The properties of a substance that can be observed witho physical properties.- The ability of iron to conduct electricity is a chemical pro

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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.