Determine the classes of matter described by each question. Each question may describe more than one class of mater. In which of these classes must two or more substances be present?Which of these classes could not possibly have a variable composition?For which of these classes is separation into simpler substances by physical means possible? Answer bank: pure substances, homogenous mixtures, heterogenous mixtures
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.
Which of these classes could not possibly have a variable composition?
For which of these classes is separation into simpler substances by physical means possible?
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