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.
In the following diagrams, the different colored spheres represent atoms of different elements.
Select the diagram or diagrams that represent each of the listed situations. (Note that there may be more than one correct answer for a given situation and that answers may be used more than once or not at all.)
a.Which diagram(s) represent(s) a compound whose molecules are triatomic?
b. Which diagram(s) represent(s) a mixture of two compounds?
c. Which diagram(s) represent(s) a mixture that contains two different types of diatomic molecules?
d. Which diagram (s) represent(s) a pure substance?
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