Which one of the following statements is correct? A. Muddy water is an example of a heterogenous mixture. B. Carbon dioxide gas is an example of an element. C. The air we breathe is a mixture. It consists of only Oxygen gas (O2). D. A compound consists of only one type of element, for example Cl₂. Which of the following do not have an ionic bond in the molecule? A. K₂O B. CaCl₂ C. NH3 D. Snl4 Which one of the following statements about atomic mass is true? A. Atomic mass is the same as the molecular weight. B. Atomic mass is the number of protons in the atom. C. Atomic mass is the number of neutrons and the number of electrons. D. Atomic mass is the number of protons and the number of electrons. Convert 2.1 x 10-³ L to cm³: A. 2.1 x 10³ cm³ B. 0.9261 cm³ C. 2.1 x 10.9 cm³ D. 2.1 cm³

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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.