МАТСHING Match each term in Column A with its description in Column B. Write the correct letter in the space provided. Column A Column B 1. synthesis reaction a) breaks down compounds 2. decomposition reaction b) uses electricity 3. electrolysis and heat c) methods of decomposition 4. electrolysis d) simpler than a compound 5. an element e) builds compounds IDENTIFYING DECOMPOSITION REACTIONS Ten chemical equations are listed below. Some are decomposition reactions. Some are not. Mark a () in the correct box next to each equation. Not a Decomposition Reaction Decomposition Reaction Equation 1. CuCl, Cu + CL, 1. 2. 3Hf + 2N, Hf,N, 3. Zn + 2HC1 ZnCl, + H, 4. H.CO, H,O + CO, 5. 2NAOH 2Na + O, + H, 6. Fe + S Fes 7. CaCO, CaO + CO, 4P + 50, 2P,O, 9. C + O, CO, 10. Ca(OH), CaO + H,O REACHING OUT 1. Does boiling decompose water? 2. What does boiling do to water? 214

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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.