#1 #2 Use the pictures above to answer questions 12 & 13. #3 12 Which picture or pictures best show a pure element? A. Picture #1 & Picture #2 B. Picture #1 only 13 Which picture shows a pure compound? A. Picture #1 & Picture #2 B. Picture #1 only C. Picture #3 & Picture #4 D. Picture #4 only C. Picture #3 & Picture #4 D. Picture #4 only #4 14 Which is NOT a characteristic of a solid? A. Fixed shape and fixed volume. B. Atoms or molecules very closely packed together in a regular arrangement. C. The atoms or molecules vibrate at different rates at different temperatures. D. The free surface is a gravity surface, and always horizontal to the Earth's surface. What is a solid substance in which the atoms and molecules are in a repeating 3- 15 dimensional arrangement or bonding pattern throughout? A. Crystalline solids B. Amorphous solids C. Ambidextrous solids D. Marl solids What is a solid substance in which the atoms and molecules are randomly or 16 inconsistently arranged throughout? There is no repeating pattern or arrangement. A. Crystalline solids C. Ambidextrous solids B. Amorphous solids D. Marl solids

Q: C. D. тео So list ног A 1. Na OE7 2. 3. HO, A

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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.