Cycle 1 Exam Review

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Across
  1. 2. A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of a substance
  2. 3. A change to a substance that occurs without forming a new substance, such as a change in size or state of matter
  3. 4. The number of protons in the nucleus of one atom of an element
  4. 7. A negatively charged subatomic particle located in the electron cloud; involved in the formation of chemical bonds
  5. 10. A chemical bond between atoms of nonmetals in which electrons are shared
  6. 11. The tiny, very dense, positively charged region in the center of an atom that is made up of protons and neutrons
  7. 13. A substance that takes part in and undergoes change during a chemical reaction
  8. 16. A mixture in which the composition is uniform throughout the mixture
  9. 17. A positively charged subatomic particle located in the nucleus of an atom; contributes to the mass of the atom
  10. 20. The simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically
  11. 21. A new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a chemical reaction
  12. 25. The area surrounding the nucleus of an atom where the electrons are found
  13. 26. A scientific law stating that the mass of all reactants must equal the mass of all products; matter is neither created nor destroyed
  14. 27. A mixture in which the composition is not uniform throughout the mixture
Down
  1. 1. A change that involves one substance being pulled apart or combined with another substance to form a completely different substance or substances
  2. 3. A substance produced during a chemical reaction
  3. 5. A form of matter that consists of the same type of atom or molecule throughout
  4. 6. The electrons in the outermost energy level of an atom that influence how an element will react with other substances
  5. 8. A number written below and to the right of a chemical symbol that shows the number of a specific type of atom present
  6. 9. The mass of an atom, approximately equal to the number of protons and neutrons in the atom
  7. 12. The columns on The Periodic Table that arrange the elements by the number of electrons that are in the outermost shell; also called families
  8. 14. A number placed in front of a chemical symbol or formula that represents the number of molecules
  9. 15. A neutrally charged subatomic particle located in the nucleus of an atom; contributes to the mass of the atom
  10. 18. An insoluble solid formed from a chemical reaction
  11. 19. A chemical bond between atoms (one metal, one non-metal) in which one atom transfers one or more electrons to the other atom
  12. 22. The smallest particle of an element; made of electrons, protons, and neutrons
  13. 23. The rows in a periodic table that classify the elements by the number of electron shells
  14. 24. A pure substance composed of the same type of atom throughout