Unit 2 Science Voabulary

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Across
  1. 2. An atom or group of atoms that has a positive or negative charge as a result of the loss or gain of an electron(s)
  2. 6. A chemical bond that involves the sharing of electron pairs between atoms
  3. 8. A change in a substance that affects its state of matter, but not its chemical makeup
  4. 13. A chemical change that happens when two or more elements combine or rearrange to form a new element
  5. 14. A hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons. Due to its properties being very different from regular gasses, it is sometimes referred to as the fourth state of matter
  6. 15. A covalent bond in which two atoms share a pair of electrons
  7. 16. A number assigned to an element in chemical combination that represents the number of electrons lost (or gained, if the number is negative) by an atom of that element in the compound
  8. 17. The transition of an element from a solid to a gas, without transitioning to a liquid first
  9. 18. point The temperature at which the vapor pressure of a liquid element equals the pressure surrounding the liquid
Down
  1. 1. A substance that forms as a result of a chemical reaction
  2. 3. point The temperature at which the solid form of an element becomes a liquid.
  3. 4. A chemical bond formed between two ions with opposite charges. A chemical bond formed between two ions with opposite charges. Atoms may share
  4. 5. A substance that takes part in and undergoes change during a reaction.
  5. 7. A (usually irreversible) change in a substance that rearranges its atomic structure and therefore it’s chemical and physical properties
  6. 8. bond Covalent bond between two atoms in which electrons are shared unequally
  7. 9. Two or more atoms bonded together, the smallest unit of a chemical compound that can take part in chemical bonding
  8. 10. A substance composed of exactly two elements that cannot be simplified by any further means
  9. 11. A set of chemical symbols showing the elements present in a compound and their relative proportions
  10. 12. An ion comprised of two or more atoms.
  11. 13. Chemical atoms being held together by a strong force of attraction