Chapter 4 vocabulary words

Edit Answers
1234567891011121314151617181920
Across
  1. 4. A is any change that alters the form or appearance of a substance but does not change into another substance.
  2. 6. In a matter does not enter or leave
  3. 8. A change in matter that produces one or more substances is a
  4. 9. In an ,the energy released as the products form is greater than the energy required to break the bonds of the reactants
  5. 11. A increases the reaction rate by lowering the activation energy needed
  6. 14. A is the amount of a substance in a given volume
  7. 18. A reaction occurs when compounds break down into simpler product
  8. 20. In an ,more energy is required to break the bonds of the reactants than is released by the formation of the products
Down
  1. 1. If two elements in different compounds trade places
  2. 2. When two or more elements or compounds combine to make a more complex substance
  3. 3. A is the minimum amount of energy needed to start a chemical
  4. 5. A is a way to show a chemical reaction using symbols instead of words
  5. 7. A state that during a chemical reaction matter is not created or destroyed
  6. 10. A is a solid that forms from liquids during a chemical reaction
  7. 12. In a matter can enter from or escape to the surroundings
  8. 13. The cells in your body contain thousands of biological catalysts called
  9. 15. Substances that undergo the chemical changes are called
  10. 16. The new substances that form are the
  11. 17. A is a number placed in front of a chemical formula in a equation
  12. 19. A material used to decrease the rate of a chemical reaction is an