Chemistry

Edit Answers
12345678
Across
  1. 4. a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
  2. 5. a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
  3. 6. measure of the amount of matter in an object.
  4. 8. pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei.
Down
  1. 1. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
  2. 2. anything that has mass and takes up space (it has volume).
  3. 3. the action or process of observing something or someone carefully or in order to gain information.
  4. 7. the basic units of matter and the defining structure of elements.