Answers to the unit review on Elementary my dear Watson
Crossword:
1. atom 2.carbon 3. chemical 4.conservation 5. electrons 6. element 7. mass 8.matter 9.molecule 10. number 11. protons 12. period 13. physical
Unit Review
1.atoms 2. negative, positive, no (or neutral) 3. 1 4. families, periods
5. - atomic number
- chemical symbol
- chemical name
- atomic mass
6. chemical symbol Cl number of protons 17
atomic number 17 number of electrons 17
atomic mass 35 amu number of neutrons 18 (not on the test)
7. compounds MUST have all different atoms like H2O.... all the atoms are different. A molecule can be simple, contain the same atoms ex: O3
8. Na: sodium (1 atom) H: hydrogen (1 atom) C: carbon (1 atom) O: oxygen (3 atoms)
9. draw 2 white circles attached to 2 red circles
10. chemical change: the substances reacting are changing nature and are not reversible.
physical change: the substances are NOT changing nature and reversible (only in a change of state)
11. production of a gas, production of heat, production of light, change of color, production of a solid
12. chemical change: there's a change of color, and it is not reversible... also a new substance is created (burned toast)
13. They are made of different liquids. Different liquids means different atoms.Which means different masses.
