Across
- 2. review-an expert analysis of experimental results, completed to allow for other scientists to look for flaws, re-test results, and evaluate validity of the results
- 5. number-the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table (also equals the number of electrons in an element)
- 7. pure substance that consists entirely of one type of atom
- 10. a well-tested explanation unifies a broad range of observations
- 11. experiment-An experiment where only one variable is changed.
- 17. charged particle that orbits the nucleus in the electron cloud
- 18. positively charged particle found in the nucleus of an atom
- 19. symbol- one- or two-letter abbreviation for a chemical element name
- 24. A scientific explanation for a set of observations.
- 26. attraction between molecules of the same substance
- 29. variable-the one variable that is altered
- 31. in a molecule, uneven distribution of electrons (results in (+) and (-) poles) ex. water
Down
- 1. using senses to collect information about your surroundings
- 3. Organized way of gathering and analyzing evidence about the natural world
- 4. electron- electron found in the outermost shell of an atom; helps to determine bonding
- 6. found in the nucleus that has no charge
- 8. variable- the variable that changes in response to the independent variable
- 9. logical interpretation based on what scientists already know
- 12. bonding-- weak attraction between a hydrogen atom and another atom
- 13. a combination of 2 or more elements connected by bonds
- 14. force of attraction between different kinds of molecules
- 15. bond- type of bond between atoms in which the electrons are shared
- 16. action-- tendency of water to rise in a thin tube
- 20. mass-equal to the total number of protons and neutrons in the nucleus of an atom (based on isotopes)
- 21. basic unit of matter
- 22. group-in a scientific experiment, group where independent variable is altered
- 23. variables-all other variables that are kept the same in a controlled experiment
- 25. capacity (specific heat)-- the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C)
- 27. method- Series of steps that scientists follow to approach research
- 28. group-in a scientific experiment, group where no changes are made
- 30. (chemistry definition) the center of an atom, which contains the protons and neutrons