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