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