Across
- 3. Atoms of the same element that differ in the number of neutrons they contain.
- 4. Network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem.
- 5. Weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in PH
- 9. Collection of all the organisms that live in a particular place, together with their nonliving environment.
- 11. The smallest unit of most compounds.
- 12. A pure substance that consists entirely of 1 type of atom
- 13. Positively and negatively charged atoms.
- 15. Organism that feeds on plant and animal remains and other dead matter.
- 18. A compound that produces hydroxide ions in solution.
- 20. A negatively charged particle (-).
- 21. Organism that obtain energy by eating animals.
- 22. When electrons are shared between atoms.
- 24. Process by which plants and some other organisms use light energy to convert H2O and CO2 into O2 and sugars and starches.
- 25. Chemists devised a measurement system.
- 27. Organism that contains energy from the food it consumes; also called a consumer.
- 29. Mixture of two or more substances in which the molecules of the substance are evenly distributed.
- 30. A substance formed by the chemical combination of two or more elements in definite proportions.
- 31. The substance in which the solute dissolves.
- 32. Any compound that forms H+ ions in solution.
- 33. Organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer.
- 34. Scientific study of interactions among organisms and between organisms and their environment.
- 35. Group of ecosystems that have the same climate and dominant communities.
Down
- 1. Assemblage of different populations that live together in a defined area.
- 2. Part of Earth in which life exists including, land, water, and air or atmosphere.
- 6. Group of similar organisms that can breed and produce fertile offspring.
- 7. A material composed of two or more elements or compounds that are physically mixed together but not chemically combined.
- 8. The center of the atom which contains the protons and neutrons.
- 10. Mixture of water and non dissolved materials.
- 13. Formed when 1 or more electrons are transferred from one atom to another.
- 14. Step in a food chain or food web.
- 16. Organism that breaks down and obtain energy from dead organic matter.
- 17. Basic unit of matter.
- 19. Process by which some organisms use chemical energy to produce carbohydrates.
- 21. An attraction between molecules of the same substance.
- 23. The substance that is dissolved.
- 24. Group of individuals of the same species that live in the same area.
- 26. Series of steps in an ecosystem in which organisms transfer energy by eating and being eaten.
- 27. Organisms that obtain energy by eating only plants.
- 28. Organism that obtain energy by eating both plants and animals.
- 33. An attraction between molecules of different substances.