Across
- 4. A change that occurs when one or more substances change into entirely new substances with different chemical and physical properties
- 7. A change in global or regional climate patterns, due largely to the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels
- 8. Receives the most direct sunlight on Earth
- 10. Living or once living parts of an ecosystem (ex. animals, bacteria)
- 12. A state of matter that HAS a definite shape and a definite volume
- 14. Sugar, manufactured during photosynthesis, main source of energy for plans and animals, metabolized during cellular respiration
- 15. Smallest piece of an element that still represents that element
- 18. The process in which carbon dioxide is released by exhaling, and oxygen is taken in during inhaling (breathing)
- 21. A substance produced after a chemical reaction occurs
- 22. The process by which plants make their own food using the sun's energy to convert water and carbon dioxide into sugars
- 23. A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound
- 24. Electrons on the outermost energy level of an atom that participate in chemical bonding
- 25. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
- 26. The process of a liquid changing into a gas at the surface of the liquid
- 28. A chemical substance that is present at the start of a chemical reaction
- 30. The rise in Earth's average surface temperature during the past 100 years
- 31. Caused by the tilt of the earth's axis and revaluation around the sun
- 32. The two days of the year on which neither hemisphere is tilted toward or away from the sun
Down
- 1. A group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound
- 2. The spinning of Earth on its axis, also causes day and night
- 3. Gases such as carbon dioxide, methane, nitrous oxide, water vapor, and ozone in the atmosphere which are involved in the greenhouse effect
- 5. Pure substance containing only one kind of atom
- 6. The Law that states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction
- 9. The change of state from a gas to a liquid
- 11. Number never changes and helps identify an atom/positive charge
- 13. A state of matter that has a definite volume but no definite shape
- 16. Water in liquid or solid form, that falls from the atmosphere
- 17. Subatomic particle with a negative charge and almost no mass
- 19. Nonliving parts of an ecosystem (ex. sunlight, water)
- 20. A change in the size, shape, form, or state of matter that does not change the matter's identity
- 27. An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
- 29. Substance containing two or more kinds of elements