Across
- 3. change of state from solid to a gas
- 4. positively charged centre of an atom; contains protons and neutrons
- 6. chemical reaction that absorbs energy
- 7. property that describes the physical appearance and composition of a substance
- 9. refers to three common states in which matter can exist: solid, liquid, and gas
- 10. dull,brittle element that does not conduct electricity
- 11. cloudy mixture in which tiny particles of one substance are held within one another, and the particles can be separated out
- 12. positively charged particle in the nucleus of an atom
- 14. a table in which the elements are organized by their physical and chemical properties
- 16. group 17 elements in the periodic table; the most reactive non-metals
- 17. change of state from a solid to a liquid
- 18. substance that helps a chemical reaction to proceed more quickly
- 19. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
- 20. a system of easy-to-see warning symbols on hazardous materials
- 21. group 1 element in the periodic table, not including hydrogen; most reactive of the metals
- 25. element that has both metallic and non-metallic properties
Down
- 1. characteristic that describes a particular substance
- 2. pure substance formed when at least one metal and one non-metal combine
- 5. homogeneous mixture; mixture of two or more pure substances that looks like one substance
- 8. combination of symbols that represent a compound
- 13. characteristics that can be used to describe a substance
- 15. an experiment in which one or more products of chemical reaction can escape
- 22. the smallest part of an element that is representative of the element
- 23. is anything that has mass and occupies space
- 24. fourth state of matter