Science 7: Crossword Puzzle 1

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Across
  1. 2. A state of matter that has no definite shape or volume. It expands to fill the shape and volume of its container.
  2. 6. A state of matter similar to gas but with some of its particles electrically charged. It is found in stars and lightning.
  3. 7. A group of two or more atoms bonded together, representing the smallest unit of a chemical compound that can take part in a chemical reaction.
  4. 10. The process in which a gas cools and changes into a liquid.
  5. 12. A model or imitation of a real-world process used to study or explain how something works.
  6. 13. Anything that has mass and takes up space. It exists in three main states: solid, liquid, and gas.
Down
  1. 1. The process in which a solid changes directly into a gas without passing through the liquid state.
  2. 3. The smallest unit of an element that maintains the properties of that element. It is the basic building block of matter.
  3. 4. The transformation of a substance from one state of matter (solid, liquid, gas) to another.
  4. 5. A state of matter that has a definite volume but no fixed shape. It takes the shape of the container it is in.
  5. 6. A tangible, 3D representation of an object or system used to study or demonstrate its properties.
  6. 8. The process in which a liquid changes into a gas, usually when heated.
  7. 9. The process in which a gas changes directly into a solid without passing through the liquid state.
  8. 11. A state of matter that has a definite shape and volume, with particles closely packed together.