1. Chemical Interactions Vocabulary

2. Investigation #1 Substances

3. 1. Chemistry The study of substances and their interactions.

4. 2. Substance A unique form or type of matter. --- there are millions of different substances on Earth. --- substances are made entirely of atoms.

5. 3. Substances More than one substance.

6. 4. Mixture Two or more substances mixed together, not chemically combined. ---- a mixture can be separated.

7. 5. Particle The smallest piece of any substance.

8. 6. Chemical Reaction The process in which substances are transformed into different (new) substances.

9. 7. Chemical Name A way for scientists to refer to a particular substance using words that describe what the substance is made of. Example = Sodium Chloride

10. 8. Chemical Formula A way for scientists to refer to a particular substance using symbols (a type of code) that describe what the substance is made of. Example = NaCl

11. 9. Properties What can be observed about a substance such as color, smell, boiling point, melting point, texture, hardness, luster, and chemical reactivity.

12. 10. Dissolve To cause a solute (white powder in our case) to pass into solution (the mixture of water and the white powder). --- Dissolving is basically when a substance “hides” in another substance. Salt can dissolve in water. The water is obviously present; the salt is also identified if you were to taste the solution. The salt is “hiding” in the water.

13. 11. Atoms The tiny pieces that all matter – all the stuff in the world – is made of.

14. 12. Scientific Argumentation A process used to convince others using evidence and reasoning.

15. 13. Claim A proposed answer to a question about the natural world.

16. 14. Evidence Information about the natural world used to support or refute a claim.

17. 15. Product The substances that are produced when atoms rearrange during a chemical reaction.

18. 16. Reactants The substances whose atoms rearrange during a chemical reaction

19. 17. Endothermic Reaction A type of chemical reaction that gathers energy from its surroundings and stores it away.

20. 18. Exothermic Reaction A type of chemical reaction that releases stored energy.