Chemical Interactions Vocabulary

Investigation #1 Substances

1. Chemistry The study of substances and their interactions.

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

3. Substances More than one substance.

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

5. Particle The smallest piece of any substance.

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

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

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

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

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.

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

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

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

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

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

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

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

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