Unit 7 VMO

2. States that mass of all substances present before a chemical change equals the mass of all substances remaining after the change
4. chemical reaction in which on element replaces another element in a compound
5. Any characteristic of a substance such as flammability that can be observed that produces a new substance
8. atom of an element that has a specific number of neutrons
9. attraction formed between atoms when they share electrons.
10. the force of attraction between the opposite charges of the ions in an ionic compound.
13. is a neutral particle that forms as a result of electrons sharing among atoms.
18. A type of chemical reaction that occurs when a substance reacts with the oxygen to produce energy in the form of heat and light
19. when an atom loses electrons and becomes a positively charged Ion.
20. is a charged particle that has either more or fewer electrons than protons.
21. Any characteristic of a material such as size or shape that can be observed without changing the identity of the substances stays the same
22. Shorthand Method used to describe chemical reactions.

1. Positively or negatively charged covalently bonded group of atoms
3. chemical reaction in which one or more substances changed into a new substance
6. in a chemical reaction is the substance that reacts.
7. reaction in which two iconic compounds in a solution are combined can be produce a precipitate, water, or gas
11. chemical reaction in which one substance breaks down into new substances
12. is a chemical equation that only shows the chemical formulas of the reactants and the products involved in a reaction.
14. chemical reaction in which two or more substances combine to form a different substance
15. the new substance after a chemical reaction
16. Substance in which the atoms of two or more elements are combined in fixed proportion
17. When an atom gains electrons to become a negatively charged Ion