Across
- 4. Reaction where two or more substances combine to form one product
- 6. Reaction where one compound breaks down into simpler substances
- 8. A chemical reaction that produces heat and light
- 9. Arrangement of electrons in an atom
- 10. Gas essential for combustion to occur
Down
- 1. A process in which substances change into new substances
- 2. Negatively charged particle in an atom
- 3. A pure substance made of only one kind of atom
- 5. Substance formed as a result of a chemical reaction
- 7. The loss of electrons in a chemical reaction