Across
- 3. A starting substance in a chemical reaction.
- 7. The smallest unit of an element.
- 9. A pure substance made of only one kind of atom.
- 11. Relating to chemistry or the interactions of substances.
- 14. A neutral particle in the nucleus.
- 18. A substance that changes color in acids or bases.
- 19. Time taken for half of a radioactive substance to decay.
- 21. A substance with a pH more than 7.
- 22. Splitting of a heavy nucleus into two smaller ones.
- 25. An element that is typically shiny and conducts electricity.
- 26. A chemical reaction with oxygen that produces heat and light.
- 27. A substance made of two or more elements chemically combined.
- 28. Combining of two light nuclei into a heavier one.
- 29. A negatively charged particle orbiting the nucleus.
Down
- 1. Radiation that involves the emission of an electron.
- 2. A substance formed in a chemical reaction.
- 4. Type of reaction that involves changes in the nucleus.
- 5. High energy electromagnetic radiation from a nucleus.
- 6. A substance with a pH of 7.
- 7. A type of radiation consisting of 2 protons and 2 neutrons.
- 8. A positively charged particle in the nucleus.
- 10. A reaction that absorbs heat.
- 12. An atom or molecule with a charge.
- 13. Two or more atoms chemically bonded together.
- 15. An unstable isotope that emits radiation.
- 16. A compound that reacts with acids to release CO₂.
- 17. A substance with a pH less than 7.
- 20. Atoms of the same element with different numbers of neutrons.
- 23. A process in which substances change into new ones.
- 24. A reaction that releases heat.