Across
- 2. A reaction where two or more substances combine to form one
- 7. The substances that are present before a chemical reaction
- 9. A shorthand representation of a compound is called a chemical _____
- 11. A combination of two or more substances that are not chemically combined
- 13. A pure substance made of two or more elements chemically combined
- 14. A number in a chemical formula that shows how many atoms of an element are present
- 17. A substance made of two or more types of atoms bonded together
- 19. A change that alters the form or appearance of a material but does not make the material into another substance _____ change
- 20. A substance that slows down or stops a reaction
- 21. A large number placed in front of a chemical formula to show how many molecules there are
- 23. A protein that acts as a biological catalyst
- 26. Energy needed to get a reaction started is the ____energy
- 27. A measure of how much solute is dissolved in a solvent
- 28. A combination of letters that represents an element
Down
- 1. A solid that forms from a solution during a chemical reaction
- 3. A shorthand way to show a chemical reaction, using symbols is called a chemical _____
- 4. Something that is burned to produce energy
- 5. A substance that increases the rate of a reaction without being used up
- 6. The substances formed from a chemical reaction
- 8. A substance made of only one kind of atom
- 10. A reaction in which compounds break down into simpler substances
- 12. A force that holds atoms together is a chemical _____
- 15. A reaction in which one element replaces another in a compound
- 16. A type of chemical reaction that releases energy
- 18. The process where substances change into different substances is a chemical _____
- 22. A reaction that absorbs energy
- 24. The smallest part of an element that still has the properties of that element
- 25. The principle that mass is not lost or gained during a chemical reaction is the law of conservation of _____