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Across 2. substances that are formed during a chemical reaction 4. consisting of two of the same elements bonded together ex. H2 5. (cr) means this when written after a chemical formula 7. a group of atoms that acts as a unit and has a positive or negative charge 12. a solid that forms and settles out of a solution 14. the smallest particles of matter that retains its identity in a chemical reaction 17. A representation of a chemical reaction 18. a type of reaction in which one element replaces another element in a compound 20. a chemical equation with the same number and types of atoms on both sides of the yields arrow 22. a chemical equation that does not indicate the amounts of reactants or products 23. a quantity that is conserved during a chemical reaction 24. a symbol used to separate two reactants or two products 25. small whole numbers that are placed in front of the formulas to balance the equation 26. a type of reaction that forms only one product

Down 1. substances that are present at the beginning of a reaction 3. a chemical change involving an exchange of positive ions between two compounds 6. a type of reaction in which a single reactant forms two or more simpler products 8. a symbol used to separate the reactants from the products 9. an expression that indicates the number and types of atoms present in a substance 10. a chemical change involving oxygen as a reactant and produces heat and light 11. describes a chemical reaction that releases heat energy 13. a chemical change that produces new substances 15. a substance that has been dissolved in water 16. describes a chemical reaction that absorbs heat energy 19. a substance that speeds up a chemical reaction 21. the coefficients in a balanced chemical equation indicate the number of molecules or this chemical quantity