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8. breaking a compound into its basic elements. (13 letters)
10. to determine the molecular formula, you must be given the ______(9 letters)
11. the "backbone" formula(9 letters)
12. an aqueous solution that always has hydrogen atom to ammonia gas(4 letters)
13.the ion made by adding one extra hydrogen atom to ammonia gas(8 letters)
14.a negative ion containing oxygen covalently boded to another non-metal(8 letters)
15.combining 2 elements to make a compound.(9 letters)

DOWN
1.what happens when hydrogen is ignited in the presence of oxygen (9 letters)
2. Sherlock found that the poison was ______(8 letters)
3. a reaction that always involves combining with oxygen (10 letters)
4. the "real" formula(9 letters)
5. a method of decomposing water(12letters)

Hi Steve.

Rather than post the same questions over several threads, Christina has a thread for these chemistry questions ...http://www.crosswordsolver.org/forum/96481/chemistry-worksheet">click here.

Also, why not bounce ideas off each other via e-mail, msg, phone, twitter or txt (or even, dare I say it, face-to-face)?

JimC
P.S. When someone gives an answer you could always check it out to understand if & why it's the right answer.