Whenever chemists observed atoms reacting with each other, they noticed that the sum of their group numbers usually equaled eight, or multiples of 8 (16, 24, 32, 40, etc.). This is called The Rule of Eight. How does this Rule of Eight work in understanding chemical formulas? 2. Chemical formulas are written to show how many atoms of each element are bonded together to make a molecule of a substance. For example, C6H12O6 is the chemical formula for one molecule of sugar. 3. Look at water: H20. By looking at this formula, you know that it takes _____ hydrogen atom(s) to bond with _______ oxygen atom(s).
1. Whenever chemists observed atoms reacting with each other, they noticed that the sum of their group numbers usually equaled eight, or multiples of 8 (16, 24, 32, 40, etc.). This is called The Rule of Eight. How does this Rule of Eight work in understanding chemical formulas?
2. Chemical formulas are written to show how many atoms of each element are bonded together to make a molecule of a substance. For example, C6H12O6 is the chemical formula for one molecule of sugar.
3. Look at water: H20. By looking at this formula, you know that it takes _____ hydrogen atom(s) to bond with _______ oxygen atom(s).
4. Now, add the group numbers. Hydrogen has a group # of 1A. Oxygen has a group number of 6A. Two hydrogens (1 + 1) and one oxygen (6) equals a total of 8. The Rule of Eight!5. Try another simple one, table salt (sodium chloride, NaCl). The formula tells you that it takes ______ sodium atom(s) to bond to ______ chlorine atom(s). Add the group numbers: The group # for sodium is 1A and the group # of chlorine is 7A. 1 + 7 = 8. The Rule of Eightagain!
6. Try this one on your own. Go back to the sugar molecule: C6H12O66 atoms of carbon (group # _____ ) 6 x ______= _______12 atoms of hydrogen (group # ______ ) 12 x ______= _______6 atoms of oxygen (group # _____ ) 6 x.______= _______Total = _______Fill this in: Is the total of __________ a multiple of 8? ___________ If so -The Rule of Eight again!
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