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1 KeslerScience.com 9/4 Bell work: Welcome back to science! Pick up the doodle notes page on elements and glue it to page 17 in your ISN. *on table at work center Complete this page for your bell work today as a review of elements. Then glue the review notes on page 19 in your ISN *I will pass this out as you are working on the bellwork J
2 REVIEW of Counting Elements and Atoms
3 I Can Today s Goals Use chemical formulas to identify substances Use chemical formulas to determine the number of atoms of each element in chemical formulas containing subscripts, coefficients, and parenthesis
4 Remember Elements A chemical that cannot be broken down into another substance Each unique capital letter represents a different element. How many elements are in glucose? Glucose C 6 H 12 O 6 3 Elements
5 Counting Elements and Atoms Atoms The smallest part of a chemical element Found on the Periodic Table Combining atoms creates molecules. Molecule of an compound (different kind of atoms) Molecule of an element (same kind of atoms)
6 Counting Elements and Atoms Formula for Molecules An expression which states the number and type of atoms present in a molecule of a substance. Molecule of an element (same kind of atoms) H 2 tells you there are 2 atoms of hydrogen. H 2 O tells you there are 2 atoms of hydrogen and 1 atom of oxygen. H 2 Molecule of an compound (different kind of atoms) H 2 O
7 Counting Elements and Atoms Adding the Subscripts How can you tell there is only one atom of oxygen in H 2 O? Subscripts The small numbers after the element s name If no subscript is present, number of atoms is understood to be one. (The one is not needed.) H 2 Molecule of an compound (different kind of atoms) Molecule of an element (same kind of atoms) H 2 O
8 Quick Action Counting Elements and Atoms Let s practice counting. Count the number of atoms in each formula using the subscript. Check your answer with a partner. CuSO 4 C 2 H 4 O 2 NH 3 CaO 4 C 4 H 10 MgBr 2
9 Counting Elements and Atoms Subscripts + Coefficients Big number at the beginning of this formula is a coefficient Involved in counting atoms Represents the number of molecules for that compound 2H 2 SO 4 Sulfuric Acid Important when balancing equations
10 Counting Elements and Atoms Calculating the number of atoms including the subscripts and coefficients. This formula means there are 2 H 2 SO 4 molecules. We know in each molecule there are: 2 hydrogens 1 sulfur 4 oxygens 2H 2 SO 4 Sulfuric Acid To find the total number of atoms, multiply each of these atoms by 2. What are the total atoms for each element in this formula?
11 Quick Action Counting Elements and Atoms Let s practice counting. Count the total number of atoms for each element in the compounds below. Check your answer with a partner. 6CuSO 4 2C 2 H 4 O 2 3NH 3 5CaO 4 4C 4 H 10 4MgBr 2
12 Counting Elements and Atoms Calculating the number of atoms including the parenthesis. This formula means aluminum is bonded to a molecule of sulfur and oxygen. We know in this molecule there are: 2 aluminums 3 sulfurs 12 oxygens Al (SO ) Aluminum sulfate To find the total number of atoms, multiply 3 by each element in the parenthesis. What is the total number of atoms for each element?
13 Quick Action Counting Elements and Atoms Let s practice counting. Count the total number of atoms in each compound using subscripts, coefficients, and parentheses. Check your answer with a partner. Ba(NO 3 ) 3 Co(NO 3 ) 2 Fe(OH) 2 (NH 4 ) 2 SO 4 Al 2 (SO 4 ) 3 Al 2 (CO 3 ) 3
14 Counting Elements and Atoms Calculating the number of atoms including subscripts, coefficients, and parenthesis. This formula means there are 2 molecules of Al 2 (SO 4 ) 3. We know in this molecule there are: 4 aluminums 6 sulfurs 24 oxygens 2Al 2 (SO 4 ) 3 Aluminum sulfate To find the total number of atoms, multiply the 3 by each element in the parenthesis. Then multiply each element by 2. What are the total atoms for each element in this formula?
15 Quick Action Counting Elements and Atoms Let s practice counting. Count the number of atoms in each formula using subscripts, coefficients, and parenthesis. Check your answer with a partner. 2Ba(NO 3 ) 3 4Co(NO 3 ) 2 3Fe(OH) 2 2(NH 4 ) 2 SO 4 2Al 2 (SO 4 ) 3 3Al 2 (CO 3 ) 3
16 I Can Check for Understanding Recognize that chemical formulas are used to identify substances? Recognize that chemical formulas determine the number of atoms of each element in chemical formulas containing subscripts, coefficients, and parenthesis?
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