COUNTING ATOMS

Apr 26, 2013

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RULES FOR COUNTING ATOMS. SUBSCRIPTS only refer to the atom that they are BEHIND. For example

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COUNTING ATOMS

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Counting Atoms!!

Counting Atoms!!. Oct 5 th 2012. Reactants and Formulas. Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products. The law of Conservation of Mass- the mass of substances in a closed system will remain constant, no matter what processes are acting inside the system.

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Counting Atoms

Counting Atoms. If there are no numbers , there is only one atom of each element present. Ex: LiBr Li: 1 Br: 1. If there is a number and only one element , there are that many atoms of that element. Ex: O 2 O: 2.

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3.3: Counting Atoms

3.3: Counting Atoms. How do I count and calculate the mass of atoms?. Counting Atoms. Atoms are far too small to be counted individually, so we use the concept of a weighted average. Suppose you need 1000 mints. Each mint weights 1 gram. How could you gather 1000 mints

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Counting Atoms

Counting Atoms. How to count atoms. 2H 2 O. COEFFICIENT. SUBSCRIPT. 2H 2 O. The coefficient gets applied to the ENTIRE formula -this means that there are 2 molecules of water present! -you MULTIPLY this number by every subscript in the formula. 2H 2 O.

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Counting Atoms

Counting Atoms. 3.3. Counting Atoms. Very difficult to count Atomic Number – # of p + of each atom of that element Whole numbers Elements arranged by atomic # Identifies the element. Isotopes. Isotope – an atom of the same element with different # of neutrons

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Counting Atoms

Counting Atoms. Co CO CO 2 C 6 H 12 O 6 Mg(NO 3 ) 2 How many atoms are there in 5 molecules of Mg(NO 3 ) 2 ? …5 molecules of C 6 H 12 O 6 ?. Bring: Calculator Periodic table EVERY DAY. Masses of atoms. Atoms are so tiny; how do we give their masses?

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3.3 Counting Atoms

3.3 Counting Atoms. Counting Atoms. Isotopes. Atoms of the same element with different masses Isotopes do not differ significantly in their chemical behavior Writing Isotopes: Hyphen notation: element-mass # (hydrogen-3) Nuclear symbol: 235 U. 92. Atomic Mass.

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Counting Atoms

Counting Atoms. Atomic Number. Atoms of different elements have different numbers of protons . Atoms of the same element all have the same number of protons . The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element.

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Counting Atoms

Counting Atoms. No worries!. Refresher…. Subscript… = H+H = H+H+O = H+H+S+O+O+O+O. Refresher…. = Ca +(O+H)+(O+H) Ca+O+O+H+H. Refresher…. = H+H+O+H+H+O. Try this…. = = = = Mg=3 P=2 O=8 3+2+8= 13 Atoms in. Try this…. = = =

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Counting Atoms

Counting Atoms. How do we know how many we have if they are so small?. Relative Mass Scale. In the Bean Counting Lab, we set up a scale to help “count” large amounts of something, without having to actually count them Because that can be a pain in the butt, as you saw yesterday

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Counting Atoms

Counting Atoms. Subscripts tell how many atoms of each element are present If formula has parenthesis or number in front , use the distributive property (like in math class) MgCl 2 H 2 O C 6 H 12 O 6. 2H 2 SO 4 Ba(NO 3 ) 2 Mg(C 2 H 3 O 2 ) 2 4NaCO 3. (NH 4 ) 2 O 2Fe(NO 3 ) 2

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Counting Atoms

Counting Atoms. Chemistry is a quantitative science - we need a "counting unit." The MOLE 1 mole is the amount of substance that contains as many particles (atoms or molecules) as there are in 12.0 g of C-12. AvogadroPaper. The Mole is Developed. Avogadro’s number.

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Counting Atoms

Counting Atoms. Chemistry is a quantitative science—we need a “counting unit.”. MOLE - 1 mole is the amount of substance that contains as many particles (atoms, molecules) as there are in 12.0 g of 12C. Avogadro’s Number. 6.02214199 x 10 23.

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COUNTING ATOMS

COUNTING ATOMS. RULES FOR COUNTING ATOMS. SUBSCRIPTS only refer to the atom that they are BEHIND . For example… H 2 S There are TWO atoms of HYDROGEN and only ONE atom of SULFUR. COEFFICIENTS.

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Counting Atoms

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COUNTING ATOMS

COUNTING ATOMS. A. C. B. Vocabulary:. A. CHEMICAL FORMULA is the elements that make-up a compound or molecule. Chemical Formula. A. C. B. Vocabulary:. SUBSCRIPTS determines the number of ATOMS; small number. IF THERE ISN’T A NUMBER, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!.

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Counting Atoms

Counting Atoms. Vocabulary and Steps. Chemical Symbol. Usually a one- or two-letter set of characters that is used to identify an element. Examples: H, He, Ne, W, Li, Ag. Compound Formula. A combination of symbols that shows the ratio of elements in a compound.

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Counting Atoms

Counting Atoms. Counting Atoms. Subscript: the small # after an element symbol. Tells how many atoms there are of that element. Coefficient: the large # before a compound. Tells how many molecules there are. Coefficient. Subscript. 3CaCl 2. Counting Atoms. What is the coefficient?.

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