משואה כימית של שריפת פחם (תגובה עם חמצן)

מצגת בנושא: "משואה כימית של שריפת פחם (תגובה עם חמצן)"— תמליל מצגת:

1 משואה כימית של שריפת פחם (תגובה עם חמצן)
A chemical equation gives the chemical formulas of the reactants on the left of the arrow and the products on the right. Reactants Product O2 (g) CO2 (g) C(s)

2 הסמלים שבמשואה Symbols used in chemical equations show:
the states of the reactants. the states of the products. the reaction conditions. TABLE 5.2

3 סיכום וחזרה מהי משואה כימית
A chemical equation tells us what substances react (reactants) and what substances are formed (products).

4 משואה כימית היא מאוזנת In a balanced chemical reaction
atoms are not gained or lost. the number of reactant atoms is equal to the number of product atoms.

5 דוגמא 2 למשואה כימית מאוזנת
In a balanced chemical equation, the number of atoms in the reactants is equal to the number of atoms in the products for each element.

6 איזון משואה כימית +דוגמא 3
To balance a chemical equation, whole number coefficients are placed in front of the chemical formulas. coefficients in front of a molecule represent the multiple of that molecule needed in a balanced reaction. subscripts are never changed. Al S  Al2S Not Balanced 2Al S  Al2S3 Balanced 2 Al = Al 3 S = S

7 משואה של תגובה כימית –דוגמא 4

8 Checking a Balanced Equation
בדיקת משואה מאוזנת Checking a Balanced Equation Reactants Products balanced Atoms C 1 Atoms H 4 Atoms O

9 1 תרגיל Learning Check State the number of atoms of each element on the reactant side and the product side for each of the following balanced equations. A. P4(s) Br2(l)  4 PBr3(g) B. 2Al(s) Fe2O3(s)  2Fe(s) Al2O3(s)

10 Solution פתרון A. P4(s) + 6Br2(l)  4 PBr3(g) 4 P 4 P 12 Br 12 Br
B. 2Al(s) Fe2O3(s)  2Fe(s) Al2O3(s) 2 Al 2 Al 2 Fe Fe 3 O 3 O

11 Learning Check תרגיל 2 Determine if each equation is balanced or not.
A. Na(s) N2(g)  Na3N(s) B. C2H4(g) H2O(l)  C2H5OH(l)

12 פתרון תרגיל 2 Solution Determine if each equation is balanced or not.
A. Na(s) N2(g)  Na3N(s) No. 2 N on reactant side, 1 N on product side. 1 Na on reactant side, 3 Na on product side. B. C2H4(g) H2O(l)  C2H5OH(l) Yes. 2 C = 2 C 6 H = 6 H 1 O = 1 O דילוג על נושא שלבים באיזון משואות

13 תרגיל 3 Learning Check Check the balance of atoms in the following equation: 1. number of H atoms in products A. 2 B. 4 C. 8 2. number of O atoms in reactants 3. number of Fe atoms in reactants A. 1 B. 3 C. 4

14 פתרון תרגיל 3 Solution Check the balance of atoms in the following equation: 1. number of H atoms in products C. 8 (4H2O) 2. number of O atoms in reactants B. 4 (Fe3O4) 3. number of Fe atoms in reactants B. 3 (Fe3O4)