Reactants: Products: Definition:
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2 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties.
3 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: Products:
4 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: the starting material(s) for the chemical reaction Products:
5 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: the starting material(s) for the chemical reaction Products: the new substance(s) produced in a chemical reaction e.g. hydrogen + oxygen water
6 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: the starting material(s) for the chemical reaction Products: the new substance(s) produced in a chemical reaction e.g. hydrogen + oxygen water reactants: products:
7 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: the starting material(s) for the chemical reaction Products: the new substance(s) produced in a chemical reaction e.g. hydrogen + oxygen water reactants: hydrogen, oxygen products:
8 Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Reactants: the starting material(s) for the chemical reaction Products: the new substance(s) produced in a chemical reaction e.g. hydrogen + oxygen water reactants: hydrogen, oxygen products: water
9 Word Equations used because they show the reactants and products right away chemical reactions can be written as words reactant(s) go on the left side, product(s) go on the right side reactant(s) product(s) the arrow ( ) means yields or reacts to produce the plus sign (+) means and
10 Example 1: hydrogen gas + oxygen gas water (reactants) (product) You read this as hydrogen gas reacts with oxygen gas to produce water.
11 Example 2: Potassium iodide reacts with barium nitrate to produce barium iodide and potassium nitrate. What are the reactants in this chemical reaction? potassium iodide, barium nitrate What are the products in this chemical reaction? barium iodide, potassium nitrate Write the word equation for this chemical reaction. potassium + barium barium + potassium iodide nitrate iodide nitrate
12 A skeleton equation is a word equation written out in chemical formula. e.g. sodium reacts with chlorine gas to produce sodium chloride
13 A skeleton equation is a word equation written out in chemical formula. e.g. sodium reacts with chlorine gas to produce sodium chloride Show word equation: sodium + chlorine gas sodium chloride Show skeleton equation: Na + Cl 2 NaCl
14 NOTE: You need to figure out the correct chemical formula for EACH chemical in the word equation BEFORE writing out the skeleton equation. MAKE SURE YOU USE THE CRISSCROSS RULE!!!!!
15 Sample questions: Write the skeleton equations for the following: 1. Bromine gas reacts with magnesium chloride to produce magnesium bromide and chlorine gas. 2. Calcium phosphide reacts with sodium fluoride to produce calcium fluoride and sodium phosphide.
16 Sample questions: Write the skeleton equations for the following: 1. Bromine gas reacts with magnesium chloride to produce magnesium bromide and chlorine gas. Br 2 + MgCl 2 MgBr 2 + Cl 2 2. Calcium phosphide reacts with sodium fluoride to produce calcium fluoride and sodium phosphide.
17 Sample questions: Write the skeleton equations for the following: 1. Bromine gas reacts with magnesium chloride to produce magnesium bromide and chlorine gas. Br 2 + MgCl 2 MgBr 2 + Cl 2 2. Calcium phosphide reacts with sodium fluoride to produce calcium fluoride and sodium phosphide. Ca 3 P 2 + NaF CaF 2 + Na 3 P
18 2H 2 (g) + O 2(g) 2H 2 O (l) Reactant reacts with reactant to produce product Obeys the Law of conservation of mass Coefficient: A number in front of a chemical formula - to balance an unbalanced equation. Gives the state of reactants and products State symbols: s means solid l means liquid g means gas aq means aqueous
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