Chemical Equations
*Show the formulas for substances undergoing a chemical change
*Also shows the number and kind of atoms that start out and the rearrangement of atoms to form new substances.
5 Parts of a Chemical Equation
o Reactants- Starting material
o Products- Substances produced or made after the chemical reaction
o Yield Sign- means “yields” or “produces”. Indicates the change of starting material to products
o Coefficients- whole numbers used at the beginning of a substance which indicates how many of that substance is needed in the reaction
o State of Matter- a subscript at the end of the substance, which tells what state of matter the substance in a chemical equation, is in.
(s)=Solid (g)= Gas (l)= liquid (aq)= aqueous which means “dissolved in water
Law of Conservation of Matter: Matter is neither created nor destroyed but rather is rearranged or changed to form new substances.
Balancing Chemical Equations: Examples for the board
1. Fe (s) + Cl2(g) FeCl3(s)
2. NaOH (aq) + CaBr2 (aq) Ca(OH)2(s) + NaBr(aq)
3. C2H6(l) + O2(g) CO2(g) + H2O(l)
4. NaN3(s) Na(s) + N2(g)
Chemical Equations
*Show the formulas for substances undergoing a chemical change
*Also shows the number and kind of atoms that start out and the rearrangement of atoms to form new substances.
5 Parts of a Chemical Equation
o Reactants- Starting material
o Products- Substances produced or made after the chemical reaction
o Yield Sign- means “yields” or “produces”. Indicates the change of starting material to products
o Coefficients- whole numbers used at the beginning of a substance which indicates how many of that substance is needed in the reaction
o State of Matter- a subscript at the end of the substance, which tells what state of matter the substance in a chemical equation, is in.
(s)=Solid (g)= Gas (l)= liquid (aq)= aqueous which means “dissolved in water
Law of Conservation of Matter: Matter is neither created nor destroyed but rather is rearranged or changed to form new substances.
Balancing Chemical Equations: Examples for the board
1. Fe (s) + Cl2(g) FeCl3(s)
2. NaOH (aq) + CaBr2 (aq) Ca(OH)2(s) + NaBr(aq)
3. C2H6(l) + O2(g) CO2(g) + H2O(l)
4. NaN3(s) Na(s) + N2(g)