7.2 Writing Chemical Equations By: Jake Poserina and Tyler Dunphy.
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Transcript of 7.2 Writing Chemical Equations By: Jake Poserina and Tyler Dunphy.
7.2 Writing Chemical Equations
By: Jake Poserina and Tyler Dunphy
What is a Chemical Equation?
• A Chemical Equation is an expression representing a chemical reaction
• The reactants on the left and the formula of the products on the right
• These reactants are connected by an arrow called a yield
• Ex. Fe + O₂ → Fe₂O₃
Symbols Used In Chemical Equations
Skeleton Equations
• A Skeleton Equation is a chemical equation that does not indicate the relative amounts of the reactants and products. Use (s) for soled, (l) for a liquid, (g) for a gas, (aq) for an aqueous solution.
Catalysts
• A catalyst is a substance that speeds up a reaction without being used up.
• Because a catalyst is neither a reactant nor a product, its formula is written above the arrow in a chemical equation.
MnO₂ H₂O₂→H₂O(l)+O₂(g)
Question 1
Write a skeleton equation for this chemical reaction: when calcium carbonate is heated,
calcium oxide and carbon dioxide are produced.
∆
CaCO₃(s)→CaO(s)+CO₂(g)
Question 2
Solid sulfur burns in oxygen gas to form sulfur dioxide gas.
S+O₂→SO₂
Oxygen gas can be made by heating potassium chlorate in the presense of the catalyst manganese (IV) oxide. Potassium chloride is left as a solid residue.
A. CaCO₃(aq)→CaO+CO₂
B. KClO₃→KCl+MnO₅
C. KClOMn→ClO+KMn
D. KClO₃+MnO₂→KCl+MnO₅
When solid mercury(II) sulfide is heated with oxygen, liquid mercury metal and gaseous sulfur dioxide are produced
A. HgS+O₂→Hg+SO₂
B. HgS→Hg+SO₂
C. HgSO→Hg+SO
Shout out to my favorite teacher @scottsweeten! #scienceproject
Mr. Sweeten’s class unit 7.2
Tyler Dunphy & Jake Poserina
Homework:Write a Vendiagram on the difference's of skeletal equations, and regular chemical equations.