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Brain Teaser
Identify the type of reaction: H2 + O2 H2O CaSO4 + KOH Ca(OH) 2 + K2SO4
KClO3 KCl + O2
AgNO3 + Cu Cu(NO3) 2 + Ag
Write the chemical equation: Magnesium reacts with chlorine gas in the
air to form magnesium chloride
Agenda
Brain Teaser Review Types of Reactions Notes: Balancing Equation Cool Chemical Reactions Mini-Lab Homework
Complete Reaction Types Worksheet 1 Balance Equations in Lab Packet
Review
4 Types of Chemical Reactions Synthesis: A + B AB (1 product) Decomposition: (1 reactant) AB A + B Single replacement: X + AB XB + A Double replacement: AB + XY AY + XB
Balancing Equation
Word Equations Describes a chemical reaction that occurs
using the names of the chemicals involved. Reactants versus Products An arrow is written between the reactants
and products to indicate that chemical change is occurring For example: 2H2 + O2 2H2O
Balancing Equation
Atoms involved in a chemical reaction must be balanced. Same number of atoms of each element on both
sides of a chemical equation. Unbalanced equation
Balance the equation by adding coefficients in front of the compounds Coefficients: number of molecules of a particular
compound Subscripts: number of atoms of each element in the
compound
Balancing Equation
A. Write the word equationB. Write the CORRECT formula for all reactants
and productsC. Balance the equation by using coefficients
1. NEVER change the subscripts in the formula to balance the equation
2. Elements need to be balanced from either side of the equation
3. Start with the first element and work right of the equation
4. Balance the number of oxygen and hydrogen atoms after all the other elements have been balanced.
5. Go back and double check that all elements are balanced
6. BOX your coefficients when finished7. USE PENCIL only!
Balancing Equation
Inspection Method Aluminum reacts with oxygen to produce
aluminum oxide
Chlorine reacts with lithium bromide to produce lithium chloride and bromine gas
Balancing Equation
Algebraic Method Aluminum oxide reacts with sodium phosphate
to produce aluminum phosphate and sodium oxide
Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas
Practice Problems
___Ca(CN)2 + __AlF3 __CaF2 + ___Al(CN)3 Potassium phosphate + Calcium hydroxide Calcium phosphate + Potassium
hydroxide
Cool Chemical Reactions
Objectives: Write 4 chemical equations to explain the chemical
reactions Balance the equations Record qualitative observations
Procedures: Read each procedure carefully before beginning.
Goggles are required! Restore Station Before Switching DO NOT dump any chemicals down the sink
Waste Waste Container DO NOT cross contaminate chemicals Burning Split Test
Oxygen Gas Carbon Dioxide Gas Hydrogen Gas
Cool Chemical Reactions
Station 1: The Sparkler Hold Mg strip with tongs and ignite with Bunsen
burner Station 2: The Fire Extinguisher
Place 1 little scoop of sodium bicarbonate (2 cm deep) into a test tube
Add drops of HCl slowly into the test tube (fizz) Have a burning splint ready to test for the gas
produced Discard solution into the sink and was clean test
tube
Cool Chemical Reactions
Station 3: Spy Writing Dip one end of Q-tip in lead (II) nitrate Draw and Let it Dry Dip other end of Q-tip in potassium iodide Wipe over writing. Let it dry Dipose Q-tip in Waste Container. Wash your
hands! DO NOT TOUCH the chemicals on the paper!
Cool Chemical Reactions
Station 4: Hear it Pop Add a piece of Mg ribbon into a test tube Add 1 pipette full of 3M hydrochloric acid Immediately place a stopper on the test tube
to collect the gas produced Have a burning splint ready to test for the
gas produced. Remove the stopper and test for gas
DO NOT submerge splint into the liquid (DEMO)
Discard content into Waste Beaker
Cool Chemical Reactions
A. Procedure (NEED TO WEAR GOGGLES!)
B. Observations: Refer to Handout C. Write the chemical equation and
BALANCE! Don’t forget Cl2, I2, F2, Br2, O2, H2, N2
D. Refer to the handout