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These questions and answers are provided as sample, please customize to your activity.
1. Balance and classify the equation for Mg + O2 magnesium oxide.
2Mg + O2 2 MgO; Synthesis
2. Critical Thinking: Based on your equation, would the product weigh more or less than the magnesium
you started with (think about the law of conservation of mass)?
The mass will be more because it's gathering mass from the air.
3. What evidence was there that a chemical reaction took place?
Light, smoke, change from shiny metal to brittle gray powder.
4. Balance and classify the following Lead(II) nitrate reacts with potassium iodide to produce lead(II) iodide
and potassium nitrate.
Pb(NO3)2 + 2 KI2 PbI2 + 2 KNO3; Double replacement
5. What evidence was there that a chemical reaction took place?
Formation of a solid
6. Balance and classify H2O2 decomposes to form water plus O2.
2H2O2 2H2O + O2; Decomposition
7. What evidence was there that a chemical reaction took place?
Temperature change, formation of a gas
8. Balance and classify Magnesium reacts with hydrochloric acid to produce magnesium chloride
and hydrogen gas.
Mg + 2 HCl MgCl2 + H2; Single replacement
9. What evidence was there that a chemical reaction took place?
Temperature change or bubbles
10. Write and balance an equation for the extra reaction that occurred during the burning splint test.
2H2 + O2 2H2O, synthesis/combustion
Types of Reactions Lab Demonstration:
Test Your Understanding Student Worksheet
Name: Class: Date:
