Reactions
Vocabulary:
 Exothermic ReactionHeat Energy is released during a chemical reaction |  Chemical ChangeChemical bonds are broken or changed |  Endothermic ReactionHeat Energy is absorbed during a reaction |
|---|---|---|
 Physical ChangeChanging the shape or phase without changing the chemical bonds |
Day 1: Chemical & Physical Changes
Starter Questions:
Vocabulary
On this day we went through a series of demonstrations that helped us to better understand Chemical and Physical Change
Day 3: Candle Lab
1. What is needed for a substance to change phase?
2. What are the bubbles in a boiling pot of water made of?
Today we looked at how materials changed between the physical states of matter. Here are the results that we found for the candle lab.
Day 2: Boiling water
Starter Questions:
1. Define chemical change, give an example
2. Define physical change, give an example
3. Is fire a substance? Explain.
Day 4: Exothermic and Endothermic
Starter Questions:
1. An experiment produced 4 grams of solid, 2 grams of liquid and 1.5 grams of gas. How many grams of reactant had to be used?
2. What are two things that chemical reactions produce?
Today we did two experiements to look at how energy changes in different reactions. Here are the lab procedures used.
Lab Questions: How do different reactions affect the Temperature of the solution?
Experiment #1:
- 25 ml of Citric Acid
- Small amount of Baking soda
1. Set the thermometer into the citric acid and measure the tempurature.
2. Add the Baking soda
3. Record the tempurature change every 30 seconds for 4 minutes
Experiment # 2
- 15 ml of Vinegar
- small ball of steel wool
- styrofoam cup and plastic wrap
1. Wrap ball of steel wool around the bottom of the thermometer and measure the tempurature.
2. Place steel wool, thermometer, and vinegar into the cup, cover.
3. Wait one minute and then pour out the vinegar.
4. Record the change in tempurature every 30 seconds for 4 minutes
Today we are looking at the energy change that occurs in a Chemical reaction. There is energy that is required for the reaction to happen and there is energy that is absorbed and released during the reaction. But we can change the amount of energy that is required to make the reaction happen.
Day 5: the Salt Race
1. How did the energy change in each of the experiements we did last time?
2. What might influence the speed of a reaction?
Salt! Our Lab today looked at what it takes to disolve salt in water the quickest. The only rules were you had to use 50 grams of salt, at least 250 ml of water and your procedures must be detailed. You can crush the salt, use different temps of water or stir.
Day 6: Rates of Reaction
Starter Questions:
1. What type of reaction heats up and releases energy?
2. What type of reaction cools down and absorbs energy?
Today we are going to look at how the speed of a reaction can be inflenced.
Day 7: Walkaway
Starter Questions:
1. Name 3 of the 5 ways to change the rate the reaction.
2. Is a change of phase a chemical or physical change?
