Classifying Chemical Reactions Lab

SCH3U

Lab Activity:

Classifying Synthesis, Decomposition, Single Displacement and Double Displacement Reactions

Name:______

Partner’s Name:______

Date Performed:______

Date Due:)______/1C title block

Purpose:

The purpose of this lab activity is to perform different types of chemical reactions, todescribe and identify the products of each reaction, and to write the balanced chemical equations for each reaction.

Materials:

Materials and instructions will be provided for you at each station. You MUST wear goggles at all times. Safety first!

Procedure:

1. This lab is divided into stations. Follow the instructions at each station carefully.
2. The reactants are written on the station cards. Record the reactants for each reaction in Table 1.
3. Record all observations for each reaction in Table 1.

Include any physical observations (colour, clarity and state) and observations that suggest a chemical reaction has occurred (gas formation, temperature change, colour change).

SCH3U

Table 1: /1 C title

Analysis

1. For each reaction, write the balanced chemical equation including the states.

Discussion Questions

1. Which reaction(s) showed a synthesis reaction? Use your observations to explain how you know this type of reaction occurred.

2. Which reaction(s) showed a decomposition reaction? Use your observations to explain how you know this type of reaction occurred.

3. Which reaction(s) showed a single displacement reaction? Use your observations to explain how you know this type of reaction occurred.

4. Which reaction(s) showed a double displacement reaction? Use your observations to explain how you know this type of reaction occurred.

/6 I reaction type/12 I explanations

STATION A

Reactant:

Copper(II)sulfate pentahydrate (CuSO4 5H2O)

Procedure:

1. Record the reactant in your table.
2. Place a piece of copper(II)sulfate pentahydrate in a dry test tube in a wooden test tube rack. Do not use a plastic test tube rack because it might melt when the test tube gets hot!!!
3. Have a test tube holder ready to use.
4. Follow the ‘How to Light a Bunsen Burner’ instructions carefully and adjust the Bunsen burner until you have a blue flame.
5. Pointing the test tube away from others, heat the copper(II) sulfate in the test tube until you see a change in its appearance. (1-2 minutes).
6. Let the hot test tube cool in the wooden test tube rack. You will need the product for Station B.
7. Record your observations.

STATION B

Reactant:

Copper(II)sulfate (CuSO4)

Water

Procedure:

1. Record the reactants in your table.
2. Add a few drops of water the product from your reaction in 1A.
3. Record your observations.
4. Dump the products into the blue waste beaker.

STATION C

Reactants:

3 mol/L hydrochloric acid (HCl)  This acid will burn your skin. Wash your hands immediately if you spill any.

Mossy zinc metal

Procedure:

1. Record the reactants in your table.
2. In the test tube place about 2 cm of hydrochloric acid.
3. Use a scoopula to add a small amount of zinc to the test tube.
4. Record your observations.
5. Pour the product into the waste beaker.
6. Wash the test tube.

STATION D

Reactants:

Iron nail

copper (II) sulfate

Procedure:

1. Record the reactants in your table.

1. Use sandpaper to clean the iron nail before you begin.
2. Place the clean nail in a test tube and cover it with copper(II)sulfate solution.
3. After several minutes, pour off the liquid into the waste beaker.
4. Dump the nail onto a paper towel and examine the nail.
5. Record your observations.

STATION E

Reactants:

?

?

Procedure:

1. Use your solubility table to figure out which of the two reactants provided will result in a double displacement reaction with a precipitate.
2. Add a few drops of each reactant to the test tube.
3. Record your observations. (use the centrifuge if necessary)
4. Pour the products into the waste beaker.
5. Wash your test tubes.

STATION F

Reactant:

Copper metal + oxygen 

*There is more than one possible product for this reaction! Use Google to figure out which one you saw.

Procedure:

1. Record the reactants in your table
2. Sand down the copper metal until it is shiny
3. Heat the copper in a Bunsen burner flame until you see a colour change
4. Record your observations

1. For reaction A and B:

a)What colour is the CuSO4 ∙5 H2O ? (1 mark, I)

b)What colour is the CuSO4?(1 mark, I)

c)How are these two reactions related? (1 mark, I)

1. For reaction C:

a)What gas was formed in this reaction?(1 mark, I)

b)What gas test would you use to confirm that this gas was formed? Explain. (2 marks, I)

1. For reaction D:

a)What gas was formed in this reaction? (1 mark, I)

b)Name twoother metals you could add to HCl to produce the same type of gas? (2 marks, I)

Hint: Use your Metal Activity Series

1. For reaction E and G:

a)What did you see form when the reactants were combined? (1 mark, I)

b) Name a different compound you could add to copper(II)chloride to form a precipitate. (2 marks, I)

Hint: Use your Solubility Table

1. For reaction F:

a)What happened to the nail? Explain why this happened. (1 mark, I)

1. For reaction H:

a)There is more than one possible product for this reaction. Name 2 possible product. (1 mark, I)

b)Explain how you would know which one formed in the reaction. (1 mark,I)

STATION X

TEACHER DEMO

Reactant:

hydrogen peroxide ( H2O2 ) <- Be very careful when pouring!

Wash hands immediately if you spill any!

Catalyst:

Potassium Iodide

*The catalyst is a substance that does not get used up in the reaction. It is not one of the reactants, it just helps make the reaction go faster.

When writing the chemical equation, write the catalyst above the arrow.*

Procedure:

1. Record the reactant in your table.
2. Fill a small graduated cylinder with 5 mL of hydrogen peroxide.
3. In a large graduated cylinder put 2 drops of dish soap and use a scoopula to add a few crystals of potassium iodide.
4. Add the hydrogen peroxide to the large graduated cylinder and record your observations.
5. The products can be washed down the sink with lots of water.

8. Wash the graduated cylinders.

STATION X

Reactants:

calcium metal * Be very careful !! This metal is REACTIVE!!!!!

water

Procedure:

1. Record the reactants in your table.
2. Fill a beaker half full with water.
3. Using the tweezers or a scoopula add a small piece of calcium metal to the water in the beaker
4. Describe the reaction that is occurring in your table.
5. Dispose of the calcium and liquid in the waste beaker.
6. Wash the test tube.

STATION X

Reactants:

sodium hydroxide

copper(II)sulfate

Procedure:

1. Record the reactants in your table.
2. In the test tube place about 2 cm of sodium hydroxide.
3. Add a few drops of copper(II)sulfate to the test tube.
4. Record your observations (use the centrifuge if needed)
5. Pour the products in the waste beaker.
6. Wash the test tubes.

Revised Spring 2014