Give a test that can be used to differentiate chemically between butter and cooking oil.

Explanation

To differentiate chemically between butter and cooking oil, we can use the bromine water test. Here’s a step-by-step solution:

### Step 1: Gather Materials
- You will need two test tubes.
- Obtain samples of butter and cooking oil.
- Get some bromine water.

### Step 2: Prepare the Test Tubes
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