Part 1: The image shows a density column, which is a collection of nine different liquids that have different enough densities that they form separate layers. The liquids, from least dense to most dense, are:
1. Dish soap
2. Rubbing alcohol
3. Milk
4. Corn syrup
5. Vegetable oil
6. Water
7. Honey
8. Maple syrup
9. Lamp oil
Part 2: The correct answer is Thumbtack = 1.9 g/mL.
Part 1:
The density column in the image is a great example of how density can be used to separate different liquids. Density is a measure of how much mass is contained in a given unit volume. It is calculated using the following equation:
Density = Mass / Volume
Liquids with a higher density have more mass per unit volume than liquids with a lower density. This is why the liquids in the density column are arranged in the order shown, with the least dense liquid at the top and the most dense liquid at the bottom.
The density column can be used to demonstrate a number of different scientific concepts, such as:
- Density is a characteristic property of matter.** This means that the density of a substance is always the same, regardless of the amount of substance present.
- Liquids of different densities will separate when they are mixed together.** This is because the liquids will naturally want to arrange themselves in order of increasing density.
- Density can be used to identify different liquids.** For example, if you have two unknown liquids and you know the density of one of them, you can use the density column to identify the other liquid.
Part 2:
The question asks which of the following items, if added to the density column, would settle and stay right in the green dyed water layer. The answer is a thumbtack, which has a density of 1.9 g/mL.
To determine which item would settle and stay right in the green dyed water layer, we need to compare the densities of the items to the density of the water. The density of water is 1.00 g/mL.
- Charcoal: 0.56 g/mL
- Glass: 1.40 g/mL
- Paperclip: 1.00 g/mL
- Thumbtack: 1.9 g/mL
Since the density of the thumbtack is greater than the density of the water, it will sink to the bottom of the density column and rest on the water layer. The other items have densities that are either less than or equal to the density of the water, so they will float on top of the water layer. Therefore, the answer to the question is thumbtack.