Question

Part C Next, you’ll test the hardness of each rock by scratching it with different substances as shown in the chart. The values in the chart are based on the Mohs Scale of hardness, which ranks the hardness of rocks and minerals on a scale of 1 to 10. First try to scratch a rock with your fingernail. If you can make a mark on the rock with your fingernail, record the related hardness value from the chart in your table. If a fingernail doesn’t scratch the rock, try to scratch it with the copper penny. If the penny doesn’t scratch the rock, try the wire nail and finally the masonry nail. Enter a hardness value for each rock.

Answer 1

Answer + Explanation:

To determine the hardness value of each rock, you need to follow the instructions provided and test the rocks with different substances. Here is a step-by-step guide:

1. Start by scratching the rock with your fingernail. If your fingernail can make a mark on the rock, record the related hardness value from the chart in your table. For example, if your fingernail scratches the rock and the corresponding hardness value in the chart is 2, you would record 2 in your table.

2. If your fingernail doesn't scratch the rock, move on to the next substance, which is a copper penny. Try scratching the rock with the copper penny. If the penny doesn't scratch the rock, move on to the next substance.

3. The next substance to try is a wire nail. Scratch the rock with the wire nail. If the wire nail doesn't scratch the rock, proceed to the last substance.

4. The last substance to try is a masonry nail. Scratch the rock with the masonry nail. If the masonry nail doesn't scratch the rock, record the highest value from the chart in your table.

By following these steps and recording the highest hardness value achieved through the scratching test with each substance, you will be able to determine the hardness value of each rock.

hope this helps