What conclusions can you draw about the identity of the unknowns? Write an evidence-based claim. Type your answer here: the block were the same height and weight. They aren’t the same height and weight. 2. Evaluate the procedure used in this experiment by considering the properties used to identify the unknowns and the number of knowns that were tested. Revise the experimental design by proposing ways to modify the experiment to increase your certainty in the identity of the unknowns. Type your answer here: well first off, the first block(silver) weighed 35.4 the second one (tungsten) weighed 65.1 the third one(platinum) weighed 72.4. for the next set of blocks the first one(unknown) weighed 112.6. the second blocked(unknown) weighed 111.7. the third block weighed 2.7. to find all that out we could’ve estimated and it or compare it to something as heavy and the same size.
The Correct Answer and Explanation is:
1. Evidence-Based Claim:
The identity of the unknown blocks can be inferred based on their weight and comparison to known materials of the same size. Since the unknown blocks had significantly different weights despite appearing the same size, their identities are likely different from each other and from the known blocks. Specifically, the unknown blocks weighing 112.6 g and 111.7 g are most similar in mass to each other and much heavier than silver (35.4 g), tungsten (65.1 g), and platinum (72.4 g), suggesting that these unknowns are made from a denser material than any of the tested knowns.
2. Evaluation and Revised Experimental Design:
The procedure in this experiment relied on comparing the weight and size of blocks to determine their identities. This is a reasonable start, but using only mass and assuming all blocks are the same size is not sufficient to identify the materials with certainty. There were only three known substances tested, which limits the accuracy of comparison when trying to identify unknowns, especially if the unknowns are made of materials not represented in the known samples.
To improve the experiment, several modifications should be made. First, measure the volume of each block rather than assuming they are the same size. This allows calculation of density using the formula density equals mass divided by volume. Density is a more reliable property for identifying materials. Second, test a larger variety of known substances, including materials with densities closer to those of the unknowns. This increases the likelihood of matching the unknowns to a known material. Third, ensure precise measurements using calibrated equipment for both mass and volume. Finally, repeat the experiment with multiple trials to confirm consistency in the data. These steps will greatly improve the reliability of identifying the unknown materials and reduce uncertainty in the results.
