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Katie found a sample of an unknown solid. She performed a series of experiments to determine some of its properties. Her experiments are described in the chart below. Use the information to answer the following question.

experiment procedure
1 heat the sample and determine at which temperature it changes state.
2 expose the sample to an acid, a base, and water and observe the result.
3 measure the volume and mass of the sample and divide them.
4 place the sample in contact with oxygen gas and flame and observe the result.
Which of the following is correct about Katie's experiments?

(1 point)
Responses

Experiments 3 and 4 were designed to find physical properties.
Experiments 3 and 4 were designed to find physical properties.

Experiments 1 and 2 were designed to find physical properties
Experiments 1 and 2 were designed to find physical properties

Experiments 2 and 4 were designed to find chemical properties.
Experiments 2 and 4 were designed to find chemical properties.

Experiments 1 and 3 were designed to find chemical properties.
Experiments 1 and 3 were designed to find chemical properties.
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1 answer

To analyze the experiments Katie performed, we need to identify which ones are designed to determine physical properties and which are designed to determine chemical properties.

  1. Experiment 1: Heating the sample to determine the temperature at which it changes state (melting point, boiling point, etc.) is a measurement related to physical properties. This does not involve a change in the chemical composition of the substance.

  2. Experiment 2: Exposing the sample to an acid, a base, and water and observing the results evaluates how the substance reacts chemically with these substances. This involves changes in the chemical composition of the sample.

  3. Experiment 3: Measuring the volume and mass of the sample and dividing them would give the density of the sample, which is a physical property.

  4. Experiment 4: Placing the sample in contact with oxygen gas and flame and observing the result would involve a chemical reaction (combustion or oxidation), indicating it is designed to explore chemical properties as well.

Based on this analysis:

  • Experiments 1 and 3 were designed to find physical properties.
  • Experiments 2 and 4 were designed to find chemical properties.

Therefore, the correct response is:

Experiments 2 and 4 were designed to find chemical properties.