Ch.1 - Introduction: Matter, Energy, and Measurement

Brown - Chemistry: The Central Science 15th Edition

Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970당신이 사용하는 게 아니라요?교과서 변경

Brown 15th Edition

Ch.1 - Introduction: Matter, Energy, and Measurement

문제 23b

1장, 문제 23b

Label each of the following as either a physical process or a chemical process: b. boiling a cup of water

검증된 단계별 안내

Identify the process described: boiling a cup of water.

Understand the definition of a physical process: a process that changes the physical properties of a substance without altering its chemical structure.

Analyze the process of boiling water: When water boils, it changes from liquid to gas (steam) at 100°C (212°F) under standard atmospheric pressure.

Determine if the chemical structure of water changes during boiling: The molecular structure of water (H2O) remains the same in both liquid and gas states.

Conclude whether the process is physical or chemical: Since boiling water only changes its state from liquid to gas without altering the molecular structure of H2O, it is a physical process.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Physical Process

A physical process involves changes in the state or appearance of a substance without altering its chemical composition. Examples include phase changes like melting, freezing, and boiling, where the substance retains its identity despite changes in form.

Chemical Process

A chemical process involves a transformation that changes the chemical composition of a substance, resulting in the formation of new substances. This can include reactions such as combustion, oxidation, and synthesis, where the original materials are fundamentally altered.

Boiling Point

The boiling point is the temperature at which a liquid's vapor pressure equals the external pressure surrounding it, causing the liquid to change into vapor. For water, this occurs at 100°C (212°F) at standard atmospheric pressure, marking the transition from liquid to gas without changing its chemical structure.

관련 실천

교과서 질문

For each of the following processes, would filtration, distillation, or chromatography be the most effective separation technique:

a. removing the pulp from freshly squeezed orange juice,

b. separating a food dye into its individual components,

c. desalinating seawater?

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교과서 질문

(b) Which properties of zinc can you describe from the photo? Are these physical or chemical properties?

511

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교과서 질문

In the process of attempting to characterize a substance, a chemist makes the following observations: The substance is a silvery white, lustrous metal. It melts at 649 °C and boils at 1105 °C. Its density at 20 °C is 1.738 g/cm³. The substance burns in air, producing an intense white light. It reacts with chlorine to give a brittle white solid. The substance can be pounded into thin sheets or drawn into wires. It is a good conductor of electricity. Which of these characteristics are physical properties, and which are chemical properties?

Label each of the following as either a physical process or a chemical process: c. pulverizing an aspirin

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교과서 질문

A match is lit and held under a cold piece of metal. The following observations are made: (a) The match burns. (b) The metal gets warmer. (c) Water condenses on the metal. (d) Soot (carbon) is deposited on the metal. Which of these occurrences are due to physical changes, and which are due to chemical changes?

871

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교과서 질문

(a) Read the following description of the element zinc and indicate which are physical properties and which are chemical properties. Zinc melts at 420 °C. When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves. Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm³ at 25 °C. It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.

866

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