QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Which of the following changes are chemical changes?
$\square$ Gasoline is evaporated.
$\square$ Water is heated up.
$\square$ Water is frozen.
$\square$ Gasoline is burned.
$\square$ Water is boiled.
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Answer
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Step 1:: Identify the state changes that involve a change in the physical state of the substance.
State changes, such as evaporation, heating, and freezing, are physical changes because they do not result in the formation of new substances. However, burning and boiling can be either physical or chemical changes depending on the context. In this case, we need to look at the specific substances involved.
Step 2:: Analyze the state changes that involve gasoline.
Gasoline is a hydrocarbon, a type of compound that consists of only hydrogen and carbon atoms. When gasoline is burned, it reacts with oxygen from the air to produce carbon dioxide and water, releasing energy in the form of heat and light. This is a chemical change because a new substance is formed.
Step 3:: Analyze the state change that involves boiling.
Boiling is the process of transforming a liquid into a gas due to a temperature increase. In general, boiling is a physical change. However, if a specific compound is mentioned, we should consider whether its boiling process involves a chemical change. In the case of water, boiling is a physical change because no new substances are formed.
Step 4:: Summarize the chemical changes.
Based on the analysis, there are two chemical changes in the list:
Step 5:
Gasoline is burned.
Step 6:
Water is boiled (if a specific compound is mentioned and its boiling process involves a chemical change). However, in this case, the boiling of water is not specified as a chemical change for that particular compound. Therefore, only one chemical change is present in the list.
Final Answer
The chemical change is "Gasoline is burned."
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