Domanda del libro di testo
Pure acetic acid, which gives the sour taste to vinegar, has a melting point of 16.7 ° C and a boiling point of 118 ° C . Predict the physical state of acetic acid when the ambient temperature is 10 ° C .
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3. Matter and Energy
Physical Properties
0:48 minutiProblema 10
Domanda del libro di testo
Describe each of the following as a physical or chemical property: b. Apple slices turn brown when they are exposed to air.
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Understand the difference between physical and chemical properties. A physical property can be observed without changing the substance's chemical identity, while a chemical property describes the ability of a substance to undergo a specific chemical change.
Consider the process described: apple slices turning brown when exposed to air. This involves a change in the apple's appearance.
Determine if the change involves a chemical reaction. In this case, the browning of apple slices is due to a chemical reaction called oxidation, where enzymes in the apple react with oxygen in the air.
Since the browning involves a chemical reaction, it indicates a change in the chemical composition of the apple.
Conclude that the browning of apple slices when exposed to air is a chemical property, as it involves a chemical change.
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Physical Property
A physical property is a characteristic of a substance that can be observed or measured without changing its chemical composition. Examples include color, odor, melting point, and density. Physical properties are often used to identify substances and can be observed through physical changes, such as phase transitions.
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02:54
Physical Properties Concept
Chemical Property
A chemical property describes a substance's ability to undergo a specific chemical change or reaction. This includes properties such as reactivity with other chemicals, flammability, and acidity. When a chemical property is observed, the substance's chemical structure is altered, resulting in the formation of new substances.
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02:17Chemical Properties Example 1
Oxidation Reaction
The browning of apple slices when exposed to air is primarily due to an oxidation reaction. This process occurs when enzymes in the apple react with oxygen, leading to the formation of melanin, which causes the brown color. Understanding oxidation is crucial for recognizing how certain substances change when exposed to environmental factors.
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02:42Calculate Oxidation Numbers
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