Classify each change as physical or chemical. MISSED THIS?...

Name: Problem 47, Chapter 1: Chemistry A Molecular Approach
Uploaded: 2021-04-27T14:59:19-08:00
Duration: 1 min 10 s
Channel: Nicole Smina
Description: Classify each change as physical or chemical. MISSED THIS? Read Section 1.4 a. Natural gas burns in a stove. b. The liquid propane in a gas grill evaporates because the valve was left open. c. The liquid propane in a gas grill burns in a flame. d. A bicycle frame rusts on repeated exposure to air and water.

Classify each change as physical or chemical. MISSED THIS? Read Section 1.4 a. Natural gas burns in a stove. b. The liquid propane in a gas grill evaporates because the valve was left open. c. The liquid propane in a gas grill burns in a flame. d. A bicycle frame rusts on repeated exposure to air and water.

Classify each change as physical or chemical. MISSED THIS? Read Section 1.4
a. Natural gas burns in a stove.
b. The liquid propane in a gas grill evaporates because the valve was left open.
c. The liquid propane in a gas grill burns in a flame.
d. A bicycle frame rusts on repeated exposure to air and water.

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Key Concepts

Physical Change

A physical change involves a transformation in the state or appearance of a substance without altering its chemical identity. Processes such as changes in state (e.g., evaporation, melting, or freezing) fall under this category since the molecules remain intact and can revert back to their original form.

Chemical Change

A chemical change, or chemical reaction, occurs when substances combine or break apart to form new substances with different chemical properties. This type of change involves the breaking and forming of chemical bonds, resulting in transformations like burning, rusting, or any process that yields new compounds.

Combustion

Combustion is a specific type of chemical reaction that typically involves a substance reacting with oxygen to release heat and light. It exemplifies a chemical change, as the original substances are transformed into different products, such as oxides.

Oxidation

Oxidation is a chemical process in which a material, often a metal, reacts with oxygen, leading to the formation of oxides. This reaction, which can occur slowly as seen in rusting, fundamentally alters the substance at the molecular level, and is a clear example of a chemical change.

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