Problem 109 Which of the following demonstra... [FREE SOLUTION] (2024)

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Chapter 2: Problem 109

Which of the following demonstrates a change in physical properties? A. wood burning in a campfire B. a banana turning brown C. a steak cooking in a frying pan D. a glass being shattered by a flying dart

Short Answer

Expert verified

Option D: a glass being shattered by a flying dart demonstrates a change in physical properties.

Step by step solution

Understanding Physical and Chemical Changes

Physical changes affect the form of a chemical substance, but not its chemical composition. Chemical changes occur when a substance combines with another to form a new substance or decomposes into two or more different substances.

Analyze Option A: Wood Burning in a Campfire

Wood burning involves combustion, a chemical reaction where wood combines with oxygen to form carbon dioxide, water, and ash. This is a chemical change.

Analyze Option B: A Banana Turning Brown

A banana turning brown involves enzymatic browning, a chemical reaction where oxygen reacts with phenolic compounds in the banana. This is a chemical change.

Analyze Option C: A Steak Cooking in a Frying Pan

Cooking a steak involves chemical reactions such as the Maillard reaction, where amino acids and reducing sugars react to form new molecules, changing the steak's flavor and color. This is a chemical change.

Analyze Option D: A Glass Being Shattered by a Flying Dart

Shattering glass involves breaking the glass into smaller pieces without changing its chemical composition. This is a physical change.

Conclusion

The change that demonstrates a physical property is the glass being shattered. Unlike the other options, shattering glass does not involve a change in chemical composition.

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

headline of the respective core concept

Physical changes involve changes in the physical properties of a substance, like size, shape, or state, without altering its chemical composition.
Glass shattering is a classic example of a physical change. When a glass is shattered by a dart, its chemical makeup remains the same; it just breaks into smaller pieces.
Other examples include ice melting (change from solid to liquid) or dissolving sugar in water (sugar remains sugar, just dispersed in water).
During a physical change:

The identity of the substance does not change.
The change can often be reversed (e.g., water freezing and melting).
No new substances are formed.

Understanding this is crucial for distinguishing between physical and chemical changes.

headline of the respective core concept

Chemical changes involve a process where one or more substances combine or break apart to form new substances.
For example, wood burning in a campfire is a chemical change. During combustion, wood reacts with oxygen to produce carbon dioxide, water vapor, and ash.
Another example is a banana turning brown. This change is due to enzymatic browning — a reaction between oxygen and phenolic compounds in the banana which produces new brown pigments.
Key characteristics of chemical changes include:

Formation of new substances with different properties.
Energy changes often occur (release or absorption of heat).
Changes are usually not easily reversible.

Recognizing chemical changes is essential for understanding chemical reactions and processes.

headline of the respective core concept

Chemical reactions are processes that lead to the transformation of one set of substances (reactants) into another set of substances (products).
When cooking a steak in a frying pan, multiple chemical reactions occur, such as the Maillard reaction. This reaction involves amino acids and sugars combining and creating new flavor and color compounds.
Chemical reactions can be identified by:

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Most popular questions from this chapter

A pitcher requires about \(0.2\) second to throw a baseball. If the ball leaveshis hand with a velocity of \(80 \mathrm{~m} / \mathrm{s}\), what is itsacceleration? A. \(40 \mathrm{~m} / \mathrm{s}^2\) B. \(400 \mathrm{~m} / \mathrm{s}^2\) C. \(40 \mathrm{~m} / \mathrm{s}\) D. \(4 \mathrm{~m} / \mathrm{s}\)Four liquids have densities as follows: Liquid W: \(1.5\) \(\mathrm{g} /\mathrm{mL}\); Liquid X: \(12 \mathrm{~g} / \mathrm{mL}\); Liquid Y: \(0.8\mathrm{~g} / \mathrm{mL}\); Liquid \(\mathrm{Z}\) : \(2.8 \mathrm{~g} /\mathrm{mL}\). When poured into a container, what is the correct arrangement ofthese liquids from the bottom of the container to the top? A. \(Y, W, Z, X\) B. \(X, Z, W, Y\) C. \(X, W, Z, Y\)Read the following facts: Fact 1: When sunlight is absorbed by an object, the object becomes warmer. Fact 2: Dark-colored objects absorb more sunlight than light-colored objects. On a hot, sunny day, how can you keep coolest? A. by wearing dark-colored clothes and staying out of direct sunlight B. by wearing light-colored clothes and staying in direct sunlight C. by wearing dark-colored clothes and staying in direct sunlight D. by wearing light-colored clothes and staying out of direct sunlightUse your understanding of work and power to answer the following question. Twoteammates, Randy and Aaron, are in the weight-lifting room. Randy lifts the100-pound barbell over his head 10 times in 5 minutes; Aaron lifts the same100-pound barbell over his head 10 times in 3 minutes. Which teammate deliversthe most power?An isotope of argon (atomic number \(=18\) ) has a mass number of 40 . How manyneutrons are in this isotope? A. 18 B. 40 C. 22 D. 58

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Problem 109 Which of the following demonstra... [FREE SOLUTION] (2024)

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