Question

You have a chemical in a sealed glass container filled with air. The setup is sitting on a balance as shown below. The chemical is ignited by means of a magnifying glass focusing sunlight on the reactant. After the chemical has completely burned, which of the following is true? Explain your answer. a. The balance will read less than $250.0 \mathrm{~g}$. b. The balance will read $250.0 \mathrm{~g}$. c. The balance will read greater than $250.0 \mathrm{~g}$. d. Cannot be determined without knowing the identity of the chemical.

Name: Problem 5, Chapter 2: Chemistry
Uploaded: 2019-09-04T02:18:59-08:00
Duration: 26 s
Channel: Ly Tran

   You have a chemical in a sealed glass container filled with air. The setup is sitting on a balance as shown below. The chemical is ignited by means of a magnifying glass focusing sunlight on the reactant. After the chemical has completely burned, which of the following is true? Explain your answer.
a. The balance will read less than $250.0 \mathrm{~g}$.
b. The balance will read $250.0 \mathrm{~g}$.
c. The balance will read greater than $250.0 \mathrm{~g}$.
d. Cannot be determined without knowing the identity of the chemical.

Chemistry

Steven S. Zumdahl,… 9th Edition

Chapter 2, Problem 5

Instant Answer

Solved by Expert Ly Tran

09/04/2019

Step 1

The chemical is in a sealed glass container, which means that no matter or gas can escape or enter the container during the reaction. Show more…

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You have a chemical in a sealed glass container filled with air. The setup is sitting on a balance as shown below. The chemical is ignited by means of a magnifying glass focusing sunlight on the reactant. After the chemical has completely burned, which of the following is true? Explain your answer. a. The balance will read less than $250.0 \mathrm{~g}$. b. The balance will read $250.0 \mathrm{~g}$. c. The balance will read greater than $250.0 \mathrm{~g}$. d. Cannot be determined without knowing the identity of the chemical.

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Key Concepts

Conservation of Mass

This principle states that in a closed system, the total mass remains constant over time even if matter is transformed from one form to another. In the context of the problem, although a chemical reaction occurs, no mass is lost or gained because the container is sealed, ensuring that the balance reading remains unchanged.

Closed System Dynamics

A closed system does not exchange matter with its surroundings, which means that all reactants and products remain inside the system despite any chemical reactions. This concept is crucial here because it explains that the overall mass, as registered by the balance, stays the same after the combustion reaction, since no gases or particles can escape.

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