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Physical and Chemical Changes Say you are presented with two beakers, beaker A and beaker B, each containing a white, powdery compound. a From your initial observations, you suspect that the two beakers contain the same compound. Describe, in general terms, some experiments in a laboratory that you could do to help prove or disprove that the beakers contain the same compound. b Would it be easier to prove that the compounds are the same or to prove that they are different? Explain your reasoning. c Which of the experiments that you listed above are the most convincing in determining whether the compounds are the same? Justify your answer. d A friend states that the best experiment for determining whether the compounds are the same is to see if they both dissolve in water. He proceeds to take 10.0 g of each compound and places them in separate beakers, each containing 100 mL of water. Both compounds completely dissolve. He then states, “Since the same amount of both substances dissolved in the same volume of water, they must both have the same chemical composition.” Is he justified in making this claim? Why or why not?

BuyFind

General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343
BuyFind

General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

Solutions

Chapter
Section
Chapter 1, Problem 1.23QP
Textbook Problem

Physical and Chemical Changes

Say you are presented with two beakers, beaker A and beaker B, each containing a white, powdery compound.

  1. a From your initial observations, you suspect that the two beakers contain the same compound. Describe, in general terms, some experiments in a laboratory that you could do to help prove or disprove that the beakers contain the same compound.
  2. b Would it be easier to prove that the compounds are the same or to prove that they are different? Explain your reasoning.
  3. c Which of the experiments that you listed above are the most convincing in determining whether the compounds are the same? Justify your answer.
  4. d A friend states that the best experiment for determining whether the compounds are the same is to see if they both dissolve in water. He proceeds to take 10.0 g of each compound and places them in separate beakers, each containing 100 mL of water. Both compounds completely dissolve. He then states, “Since the same amount of both substances dissolved in the same volume of water, they must both have the same chemical composition.” Is he justified in making this claim? Why or why not?

Expert Solution

(a)

Interpretation Introduction

Interpretation:

How some experiments in laboratory help to prove or disprove that the beaker contains same compound has to be described.

Concept Introduction:

Matter exists in different forms in different conditions as solids, liquids and gases. The characteristic identification of solids is their rigidity and they tend to maintain their shapes, when the outside forces are subjected to them. Both liquids and gases are fluids, they change their shapes when they subjected to the outside forces.

Physical Change:

A change in the form of matter but not in its chemical identity is called “physical change”. Changes in the physical state are the example of physical change.

Chemical Change:

A change in which one or more kinds of matter are transformed into a new or several kinds of matter are called “chemical reaction or chemical change”. For example, iron combine with oxygen it forms a new material called “rust” and this change is known as “rusting of iron”.

Explanation of Solution

The physical appearance of the compounds in both beakers has to be checked first.  The consistency and hardness of the particles in both beakers has to be checked.  Along with this we can check the smell of both compounds present in the beaker...

Expert Solution

(b)

Interpretation Introduction

Interpretation:

Which will be easier to prove that the compound are same or different has to be given.

Concept Introduction:

Matter exists in different forms in different conditions as solids, liquids and gases. The characteristic identification of solids is their rigidity and they tend to maintain their shapes, when the outside forces are subjected to them. Both liquids and gases are fluids, they change their shapes when they subjected to the outside forces.

Physical Change:

A change in the form of matter but not in its chemical identity is called “physical change”. Changes in the physical state are the example of physical change.

Chemical Change:

A change in which one or more kinds of matter are transformed into a new or several kinds of matter are called “chemical reaction or chemical change”. For example, iron combine with oxygen it forms a new material called “rust” and this change is known as “rusting of iron”.

Expert Solution

(c)

Interpretation Introduction

Interpretation:

Among the experiments that are listed which one is more convincing has to be explained.

Concept Introduction:

Matter exists in different forms in different conditions as solids, liquids and gases. The characteristic identification of solids is their rigidity and they tend to maintain their shapes, when the outside forces are subjected to them. Both liquids and gases are fluids, they change their shapes when they subjected to the outside forces.

Physical Change:

A change in the form of matter but not in its chemical identity is called “physical change”. Changes in the physical state are the example of physical change.

Chemical Change:

A change in which one or more kinds of matter are transformed into a new or several kinds of matter are called “chemical reaction or chemical change”. For example, iron combine with oxygen it forms a new material called “rust” and this change is known as “rusting of iron”.

Expert Solution

(d)

Interpretation Introduction

Interpretation:

The explanation given by a friend claiming the two compounds to be the same has to be justified.

Concept Introduction:

Matter exists in different forms in different conditions as solids, liquids and gases. The characteristic identification of solids is their rigidity and they tend to maintain their shapes, when the outside forces are subjected to them. Both liquids and gases are fluids, they change their shapes when they subjected to the outside forces.

Physical Change:

A change in the form of matter but not in its chemical identity is called “physical change”. Changes in the physical state are the example of physical change.

Chemical Change:

A change in which one or more kinds of matter are transformed into a new or several kinds of matter are called “chemical reaction or chemical change”. For example, iron combine with oxygen it forms a new material called “rust” and this change is known as “rusting of iron”.

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Chapter 1 Solutions

General Chemistry - Standalone book (MindTap Course List)
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