Changes In Solid And Liquid Materials

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| By Jasmin Del

Jasmin Del

Community Contributor

Quizzes Created: 1 | Total Attempts: 272

Questions: 7 | Attempts: 272 | Updated: Mar 22, 2023

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Questions and Answers

1.

Chopping vegetables
- A.
  
  Physical change
- B.
  
  Chemical change
Correct Answer
A. pHysical change

Explanation
Chopping vegetables is considered a physical change because it does not alter the chemical composition of the vegetables. The act of chopping simply breaks down the vegetables into smaller pieces, but the molecules and atoms remain the same. The change is reversible, as the chopped vegetables can be reassembled or cooked to their original state.

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2.

Melting ice cream
- A.
  
  Physical Change
- B.
  
  Chemical change
Correct Answer
A. pHysical Change

Explanation
Melting ice cream is a physical change because it involves a change in the state of matter from solid to liquid without any change in the chemical composition of the ice cream. The molecules in the ice cream are rearranged as heat is applied, causing the solid ice cream to melt into a liquid form. However, the chemical properties and composition of the ice cream remain the same throughout the process.

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3.

Souring milk
- A.
  
  Physical change
- B.
  
  Chemical change
Correct Answer
B. Chemical change

Explanation
Souring milk is a chemical change. When milk sours, it undergoes a process called fermentation, where bacteria break down the lactose (sugar) in milk into lactic acid. This chemical reaction causes the milk to change in taste, smell, and texture. The transformation of lactose into lactic acid is irreversible, making it a chemical change rather than a physical change.

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4.

Baking a cake
- A.
  
  Physical change
- B.
  
  Chemical change
Correct Answer
B. Chemical change

Explanation
Baking a cake involves a chemical change because the ingredients undergo a reaction to form a new substance. When the cake batter is mixed, the chemical reactions occur between the flour, eggs, sugar, and leavening agents. As the cake bakes, these reactions continue, causing the batter to rise and solidify into a cake. The heat from the oven also plays a crucial role in these chemical reactions, causing the proteins to denature and the starches to gelatinize. Overall, baking a cake is a chemical change because it involves the formation of new substances through chemical reactions.

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5.

Rusting keys
- A.
  
  Physical change
- B.
  
  Chemical change
Correct Answer
B. Chemical change

Explanation
Rusting of keys is a chemical change. Rusting occurs when iron reacts with oxygen in the presence of water or moisture, forming iron oxide (rust). This process involves a chemical reaction where the iron atoms are oxidized, leading to the formation of a new substance (iron oxide) with different properties than the original iron. As a result, the keys undergo a chemical transformation, making it a chemical change rather than a physical change.

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6.

Which describes physical change?
- A.
  
  It involves a chemical reaction.
- B.
  
  A new substance is formed.
- C.
  
  A change in state of matter occurs.
Correct Answer
C. A change in state of matter occurs.

Explanation
A change in state of matter occurs is the correct answer because physical change refers to a transformation in the physical properties of a substance without any alteration in its chemical composition. The other options, involving a chemical reaction and a new substance being formed, describe chemical changes where the composition of the substance is altered. However, a change in state of matter, such as solid to liquid or gas, is a physical change as it does not involve the formation of a new substance.

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7.

Which is an example of chemical change?
- A.
  
  While washing the dishes, Jam broke some plates.
- B.
  
  You forgot to put your leftover banana cake on the refrigerator. When you ate another slice, you notice that it's already spoiled.
- C.
  
  Carlo cut the logs for camp fire.
Correct Answer
B. You forgot to put your leftover banana cake on the refrigerator. When you ate another slice, you notice that it's already spoiled.

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Current Version
Mar 22, 2023

Quiz Edited by
ProProfs Editorial Team
Jun 22, 2020

Quiz Created by
Jasmin Del

Changes In Solid And Liquid Materials

Chopping vegetables

Melting ice cream

Souring milk

Baking a cake

Rusting keys

Which describes physical change?

Which is an example of chemical change?