Chemical vs. Physical Change Explained
A chemical change results in the formation of new substances with different chemical properties. A physical change alters the form or appearance of a substance but does not change its chemical composition.
Analyzing the Options
Let's examine each option to determine if it's a chemical or physical change:
- Cooking an egg: Heat causes proteins in the egg to denature and change irreversibly, forming new chemical bonds. This is a chemical change.
- Melting an ice cube: Solid water (ice) changes into liquid water. The chemical formula (H2O) remains the same. Only the state changes. This is a physical change.
- Baking a cake: Ingredients undergo complex chemical reactions when heated, resulting in new substances with different textures and flavors. This is a chemical change.
- Rotting bananas: Decomposition by microorganisms involves chemical reactions that break down the banana's tissues and change its chemical makeup. This is a chemical change.
Conclusion
Based on the analysis, melting an ice cube is a physical change because it only alters the state of water without changing its chemical identity. The other options involve the formation of new substances.
Therefore, Melting an ice cube is not a chemical change.
Similar Questions
- What is oxidization?
- With which substance does silver react and turn black?
- Which of the following determines that a chemical reaction has not taken place?
- Which chemical process results in the formation of plaque on copper, the rusting of iron and the blackening of silver?
During an experiment, iron nails are placed in copper sulphate solution, and a reddish-brown deposit forms on the nails. What does this observation demonstrate about the type of chemical reaction and the substances involved?
In the reaction Na2SO4(aq) + BaCl2(aq) → BaSO4(*) + 2NaCl(aq), what will be the actual physical state that can replace (*)?
A student mixes aqueous solutions of barium chloride and sodium sulphate. A white curd-like substance forms instantly. What type of chemical reaction is primarily responsible for this observation?
In a laboratory, copper sulphate solution reacts with iron filings, causing a colour change and the deposition of a new metal. Which statement correctly explains the reason for this reaction?
- Which of the following solutions has the highest concentration of hydrogen ions?
- Which of the following product is formed due to burning of a magnesium ribbon with a spirit lamp?
Important Questions from Chemical Reaction
Which of the following statement is/are true?
I. In physical change new substance is formed. substance is formed.
II. In chemical change no new substance is formed.
Which of the following cells involves similar chemical reactions?
The information not obtained from balanced chemical equation is
Oxygen cannot be obtained by which one of the following methods?
Which of the following statement is correct?
I. Insoluble salt is obtained by precipitation reaction.
II. Addition of oxygen or loss of hydrogen is called oxidation.
