If an upward arrow (↑) is written next to a product in a chemical equation, what does it indicate?
Answer and explanation
Correct answer: A gas is evolving
In the conventional notation used in school chemical equations, an upward arrow (↑) beside a product indicates that a gas is evolved during the reaction. For example, acid reacting with a carbonate may produce carbon dioxide gas, shown with this symbol. A downward arrow (↓), not an upward arrow, is commonly used to indicate an insoluble precipitate. The symbols do not directly represent heat absorption or dissolution.
Frequently asked questions
What is the correct answer to this question?
A gas is evolving
Why is this the correct answer?
In the conventional notation used in school chemical equations, an upward arrow (↑) beside a product indicates that a gas is evolved during the reaction. For example, acid reacting with a carbonate may produce carbon dioxide gas, shown with this symbol. A downward arrow (↓), not an upward arrow, is commonly used to indicate an insoluble precipitate. The symbols do not directly represent heat absorption or dissolution.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
