True-False

Question 11 Mark

These are some chemical reactions which shows more than one characteristics of chemical reaction. [True/ False]

Answer

True.
Explanation:
The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.

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Question 21 Mark

Rancidity can be slowed down by storing foods away from light. [True/ False]

Answer

True.
Explanation:
Rancidity can be prevented by storing food in air tight containers because in airtight containers there is little exposure to oxygen then oxidation of fats and oils present in food is slowed down and thus rancidity is retarded.

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Question 31 Mark

A precipate is a liquid product which seperates the solution during a chemical reaction. [True/ False]

Answer

True.
Explanation:
Precipitation is the creation of a solid from a solution. When the reaction occurs in a liquid solution, the solid formed is called the 'precipitate'.

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Question 41 Mark

State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.

Answer

False.

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Question 51 Mark

A solution made in water is indicated by the symbol. [True/ False]

Answer

True.
Explanation:
The symbol (aq) represents aqueous solution. When it is written after a chemical formula in a chemical equation, it represents that the element or compound is a aqueous solution i.e water is added into the solution.

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Question 61 Mark

Respiration is an endothermic process. [True/ False]

Answer

False.
Explanation:
Respiration is an exothermic process because it forms the highly stable.

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