Chemical Reactions and Equations Sample Questions for Class 10
Question 1
The elements or compounds that enter into a chemical reaction are called .
A. catalysts
B. products
C. reactants
D. active sites
Question 2
A substance that accelerates the rate of a chemical reaction is called a(n)
A. catalyst.
B. lipid.
C. molecule.
D. element.
Question 3
Chemical reactions that absorb heat are called reactions.
A. homogeneous
B. heterogeneous
C. exothermic
D. endothermic
Question 4
In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
A. sucrose
B. carbon dioxide
C. heat
D. water
Question 5
Which of the following is NOT a type of chemical reaction?
A. decomposition
B. neutralization reaction
C. double displacement
D. synthesis