Waec Chemistry 2021 Past Questions and Answers

Question 46:

• WAEC 2021

The region around the nucleus where electrons can be located is called?

A. A spectra
B. An orbital
C. A quanta
D. A field

Question 47:

• WAEC 2021

Protons and electrons are called fundamental particles because they ____________

A. Are indivisible
B. Have different charges
C. Are the lightest particles
D. Are found in all matter

Question 48:

• WAEC 2021

Consider the following energy profile diagram and use it to answer the question that follows



The activation energy of the reaction is

A. E\(_{A}\)
B. E\(_{B}\)
C. E\(_{C}\)
D. E\(_{D}\)

Question 49:

• WAEC 2021

Consider the following energy profile diagram and use it to answer the question that follows



The enthalpy change of the reaction is ____________

A. E\(_{A}\)
B. E\(_{B}\)
C. E\(_{C}\)
D. E\(_{D}\)

Question 50:

• WAEC 2021

Consider the following energy profile diagram and use it to answer the question that follows



The energy profile diagram illustrates ____________

A. An endothermic reaction
B. An exothermic reaction
C. A spontaneous reaction
D. A redox reaction