IGCSE O Level Chemistry Practice Test 149

Endothermic Reactions Quiz Questions and Answers PDF - 149

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The Quiz: Endothermic reactions take place when; "Endothermic Reactions" App Download (Free) with answers energy given out in making bonds is more than the energy taken in for breaking bonds, energy given out in making bonds is less than the energy taken in for breaking bonds, energy given out in making bonds is equal to the energy taken in for breaking bonds to study online IGCSE courses. Solve energy from chemicals questions and answers, Amazon eBook to download free sample for free online college classes.

Endothermic Reactions Questions and Answers PDF Download: Quiz 149

MCQ 741: Endothermic reactions take place when

A) energy given out in making bonds is less than the energy taken in for breaking bonds

B) energy given out in making bonds is more than the energy taken in for breaking bonds

C) energy given out in making bonds is equal to the energy taken in for breaking bonds

D) none of above

MCQ 742: Paraffin is an example of

A) strong electrolyte

B) non-electrolyte

C) weak electrolyte

D) catalyst

MCQ 743: The chemical formula of aluminum nitrate is

A) AlNi₃

B) Al₃Ni₂

C) Al(NO₂)₃

D) Al(NO₃)₃

MCQ 744: In the electrolysis of aqueous solutions of dilute acids or dilute alkalis, the amount of hydrogen given off is roughly

A) half of the oxygen given off at the anode

B) same as of oxygen given off at anode

C) twice the oxygen given off at anode

D) twice the oxygen given off at cathode

MCQ 745: Mass of an element in a compound can be calculated through

A) Ar of the atoms/Mr of the compound

B) Mr of the atoms/Ar of the compound

C) (Ar of the atoms/Mr of the compound) × mass of sample

D) (Ar of the atoms/Mr of the compound) × mass of sample

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