CIE iGCSE Co-Ordinated Science C3.1 Formulas Exam Style Questions Paper 1
Question
Propene, C3H6, burns in excess oxygen to form carbon dioxide and water.
wC3H6 + xO2 yCO2 + zH2O
Which values of w, x, y and z balance this equation?
▶️Answer/Explanation
Ans :C
Question
Which equation is balanced?
A 2H2 + O2 → 2H2O2
B MgO + 2H2SO4 → MgSO4 + 2H2O
C Na + H2O → NaOH + H2
D Na2CO3 + 2HCl → 2NaCl + H2O + CO2
▶️Answer/Explanation
Ans :A
Question
Propanol, CH3CH2CH2OH, burns in oxygen to produce carbon dioxide and water.
2CH3CH2CH2OH + 9O2 → xCO2 + yH2O
Which values of x and y balance the equation?
▶️Answer/Explanation
Ans 😀
Question
There are three times as many hydrogen atoms as carbon atoms in one molecule of hydrocarbon X.
What is the formula of X?
(A) CH$_{4}$
(B) C$_{2}$H$_{4}$
(C) C$_{2}$H$_{6}$
(D) C$_{2}$H$_{5}$OH
▶️Answer/Explanation
Ans: C